Search for "polymer electrolyte membrane" in Full Text gives 2 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2022, 18, 1505–1506, doi:10.3762/bjoc.18.158
Beilstein J. Org. Chem. 2018, 14, 537–546, doi:10.3762/bjoc.14.40