期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 114, 期 19, 页码 6542-6548出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp102367u
关键词
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资金
- National Basic Research Development Program of China (973 Program) [2007CB613501]
- National 863 Project of China [2009AA064003]
- National Natural Science Foundation of China [50874099, 50904057]
- Chinese Academy of Sciences [KGCX2-YW-321-2]
The oxygen reduction reaction (ORR) on a polycrystalline Pt surface was studied using cyclic voltammetry techniques, and the influence of reaction media on the ORR is examined by comparing the ORR in NaOH and KOH solutions with concentration ranging from 0.5 to 14 M at 298 K. The results show that, in NaOH and KOH solutions, the ORR, a quasi-reversible diffusion-controlled reaction, is largely dependent on the electrolyte conditions, and KOH solutions are superior to NaOH solutions for the ORR process in both thermodynamic and kinetic consideration. As the alkaline concentration increases, the ORR performance frustrates, and the protonation of superoxide is suppressed; thus, the ORR shifts from a 2e reduction pathway to a le reduction pathway in both solutions.
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