CuSn Alloy Nanoparticles on Nitrogen-Doped Graphene for Electrocatalytic CO2 Reduction
发表时间：2020-02-12
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- 论文类型：
- 期刊论文
- 第一作者：
- Xiong, Wei
- 合写作者：
- Yang, Jian,Shuai, Ling,Hou, Yang,Qiu, Ming,Li, Xinyong,Leung, Michael K. H.
- 发表时间：
- 2019-12-13
- 发表刊物：
- CHEMELECTROCHEM
- 收录刊物：
- SCIE
- 文献类型：
- J
- 卷号：
- 6
- 期号：
- 24
- 页面范围：
- 5951-5957
- ISSN号：
- 2196-0216
- 关键字：
- CuSn nanoparticles; nitrogen-doped graphene; bimetal alloy; electrocatalysis; carbon dioxide reduction
- 摘要：
- 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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