Hierarchically structured 3D carbon nanotube electrodes for electrocatalytic applications

• Pei Wang,
• Katarzyna Kulp and
• Michael Bron

Beilstein J. Nanotechnol. 2019, 10, 1475–1487, doi:10.3762/bjnano.10.146

• ][5][6][7][8]. Besides the above-mentioned applications, CNTs have also been investigated as catalysts or catalyst supports for various electrocatalytic reactions [8][9][10][11][12][13], including methanol oxidation in direct methanol fuel cells (DMFCs). DMFCs are promising power sources for future

• to solve these issues are focused on the optimization of the catalyst, such as alloying Pt with a second metal such as Ni, Ru and Pd [20][21][22][23][24] or using Pt-metal oxide composites such as Pt/SnO2 and Pt/CeO2 [24][25][26][27][28]. Additionally, a variety of catalyst preparation methods, e.g

• ., colloidal synthesis [29][30][31], a galvanic replacement process [32][33][34][35] or microwave-assisted preparation [20][21][36], have been proposed to gain control over the structural features of the active nanoparticles. However, from heterogeneous catalysis it is generally known that a suitable catalyst

BiOCl/TiO₂/diatomite composites with enhanced visible-light photocatalytic activity for the degradation of rhodamine B

• Minlin Ao,
• Kun Liu,
• Xuekun Tang,
• Zishun Li,
• Qian Peng and
• Jing Huang

Beilstein J. Nanotechnol. 2019, 10, 1412–1422, doi:10.3762/bjnano.10.139

• the target degradation product. In addition, the photocatalytic mechanism was further analyzed by investigating the structure and photochemical properties of the catalyst. Experimental Materials Tetrabutyl titanate, ethanol, acetic acid, nitric acid, bismuth nitrate pentahydrate (Bi(NO3)3·5H2O

• temperature of TiO2 in the composites. This speculation is based on previous reports that some modification methods may lead to crystal transformation and grain size change [27][32]. The photocatalytic activity of the catalyst is related to its specific surface area. Generally, the larger the specific surface

• species [41]. The generation of particular active species in the photocatalytic process varies with the type of catalyst (mainly the energy band structure) [42]. KI, IPA and 1,4-benzoquinone (BQ) were used as scavengers for pores (h+), hydroxyl radicals (OH) and superoxide radicals (O2−), respectively, to

Warped graphitic layers generated by oxidation of fullerene extraction residue and its oxygen reduction catalytic activity

• Machiko Takigami,
• Rieko Kobayashi,
• Takafumi Ishii,
• Yasuo Imashiro and
• Jun-ichi Ozaki

Beilstein J. Nanotechnol. 2019, 10, 1391–1400, doi:10.3762/bjnano.10.137

• Abstract Carbon-based oxygen reduction reaction (ORR) catalysts are regarded as a promising candidate to replace the currently used Pt catalyst in polymer electrolyte fuel cells (PEFCs); however, the active sites remain under discussion. We predicted that warped graphitic layers (WGLs) are responsible for

• ]. Improving an ORR catalyst by altering the catalyst design and preparation successfully led to the world's first commercialization of a portable fuel cell with a non-precious-metal catalyst [37][38]. Building on this success, we ultimately aim to apply our CACs to automobile and stationary device uses. These

• activity. Banham et al. studied the degradation of non-precious-metal catalysts and a carbon alloy catalyst [38]. They claim that carbon oxidation (attacked by H2O2) is the primary mechanism for performance loss during cell operation. Hence, this conclusion justifies the degrading effect of the specific

Highly ordered mesoporous silica film nanocomposites containing gold nanoparticles for the catalytic reduction of 4-nitrophenol

