期刊
CHEMELECTROCHEM
卷 6, 期 24, 页码 5951-5957出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201901381
关键词
CuSn nanoparticles; nitrogen-doped graphene; bimetal alloy; electrocatalysis; carbon dioxide reduction
资金
- CityU Strategic Research Grant [7004689, 7004923]
- NSFC [21875200, 51702284]
- Hong Kong Scholars Program [XJ2017051]
- Fundamental Research Funds for the Central Universities [DUT16RC(3)095, 112109*172210171]
- Open Foundation of Key Laboratory of Industrial Ecology and Environmental Engineering, China Ministry of Education [KLIEEE-17-09]
- Program of Introducing Talents of Discipline to Universities [B13012]
- Supercomputing Center of Dalian University of Technology
- Startup Foundation for Hundred-Talent Program of Zhejiang University [112100-193820101/001/022]
- Hubei Natural Science Foundation of China [2018CFB531]
- Self-determined Research Funds of CCNU from Colleges' Basic Research and Operation of MOE [CCNU18TS045]
We report an efficient electrocatalyst utilizing non-noble metals consisting of Cu and Sn supported on nitrogen-doped graphene (NG) for reduction of CO2 over a wide potential range. The CuSn alloy nanoparticles (NPs) on NG were prepared through a hydrothermal method followed by pyrolysis under nitrogen atmosphere to achieve a uniform dispersion of the alloy NPs. The CuSn NP (Cu/Sn ratio of 0.175) decorated NG catalyst performed electrocatalytic reduction of CO2 into C1 products at a Faradaic efficiency (FE) of nearly 93 % at an overpotential of -1.0 V vs. RHE, considerably higher than that of the Cu and Sn counterparts, i. e., 32 % and 58 %, respectively. The enhanced catalytic activity could be attributed to the collaboration between the CuSn alloy and Sn metal. The first-principles density functional theory (DFT) simulation results indicate that the CuSn bimetal alloy nanoparticles enable more H atoms to participate in the electrocatalytic reduction of CO2 and exhibit an improved CO2 capture performance. In addition, the CuSn alloy having a lower barrier than that of Sn metal can accelerate the CO2 reduction process. This study presents the strategy that utilizes low-cost non-noble metals as highly efficient electrocatalysts for aqueous reduction of CO2.
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