Boosted photoreduction of diluted CO2 through oxygen vacancy engineering in NiO nanoplatelets

• 作者: Weiyi Chen Xueming Liu Bin Han Shujie Liang Hong Deng Zhang Lin
• 来源期刊: 纳米研究（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Research Articles
• 页码范围: 730-737
• 页数: 8页
• 语种: 英文

摘要

Converting carbon dioxide (CO2) to diverse value-added products through photocatalysis can validly alleviate the critical issues of greenhouse effect and energy shortages simultaneously.In particular,based on practical considerations,exploring novel catalysts to achieve efficient photoreduction of diluted CO2 is necessary and urgent.However,this process is extremely challenging owing to the disturbance of competitive adsorption at low CO2 concentration.Herein,we delicately synthesize oxygen vacancy-laden NiO nanoplatelets (r-NlO) via calcination under Ar protection to reduce diluted CO2 through visible light irradiation (＞ 400 nm) assisted by a Ru-based photosensitizer.Benefitting from the strongly CO2 adsorption energy of oxygen vacancies,which was confirmed by density functional calculations,the r-NiO catalysts exhibit higher activity and selectivity (6.28 × 103 μmol·h-1·g-1;82.11％) for diluted CO2-to-CO conversion than that of the normal NiO (3.94 × 10s μmol·h-1·g-1;65.26％).Besides,the presence of oxygen vacancies can also promote the separation of electron-hole pairs.Our research demonstrates that oxygen vacancies could act as promising candidates for photocatalytic CO2 reduction,offering fundamental guidance for the actual photoreduction of diluted CO2 in the future.