caa a22 4500 475816021 CHVBK 20180406123810.0 cr unu---uuuuu 170329e20000801xx s 000 0 eng 10.1023/A:1003946512641 doi (NATIONALLICENCE)springer-10.1023/A:1003946512641 Saleh Mahmoud Chemistry Department, Faculty of Science, Cairo University, Cairo, Egypt aut Electrochemical hydrogen evolution on polypyrrole from alkaline solutions [Elektronische Daten] [Mahmoud Saleh] Thin films of conductive polypyrrole (PPy) were formed electrochemically from aqueous sulfuric acid. The films showed good electrocatalytic properties towards hydrogen evolution (h.e.r) from alkaline solutions on planar and packed-bed iron electrodes. Current-potential relations were measured at various temperatures and KOH concentrations on Fe, Ni and Fe/PPy planar electrodes. The current was found to be constant during 40 h of operation. SEM micrographs showed no difference in the morphology before and after this period. The activation energy for h.e.r. was found to be 50.2, 58.5 and 33.4 kJ mol−1 for Fe, Ni and Fe/PPy planar electrodes, respectively. The results showed that Fe/PPy can be used to produce hydrogen at both ambient and relatively high temperatures ∼70 ∘C. The polypyrrole coating on iron screens was found to reduce the potential required to sustain a specific rate of hydrogen generation and, hence, the energy consumed during the process. Kluwer Academic Publishers, 2000 conductive polymers nationallicence hydrogen nationallicence iron nationallicence nickel nationallicence polypyrrole nationallicence porous electrodes nationallicence Journal of Applied Electrochemistry Kluwer Academic Publishers 30/8(2000-08-01), 939-944 0021-891X 30:8<939 2000 30 10800 https://doi.org/10.1023/A:1003946512641 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1003946512641 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Saleh Mahmoud Chemistry Department, Faculty of Science, Cairo University, Cairo, Egypt aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/8(2000-08-01), 939-944 0021-891X 30:8<939 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer