Formation of noble-metal-free 2D/2D ZnmIn2Sm+3 (m=1, 2, 3)/MXene Schottky heterojunction as an efficient photocatalyst for hydrogen evolution
Formation of noble-metal-free 2D/2D ZnmIn2Sm+3 (m=1, 2, 3)/MXene Schottky heterojunction as an efficient photocatalyst for hydrogen evolution
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形成不含贵金属的 2D/2D ZnIn2Sm 3 (m=1, 2, 3)/MXene 肖特基异质结作为高效光催化剂析氢
DOI：
10.1016/j.cej.2021.130170
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发表时间：
2021
影响因子：
15.1
通讯作者：
Yuhui Chen
中科院分区：
文献类型：
--
作者：
Man Ou;Jinke Li;Yuanzhao Chen;Shipeng Wan;Shulin Zhao;Jing Wang;Yuping Wu;Caichao Ye;Yuhui Chen
三元硫族化合物ZnmIn2S3+m（m = 1-3）在光催化析氢反应中具有很大的应用潜力，但需克服其太阳能制氢效率低和助催化剂昂贵的缺点。本文采用MXene （Ti3C2Tx）纳米片作为无贵金属的助催化剂底物，支持其超薄ZnmIn2S3+纳米片的原位生长，加速了电荷分离和迁移，具有较大的表面积和亲水性。特别是在ZnmIn2S3+m/MXene界面处形成的Schottky结诱导电子及时转移到MXene纳米片上，抑制了回流，进一步促进了光生载流子的分离。DFT计算和实验结果进一步证实了光催化析氢的机理。结果表明，2D/2D ZnmIn2S3+m/MXene在可见光照射下表现出良好的稳定性和出色的h2产率，特别是Zn2In2S5/MXene (MXene的2.5 wt%)，比原始Zn2In2S5高出2.67倍。
Ternary chalcogenides ZnmIn2S3+m(m = 1–3) has great potential in photocatalytic hydrogen evolution reaction if their low solar-to-hydrogen conversion efficiency and expensive co-catalyst assistance can be overcome. Herein, we adopt MXene (Ti3C2Tx) nanosheets as the noble-metal-free cocatalyst substrate to support thein situgrowth of ultrathin ZnmIn2S3+mnanosheets, expediting charge separation and mobility, large surface area surface and hydrophilicity. Particularly, the Schottky junction formed at ZnmIn2S3+m/MXene interface induces the electrons transfer to MXene nanosheets timely and inhibits the backflow, further promote the separation of photogenerated charge carriers. This mechanism of the photocatalytic H2evolution was further evidenced by the DFT calculations and experimental results. As a result, 2D/2D ZnmIn2S3+m/MXene exhibits good stability and an outstanding H2yield under visible light irradiation, especially for Zn2In2S5/MXene (2.5 wt% of MXene), which is 2.67 times higher than that of pristine Zn2In2S5.