Construction of ultrathin 2D/2D g-C3N4/In2Se3 heterojunctions with high-speed charge transfer nanochannels for promoting photocatalytic hydrogen production
Construction of ultrathin 2D/2D g-C3N4/In2Se3 heterojunctions with high-speed charge transfer nanochannels for promoting photocatalytic hydrogen production
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构建具有高速电荷转移纳米通道的超薄2D/2D g-C3N4/In2Se3异质结以促进光催化制氢
DOI：
10.1016/j.apsusc.2020.146858
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发表时间：
2020-10
影响因子：
6.7
通讯作者：
An Changsheng
中科院分区：
文献类型：
--
作者：
Zhang Shumin;Xu Difa;Chen Xiaohua;Zhang Shiying;An Changsheng
增强光致载流子分离和界面电荷转移是提高g-C3N4基催化剂光催化析氢效率的紧迫问题。为此，设计了二维（2D）g-C3N4和In2Se3（g-C3N4/In2Se3-X）的二元纳米杂化异质结并将其用作可见光光催化剂。得益于紧密的2D/2D异质结界面和超薄In2Se3纳米片的自发极化特性，g-C3N4/In2Se3异质结可以产生大量的高速电荷传输通道，并且In2Se3的垂直本征电场将显着抑制光生电荷的复合。利用这些特性，2D/2D g-C3N4/In2Se3异质结纳米片表现出显着增强的可见光驱动光催化活性，最佳的g-C3N4/In2Se3异质结纳米片的析氢速率为4.8 mmol·g−1·h−1，大大高于纯g-C3N4/In2Se3异质结纳米片的析氢速率。 g-C3N4(0.94 mmol·g−1·h−1) 和 In2Se3。对光催化机理和界面电荷转移的高速通道进行了研究和讨论。这项工作为设计和构建高效分离光生载流子的光催化剂提供了可能。
Reinforcing the photo-induced carrier separation and interfacial charge transfer are the pressing issue to elevate the photocatalyic hydrogen evolution efficiency of g-C3N4-based catalysts. To this end, a binary nanohybrid heterojunction of two-dimensional (2D) g-C3N4and In2Se3(g-C3N4/In2Se3-X) was designed and used as the visible light photocatalyst. Benefited from the intimate 2D/2D heterojunction interface and the spontaneous polarization characteristic of ultrathin In2Se3nanosheet, the g-C3N4/In2Se3heterojunction could generate numerous high-speed charge transfer channels, and the vertical intrinsic electric field of In2Se3would considerably inhibit the recombination of photogenerated charge. By taking advantage of these features, the 2D/2D g-C3N4/In2Se3heterojunction nanosheets exhibited remarkably intensified visible-light-driven photocatalytic activity, the optimal g-C3N4/In2Se3heterojunction nanosheets exhibit a hydrogen evolution rate of 4.8 mmol·g−1·h−1that greatly higher than pure g-C3N4(0.94 mmol·g−1·h−1) and In2Se3. The photocatalytic mechanism and high-speed channels of interface charge transfer were investigated and discussed. This work can provide a possibility for design and construction of photocatalysts with high efficient separation of photoinduced carriers.
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