Assemble of Ti3C2 MXene into ZnIn2S4-NiSe2 S-Scheme Heterojunction with multiple charge transfer channels for Accelerated Photocatalytic H2 Generation
Assemble of Ti3C2 MXene into ZnIn2S4-NiSe2 S-Scheme Heterojunction with multiple charge transfer channels for Accelerated Photocatalytic H2 Generation
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DOI：
10.1016/j.cej.2022.137488
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发表时间：
2022-06
影响因子：
15.1
通讯作者：
Jun-Chuan Bai;Weiling Chen;Lei Hao;Rongchen Shen;Peng Zhang;Neng Li;Xin Li
中科院分区：
文献类型：
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作者：
Jun-Chuan Bai;Weiling Chen;Lei Hao;Rongchen Shen;Peng Zhang;Neng Li;Xin Li
探索有效的光催化剂来促进水分解成太阳能燃料仍然是一个巨大的挑战，因为快速电荷重组。在此基础上，合理制备了具有多个内电场锚定在Ti3C2MXene （MX）上的ZnIn2S4(ZIS)- nise2s方案异质结，用于有效的光催化制氢。在Schottky势垒和S-scheme异质结的强烈协同作用下，优化后的光催化剂在450 nm单色光下的析氢速率最高，为23.51 mmol/g/h，表观量子产率为10.9%，约为纯ZnIn2S4的23.51倍。znin2s4和MX之间形成肖特基势垒可以实现电子通过肖特基结界面从ZIS向MX的转移，而s方案异质结中的内部电场允许电子从nise2向ZIS的迁移。因此，在ZnIn2S4、NiSe2和MX之间构建了多个动力学活跃的内部电场，有利于电荷分离，从而分别构建了富电子的h2 -演化位点（MX）和空穴积累氧化位点（NiSe2）。期望本研究中s -图式异质结与Schottky势垒的耦合可以更好地理解促进H2evolution的高效三元杂化光催化剂的合理设计。
Exploring effective photocatalysts to promote water splitting into solar fuels remains a great challenge due to the fast charge recombination. Herein, the ZnIn2S4(ZIS)-NiSe2S-scheme heterojunctions anchored on Ti3C2MXene (MX) with multiple internal electric fields were rationally fabricated for effective photocatalytic H2generation. Indeed, under the intense synergy between Schottky barrier and S-scheme heterojunctions, the optimized photocatalyst exhibits the highest hydrogen evolution rate of 23.51 mmol/g/h with an apparent quantum yield of 10.9% at 450 nm monochromatic light, which is about 23.51-fold of the pure ZnIn2S4. The formation of Schottky barrier between ZnIn2S4and MX could achieve the transfer of the electrons from ZIS to MX via the Schottky-junction interface, while an internal electric field in S-scheme heterojunctions allows the migration of electrons from NiSe2to ZIS. In this regard, multiple internal electric fields with vibrant kinetics are constructed between the ZnIn2S4, NiSe2and MX, which facilitates the favorable charge separation, thus leading to the isolated construction of electron-enriched H2-evolution sites (MX) and hole-accumulated oxidation sites (NiSe2), respectively. It is expected that the coupling of S-scheme heterojunctions and Schottky barrier in this work could provide a better understanding of the rational design of highly-efficient ternary hybrid photocatalysts for promoted H2evolution.