Ti3C2 Mxene/porous g-C3N4 interfacial Schottky junction for boosting spatial charge separation in photocatalytic H2O2 production
Ti3C2 Mxene/porous g-C3N4 interfacial Schottky junction for boosting spatial charge separation in photocatalytic H2O2 production
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Ti3C2 Mxene/多孔 g-C3N4 界面肖特基结用于促进光催化 H2O2 生产中的空间电荷分离
DOI：
10.1016/j.apcatb.2019.117956
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发表时间：
2019-12
期刊：
影响因子：
--
通讯作者：
Donghui He
中科院分区：
文献类型：
--
作者：
Yang Yang;Zhuotong Zeng;Guangming Zeng;Danlian Huang（黄丹莲;通讯作者）;Rong Xiao;Chen Zhang;Chengyun Zhou;Weiping Xiong;Wenjun Wang;Min Cheng;Wenjing Xue;Hai Guo;Xiang Tang;Donghui He
开发高效的光催化剂用于生产过氧化氢（H2 O2）是实现太阳能-化学能转换的一个很有前途的策略。石墨碳氮化物（g-C3 N4）在光催化制备H2 O2方面具有巨大的潜力，但其电荷分离缓慢的缺点影响了其光催化性能。本文采用静电自组装方法构建了由Ti 3C 2纳米片和多孔g-C3 N4纳米片（TC/pCN）组成的界面肖特基结，显著提高了空间电荷分离，促进了分子氧的活化，从而产生H2 O2.在可见光照射下（λ > 420 nm），TC/pCN-2的H2 O2产率最高（2.20 μmol L− 1 min −1），是多孔g-C3 N4的2.1倍。超氧阴离子自由基检测和旋转圆盘电极测量结果表明，在该光催化过程中，氧的两步单电子还原是主要的反应步骤.这种增强的光催化性能归因于肖特基结的形成和随后在界面处形成的内建电场，其加速了空间电荷分离并抑制了电荷复合。本工作为深入理解光催化产H2 O2的机理提供了理论依据，并为设计高活性的光催化产H2 O2材料提供了思路。
The development of efficient photocatalysts for the production of hydrogen peroxide (H2O2) is a promising strategy to realize solar-to-chemical energy conversion. Graphitic carbon nitride (g-C3N4) presents giant potential for photocatalytic H2O2production, but the sluggish charge separation depresses its photocatalytic performance. Herein, an interfacial Schottky junction composed of Ti3C2nanosheets and porous g-C3N4nanosheets (TC/pCN) is constructed by a facile electrostatic self-assembly route to significantly boost the spatial charge separation to promote the activation of molecular oxygen for H2O2production. As the optimal sample, TC/pCN-2 possesses the highest H2O2production rate (2.20 μmol L−1min−1) under visible light irradiation (λ > 420 nm), which is about 2.1 times than that of the porous g-C3N4. The results of superoxide radical detection and rotating disk electrode measurement suggest that the two-step single-electron reduction of oxygen is the predominant reaction step during this photocatalytic H2O2production process. The enhanced photocatalytic performance is ascribed to the formation of Schottky junction and subsequent built-in electric field at their interface, which accelerate the spatial charge separation and restrain the charge recombination. This work provides an in-depth understanding of the mechanism of photocatalytic H2O2production, and gives ideas for the design of highly active materials for photocatalytic H2O2production.
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