摘要
高效节能的析氢反应需要高效、耐用、低成本的催化剂来加快质子还原并获得最小的过电位和快速的反应动力.本文报道了一种由CoMoO4和Me IM在甲醇/水/三乙胺混合溶液中合成的钼酸根离子配位沸石咪唑酯框架结构多孔纳米棒(ZIF-67/MoO_(4)^(2-)),并利用热解法成功制备了高效析氢的催化剂:均匀镶嵌Co/β-Mo_(2)C纳米颗粒的中空结构掺氮碳纳米棒(N-C/Co/Mo_(2)C).ZIF-67/MoO_(4)^(2-)中分布均一的MoO42-使得Co/β-Mo_(2)C纳米颗粒能够很好地分散在中空结构掺氮碳纳米棒中.这种合成策略赋予了N-C/Co/Mo_(2)C催化剂上均匀镶嵌着双金属纳米颗粒,从而具有优异的电催化析氢活性(在1.0 mol L^(-1)氢氧化钾水溶液,10 mA cm^(-2)电流密度下其过电位低达142.0 mV)和较长的循环寿命.
The hydrogen evolution reaction(HER)as a fundamental process in electrocatalysis plays a significant role in clean energy technologies.For an energy-efficient HER,it demands an effective,durable,and low-cost catalyst to trigger proton reduction with minimal overpotential and fast kinetics.Here,we successfully fabricate a highly efficient HER catalyst of N-C/Co/Mo_(2)C holey nanorods with Co/b-Mo_(2)C nanoparticles uniformly embedded in nitrogen-doped carbon(N-C/Co/Mo_(2)C)by pyrolyzing the molybdate-coordinated zeolitic imidazolate framework(ZIF-67/MoO_(4)^(2-))holey nanorods,which result from the reaction between CoMoO_(4)and Me IM in a methanol/water/triethylamine mixed solution.The uniform distribution of MoO_(4)^(2-)in the ZIF-67/MoO_(4)^(2-)enables Co/β-Mo_(2)C nanoparticles to be welldistributed within nitrogen-doped carbon holey nanorods.This synthetic strategy endows the N-C/Co/Mo_(2)C catalyst with uniformly decorated bimetal,thus attaining excellent HER electrocatalytic activities with a small overpotential of 142.0 m V at 10 m A cm^(-2)and superior stability in 1.0 mol L^(-1)KOH aqueous solution.
作者
陈立锋
侯春朝
邹联力
Mitsunori Kitta
徐强
Li-Feng Chen;Chun-Chao Hou;Lianli Zou;Mitsunori Kitta;Qiang Xu(Research Institute of Electrochemical Energy,National Institute of Advanced Industrial Science and Technology(AIST),Ikeda,Osaka 563-8577,Japan;AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory(ChEM-OIL),AIST,Yoshida,Sakyo-ku,Kyoto 606-8501,Japan;School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225009,China)
基金
National Institute of Advanced Industrial Science and Technology(AIST)
the Japan Society for the Promotion of Science(JSPS)for financial support。
