Ionothermally synthesized S-scheme isotype heterojunction of carbon nitride with significantly enhanced photocatalytic performance for hydrogen evolution and carbon dioxide reduction
Ionothermally synthesized S-scheme isotype heterojunction of carbon nitride with significantly enhanced photocatalytic performance for hydrogen evolution and carbon dioxide reduction
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DOI：
10.1016/j.carbon.2022.09.071
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Youji Li
中科院分区：
文献类型：
--
作者：
Senpei Tang;Shitao Yang;Yuanyuan Chen;Yi Yang;Zhenhui Li;Lin Zi;Yin Liu;Yingchun Wang;Zhiping Li;Zaihui Fu;Youji Li
Graphitic phase carbon nitride (CN) is a safe and green photocatalyst, but the activity of the pristine CN photocatalyst is still unsatisfactory due to the significant recombination of photogenerated charges, so it is still.challenging to realize the practical application of CN for photocatalysis. Herein, we report that a mechanical.mixture consisting of pre-thermally polymerized melamine (Me) and 3-amino-1,2,4-triazole (AT) can be transformed into a crystalline isotype heterojunction material (ISCNMT) by ionothermal synthesis. A series of characterizations and photocatalytic tests demonstrate that the polymerizability, porosity and photoelectric.conversion efficiency of the constructed ISCNMT have been improved. The photogenerated charge pairs of the.ISCNMT can migrate in S-scheme, indicating that ISCNMT retains the strongest reduction capacity and greatly.improving the separation efficiency of photogenerated charge pairs. As a result, the ISCNMT exhibits outstanding.performance. Its catalytic efficiency for visible light-triggered hydrogen evolution from water can reach 9.64.mmol⋅g− 1⋅h− 1 with an apparent quantum efficiency (AQE) of 26.23%, which is 21 or 45 times higher than that of.the carbon nitride material directly polymerized by Me or AT (CNM or CNT). In addition, the ISCNMT has a.catalytic efficiency of 15.64 μmol⋅g− 1⋅h− 1 for photocatalysis CO2 reduction under water vapor. This work provides a facile pathway for designing S-scheme isotype heterojunction CN-based photocatalysts for the efficient.conversion of solar energy.