• Mohamad Azani Jalani,
• Leny Yuliati,
• Siew Ling Lee and
• Hendrik O. Lintang

Beilstein J. Nanotechnol. 2019, 10, 1368–1379, doi:10.3762/bjnano.10.135

• . Such catalytic activity is due to the presence of gold nanoparticles of smaller size in the silicate channels of the highly ordered mesoporous film nanocomposites. Keywords: catalyst; gold nanoparticle; mesoporous silica; nanocomposite; thermal hydrogen reduction; 4-nitrophenol reduction

• and centrifugation in order to retrieve the catalysts. Hence, we highlight the utilization of thin film nanocomposites [AuNPs]red/silicahex as a heterogeneous catalyst for the reduction of 4-NP to 4-aminophenol (4-AP), where a thin film was simply dipped into the reaction system containing an excess

• other reports, the AuNP–film catalyst in this work showed higher catalytic activity for the reduction of 4-NP to 4-AP which was 10 times (0.199 × 10−2 min−1) and 4 times (0.45 × 10−2 min−1) higher than for AuNPs prepared from Gnida glauca leaf and stem extracts [45]. Another report by Shende et al. [46

Alloyed Pt₃M (M = Co, Ni) nanoparticles supported on S- and N-doped carbon nanotubes for the oxygen reduction reaction

• Stéphane Louisia,
• Yohann R. J. Thomas,
• Pierre Lecante,
• Marie Heitzmann,
• M. Rosa Axet,
• Pierre-André Jacques and
• Philippe Serp

Beilstein J. Nanotechnol. 2019, 10, 1251–1269, doi:10.3762/bjnano.10.125

• reaction (ORR) have been evaluated in a rotating ring disk electrode experiment. The Pt3M/N-CNT catalysts revealed excellent electrochemical properties compared to a commercial Pt3Co/Vulcan XC-72 catalyst. The nature of the carbon support plays a key role in determining the properties of the metal

• contains generally four times more catalyst than the anodic layer, which explains why most of the research is focused on the optimization of the cathodic catalytic layer. Platinum nanoparticles (NPs) supported on carbon black (CB), especially Vulcan XC-72 [3][4], are usually used as the catalyst. To meet

• be done without compromise to the catalyst layer performance and durability. It is known that catalyst degradation via platinum dissolution and carbon corrosion plays an important role in the voltage degradation of PEMFCs [6][7][8]. CB, which is widely used, particularly for its low cost, suffers

Imaging the surface potential at the steps on the rutile TiO₂(110) surface by Kelvin probe force microscopy

• Masato Miyazaki,
• Huan Fei Wen,
• Quanzhen Zhang,
• Yuuki Adachi,
• Jan Brndiar,
• Ivan Štich,
• Yan Jun Li and
• Yasuhiro Sugawara

Beilstein J. Nanotechnol. 2019, 10, 1228–1236, doi:10.3762/bjnano.10.122

• steps in the catalytic reaction. Keywords: catalyst; Kelvin probe force microscopy; Smoluchowski effect; step; titanium dioxide; Introduction Titanium dioxide (TiO2) has attracted considerable interest for its promising applications as a photocatalyst and as catalyst support, as well as in gas sensors

Playing with covalent triazine framework tiles for improved CO₂ adsorption properties and catalytic performance

• Giulia Tuci,
• Andree Iemhoff,
• Housseinou Ba,
• Lapo Luconi,
• Andrea Rossin,
• Vasiliki Papaefthimiou,
• Regina Palkovits,
• Jens Artz,
• Cuong Pham-Huu and
• Giuliano Giambastiani

Beilstein J. Nanotechnol. 2019, 10, 1217–1227, doi:10.3762/bjnano.10.121

• ][40][41][42][43][44]. Most importantly, the rational balance between morphological and basic material surface properties has been claimed to control the catalyst stability on stream: the higher the “chemically accessible” surface basicity, the lower the sample deactivation/passivation due to the

• selectivity) as well as stability on stream. Results and Discussion Synthesis and characterization of CTF1–5 CTF samples have been prepared under ionothermal conditions, using molten ZnCl2 as reaction medium and Lewis acid cyanotrimerization catalyst [14]. As ZnCl2 is supposed to act as a porogene, it was

