Journal
NANO RESEARCH
Volume 7, Issue 7, Pages 1054-1064Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0468-1
Keywords
oxygen reduction reaction; electrocatalysis; CoO; Co/N-C
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Funding
- national Basic Research Program of China [2014CB643506, 2013CB922104, 2011CBA00703]
- National Natural Science Foundation of China (NSFC) [201173091, 21103057, 21161160445]
- CME
- New Century Excellent Talents in University [NCET-10-0416]
- Carl von Ossietzky University of Oldenburg
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Over the past few years, electrocatalysis for the oxygen reduction reaction in alkaline solutions has undergone tremendous advances, and non-precious metal catalysts are of prime interest. In this study, we present a highly promising CoO@Co/N-C (where N-C represents a N-doped carbon material) catalyst, achieving an onset potential of 0.99 V (versus the reversible hydrogen electrode (RHE)) and a limiting current density of 7.07 mA center dot cm(-2) (at 0.3 V versus RHE) at a rotation rate of 2,500 rpm in an O-2-saturated 0.1 M KOH solution, comparable to a commercial Pt/C catalyst. The H-2-O-2 alkaline fuel cell test of CoO@Co/N-C as the cathode reveals a maximum power density of 237 mW center dot cm(-2). Detailed investigation clarifies that a synergistic effect, induced by C-N, Co-N-C, and CoO/Co moieties, is responsible for the bulk of the gain in catalytic activity.
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