期刊
ACS CATALYSIS
卷 11, 期 9, 页码 5035-5046出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c05701
关键词
electrocatalysis; oxygen reduction reaction; H2O2 production; heteroatom doping; carbon
资金
- China Scholarship Council
- Imperial College London
- U.K. Engineering and Physical Sciences Research Council [EP/J016454/1]
- EPSRC [EP/J016454/1] Funding Source: UKRI
The study presents the synthesis of cobalt nanoparticles supported on nitrogen-doped carbon with high selectivity and activity for reducing oxygen into hydrogen peroxide in alkaline electrolyte, as well as low activity towards hydrogen peroxide disproportionation reaction.
We report the synthesis of cobalt nanoparticles supported on nitrogen-doped carbon (Co-NPs@N/C), which can reduce O-2 into H2O2 with high selectivity (up to 93%) in 0.1 M KOH electrolyte and retains >90% activity even after 10 h polarization. The catalyst achieves a current density of 1 mA cm(-2) at 0.76 V(RHE) and a peroxide production rate of similar to 3.8mol(H2O2) g(Co)(-1) h(-1) over a 10 h period. Our study also highlights the requirement for good peroxide production catalysts to be poor hydrogen peroxide disproportionation catalysts. We show how the high activity of the Co-NPs@N/C catalyst is correlated with low activity toward the peroxide disproportionation reaction.
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