Li Yong,Zhu Sida,Zhao Kun,et al.Study on the HER and OER catalytic properties of NiPOH-RuO2 for alkaline water electrolysis[J].Plating & Finishing,2024,(12):10-18.
碱水电解用NiPOH-RuO2催化电极的析氢析氧反应研究
- Title:
- Study on the HER and OER catalytic properties of NiPOH-RuO2 for alkaline water electrolysis
- Keywords:
- RuO2; Ni11(HPO3)8(OH)6; first-principles calculations; electrolyzingwater; hydrogenevolution reaction; oxygen evolution reaction
- 分类号:
- TG172.3
- 文献标志码:
- A
- 摘要:
- 电解水制氢用电极材料对析氢和析氧反应起着重要的作用。羟基亚磷酸镍(Ni11(HPO3)8(OH)6，缩写为NiPOH）具有多孔结构和丰富的活性中心备受关注，然而其低电导率以及相应的缓慢电子转移速率限制了其电催化性能。添加高导电性和活性物质提升电子传输效率和反应动力学，有望增强其在电解水过程中的催化活性与持久性。本文采用水热法在泡沫镍上原位生长NiPOH-x at.% RuO2电极材料，采用X射线衍射仪（XRD）、X射线光电子能谱仪（XPS）、扫描电子显微镜（SEM）、线性扫描伏安法（LSV）和计时电位法（CP）等研究RuO2含量对电极微观形貌及其电化学性能的影响，辅以第一性原理计算探讨NiPOH-x at.% RuO2在全解水过程中的性能。结果表明：添加RuO2可改变NiPOH微球的形貌，使其具有更大比表面积。Ni元素是由Ni2+和Ni3+组成，Ru由Ru3+和Ru4+组成。Ru掺杂使NiPOH的电子转移能垒降低，费米能级附近电子密度增大。当电流密度为10 mA/cm2时，RuO2的加入明显降低了析氢过电位，NiPOH-3 at.% RuO2的析氢过电位最低为93 mV，而NiPOH电极为161 mV，NiPOH-3 at.% RuO2电极的析氧Tafel斜率同期达到最小。NiPOH-x at.% RuO2电极的析氢过程是以Heyrovsky步骤为主的Volmer-Heyrovsky控制反应。
- Abstract:
- Electrode materials for water electrolysis play an important role in hydrogen evolution and oxygen evolution. Nickel hydroxyphosphite(Ni11(HPO3)8(OH)6, abbreviated as NiPOH) has more porous structures and abundant active sites, however, its low conductivity with a corresponding slow electron transfer rate limits its electrocatalyticproperties.The addition of highly conductive and active substances can improve the electron transmission efficiency and reaction kinetics, which is expected to enhance its catalytic activity and stability during the process of water electrolysis. In this paper, the NiPOH-x at.% RuO2 electrodes was grown in situ on the nickel foam by a hydrothermal method. X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscope(SEM), linear sweep voltammetry(LSV) and Chronopotentiometry(CP)wereused to study the influence of RuO2 content on the micromorphology and electrochemical properties of the prepared electrodes. The performance ofNiPOH-x at.% RuO2 during the whole process of electrolyzing water was explored by the First-principles calculations. It’s shown that the RuO 2could change the morphology, and make the microspheres have a larger specific surface area. The Ni element was composed of Ni2+ and Ni 3+, and Ru consisted of Ru3+ and Ru 4+.The energy barriers for electron transfer were decreased after doping RuO2 to NiPOH, and the electron density near the Fermi level increased.When the current density was 10 mA/cm 2, the hydrogen overpotential was significantly reduced with the addition of RuO2 and the hydrogen overpotential of NiPOH-3 at.% RuO2 could reach the minimum of 93 mV, while the hydrogen overpotential of the NiPOH electrode was 161 mV. The Tafel slope of the oxygen evolution of NiPOH-3 at.% RuO 2 electrode could be the minimum at the same time. The hydrogen evolution process of the NiPOH- x at.% RuO2 electrode was a Volmer-Heyrovsky controlled reaction dominated by the Heyrovsky step.
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