Vacancy-defect modulated pathway of photoreduction of CO(2) on single atomically thin AgInP(2)S(6) sheets into olefiant gas.

Vacancy-defect modulated pathway of photoreduction of CO(2) on single atomically thin AgInP(2)S(6) sheets into olefiant gas.
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单原子薄 AgInP2S6 片上 CO2 光还原成烯烃气体的空位缺陷调制途径

DOI:
10.1038/s41467-021-25068-7
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发表时间:
2021-08-06
影响因子:
16.6
通讯作者:
Zou Z
Zou Z
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Gao W;Li S;He H;Li X;Cheng Z;Yang Y;Wang J;Shen Q;Wang X;Xiong Y;Zhou Y;Zou Z

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人工光合作用,将二氧化碳转化为碳氢化合物燃料,是同时克服全球变暖和能源供应问题的一种很有前途的策略。采用超声易剥法制备了厚度为~ 0.70 nm的四元AgInP2S6原子层。通过H2O2蚀刻处理在该原子层上进行硫缺陷工程,可以有效地改变CO2光还原反应途径,引导优势生成乙烯,产率选择性达到~73%,电子选择性高达~89%。DFT计算和原位FTIR光谱均表明,由于AgInP2S6中S空位的引入导致S空位附近Ag原子上的电荷积累,因此暴露的Ag位可以有效捕获形成的*CO分子。使催化剂表面富集关键反应中间体,降低C-C结合偶联势垒,有利于乙烯的生成。
Artificial photosynthesis, light-driving CO2 conversion into hydrocarbon fuels, is a promising strategy to synchronously overcome global warming and energy-supply issues. The quaternary AgInP2S6 atomic layer with the thickness of ~ 0.70 nm were successfully synthesized through facile ultrasonic exfoliation of the corresponding bulk crystal. The sulfur defect engineering on this atomic layer through a H2O2 etching treatment can excitingly change the CO2 photoreduction reaction pathway to steer dominant generation of ethene with the yield-based selectivity reaching ~73% and the electron-based selectivity as high as ~89%. Both DFT calculation and in-situ FTIR spectra demonstrate that as the introduction of S vacancies in AgInP2S6 causes the charge accumulation on the Ag atoms near the S vacancies, the exposed Ag sites can thus effectively capture the forming *CO molecules. It makes the catalyst surface enrich with key reaction intermediates to lower the C-C binding coupling barrier, which facilitates the production of ethene.
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