Pyridine-modulated Ni/Co bimetallic metal-organic framework nanoplates for electrocatalytic oxygen evolution  

吡啶调节2D双金属有机框架及其电催化析氧性能研究

作　　者：Yang Bai Guangxun Zhang Shasha Zheng Qing Li Huan Pang Qiang Xu 柏杨;张光勋;郑莎莎;李清;庞欢;徐强(School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou,225009,China;Guangling College,Yangzhou University,Yangzhou,225009,China;AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory(ChEM-OIL),National Institute of Advanced Industrial Science and Technology(AIST),Kyoto,606-8501,Japan)

机构地区：[1]School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou,225009,China [2]Guangling College,Yangzhou University,Yangzhou,225009,China [3]AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory(ChEM-OIL),National Institute of Advanced Industrial Science and Technology(AIST),Kyoto,606-8501,Japan

出　　处：《Science China Materials》2021年第1期137-148,共12页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(U1904215,21671170 and 21875207);the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions(TAPP);the Program for New Century Excellent Talents of the University in China(NCET-13-0645);the Six Talent Plan(2015XCL-030);Qinglan Project;the Priority Academic Program Development of Jiangsu Higher Education Institutions;the support from the postdoctoral fund of Yangzhou University。

摘　　要：Two-dimensional(2D)metal-organic frameworks(MOFs)are promising for electrocatalysis with high performance,as they possess large surface areas and high densities of exposed active sites.It attracts tremendous attention to obtain 2D nanostructures via simple preparation methods.Herein,a facile pyridine-modulated solvothermal synthesis of Ni/Co bimetallic MOF nanoplates(NixCoy-bpy(PyM))is reported with well-defined 2D morphology with a thickness as thin as 20 nm and an aspect ratio larger than 50.These nanoplates possess oxygen evolution reaction activity as electrocatalysts in alkaline conditions.Specifically,Ni0.5Co1.5-bpy(PyM)exhibits excellent OER electrocatalytic activity with a low overpotential of 256 mV at 10 m A cm-2 and a small Tafel slope of 81.8 mV dec-1 in 1.0 mol L-1 KOH with long-term electrochemical stability for 3000 cyclic voltammetry cycles.The high catalytic activity of Ni0.5Co1.5-bpy(PyM)can be attributed to the in situ formed active hydroxide and oxyhydroxide species within the inherited 2D morphology and the optimized bimetallic ratio.二维金属有机骨架(2D MOF)具有较大的比表面积和较高的活性位点密度,是改善电催化性能的理想载体.通过简单的制备方法获得2D纳米结构受到了广泛的关注.本文提出了一种吡啶调节溶剂热合成方法,用于合成镍/钴双金属MOF纳米片.得到的MOF材料具有矩形2D形貌,厚度约20纳米.这些纳米片作为电催化剂在碱性条件下表现出析氧反应(OER)活性.其中,Ni0.5Co1.5-bpy(PyM)在1.0 mol L-1KOH溶液中、电流密度10 mA cm-2时过电位低至256 mV,Tafel斜率为81.8 mV dec-1,且具有良好的电化学稳定性.对催化反应后的电极材料研究表明,Ni0.5Co1.5-bpy(PyM)的高催化活性来源于原位形成的活性氢氧化物和羟基氧化物.该研究为2D MOF材料的可控合成及其与电催化性能构效关系的研究提供了理论基础.

关 键 词：metal-organic framework bimetallic MOF nanoplate ELECTROCATALYSIS oxygen evolution reaction 

分 类 号：O643.36[理学—物理化学] TB383.1[理学—化学]