• comparative analysis of CTFs featuring different chemical and morphological properties, we postulated the existence of a close relationship between the rate of cracking side reactions leading to catalyst deactivation (formation of coke deposits) and the kinetic desorption of reagents and products from the

A highly efficient porous rod-like Ce-doped ZnO photocatalyst for the degradation of dye contaminants in water

• Binjing Hu,
• Qiang Sun,
• Chengyi Zuo,
• Yunxin Pei,
• Siwei Yang,
• Hui Zheng and
• Fangming Liu

Beilstein J. Nanotechnol. 2019, 10, 1157–1165, doi:10.3762/bjnano.10.115

• spectroscopy (XPS), scanning electron microscope (SEM) and inductively coupled plasma emission spectroscopy (ICP), respectively. The newly developed, robust, field-only surface integral method was employed to explore the relationship between the remarkable catalytic effect and the catalyst shape and porous

• concentration of RhB and catalyst, pH value and temperature. The results indicate that the pH value is the main influential factor in the photocatalytic degradation process and the optimal experimental conditions to achieve the maximum degradation rate of 97.66% in 2 hours are as follows: concentration (RhB

• ) = 10 mg/L, concentration (catalyst) = 0.7 g/L, pH 9.0 and T = 50 °C. These optimum conditions supply a helpful reference for large-scale wastewater degradation containing the common water contaminant RhB. Keywords: Ce-doped ZnO; photocatalyst; rhodamine B; solar degradation; surface shape

Photoactive nanoarchitectures based on clays incorporating TiO₂ and ZnO nanoparticles

• Eduardo Ruiz-Hitzky,
• Pilar Aranda,
• Marwa Akkari,
• Nithima Khaorapapong and
• Makoto Ogawa

Beilstein J. Nanotechnol. 2019, 10, 1140–1156, doi:10.3762/bjnano.10.114

• revealed by TEM (Figure 5A), leads to efficient nanostructured materials for the photocatalytic production of hydrogen tested in methanol photoreforming. Herein, montmorillonite-based nanoarchitectures are less efficient as hydrogen production catalyst than nanoarchitectures derived from sepiolite. Higher

• photodeposition procedure, reprinted with permission from [131], copyright 2015 Elsevier; (B) hydrogen production in methanol photoreforming using this Pt-doped clay nanoarchitecture as catalyst [131]. The structural arrangement of the [Ru(bpy)3]2+–TiO2@clay nanoarchitecture and its photocatalytic activity in the

Glucose-derived carbon materials with tailored properties as electrocatalysts for the oxygen reduction reaction

• Rafael Gomes Morais,
• Natalia Rey-Raap,
• José Luís Figueiredo and
• Manuel Fernando Ribeiro Pereira

Beilstein J. Nanotechnol. 2019, 10, 1089–1102, doi:10.3762/bjnano.10.109

• beneficial for the electrochemical activity of the prepared electrocatalysts [12]. This is not observed for carbonized samples as they do not present superior textural properties, compromising some of the effects that nitrogen could have on the carbon as a catalyst. Information about the limiting current

Concurrent nanoscale surface etching and SnO₂ loading of carbon fibers for vanadium ion redox enhancement

• Jun Maruyama,
• Shohei Maruyama,
• Tomoko Fukuhara,
• Toru Nagaoka and
• Kei Hanafusa

Beilstein J. Nanotechnol. 2019, 10, 985–992, doi:10.3762/bjnano.10.99

• -oxide nanoparticles to further enhance the activity and found that through the thermal oxidation of the carbonaceous thin film derived from SnPc both types of enhancement can be concurrently achieved. The formed metal oxide, SnO2, is one of the candidates for a durable catalyst support used in an acidic

Direct growth of few-layer graphene on AlN-based resonators for high-sensitivity gravimetric biosensors

