高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (6): 20220768.doi: 10.7503/cjcu20220768

• 物理化学 • 上一篇    下一篇

(Ag, Au)/MoS2的电解水性能及等离激元光热作用

桑丽霞(), 马梦楠   

  1. 北京工业大学传热强化与过程节能教育部重点实验室, 传热与能源利用北京市重点实验室, 北京 100124
  • 收稿日期:2022-12-19 出版日期:2023-06-10 发布日期:2023-02-28
  • 通讯作者: 桑丽霞 E-mail:sanglixia@bjut.edu.cn
  • 基金资助:
    国家自然科学基金(52176174)

(Ag, Au)/MoS2 as Electrocatalyst for Water Splitting and Its Thermoplamonics Effect

SANG Lixia(), MA Mengnan   

  1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Ministry of Education,Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology,Beijing 100124,China
  • Received:2022-12-19 Online:2023-06-10 Published:2023-02-28
  • Contact: SANG Lixia E-mail:sanglixia@bjut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52176174)

摘要:

MoS2是电解水体系的一种备受关注的非贵金属析氢催化剂, 优化其活性位点是提高其活性的研究重点. 采用水热法在三维导电碳布(CC)上合成了二维片状MoS2, 将反应温度从200 ℃调至180 ℃可保留具有更多活性位点的1T相, 相应的MoS2(180)/CC电极表现出相对更低的析氢过电位. 利用电化学方法在MoS2(180)/CC上分别沉积Ag和Au纳米粒子, 得到Ag/MoS2(180)/CC和Au/MoS2(180)/CC电极. 扫描电子显微镜(SEM)、 X射线衍射(XRD)、 X射线光电子能谱(XPS)表征结果以及无光照、 光照和加热条件下电化学极化曲线、 电化学阻抗谱(EIS)和Tafel斜率的测试结果表明, 20 nm Ag和30 nm Au的负载及光照条件均可降低析氢过电位和增加电流密度, 而体系温升的作用与金属的种类有关. 利用COMSOL Multiphysics软件构建MoS2, Ag/MoS2和Au/MoS2模型, 模拟计算了光照下的电场和温度场, 证实了Ag和Au纳米粒子的热等离激元效应及其加速电极反应从而提高电解水析氢性能的作用.

关键词: 电解水, 二硫化钼纳米片, 析氢过电位, 等离激元金属, 热等离激元效应

Abstract:

MoS2 has expected to become a promising non-precious metal catalyst for hydrogen evolution from water electrolysis, and its performances need to be improved by optimizing its active sites. In this paper, two-dimensional flake MoS2 was synthesized on three-dimensional conductive carbon cloth(CC) by hydrothermal method. When adjusting the reaction temperature from 200 ℃ to 180 ℃, 1T phase with more active sites of MoS2 can be reserved, and the corresponding MoS2(180)/CC electrode exhibits a relatively lower hydrogen evolution overpotential. Ag/MoS2(180)/CC and Au/MoS2(180)/CC were prepared by deposing Ag and Au nanoparticles on MoS2(180)/CC via electrochemical process, respectively. Based on characterization of scanning electron microscopy(SEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and measurements of polarization curves, electrochemical impedance spectroscopy(EIS) and Tafel slope of the resultant electrodes with and without illustration as well as heating, it can be found that the overpotentials and current densities of Ag/MoS2(180)/CC and Au/MoS2(180)/CC can be improved due to the deposition of 20 nm Ag and 30 nm Au or the condition of irradiation, and the role of temperature rise is related to the type of metal. Furthermore, MoS2, Ag/MoS2 and Au/MoS2 models were constructed by using the COMSOL Multiphysics software, and the electric field and temperature field under illumination were simulated and calculated, confirming thermoplamonics effect of Ag and Au nanoparticles and its role in accelerating the kinetics of the electrode reaction and improving the hydrogen evolution performance of electrolyzed water.

Key words: Electrolysis of water, MoS2 nanosheets, Hydrogen evolution overpotential, Plasmonic metal, Thermoplamonics effect

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