材料科学
电解质
催化作用
电化学
化学工程
纳米颗粒
电导率
无机化学
水溶液
电极
纳米技术
化学
物理化学
有机化学
工程类
作者
Yuwei Wang,Ru Xu Du,Zhuo Li,Haoran Song,Zhe Chao,Daoyuan Zu,Daotong Chong,Ningbo Gao,Changping Li
标识
DOI:10.1016/j.ceramint.2021.06.249
摘要
MXene-based catalysts have shown excellent activities in various electrocatalytic reactions due to the two-dimensional structure, good electrical conductivity and abundant surface functional groups. However, because of the competitive reactions in aqueous electrolytes, the application of MXene materials in CO2 electroreduction still remains a challenge. Herein, a simple strategy was developed for the design of high efficient and stable CO2 electroreduction catalysts in aqueous electrolyte. A series of MXene composite catalysts were successfully synthesized by densely coating sulfur vacancy-rich CdS nanoparticles on Ti3C2. The two-dimensional MXene skeleton with good conductivity delivers fast electron transfer, improves the electrolyte infiltration and increases the electrochemical surface area. CdS nanoparticles with abundant sulfur vacancies are attached on Ti3C2 MXene surface, providing active sites for CO2 reduction. Faraday efficiency of the by-product hydrogen could be significantly reduced by minimizing the surface-exposed Ti of the catalyst. Benefited from these merits, the optimal CdS/Ti3C2 possesses fast CO2 electroreduction reaction kinetics, exhibiting a high CO Faraday efficiency of 94% at -1.0 V vs. reversible hydrogen electrode. This work provides a feasible pathway for the design of MXene-based catalysts of CO2 electroreduction.
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