纳米粒子改性的双金属纳米片阵列的析氧性能  

Oxygen Evolution Performance of Nano-modified Bimetallic Oxide Nanosheets Array

作　　者：刘建平 宇文超 刘秉国[2,3] 郭胜惠[2,3] 荣茜 LIU Jianping;YUWEN Chao;LIU Bingguo;GUO Shenghui;RONG Qian(Yunnan Yuntong Zinc Co.,Ltd.,Kunming 650000,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Key Laboratory of Unconventional Metallurgy,Kunming University of Science and Technology,Kunming 650093,China;Qujing Normal University,Qujing 655000,China)

机构地区：[1]云南云铜锌业股份有限公司,昆明650000 [2]昆明理工大学冶金与能源工程学院,昆明650093 [3]昆明理工大学非常规冶金省部共建教育部重点实验室,昆明650093 [4]曲靖师范学院,云南曲靖655000

出　　处：《有色金属工程》2023年第1期1-9,共9页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(51961020);国家重点研发计划项目(2018YFC1900500)。

摘　　要：过渡金属氧化物和氢氧化物因具有较低的成本和良好的活性等优势已逐渐成为新一代析氧反应(OER)的催化剂,然而,其较高Tafel斜率阻碍了它们取代常规Ir和Ru基催化剂。通过低温自沉积法在导电ITO基底上合成了NiO纳米片阵列,之后基于不同的钴盐在非极性溶剂(例如丙酮)中的活性不同而对NiO纳米片阵列进行修饰,成功构建了不同结构的混合过渡金属纳米片阵列,其中氯盐的引入会在NiO纳米片上产生刻蚀的效果而生成多孔的CoNi-O纳米片,而硝酸盐的引入会在NiO纳米片表面二次生长而生成分枝CoNi-O纳米片。Co盐的引入不仅赋予了材料独特的纳米结构,也提高了NiO纳米片阵列的析氧能力。相比于纯的NiO纳米片(56.9 mV/dec),修饰后所获得的多孔CoNi-O纳米片(33.7 mV/dec)和分枝CoNi-O纳米片(29.1 mV/dec)在0.1 mol/L的KOH电解液中具有较小的Tafel斜率。因此,通过表面修饰来构建不同形貌的混合氧化物电极材料的设计策略可以为设计具有较高催化活性和实用的OER催化剂提供经验。Transition metal oxides and hydroxides have gradually become a new generation of oxygen evolution reaction(OER)catalysts due to their low cost and good activity.However,the high Tafel slope prevented them from replacing conventional Ir and Ru-based catalysts.In this paper,NiO nanosheets arrays were synthesized on the conductive ITO substrate by low-temperature self-deposition method,and then the NiO nanosheet arrays were modified based on the different activities of different cobalt salts in non-polar solvents(such as acetone),and mixed transition metal nanosheets arrays with different structures were successfully constructed.The introduction of chlorine salts would produce an etching effect on NiO nanosheets to generate porous CoNi-O nanosheets,while the introduction of nitrates would secondarily grow on the surface of NiO nanosheets to generate branched CoNi-O nanosheets.Furthermore,the introduction of Co salt not only endowed the material with a unique nanostructure,but also enhanced the oxygen evolution capability of the NiO nanosheet arrays.Compared with NiO nanosheets(56.9 mV/dec),the modified porous CoNi-O nanosheets(33.7 mV/dec)and branched CoNi-O nanosheets(29.1 mV/dec)have smaller Tafel slope in 0.1 mol/L KOH electrolyte.Therefore,the design strategy of constructing mixed oxide electrodes with different morphologies by surface modification can provide experience for the design of high performance and practical OER catalytic activity.

关 键 词：电催化剂 表面修饰 氧化物 析氧反应 

分 类 号：TQ116.21[化学工程—无机化工] TQ426