• Jimena Olivares,
• Teona Mirea,
• Lorena Gordillo-Dagallier,
• Bruno Marco,
• José Miguel Escolano,
• Marta Clement and
• Enrique Iborra

Beilstein J. Nanotechnol. 2019, 10, 975–984, doi:10.3762/bjnano.10.98

• nickel catalyst layers The thickness of the catalyst Ni layers was reduced to 100 nm, which was thin enough as not to compromise the resonator performance but sufficient to avoid the formation of Ni droplets on the surface of the SMRs during the heating processes due to dewetting [17]. However, the

• ) and low (SiO2) acoustic impedance of the fully insulating reflector, the Ir/AlN/Mo piezoelectric stack and the Ni catalyst that covers the active area of the device (Figure 8a). All these layers were adjusted to set the resonant frequency to the desired value and to achieve the best performance of the

• the films involved in the SMR structure were deposited by sputtering, except the Ir bottom electrode and the Ni catalyst that were e-beam evaporated. The deposition conditions of the AlN and SiO2 layers in the reflector were carefully adjusted to minimize residual stresses in each film. The final

Synthesis of novel C-doped g-C₃N₄ nanosheets coupled with CdIn₂S₄ for enhanced photocatalytic hydrogen evolution

• Jingshuai Chen,
• Chang-Jie Mao,
• Helin Niu and
• Ji-Ming Song

Beilstein J. Nanotechnol. 2019, 10, 912–921, doi:10.3762/bjnano.10.92

• transfer nanochannels [5]. The as-prepared g-C3N4 nanosheet@ZnIn2S4 nanoleaf structure displays an enhanced photocatalytic activity for H2 production without the addition of a Pt co-catalyst. As visible-light-active photocatalysts, ternary metal sulfide (e.g., ZnIn2S4 and CdIn2S4) have attracted great

• enhance photocatalytic activity. Accordingly, the two-step fabrication of CdIn2S4/CCN photocatalysts with different CdIn2S4 content is the target of this study. It is demonstrated that the CdIn2S4/CCN hybrid shows a superior H2 production activity without the addition of a Pt co-catalyst under visible

• use of the additive Pt co-catalyst. As shown in Figure 8, the pristine g-C3N4 presents a negligible H2 generation rate, but after introduction of the self-doped C by a simple supramolecular self-assembly method, the CCN nanosheets display a higher H2 generation rate due to the presence of the large

Synthesis of MnO₂–CuO–Fe₂O₃/CNTs catalysts: low-temperature SCR activity and formation mechanism

• Yanbing Zhang,
• Lihua Liu,
• Yingzan Chen,
• Xianglong Cheng,
• Chengjian Song,
• Mingjie Ding and
• Haipeng Zhao

Beilstein J. Nanotechnol. 2019, 10, 848–855, doi:10.3762/bjnano.10.85

• conversions of 4% MnO2–CuO–Fe2O3/CNTs catalyst of 43.1–87.9% at 80–180 °C were achieved, which was ascribed to the generation of amorphous MnO2, CuO and Fe2O3, and a high surface-oxygen (Os) content. Keywords: amorphous materials; carbon nanotubes; low-dimensional materials; low-temperature catalysis; SCR

• , the catalyst of the SCR reaction, V2O5+WO3(MoO3)/TiO2, has some drawbacks, such as the toxic V-based material and the high operating temperature window (300–400 °C) [6][7][8]. Additionally, this kind of catalyst is easily influenced by ash and SO2, which makes it necessary to be installed downstream

• of electrostatic precipitator and desulfurizer, where the flue gas temperature is normally below 200 °C [9]. Therefore, it is of importance to develop a SCR catalyst with high catalytic activity below 200 °C. Carbon nanotubes (CNTs), a low-dimensional material, exhibit a one-dimensional tubular

Deposition of metal particles onto semiconductor nanorods using an ionic liquid

• Michael D. Ballentine,
• Elizabeth G. Embry,
• Marco A. Garcia and
• Lawrence J. Hill

