L-Cysteine capped Mo2C/Zn0.67Cd0.33S heterojunction with intimate covalent bonds enables efficient and stable H2-Releasing photocatalysis
L-Cysteine capped Mo2C/Zn0.67Cd0.33S heterojunction with intimate covalent bonds enables efficient and stable H2-Releasing photocatalysis
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L-半胱氨酸封端的 Mo2C/Zn0.67Cd0.33S 异质结具有紧密的共价键，可实现高效稳定的释氢光催化
DOI：
10.1016/j.cej.2021.132628
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发表时间：
2022-01
影响因子：
15.1
通讯作者：
Yongsheng Yu
中科院分区：
文献类型：
--
作者：
Xin Zhang;Fenyang Tian;Manyi Gao;Weiwei Yang;Yongsheng Yu
ZnxCd 1-xS是一种很有前途的光催化剂，在500 nm范围内具有很宽的可见光吸收，但其稳定性和活性仍面临着巨大的挑战。本文采用L-半胱氨酸修饰的Mo 2C（L-Mo 2C）纳米片锚Zn 2 +/Cd 2+原位生长Zn0.67Cd0.33S纳米材料，通过紧密的Mo-S共价键构建高效稳定的L-Mo 2C/Zn0.67Cd0.33S异质结，用于光催化析氢反应（HER）。本工作不仅通过构建强L-Mo 2C/Zn 0. 67 Cd 0. 33 S肖特基异质结来抑制Zn 0. 67 Cd 0. 33 S纳米材料的光腐蚀，而且通过产生强内电场来大大提高电荷转移效率。结果表明，优化后的L-Mo 2C/Zn0.67Cd0.33S-5异质结在可见光照射下连续24 h，其HER率为34.66 mmol h−1g− 1，是未加帽的Mo 2C/Zn0.67Cd0.33S-5和未加帽的Zn0.67Cd0.33S-5的4.8倍和1.23倍.该研究揭示了Mo 2C在光催化HER中的作用，为抑制Zn 0. 67 Cd 0. 33 S基复合材料的光腐蚀提供了一种新的方法。
ZnxCd1-xS is a prospective photocatalyst with wide visible-light absorption up to 500 nm, but its stability and activity are still facing huge challenges. Herein, L-Cysteine capped Mo2C (L-Mo2C) nanoplates were used to anchor Zn2+/Cd2+to in-situ grow Zn0.67Cd0.33S nanomaterial for constructing a highly efficient and robust L-Mo2C/Zn0.67Cd0.33S heterojunction through intimate Mo-S covalent bonds for photocatalytic hydrogen evolution reaction (HER). This work not only suppresses the photo-corrosion of Zn0.67Cd0.33S nanomaterial by the construction of strong L-Mo2C/Zn0.67Cd0.33S Schottky heterojunction but also greatly improves the charge transfer efficiency by generating a strong internal electric field. As a result, the optimized L-Mo2C/Zn0.67Cd0.33S-5 heterojunction exhibits an enhanced HER rate of 34.66 mmol h−1g−1without an obvious decrease for continuous 24 h under visible irradiation, which is 4.8 times and 1.23 times than that of pristine Zn0.67Cd0.33S and uncapped Mo2C/Zn0.67Cd0.33S-5. This research highlights the role of Mo2C in photocatalytic HER, which provides a novel method to suppress the photo-corrosion of Zn0.67Cd0.33S-based composite.
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