高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (12): 20230357.doi: 10.7503/cjcu20230357

• 物理化学 • 上一篇    下一篇

p-n型NiWO4/ZnIn2S4异质结光解水析氢性能

闫爱华1,2, 高埜2, 张晓辉2, 黄飞2,3(), 张同洋2, 张吉旭2, 赵文学2   

  1. 1.中国矿业大学低碳能源与动力工程学院
    2.材料与物理学院, 徐州 221116
    3.中国矿业大学碳中和研究院, 徐州 221008
  • 收稿日期:2023-08-07 出版日期:2023-12-10 发布日期:2023-10-10
  • 通讯作者: 黄飞 E-mail:huangfei7804@163.com
  • 基金资助:
    国家自然科学基金(52002399);徐州市科技计划项目(KC21025)

Photocatalytic Water Splitting Performance of p-n-Type NiWO4/ZnIn2S4 Heterojunctions

YAN Aihua1,2, GAO Ye2, ZHANG Xiaohui2, HUANG Fei2,3(), ZHANG Tongyang2, ZHANG Jixu2, ZHAO Wenxue2   

  1. 1.School of Low?carbon Energy and Power Engineering
    2.School of Materials and Physics,China University of Mining and Technology,Xuzhou 221116,China
    3.Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou 221008,China
  • Received:2023-08-07 Online:2023-12-10 Published:2023-10-10
  • Contact: HUANG Fei E-mail:huangfei7804@163.com
  • Supported by:
    the National Natural Science Foundation of China(52002399);the Xuzhou Science and Technique Program, China(KC21025)

摘要:

采用水热/水浴两步法构筑了p-n型NiWO4(NWO)/ZnIn2S4(ZIS)异质结, 研究了不同含量的NWO对ZIS物相组分、 形貌结构、 能带结构、 光谱吸收及光解水析氢性能等的影响, 并采用一系列表征手段探讨了NWO/ZIS异质结的光催化机理. 结果表明, 负载NWO后, ZIS物相组分及形貌结构未发生显著变化, 两种材料界面接触紧密且分布均匀; 在可见光辐照下, NWO/ZIS异质结光解水析氢性能得到了显著提升, 其中, 最佳样品NWO-35/ZIS析氢速率达到5204.8 μmol·g-1·h-1, 为纯相ZIS(1566.4 μmol·g-1·h-1)的3.32倍; 循环实验结果表明, NWO/ZIS样品具有很好的光稳定性; 能带结构和光电子动力学表征结果证实了p-n型异质结内建电场驱动的光生载流子的传输机制.

关键词: ZnIn2S4, NiWO4, p-n型异质结, 内建电场, 光解水析氢

Abstract:

In this paper, p-n-type NiWO4(NWO)/ZnIn2S4(ZIS) heterojunctions were constructed by a two-step hydrothermal/water bath method. The influence of different loading amounts for NWO on the composition, morphology, band structure, light absorption and photocatalytic water splitting performance was investigated. The photocatalytic mechanism of NWO/ZIS system was also discussed by a series of advanced characterization tools. The results show that the composition and morphology of ZIS don’t change significantly after loading NWO. Furthermore, the interface between the two materials contacts intimately and the two materials distribute uniformly. Consequently, the hydrogen evolution performance of NWO/ZIS has been markedly improved under the visible-light irradiation. Therein, the highest hydrogen production rate for NWO-35/ZIS samples is 5204.8 μmol·g-1·h-1, which is approximately 3.32 times higher than that of pure ZIS(1566.4 μmol·g-1·h-1). The cyclic experiment shows that NWO/ZIS system has excellent photostability. The band calculation and photoelectric dynamic results confirm the photogenerated charge transport mechanism driven by p-n-type internal electric field.

Key words: ZnIn2S4, NiWO4, p-n-Type heterojunction, Internal electric field, Photocatalytic water splitting into hydrogen production

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