Beilstein J. Nanotechnol. 2019, 10, 718–724, doi:10.3762/bjnano.10.71

• using the methods reported here. Keywords: catalyst; ionic liquid; methylene blue; platinum; semiconductor nanorod; Introduction Core@shell semiconductor nanorods with attached noble metal particles have been widely studied as photocatalysts, and any improvement on the synthesis of these materials has

• heterostructured nanoparticles. With two nearly identical samples in hand, we were able to compare the performance of two catalysts where the only notable difference was the synthetic history of the sample (Figure 2). We used photocatalytic degradation of methylene blue to compare catalyst performance since this

• toluene/triethylamine. A known amount of the nanoparticle catalyst was combined with methylene blue and chloroform for photocatalytic dye degradation experiments (Figure 2a), based on the concentration of cadmium and platinum in the toluene dispersions obtained from ICP-AES. Control experiments were also

Mo-doped boron nitride monolayer as a promising single-atom electrocatalyst for CO₂ conversion

• Qianyi Cui,
• Gangqiang Qin,
• Weihua Wang,
• Lixiang Sun,
• Aijun Du and
• Qiao Sun

Beilstein J. Nanotechnol. 2019, 10, 540–548, doi:10.3762/bjnano.10.55

• CRR. This work not only provides insight into the mechanism of CRR on the single-atom catalyst (Mo-doped BN monolayer) at the atomic level, but also offers guidance in the search for appropriate earth-abundant TMs as electrochemical catalysts for the efficient conversion of CO2 to useful fuels under

• catalyst for further investigation of CO2 conversion due to its high selectivity and activation for CO2. The study shows that Mo-doped BN monolayers can be used as a promising catalyst for CO2 reduction to CH4 with a low limiting potential of −0.45 V. More importantly, Mo is an abundant element in the

• efficiency SACs for converting CO2 to useful hydrocarbon fuels. Results and Discussion Transition metal selection for CO2 reduction reaction For efficient CO2 reduction, the most critical requirement is that the CO2 molecule can selectively adsorb onto the catalyst and guarantee sufficient activation for CRR

Temperature-dependent Raman spectroscopy and sensor applications of PtSe₂ nanosheets synthesized by wet chemistry

• Mahendra S. Pawar and
• Dattatray J. Late

Beilstein J. Nanotechnol. 2019, 10, 467–474, doi:10.3762/bjnano.10.46

• , field emitters, battery materials, light harvesting and energy storage devices, catalyst for H2 generation, and drug delivery applications [7][8][9][10][11][12]. Most of the transition metal dichalcogenides (TMDCs) are semiconducting in nature with MX2 type – where M is a metal, M = W, Mo, Sn, Nb, V

Reduced graphene oxide supported C₃N₄ nanoflakes and quantum dots as metal-free catalysts for visible light assisted CO₂ reduction

• Md Rakibuddin and
• Haekyoung Kim

Beilstein J. Nanotechnol. 2019, 10, 448–458, doi:10.3762/bjnano.10.44

• of photo-induced electron–hole pairs and insufficient adsorption of CO2 at the catalyst surface are crucial problems preventing effective catalyst performance and CO2 reduction [11]. An ideal photocatalyst for CO2 conversion should possess a narrow bandgap and good light-harvesting properties, proper

• ). The stability of a catalyst is of paramount importance for practical applications. Hence, the prepared GCN-5 sample was recycled several times to check its reduction performance. It is observed that no significant loss in activity is observed even after the fourth cycle (Figure 12). Hence, the

• 13CH3OH, respectively. The photoreduction mechanism of CO2 to HCHO in the presence of the GCN-5 catalyst under visible light illumination is shown in Figure 13. The CN QDs absorb visible wavelengths of sunlight due to their appropriate band edge potential value, thus exciting the electrons. These excited

