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 m V,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.
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 m A·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.
作者
陆杭烁
何小波
银凤翔
李国儒
LU Hang-shuo;HE Xiao-bo;YIN Feng-xiang;LI Guo-ru(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology,School of Petrochemical Engineering,Changzhou University,Changzhou 213164,Jiangsu,China;Changzhou Institute of Advanced Materials,Beijing University of Chemical Technology,Changzhou 213164,Jiangsu,China)
出处
《电化学》
CAS
CSCD
北大核心
2020年第1期136-147,共12页
Journal of Electrochemistry
基金
国家自然科学基金项目(No.21706010)
江苏省自然科学基金面上项目(No.BK20161200)资助。
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
nickel-iron hydroxide
nickel-iron sulfide
oxygen evolution reaction
hydrogen evolution reaction
overall water splitting
