自支撑NiFe LDHs@Co-OH-CO_(3)纳米棒阵列电极用于碱性阴离子交换膜电解水  

Self-Supporting NiFe LDHs@Co-OH-CO_(3)Nanorod Array Electrode for Alkaline Anion Exchange Membrane Water Electrolyzer

作　　者：郭丹丹 俞红梅[1] 迟军[1] 邵志刚[1] Dan-Dan Guo;Hong-Mei Yu;Jun Chi;Zhi-Gang Shao(Fuel Cell System and Engineering Laboratory,Key Laboratory of Fuel Cells&Hybrid Power Sources,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《电化学》2022年第9期77-93,共17页Journal of Electrochemistry

基　　金：supported by the Key Program of the National Natural Science Foundation of China(No.22090032,22090030);the Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy(Grant.YLU-DNL Fund 2021001);support from the Dalian Key Laboratory of Electrolysis for Hydrogen Production。

摘　　要：开发高效耐用的电极对碱性阴离子交换膜电解水(AEMWEs)制氢至关重要。在这项研究中,我们展示了一种高效且稳定的自支撑NiFe LDHs@Co-OH-CO_(3)/NF纳米棒阵列电极分别用于析氧反应(OER)和AEMWE的阳极。在这项工作中,我们将2D的镍铁层状双金属氢氧化物纳米片(NiFe LDHs)原位生长在1D的碱式碳酸钴纳米线上(Co-OH-CO_(3)/NF),最终得到独特的纳米棒阵列复合结构电极。在三电极体系中,自支撑NiFe LDHs@Co-OH-CO_(3)/NF对OER具有良好的催化活性,在1 mol·L^(-1)KOH中,当电流密度为20 m A·cm^(-2)时,过电位为215 mV。当自支撑NiFe LDHs@Co-OH-CO_(3)/NF作为AEMWE的阳极(70℃,1 mol·L^(-1)KOH),在电流密度为0.5 A·cm^(-2)时,电解电压为1.72 V,并且具有较好的稳定性。进一步的实验表征结果显示了自支撑NiFe LDHs@Co-OH-CO_(3)/NF的优异性能是其具有特殊的形貌结构。这是由于纳米棒阵列电极的三维分层结构可以有效防止纳米片团聚,从而有利于电子转移,为水分解提供大量的边缘活性位点。The development of efficient and durable electrodes for anion exchange membrane water electrolyzers(AEMWEs)is essential for hydrogen production.In this work,2D NiFe layered double hydroxides(NiFe LDHs)nanosheets were grown on the 1D cobaltous carbonate hydroxide nanowires array(Co-OH-CO_(3))and the unique 3D layered self-supporting nanorod array(NiFe LDHs@Co-OH-CO_(3)/NF)electrode was obtained.Importantly,we demonstrated an efficient and durable self-supporting NiFe LDHs@Co-OH-CO_(3)/NF electrode for oxygen evolution reaction(OER)and as the anode of the AEMWE.In a three-electrode system,the self-supporting NiFe LDHs@Co-OH-CO_(3)/NF electrode showed excellent catalytic activity for OER,with an overpotential of 215 mV at a current density of 20 mA·cm^(-2)in 1 mol·L^(-1)KOH,and the promising AEMWE performance upon using as the anode,with a current density of 0.5 A·cm^(-2)at 1.72 V in 1 mol·L^(-1)KOH at 70℃.The experimental results further revealed the outstanding performance of the electrode with the special morphological structure.The 3D layered structure of nanorod array electrode could effectively prevent the agglomeration of nanosheets,which is conducive to electron transfer and provides a large number of edge active sites for water electrolyzer.

关 键 词：镍铁层状双金属氢氧化物 析氧反应 碱性阴离子交换膜电解 

分 类 号：TQ116.21[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程]