Stick–slip behaviour on Au(111) with adsorption of copper and sulfate

• Nikolay Podgaynyy,
• Sabine Wezisla,
• Christoph Molls,
• Shahid Iqbal and
• Helmut Baltruschat

Beilstein J. Nanotechnol. 2015, 6, 820–830, doi:10.3762/bjnano.6.85

• zero Cu coverage into the copper 2/3 adlayer region [10]. A similar effect was observed previously on Pt(111) during the formation of a copper monolayer [11]. Bennewitz et al. observed such an increase on Au(111) upon Cu adsorption during potential cycling [12]. Obviously, this increase in friction is

Restructuring of an Ir(210) electrode surface by potential cycling

• Khaled A. Soliman,
• Dieter M. Kolb,
• Ludwig A. Kibler and
• Timo Jacob

Beilstein J. Nanotechnol. 2014, 5, 1349–1356, doi:10.3762/bjnano.5.148

• This study addresses the electrochemical surface faceting and restructuring of Ir(210) single crystal electrodes. Cyclic voltammetry measurements and in situ scanning tunnelling microscopy are used to probe structural changes and variations in the electrochemical behaviour after potential cycling of Ir

• electrochemically. The simple polarization of Ir(210) at positive potentials did not lead to the formation of facets. However, potential cycling into the surface oxidation potential region leads to a restructuring of the Ir(210) surface. Carbon monoxide adlayer oxidation was chosen as a structure-sensitive reaction

• ], we assume that unreconstructed Ir(210) surfaces are also obtained after annealing and cooling in CO or H2. Potential cycling effects on Ir(210) surface Previous theoretical studies predicted an electrochemical facet formation, i.e., potential-induced, on Ir(210) surface upon adsorption of oxygen [19

Design criteria for stable Pt/C fuel cell catalysts

• Josef C. Meier,
• Carolina Galeano,
• Ioannis Katsounaros,
• Jonathon Witte,
• Hans J. Bongard,
• Angel A. Topalov,
• Claudio Baldizzone,
• Stefano Mezzavilla,
• Ferdi Schüth and
• Karl J. J. Mayrhofer

Beilstein J. Nanotechnol. 2014, 5, 44–67, doi:10.3762/bjnano.5.5

• for all of the above mentioned processes under aggressive potential cycling conditions, namely platinum dissolution [16][68], coalescence [16][41][42], particle detachment [42][51][52], carbon corrosion [16][49][70] and Ostwald ripening (3D) [64]. In many cases, several of the discussed mechanisms

• for designing a stable cathode catalyst. Even though it has to be highlighted that the according potential cycling experiments cannot directly reproduce all the phenomena that occur in a real fuel cell as for instance demonstrated recently by Durst et al. [76], they can provide valuable insights about

• mesoporous network. Potential cycling may help to corrode the carbon that is in contact with the sintered platinum particles allowing the recovery of accessibility. The ECSA obtained after 1080 activation/degradation cycles is 80 m2·g−1, which is comparable to the initial ECSA of the Pt/Vulcan 3–4 nm