Improving control of carbide-derived carbon microstructure by immobilization of a transition-metal catalyst within the shell of carbide/carbon core–shell structures

• Teguh Ariyanto,
• Jan Glaesel,
• Andreas Kern,
• Gui-Rong Zhang and
• Bastian J. M. Etzold

Beilstein J. Nanotechnol. 2019, 10, 419–427, doi:10.3762/bjnano.10.41

• synthesis remains a challenge. In this work, the controllability of the synthesis route is enhanced by immobilizing the transition-metal graphitization catalyst on a porous carbon shell covering the carbide precursor prior to conversion of the carbide core to carbon. The catalyst loading was varied and the

• graphitization; graphitic carbon; pore structure; transition metal; Introduction Carbon is a versatile material that has been widely utilized in many applications such as adsorption [1][2][3], catalysis [4][5], catalyst support [6][7][8], molecular sieves [9][10] and energy storage [11][12][13], owing to its

• types of carbides [19]). Commonly used graphitization catalysts are transitions metals such as Fe, Ni, and Co [18][21][22]. The conventional method for catalytic graphitization is to mix the non-porous carbide and metal catalyst precursor prior to the selective etching at high temperature. Indeed, the

Sub-wavelength waveguide properties of 1D and surface-functionalized SnO₂ nanostructures of various morphologies

• Venkataramana Bonu,
• Binaya Kumar Sahu,
• Arindam Das,
• Sankarakumar Amirthapandian,
• Sandip Dhara and
• Harish C. Barshilia

Beilstein J. Nanotechnol. 2019, 10, 379–388, doi:10.3762/bjnano.10.37

• commercial application as a gas sensor, transparent conducting electrodes, and catalyst [13][14][15]. SnO2 NSs have been used in several other areas such as sub-wavelength waveguide sensors [4], microelectronics [6], Li-ion batteries [16], and lubricants [17]. Oxygen vacancy related defects in SnO2

• thickness was coated on the Si (100) substrate by using the thermal evaporation (Hind Vacuum, India) technique under a base pressure of 5.0 × 10−6 mbar. The Si substrate coated with the Au film, used as a catalyst in the growth of SnO2 NWs, was placed 10 mm away from the precursor material in the Al2O3 boat

• crucible without any metal catalyst under atmospheric pressure at a temperature of 1000 °C in continuous Ar flow. The temperature profile is shown in Supporting Information File 1, Figure S1b. The growth time was kept for 2 h for all the NWs. Morphological studies of the NWs were revealed by field emission

Thermal control of the defunctionalization of supported Au₂₅(glutathione)₁₈ catalysts for benzyl alcohol oxidation

• Zahraa Shahin,
• Hyewon Ji,
• Rodica Chiriac,
• Nadine Essayem,
• Franck Rataboul and
• Aude Demessence

Beilstein J. Nanotechnol. 2019, 10, 228–237, doi:10.3762/bjnano.10.21

• des Multimatériaux et Interfaces (LMI), Villeurbanne, France 10.3762/bjnano.10.21 Abstract Au25(SG)18 (SG – glutathione) clusters deposited on ZrO2 nanoparticles have been used as a catalyst for benzyl alcohol oxidation. Calcination was performed at different temperatures to study the ligand and

• particle size effect on the catalytic activity. In contrast to most gold nanoclusters which have to be completely defunctionalized for maximum catalytic activity, the partially defunctionalized Au25(SG)18@ZrO2 catalyst, thermally treated at 300 °C, exhibits full conversion of benzyl alcohol within 15 h

• under atmospheric pressure with 94% selectivity towards benzaldehyde. Keywords: benzyl alcohol oxidation; glutathione; gold nanoclusters; partial defunctionalization; supported catalyst; zirconium oxide nanoparticles; Introduction Since Haruta’s discovery of the catalytic activity of gold

Nanoporous water oxidation electrodes with a low loading of laser-deposited Ru/C exhibit enhanced corrosion stability

