Research on Cu-doped SnS2 nanoflowers for efficient electrochemical reduction of CO2 to synthesize formate
丁笑含 1赵林飞 1袁章福 1田越 1徐秉声2
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作者信息
1. 北京科技大学钢铁共性技术协同创新中心,北京 100083
2. 中国标准化研究院资源环境研究分院,北京 100191
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摘要
为了提高Sn基材料表面CO2 电化学还原为甲酸盐的法拉第效率,利用一步溶剂热法合成了具有丰富硫空位的Cu掺杂SnS2 纳米花(Cu-SnS2-x)催化剂,在较宽的电位窗口实现了CO2 电化学还原制备甲酸盐.结果表明,通过调控催化剂制备过程中Cu和Sn的摩尔比,在-1.1 V vs.RHE电位条件下得到了 72.64%的FEformate,电流密度Jformate达到-14.38 mA/cm2.二维纳米片阵列增加了催化活性位点,Cu掺杂所产生的硫空位能够协同提高催化活性、促进电子转移,从而提高甲酸盐的选择性.
Abstract
To enhance the Faraday efficiency of the surface of Sn-based materials for electrochemical reduction of CO2 to formate,Cu-doped SnS2 nanoflower(Cu-SnS2-x)catalysts enriched with sulfur vacancies are synthesized via a one-step solvothermal method.The prepared catalysts facilitate the electrochemical reduction of CO2 to formate over a broad potential window.By adjusting the molar ratio of Cu to Sn during the catalyst preparation process,a formate Faraday efficiency of 72.64%is achieved at a potential of-1.1 V vs.RHE,with a formate current density reaching-14.38 mA·cm-2.Two-dimensional nanosheet array increases the active sites of the catalysts,and the sulfur vacancies induced by Cu doping synergistically enhances catalytic activity and facilitates electron transfer,thereby improving the selectivity of formate.
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