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Enhanced Photocatalytic H2O2 Production over Carbon Nitride by Doping and Defect Engineering
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-11-24 , DOI: 10.1021/acscatal.0c03359 Shuai Wu 1 , Hongtao Yu 1 , Shuo Chen 1 , Xie Quan 1
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-11-24 , DOI: 10.1021/acscatal.0c03359 Shuai Wu 1 , Hongtao Yu 1 , Shuo Chen 1 , Xie Quan 1
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Photocatalytic production of H2O2 from the reduction of O2 by semiconductor photocatalysts (e.g., graphitic carbon nitride, C3N4) has been regarded as an alternative for small-scale decentralized H2O2 production. However, the efficiency of pristine C3N4 photocatalysts is still limited by the narrow light absorption range and rapid charge recombination. Here, we presented a facile approach to simultaneously enhance the light absorption and promote the charge separation by introducing alkali metal dopants and N vacancies on C3N4. The introduction of alkali metal dopants and N vacancies successfully broadened the light absorption range, reduced the band gap from 2.85 to 2.63 eV, and greatly inhibited the charge recombination. The synergistic effect of doping and defect resulted in the improvement of photocatalytic performance with a H2O2 production rate of 10.2 mmol/h/g, which is 89.5 times that of pristine C3N4. Thus, this work not only gives insights into the synergistic effect of doping and defect for simultaneously manipulating the light absorption and charge separation processes but also inspires further work to develop more efficient photocatalysts for H2O2 production.
中文翻译：
掺杂和缺陷工程技术在氮化碳上增强的光催化H 2 O 2的生产
由半导体光催化剂（例如，石墨碳氮化物，C 3 N 4）还原O 2而产生的H 2 O 2光催化生产已被视为小规模分散H 2 O 2生产的替代方法。然而，原始的C 3 N 4光催化剂的效率仍然受到狭窄的光吸收范围和快速的电荷重组的限制。在这里，我们提出了一种简便的方法，通过在C 3 N 4上引入碱金属掺杂剂和N空位来同时增强光吸收和促进电荷分离。引入碱金属掺杂剂和N空位成功地拓宽了光吸收范围，将带隙从2.85 eV减小到2.63 eV，并极大地抑制了电荷复合。掺杂和缺陷的协同作用导致光催化性能的提高，H 2 O 2的产生速率为10.2 mmol / h / g，是原始C 3 N 4的89.5倍。因此，这项工作不仅为同时控制光吸收和电荷分离过程的掺杂和缺陷的协同作用提供了见识，而且还激发了进一步的工作来开发用于生产H 2 O 2的更有效的光催化剂。
更新日期：2020-12-18
中文翻译：
掺杂和缺陷工程技术在氮化碳上增强的光催化H 2 O 2的生产
由半导体光催化剂（例如，石墨碳氮化物，C 3 N 4）还原O 2而产生的H 2 O 2光催化生产已被视为小规模分散H 2 O 2生产的替代方法。然而，原始的C 3 N 4光催化剂的效率仍然受到狭窄的光吸收范围和快速的电荷重组的限制。在这里，我们提出了一种简便的方法，通过在C 3 N 4上引入碱金属掺杂剂和N空位来同时增强光吸收和促进电荷分离。引入碱金属掺杂剂和N空位成功地拓宽了光吸收范围，将带隙从2.85 eV减小到2.63 eV，并极大地抑制了电荷复合。掺杂和缺陷的协同作用导致光催化性能的提高，H 2 O 2的产生速率为10.2 mmol / h / g，是原始C 3 N 4的89.5倍。因此，这项工作不仅为同时控制光吸收和电荷分离过程的掺杂和缺陷的协同作用提供了见识，而且还激发了进一步的工作来开发用于生产H 2 O 2的更有效的光催化剂。
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