• Sandra Haschke,
• Dmitrii Pankin,
• Vladimir Mikhailovskii,
• Maïssa K. S. Barr,
• Adriana Both-Engel,
• Alina Manshina and
• Julien Bachmann

Beilstein J. Nanotechnol. 2019, 10, 157–167, doi:10.3762/bjnano.10.15

• , Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russia 10.3762/bjnano.10.15 Abstract For the oxidation of water to dioxygen, oxide-covered ruthenium metal is known as the most efficient catalyst, however, with limited stability. Herein, we present a strategy for incorporating a Ru/C

• to planar samples at pH 4. Finally, their electrocatalytic performance depends on the geometric parameters and is optimized with 13 μm pore length, which yields 2.6 mA cm−2, or 49 A g−1, at η = 0.20 V. Keywords: electrochemistry; nanostructures; noble metals; ruthenium catalyst; water splitting

• artificial water splitting, catalysts are required for the rate-limiting half reaction, the dioxygen evolution, which must be driven at low overpotential (for maximizing conversion efficiency) [2]. The most active catalyst materials for this transformation are metallic iridium and ruthenium particles, the

Wet chemistry route for the decoration of carbon nanotubes with iron oxide nanoparticles for gas sensing

• Hussam M. Elnabawy,
• Juan Casanova-Chafer,
• Badawi Anis,
• Mostafa Fedawy,
• Mattia Scardamaglia,
• Carla Bittencourt,
• Ahmed S. G. Khalil,
• Eduard Llobet and
• Xavier Vilanova

Beilstein J. Nanotechnol. 2019, 10, 105–118, doi:10.3762/bjnano.10.10

• (NO3)3·9H2O 99.95% trace metal basic) Acetic acid, Fluka Analytical (CH3COOH 99.8%) Decoration and characterization of carbon nanotubes Commercial CNTs from Nanocyl functionalized with (COOH) groups were further chemically purified by an acidic treatment to remove any traces of catalyst or amorphous

Amorphous Ni_xCo_yP-supported TiO₂ nanotube arrays as an efficient hydrogen evolution reaction electrocatalyst in acidic solution

• Yong Li,
• Peng Yang,
• Bin Wang and
• Zhongqing Liu

Beilstein J. Nanotechnol. 2019, 10, 62–70, doi:10.3762/bjnano.10.6

• active site density, and thus the electrocatalytic activity. The Nyquist and Bode plots are displayed in Figure 8. In the Nyquist plot, the arc radius of the high-frequency section corresponds to the impedance of charge transfer between electrolyte and the catalyst surface, and the ones of the low

• the high and low frequency sections of sample NixCoyP/TNAs are smaller than that of Ni–P/TNAs, suggesting that the NiCoP hybrid enhanced the charge transfer inside the electrode and between the electrolyte and catalyst surface. The Bode plots (Figure 8b) show that for the two samples, the total

• NiCoP HER electrocatalyst. The catalyst showed a high electrochemically active center density that benefited the electron transfer within the electrode and between electrolyte and electrode surface. The electrocatalytic activity of the HER was thus improved. In the two-electrode system using NixCoyP

Characterization and influence of hydroxyapatite nanopowders on living cells

• Przemyslaw Oberbek,
• Tomasz Bolek,
• Adrian Chlanda,
• Seishiro Hirano,
• Sylwia Kusnieruk,
• Julia Rogowska-Tylman,
• Ganna Nechyporenko,
• Viktor Zinchenko,
• Wojciech Swieszkowski and
• Tomasz Puzyn

Beilstein J. Nanotechnol. 2018, 9, 3079–3094, doi:10.3762/bjnano.9.286

• chromatography, protein purification, cell-culture substrates, catalyst production and waste management. Lower crystallinity, high purity and high zeta potential of hydroxyapatite nanoparticles are desired in a material intended for long-term medical use in the body. Since calcium deficiency is a feature of