Journal
ACS CATALYSIS
Volume 12, Issue 8, Pages 4560-4570Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c00815
Keywords
CO2 reduction; graphitic carbon nitride; heterogeneous catalysis; photocatalysis; self-decomposition
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Funding
- National Natural Science Foundation of China [22176029, 21822601]
- Sichuan Natural Science Foundation for Distinguished Scholars [2021JDJQ0006]
- Fundamental Research Funds for the Central Universities [ZYGX2019Z021]
- State Scholarship Fund of China Scholarship Council [202009225030]
- Shanghai Tongji Gao Tingyao Environmental Science & Technology Development Foundation
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This study reports the rapid self-decomposition of graphitic carbon nitride (g-C3N4) during gas-solid photocatalytic reaction, with the products including CO, CO2, NO2, and NO2-/NO3-. The research reveals the influence of adsorbed hydroxyl groups and photogenerated charge carriers on the instability of the catalyst, and demonstrates that self-decomposition reaction is more thermodynamically favorable than CO2 reduction reaction.
We report direct evidence of the rapid self-decomposition of graphitic carbon nitride (g-C3N4), a popularphoto (electro) catalyst, during the gas-solid photocatalytic reaction. Crucially, the average rate of CO production from the light-induced self-decomposition of g-C3N4 in Ar is almost equal to that in a CO2 atmosphere, and the products of the self-decomposition include CO, CO2,NO2, and NO2-/NO3-. Using experimental and theoretical studies, we reveal that the chemical instability of g-C3N4 is related to the adsorbed hydroxyl groups(OHads) on the catalyst surface. Specifically, the electronicinteractions between OHads and g-C3N4 reduce the stability of the C-N C bonds, and photogenerated charge carriers attack the structural units of g-C3N4, leading to rapid decomposition. Theoretical calculations indicate that self-decomposition reaction is more thermodynamically favorable than CO2 reduction reaction. Overall, these findings demonstrate the importance of catalyst self-decomposition and the need to fully consider the products from catalyst instability when evaluating the gas-solid photocatalytic redox reaction performance.
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