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Efficient Photocatalytic Hydrogen Evolution via Band Alignment Tailoring: Controllable Transition from Type‐I to Type‐II
Small ( IF 13.0 ) Pub Date : 2017-09-12 , DOI: 10.1002/smll.201702163 Zhongzhou Cheng 1, 2 , Fengmei Wang 2, 3 , Tofik Ahmed Shifa 2, 3 , Chao Jiang 1 , Quanlin Liu 1 , Jun He 2
Small ( IF 13.0 ) Pub Date : 2017-09-12 , DOI: 10.1002/smll.201702163 Zhongzhou Cheng 1, 2 , Fengmei Wang 2, 3 , Tofik Ahmed Shifa 2, 3 , Chao Jiang 1 , Quanlin Liu 1 , Jun He 2
Affiliation
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Considering the sizable band gap and wide spectrum response of tin disulfide (SnS2), ultrathin SnS2 nanosheets are utilized as solar‐driven photocatalyst for water splitting. Designing a heterostructure based on SnS2 is believed to boost their catalytic performance. Unfortunately, it has been quite challenging to explore a material with suitable band alignment using SnS2 nanomaterials for photocatalytic hydrogen generation. Herein, a new strategy is used to systematically tailor the band alignment in SnS2 based heterostructure to realize efficient H2 production under sunlight. A Type‐I to Type‐II band alignment transition is demonstrated via introducing an interlayer of Ce2S3, a potential photocatalyst for H2 evolution, between SnS2 and CeO2. Subsequently, this heterostructure demonstrates tunability in light absorption, charge transfer kinetics, and material stability. The optimized heterostructure (SnS2–Ce2S3–CeO2) exhibits an incredibly strong light absorption ranging from deep UV to infrared light. Significantly, it also shows superior hydrogen generation with the rate of 240 µmol g−1 h−1 under the illumination of simulated sunlight with a very good stability.
中文翻译：
通过能带对准裁切技术有效地释放光催化氢：从I型到II型的可控转变
考虑到二硫化锡（SnS 2）的较大带隙和宽光谱响应，超薄SnS 2纳米片被用作太阳能驱动的光分解水催化剂。据信设计基于SnS 2的异质结构可提高其催化性能。不幸的是，使用SnS 2纳米材料探索具有合适能带取向的材料用于光催化制氢一直是非常具有挑战性的。在本文中，使用一种新策略来系统地调整基于SnS 2的异质结构中的能带排列，以在阳光下实现高效的H 2产生。通过引入Ce的中间层演示了I型到II型频带对准过渡2 S 3是在SnS 2和CeO 2之间释放H 2的潜在光催化剂。随后，这种异质结构在光吸收，电荷转移动力学和材料稳定性方面显示出可调谐性。优化的异质结构（SnS 2 -Ce 2 S 3 -CeO 2）表现出令人难以置信的强光吸收能力，范围从深紫外线到红外光。值得注意的是，在模拟阳光的照射下，它还显示出优异的氢生成速率，为240 µmol g -1 h -1，具有非常好的稳定性。
更新日期：2017-09-12
中文翻译：
通过能带对准裁切技术有效地释放光催化氢：从I型到II型的可控转变
考虑到二硫化锡（SnS 2）的较大带隙和宽光谱响应，超薄SnS 2纳米片被用作太阳能驱动的光分解水催化剂。据信设计基于SnS 2的异质结构可提高其催化性能。不幸的是，使用SnS 2纳米材料探索具有合适能带取向的材料用于光催化制氢一直是非常具有挑战性的。在本文中，使用一种新策略来系统地调整基于SnS 2的异质结构中的能带排列，以在阳光下实现高效的H 2产生。通过引入Ce的中间层演示了I型到II型频带对准过渡2 S 3是在SnS 2和CeO 2之间释放H 2的潜在光催化剂。随后，这种异质结构在光吸收，电荷转移动力学和材料稳定性方面显示出可调谐性。优化的异质结构（SnS 2 -Ce 2 S 3 -CeO 2）表现出令人难以置信的强光吸收能力，范围从深紫外线到红外光。值得注意的是，在模拟阳光的照射下，它还显示出优异的氢生成速率，为240 µmol g -1 h -1，具有非常好的稳定性。
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