Journal
NANO ENERGY
Volume 84, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.105869
Keywords
Grain boundary; Strain; Oxygen vacancy; CO2 photoreduction
Categories
Funding
- National Natural Science Foundation of China [21676128, 22075113, 51902138]
- Jiangsu Fund for Distinguished Young Scientists [BK20190045]
- Natural Science Foundation of Jiangsu Province [BK20180870, BK20190981, BK20190835]
- China Postdoctoral Science Foundation [2019M661765, 2019M661740]
- Hightech Research Key laboratory of Zhenjiang [SS2018002]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- HighPerformance Computing Platform of Jiangsu University
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Researchers reported a strategy utilizing grain-boundary surface terminations and oxygen vacancies to synergistically enhance photocatalytic CO2 reduction activity, providing a new approach for photocatalytic CO2 conversion.
Developing highly active and stable photocatalysts is a crucial endeavor to harvest valuable carbon-based fuels and feedstocks for photocatalytic CO2 conversion. The excellent photocatalysts must satisfy the thermodynamic condition for the redox reaction and possess the accelerated reaction kinetics. Here, we report a strategy using grain-boundary surface terminations and oxygen vacancies to synergistically and selectively boost photocatalytic CO2 reduction activity. Thereinto, grain boundaries as bulk defects create high-energy surfaces by stabilizing dislocations that are kinetically trapped for catalysis owing to the lattice strain of the photocatalyst. Oxygen vacancies are used to tailor the band structure and enhance the adsorption ability of reactants or intermediates. High-energy surface structures arisen from these bulk defects may be more resistant to the relaxation effect, resulting in excellent stability for photocatalytic CO2 reduction. In light of the anticipated increase for photocatalytic CO2 reduction activity, this work provides a strategy for broader exploitation of bulk defects in heterogeneous catalysis.
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