电沉积CoLa-LDH@NF用于高效碱性析氧反应  

Synthesis CoLa-LDH@NF by electrodeposition method for high efficiency alkaline oxygen evolution reaction

作　　者：卫学玲[1] 蒋鹏[1] 包维维[1] 邹祥宇[1] 寇领江 艾桃桃[1] WEI Xueling;JIANG Peng;BAO Weiwei;ZOU Xiangyu;KOU Lingjiang;AI Taotao(School of Materials Science and Engineering,Hanzhong 723000, China)

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723000

出　　处：《功能材料》2022年第5期5123-5129,共7页Journal of Functional Materials

基　　金：国家自然科学基金青年项目(51504147);陕西省科技厅青年项目(2021JQ-762);陕西省教育厅一般专项(21JK0558)。

摘　　要：开发高效稳定的析氧电催化剂是可持续发展氢能源的关键。简单快速制备层状双金属氢氧化物催化剂对电解水制氢的工业化具有重要意义。以六水合硝酸钴、六水硝酸镧为原料,利用三电极体系电化学工作站,在镍网上快速(90 s)电沉积制备出CoLa-LDH@NF,采用XRD、XPS、SEM和各种电化学方式表征其结构和性能。结果表明,纳米片状CoLa-LDH@NF在1 mol/L KOH溶液中具有优异的析氧催化性能。超薄片状结构增加CoLa-LDH@NF与电解液的接触面积,增大了参与反应的有效活性位点数。驱动10 mA/cm^(2)的电流密度需要过电位为251 mV,塔菲尔斜率为47 mV/dec,具有良好的析氧稳定性和耐久性。Developing high efficiency and stability electrocatalysts for oxygen evolution reaction(OER)is the key to the sustainable development of hydrogen energy.Simple and fast synthesis of layered double hydroxide(LDH)catalysts is of great significance for the industrialization of hydrogen production by water splitting.CoLa-LDH@NF electrodes were synthesized from cobalt nitrate hexahydrate and lanthanum nitrate hexahydrate by rapid(90 s)electrodeposition on nickel foam by using a three-electrode system.XRD,XPS,SEM and various electrochemical methods were used to study the structure and performance.The results showed that CoLa-LDH@NF nanosheets exhibited excellent oxygen evolution reaction catalytic performance in 1 mol/L KOH solution.The ultra-thin sheet structure increased the contact area between CoLa-LDH@NF and electrolyte,and the number of active sites.At a current density of 10 mA/cm^(2),the overpotential of CoLa-LDH@NF was 251 mV.The corresponding Tafel slope value was 47 mV/dec.CoLa-LDH@NF shows good electrochemical stability and durability.

关 键 词：催化性能 电沉积 层状双金属氢氧化物 析氧反应 CoLa-LDH@NF 

分 类 号：O646[理学—物理化学]