摘要
我们合理设计和制备了一种新型的高性能析氧电催化剂——泡沫镍负载Co3O4@NiMn-LDH(层状双金属氢氧化物)三维异质结构阵列(Co3O4@NiMn-LDH/NF)。这种基于泡沫镍基底的三维异质结构催化剂经简单的两步水热反应即可制得。对比Co3O4、NiMn-LDH及传统RuO2催化剂,所制备的Co3O4@NiMn-LDH/NF催化剂展示出更优异的电催化析氧性能。在1 mol·L^-1 KOH溶液中,电流密度为50 mA·cm^-2时的过电势仅为282 mV,塔菲尔斜率为64 mV·dec^-1。通过有效的界面工程设计,使异质结构陈列Co3O4@NiMn-LDH发挥出Co3O4和NiMn-LDH各自优异的电催化性能。其中,基于泡沫镍基底生长的活性组分Co3O4纳米线阵列作为中间核支撑结构,保持了良好的空隙率,不仅有利于暴露更多的活性位点,而且有利于电解液的扩散和气体产物的释放;而依附于Co3O4纳米线阵列上的NiMn-LDH异质结构纳米片层则富有更多的亲水性基团,使得活性位点更易与水结合,从而促进氧析出反应的进行。
In this paper,we report the rational design and preparation of a new type of high-performance oxygen evolution electrocatalyst,namely 3D heterostructured Co3O4@NiMn-LDH(layered double metal hydroxide)arrays supported on Ni foam(Co3O4@NiMn-LDH/NF).It was prepared via facile two-step hydrothermal reactions.Compared with Co3O4,NiMn-LDH and traditional RuO2 electrocatalysts,the as-prepared Co3O4@NiMn-LDH/NF presents better electrocatalytic oxygen evolution performance,achieving a low overpotential of 282 mV at 50 mA·cm^-2 with a Tafel slope of 64 mV·dec^-1 in 1 mol·L^-1 KOH solution.Through designing effective interface engineering,the Co3O4@NiMn-LDH/NF combines synergistically the excellent electrocatalytic activity of Co3O4 and NiMn-LDH.The Co3O4 nanowire array based on Ni foam as a core structure with abundant void spaces not only exposes more active sites,but also ensures easy diffusion of electrolyte and fast release of gas products.And the NiMn-LDH nanosheets on the Co3O4 nanowire array provide rich hydrophilic groups and active sites for easy access of water molecules,thus facilitating efficient oxygen evolution reaction.
作者
孙志裕
曹帅
黄小琴
范小明
杨则恒
张卫新
SUN Zhi-Yu;CAO Shuai;HUANG Xiao-Qin;FAN Xiao-Ming;YANG Ze-Heng;ZHANG Wei-Xin(School of Chemistry and Chemical Engineering,Hefei University of Technology,Anhui Provincial Key Laboratory of Advanced Catalytic Materials and Reaction Engineering,Hefei 230009,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2020年第10期1899-1905,共7页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.91834301,91534102,21808046)
安徽省科技重大专项(No.201903a05020021)资助项目。
