摘要
电化学水裂解制氢是生产清洁能源的方式之一,然而析氧反应(OER)这一重要的半反应涉及复杂四电子转移而显著降低了整体水裂解的效率。利用界面工程,采用电沉积的方法使Ni(OH)_(2)/CeO_(2)杂化物颗粒修饰原位生长在泡沫镍(NF)上的Ni_(3)S_(2)纳米片阵列从而成功制备一种高效且稳定的OER复合电极。利用扫描电镜(SEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等测试手段对电极材料的微观结构、物相组成和表面元素价态进行表征和分析。在1.0 M KOH电解液当中,驱动100 mA/cm^(2)电流密度所需过电势仅为330 mV,其Tafel斜率为150.7 mV/dec,且至少能保持25 h的耐久性。优越的电催化性能是由于Ni(OH)_(2)/CeO_(2)颗粒与Ni_(3)S_(2)纳米阵列产生的协同催化效应以及Ce^(4+)阳离子对OER活性组分的生成起到促进作用。研究证实稀土化合物在修饰硫化物催化剂方面具有一定的潜力,可广泛应用于能源催化领域。
Electrochemical water splitting is one of the ways to produce clean energy.However,oxygen evolution reaction(OER),an important half-reaction involving complex four-electron transfer,significantly reduces the overall water splitting efficiesncy.In this paper,by means of interface engineering,Ni(OH)_(2)/CeO_(2) hybrid particles were modified with Ni_(3)S_(2) nanosheet arrays grown in situ on nickel foam(NF)by electrodeposition,so as to successfully prepare an efficient and stable OER composite electrode.Scanning electron microscopy(SEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)were used to characterize and analyze the microstructure,phase composition and surface element valence of the electrode materials.In the 1.0 M KOH electrolyte,the overpotential required to drive the current density of 100 mA/cm^(2) is only 330 mV,the Tafel slope is 150.7 mV/dec,and the durability can be maintained for at least 25 h.The excellent electrocatalytic performance is due to the synergistic catalytic effect of Ni(OH)_(2)/CeO_(2) particles and Ni_(3)S_(2) nanoarray and the promotion of Ce^(4+) cations on the formation of OER active components.This study confirms that rare earth compounds have certain potential in modifying sulfide catalysts and can be widely used in the field of energy catalysis.
作者
杨玛萌
李妍
刘江英
许文轩
郭凤英
张军军
包维维
YANG Mameng;LI Yan;LIU Jiangying;XU Wenxuan;GUO Fengying;ZHANG Junjun;BAO Weiwei(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723000,China;Tongliao Market Inspection and Testing Center,Tongliao 028000,China;College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China)
出处
《功能材料》
CAS
CSCD
北大核心
2023年第8期8140-8147,8156,共9页
Journal of Functional Materials
基金
国家自然科学基金项目(21902123)
陕西理工大学开放课题研究基金(SLGPT2019KF01-03)。
关键词
电催化剂
析氧反应
电沉积
过渡金属硫化物
纳米复合物
electrocatalyst
oxygen evolution reaction
electrodeposition
transition metal sulfide
nanocomplex
