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Anchoring Ni single atoms on sulfur-vacancy-enriched ZnIn2S4 nanosheets for boosting photocatalytic hydrogen evolution
Journal of Energy Chemistry ( IF 13.1 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.jechem.2020.10.030
Jingwen Pan , Gongxin Zhang , Zhongjie Guan , Qianyu Zhao , Guoqiang Li , Jianjun Yang , Qiuye Li , Zhigang Zou

Structure manipulation of photocatalysts at an atomic scale is a promising way to improve its photocatalytic performance. Herein, we realize the anchoring of single Ni atoms on the ZnIn2S4 nanosheets with rich sulfur vacancies. Experimental results demonstrate that single Ni atoms induce the formation of Ni-O-M (Zn/In) atomic interface, which can efficiently promote the carriers separation and prolong the carrier life time. In addition, in situ electron spin resonance spectroscopy (ESR) confirms that the single Ni atoms act as an electron trapping center for protons reduction. As a result, the single Ni atoms decorated ZnIn2S4 nanosheets with rich sulfur vacancies (Ni/ZnIn2S4-RVs) shows a hydrogen evolution rate up to 89.4 μmol h-1, almost 5.7 and 2.3 times higher compared to that of ZnIn2S4 nanosheets with poor sulfur vacancies and rich sulfur vacancies (denoted as ZnIn2S4-PVs and ZnIn2S4-RVs). This work opens up a new perspective manipulating the single-atom cocatalyst and sulfur vacancy on sulfide supports for improving photocatalytic hydrogen evolution.



中文翻译:

在富硫空位的ZnIn 2 S 4纳米片上固定Ni单原子,以促进光催化氢的释放

在原子尺度上对光催化剂进行结构操作是改善其光催化性能的一种有前途的方法。在这里,我们实现了单个Ni原子在具有丰富硫空位的ZnIn 2 S 4纳米片上的锚固。实验结果表明,单个Ni原子诱导Ni-OM(Zn / In)原子界面的形成,可以有效地促进载流子的分离并延长载流子的寿命。此外,原位电子自旋共振光谱法(ESR)证实单个Ni原子充当质子还原的电子俘获中心。结果,单个镍原子装饰了具有丰富硫空位的ZnIn 2 S 4纳米片(Ni / ZnIn 2 S 4 -RVs)显示出的氢释放速率高达89.4μmolh -1,与硫空位差和硫空位丰富的ZnIn 2 S 4纳米片(表示为ZnIn 2 S 4 -PV s和ZnIn)相比,分别高出5.7和2.3倍2 S 4 -RV s)。这项工作为操纵单原子助催化剂和硫化物载体上的硫空位改善了光催化氢的释放开辟了新的视角。

更新日期:2020-11-02
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