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Enhancement in Photocatalytic H2O2 Production over g-C3N4 Nanostructures: A Collaborative Approach of Nitrogen Deficiency and Supramolecular Precursors
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-03-15 , DOI: 10.1021/acssuschemeng.0c08884
Hossein Fattahimoghaddam 1 , Tahereh Mahvelati-Shamsabadi 1 , Byeong-Kyu Lee 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-03-15 , DOI: 10.1021/acssuschemeng.0c08884
Hossein Fattahimoghaddam 1 , Tahereh Mahvelati-Shamsabadi 1 , Byeong-Kyu Lee 1
Affiliation
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The poor selectivity and activity of the photocatalysts developed has hindered the photocatalytic production of hydrogen peroxide (H2O2). Therefore, modification techniques need to be pursued to improve the selectivity and activity of photocatalysts toward the two-electron oxygen reduction reaction. In this study, homogeneous self-modification by nitrogen vacancies is adopted as an efficient technique to narrow the band gap and induce the mid-gap states in the nanostructures of g-C3N4 synthesized by cyanuric acid–melamine supramolecular adducts. The presence of the vacancies in the structure and their respective effects on the optoelectronic features of the catalysts were thoroughly investigated by different characterizations. The optimized photocatalyst showed greatly improved H2O2 production of 200 μM under 1 h visible light irradiation, as compared with that of the bulk (35 μM) and the pristine nanostructured sample (85 μM), with acceptable reusability. This study also provides a new perspective on devising synergistic approaches to modify the performance of supramolecular-based carbon nitride photocatalysts.
中文翻译：
通过gC 3 N 4纳米结构增强光催化H 2 O 2的产生：氮缺乏和超分子前体的协同方法
所开发的光催化剂的差的选择性和活性阻碍了过氧化氢（H 2 O 2）的光催化生产。因此，需要寻求改性技术以提高光催化剂对二电子氧还原反应的选择性和活性。在这项研究中，通过氮空位的均匀自修饰被用作一种有效的技术，以缩小带隙并在gC 3 N 4的纳米结构中诱导中带隙态。由氰尿酸-三聚氰胺超分子加合物合成。通过不同的表征彻底研究了结构中空位的存在及其对催化剂光电特性的影响。经过优化的光催化剂显示出在1 h可见光照射下，H 2 O 2的产生显着改善，与本体（35μM）和原始纳米结构样品（85μM）相比，H 2 O 2的产生具有可重复使用性。这项研究还为设计协同方法以修饰超分子基氮化碳光催化剂的性能提供了新的视角。
更新日期：2021-03-29
中文翻译：
通过gC 3 N 4纳米结构增强光催化H 2 O 2的产生：氮缺乏和超分子前体的协同方法
所开发的光催化剂的差的选择性和活性阻碍了过氧化氢（H 2 O 2）的光催化生产。因此，需要寻求改性技术以提高光催化剂对二电子氧还原反应的选择性和活性。在这项研究中，通过氮空位的均匀自修饰被用作一种有效的技术，以缩小带隙并在gC 3 N 4的纳米结构中诱导中带隙态。由氰尿酸-三聚氰胺超分子加合物合成。通过不同的表征彻底研究了结构中空位的存在及其对催化剂光电特性的影响。经过优化的光催化剂显示出在1 h可见光照射下，H 2 O 2的产生显着改善，与本体（35μM）和原始纳米结构样品（85μM）相比，H 2 O 2的产生具有可重复使用性。这项研究还为设计协同方法以修饰超分子基氮化碳光催化剂的性能提供了新的视角。
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