期刊
JOURNAL OF POWER SOURCES
卷 284, 期 -, 页码 27-37出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.02.143
关键词
Nickel oxyhydroxide; Anion exchange ionomer; Methanol oxidation; Oxygen evolution; Alkaline medium
资金
- National Science Foundation [1057597]
- Utah Materials Research Science and Engineering Center [DMR 11-21252]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1057597] Funding Source: National Science Foundation
Nickel based catalysts have been studied as catalysts for either organic compound (especially methanol) oxidation or oxygen evolution reactions in alkaline medium for decades, but methanol oxidation and oxygen evolution reactions occur at a similar potential range and pH with nickel based catalysts. In contrast to previous studies, we studied these two reactions simultaneously under various pH and methanol concentrations with electrodes containing a series of NiOOH surface concentrations. We found that nickel based catalysts are more suitable to be used as oxygen evolution catalysts than methanol oxidation catalysts based on the observation that: The rate-determining step of methanol oxidation involves NiOOH, OH- and methanol while high methanol to OH- ratio could poison the NiOOH sites. Since NiOOH is involved in the rate-determining step, methanol oxidation suffers from high over-potential and oxygen evolution is favored over methanol oxidation in the presence of an equivalent amount (0.1 M) of alkali and methanol. (C) 2015 Elsevier B.V. All rights reserved.
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