文章编号：1004－5422(2022)01－071－06

DOI:10.3969/j.issn.1004-5422.2022.01.012

铁基双氢氧化物的制备与析氧性能研究

韩杨兵¹,邓建平¹，李　雪¹，王晶斌¹，邵　庄²，李　涛¹

（1.成都大学 机械工程学院，四川 成都 610106；2.大工（青岛）新能源材料技术研究院有限公司，山东 青岛　266200）

摘　要：析氧反应是水分解反应中的一个重要反应，而开发具有低成本高效率的催化剂对于非贵金属催化剂的实际应用至关重要.采用水热法制备了生长在泡沫镍上的三维花瓣状NiFe-LDH/NF、CoFe-LDH/NF纳米片，其层状多孔的泡沫镍为层状双氢氧化物提供了较大的电化学活性表面积和丰富的电化学反应活性位点,而Ni ²⁺与Fe³⁺之间的协同作用优化了制备的催化剂的电子结构,进一步提高了其析氧反应活性.实验结果表明,在碱性溶液中,NiFe-LDH/N-F和CoFe-LDH/NF比其相应的单金属化合物具有更强的电化学活性;在电流密度为20 mA/cm²时,NiFeLDH/NF的过电位仅为180 mV,其Tafel斜率为47.4 mV/dec,优于大多数非贵金属催化剂；NiFe-LDH/NF在电化学耐久性测试中表现出了优异的稳定性和耐久性，在0.8 V的阶跃电位下持续电解10 h,其电流密度无明显衰减,为62 mA/cm².

关键词：析氧反应；层状双氢氧化物；水热反应

中图分类号：TB383;0646         文献标识码：A

Preparation and Oxygen Evolution Properties  of Iron Based Double Hydroxides

HAN Yangbing¹，DENG Jianping²，LI Xue¹，WANG Jingbin¹， SHAO Zhuang¹,LI Tao¹

(1.School of Mechanical Engineering,Chengdu University,Chengdu 610106,China;

2.New Energy Material  Technology Institute Ltd.of Dagong(Qiangdao),Qingdao 266200,China)

Abstract：Oxygen evolution reaction (OER) is an important reaction in water decomposition reaction.The development of OER catalysts with low cost and high efficiency is very important for the practical application of nonnoble metal catalysts.Three-dimensional petal like NiFe-LDH/NF and CoFe-LDH/NF nanosheets grown on nickel foam (NF) were prepared by one-step hydrothermal method.Layered porous nickel provides a larger Electrochemical Active Surface Area (ECSA) for layered double hydroxides,and provides a more abundant reactive site for OER reaction.The synergistic effect between Ni^{2 +} and Fe^{3 +} effectively improved the activity of OER.Based on the advantages mentioned above,in alkaline solution,NiFe-LDH/NF nanosheets and CoFe-LDH/NF exhibit better OER activity and durability than their corresponding single metal compounds.When the current density is 20 mA/cm²,the over potential of NiFe-LDH/NF η is only 180 mV and its Tafel slope is 47.4 mV/dec,which is better than that of most non valuable catalysts.NiFe-LDH/NF shows high stability and durability in electrochemical durability test.The current density can still be maintained at 62 mA/cm² after continuous electrolysis for 10 hours at a step potential of 0.8 V.

Key words：oxygen evolution reaction;layered double hydroxide;hydrothermal reaction