期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 75, 期 -, 页码 38-42出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2016.12.011
关键词
ORR; PGM-free; Current production; Electron transfer; Neutral pH
资金
- Bill & Melinda Gates Foundation [OPP1139954]
- Bill and Melinda Gates Foundation [OPP1139954] Funding Source: Bill and Melinda Gates Foundation
Platinum group metal-free (PGM-free) catalysts based on M-N-C types of materials with M as Mn, Fe, Co and Ni and aminoantipyrine (AAPyr) as N-C precursors were synthesized using sacrificial support method. Catalysts kinetics of oxygen reduction reaction (ORR) was studied using rotating ring disk electrode (RRDE) in neutral pH. Results showed that performances were distributed among the catalysts as: Fe-AAPyr > Co-AAPyr > Mn-AAPyr > Ni-AAPyr. Fe-AAPyr had the highest onset potential and half-wave potential. All the materials showed similar limiting current. Fe-AAPyr had an electron transfer involving 4e(-) With peroxide formed lower than 5%. Considering H2O2 produced, it seems that Co-AAPyr, Mn-AAPyr and Ni-AAPyr follow a 2 x 2e(-) mechanism with peroxide formed during the intermediate step. Durability test was done on Fe-AAPyr for 10,000 cycles. Decrease of activity was observed only after 10,000 cycles. (C) 2016 The Authors. Published by Elsevier B.V.
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