化工学报 ›› 2022, Vol. 73 ›› Issue (4): 1575-1584.doi: 10.11949/0438-1157.20211147

• 催化、动力学与反应器 • 上一篇    下一篇

一步水热法制备电解水析氧反应Ni3S2@Mo2S3高效催化剂

赵娟(),吴梦成,雷惊雷,李凌杰()   

  1. 重庆大学化学化工学院，重庆 400044
  • 收稿日期:2021-08-12 修回日期:2022-03-21 出版日期:2022-04-05 发布日期:2022-04-25
  • 通讯作者: 李凌杰 E-mail:15182935663@163.com;ljli@cqu.edu.cn
  • 作者简介:赵娟（1997—），女，硕士研究生，15182935663@163.com
  • 基金资助:
    国家自然科学基金项目(22072008);重庆大学大型仪器基金项目

One-step hydrothermal method toward preparation of Ni3S2@Mo2S3 high-efficient catalyst for oxygen evolution reaction in water electrolysis

Juan ZHAO(),Mengcheng WU,Jinglei LEI,Lingjie LI()   

  1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
  • Received:2021-08-12 Revised:2022-03-21 Published:2022-04-05 Online:2022-04-25
  • Contact: Lingjie LI E-mail:15182935663@163.com;ljli@cqu.edu.cn

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摘要：

采用一步水热法，由泡沫钼镍合金同时提供钼源和镍源在泡沫钼镍合金表面原位制备了Ni3S2@Mo2S3，并将其直接作为自支撑电极用于催化碱性介质中的电解水析氧反应（OER）。利用多种表征测试技术研究了样品的形貌、组成、OER电催化性能，结果显示：Ni3S2@Mo2S3呈纳米板形貌，由六方Ni3S2和单斜Mo2S3按5∶1的比例复合而成；在1 mol·L-1 KOH 溶液中，Ni3S2@Mo2S3催化剂仅需要170 mV过电位就可达到10 mA·cm-2电流密度（欧姆补偿后），且在50 h的稳定性测试期间性能基本无衰减，优于贵金属催化剂IrO2以及文献报道的Ni-Mo基复合催化剂。Ni3S2@Mo2S3具有优异电催化性能的原因可归于不同过渡金属化合物的协同作用、原位生长自支撑、电化学活性面积大以及液下疏气性等因素。

关键词: 水热, 电化学, 催化, 析氧反应

Abstract:

The Ni3S2@Mo2S3 self-supported catalyst for oxygen evolution reaction in water electrolysis was in situ synthesized on MoNi foam (MNF) by one-step hydrothermal method with MNF as the sources of Ni and Mo. The morphology, composition and OER electrocatalytic performance of the as-prepared catalyst were characterized by the corresponding characterization techniques and electrochemical methods. The catalyst was consisted of irregular nano-slabs with the composition of hexagonal Ni3S2 and monoclinic Mo2S3 in a ratio of 5∶1. The as-prepared Ni3S2@Mo2S3 only needed an overpotential of 170 mV (after IR compensation) to drive a current density of 10 mA·cm-2 in 1 mol·L-1 KOH with negligible degradation during the 50 h stability test, which was superior to the commercial catalyst IrO2 and other Ni-Mo based catalysts reported. The excellent electrocatalytic performance of Ni3S2@Mo2S3 can be attributed to the synergistic effect of different transition metal compounds, self-supporting in situ growth, large electrochemically active area, and aerophobicity under liquid.

Key words: hydrothermal, electrochemistry, catalysis, oxygen evolution reaction

中图分类号: 

  • TQ 151.1

图1

水热样品在不同放大倍数下的FE-SEM图像"

图2

水热产物的XRD与XPS表征结果"

图3

电催化性能测试结果"

表1

Ni-Mo基复合催化剂催化性能比较"

催化剂η10/mVStability/h文献
Ni3S2@Mo2S3/NMF17050this work
MoS2/NiS/NF21610000 cycles[48]
MoS2/NiS227824[49]
MoS2/Ni3S221810[50]
Ni3S2@MoS2/FeOOH23450[51]
MoS2-Ni3S2 HNRs/NF24948[52]
light Fe-doped (NiS2/MoS2)/CNT234—[53]
NiMoS26015[54]
MoS2/NiS yolk-shell35024[55]

图4

CV曲线和Cdl拟合结果"

图5

气体接触角测试结果"

图6

理论模型（蓝色代表Ni原子；绿色代表Mo原子；黄色代表S原子）"

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