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电化学(中英文) ›› 2020, Vol. 26 ›› Issue (1): 136-147.  doi: 10.13208/j.electrochem.190114

• 研究论文 • 上一篇    下一篇

Ni-Fe/Ti和Ni-Fe-S/Ti的制备及其电催化水分解性能

陆杭烁1, 何小波2,3, 银凤翔1,2,3,*(), 李国儒2   

  1. 1. 北京化工大学化学工程学院,北京 100029
    2. 常州大学石油化工学院,江苏省绿色催化材料与技术重点实验室,江苏 常州 213164
    3. 北京化工大学常州先进材料研究院,江苏 常州 213164
  • 收稿日期:2019-01-14 修回日期:2019-04-01 出版日期:2020-02-28 发布日期:2019-03-29
  • 通讯作者: 银凤翔 E-mail:yinfx@cczu.edu.cn
  • 基金资助:
    国家自然科学基金项目(21706010);江苏省自然科学基金面上项目(BK20161200)

Preparations of Nickel-Iron Hydroxide/Sulfide and Their Electrocatalytic Performances for Overall Water Splitting

Hang-shuo LU1, Xiao-bo HE2,3, Feng-xiang YIN1,2,3,*(), Guo-ru LI2   

  1. 1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
    2. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
    3. Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Changzhou 213164, Jiangsu, China
  • Received:2019-01-14 Revised:2019-04-01 Published:2020-02-28 Online:2019-03-29
  • Contact: Feng-xiang YIN E-mail:yinfx@cczu.edu.cn

摘要:

以钛网为基底,采用电沉积法制备了Ni-Fe/Ti析氧电极,然后将得到的Ni-Fe/Ti电极通过固相硫化制备了Ni-Fe-S/Ti析氢电极. 分别考察了电沉积液中Ni2+/Fe3+离子摩尔浓度比和硫脲加入量对Ni-Fe/Ti和Ni-Fe-S/Ti结构和电化学性能的影响. 结果表明,随着电沉积液中Ni2+含量的增加,Ni-Fe/Ti电极析氧性能先增强后减弱,Ni9Fe1/Ti电极具有最好的析氧性能;随着硫脲加入量的增加,Ni-Fe-S/Ti电极析氢性能呈现先增强后减弱的趋势,Ni9Fe1S0.25/Ti电极具有最好的析氢性能. 在50 mA·cm-2下,Ni9Fe1/Ti电极的析氧过电位为280 mV,Ni9Fe1S0.25/Ti电极的析氢过电位为269 mV,且均具有很好的稳定性. 将Ni9Fe1/Ti与Ni9Fe1S0.25/Ti分别作为阳极和阴极进行电催化全水分解,电流密度达到50 mA·cm-2所需电势仅1.69 V,表现出很好的全水解催化性能.

关键词: 镍铁氢氧化物, 镍铁硫化物, 氧气析出反应, 氢气析出反应, 电催化全水分解

Abstract:

The Ni-Fe/Ti oxygen evolution electrode was prepared by electrodeposition on a titanium mesh substrate. Then, the as prepared Ni-Fe/Ti electrode was used to derive the Ni-Fe-S/Ti hydrogen evolution electrode through solid phase sulfuration. The effects of the molar ratio of Ni2+ to Fe3+ in the electrolyte and the amount of thiourea on the structures and electrochemical performances of Ni-Fe/Ti and Ni-Fe-S/Ti electrodes were investigated. The results show that the oxygen evolution performance of Ni-Fe/Ti electrode was first increased and then decreased with the increase of nickel ion content in the electrolyte. The Ni9Fe1/Ti electrode exhibited the best oxygen evolution performance. With the increase of thiourea addition, the hydrogen evolution performance of Ni-Fe-S/Ti electrode was increased firstly and then decreased. The Ni9Fe1S0.25/Ti electrode showed the best hydrogen evolution performance. To achieve a current density of 50 mA·cm-2, an overpotential of 280 mV was required for oxygen evolution reaction (OER) with the Ni9Fe1/Ti electrode, while 269 mV for hydrogen evolution reaction (HER) with the Ni9Fe1S0.25/Ti electrode, both with good stabilities. Accordingly, the Ni9Fe1/Ti and Ni9Fe1S0.25/Ti electrode were used as anodes and cathodes, respectively, for overall water splitting tests. The current density of 50 mA·cm-2 was achieved at a voltage of 1.69 V, showing the good catalytic performance of overall water splitting.

Key words: nickel-iron hydroxide, nickel-iron sulfide, oxygen evolution reaction, hydrogen evolution reaction, overall water splitting

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