高活性自支撑钴镍硫化物析氧催化剂  

Highly active self-supporting cobalt-nickel sulfide oxygen evolution catalysts

作　　者：曾晓辉 杨洁[1] 陈洪伟 杨浩瑜 谢娟[1] 王虎[1] ZENG Xiaohui;YANG Jie;CHEN Hongwei;YANG Haoyu;XIE Juan;WANG Hu(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,Sichuan,China)

机构地区：[1]西南石油大学新能源与材料学院,四川成都610500

出　　处：《精细化工》2025年第2期354-361,共8页Fine Chemicals

基　　金：四川省产教融合示范项目(川财教[2022]106号)。

摘　　要：调节前驱液中n(Co)∶n(Ni),采用水热法在泡沫镍(NF)上负载两种双金属硫化物(NiCo_(2)S_(4)、Ni_(2)CoS_(4))制备了析氧催化剂NiCo_(2)S_(4)/NF和Ni_(2)CoS_(4)/NF。采用SEM、XRD、XPS对催化剂进行了表征,并进行了电化学性能测试,考察了n(Co)∶n(Ni)(1∶2~3∶2)对催化剂结构形貌、元素组成和析氧性能的影响。结果表明,当n(Co)∶n(Ni)=1∶2时,得到的金属硫化物为立方相Ni_(2)CoS_(4);当n(Co)∶n(Ni)≥1后,得到的金属硫化物为立方相NiCo_(2)S_(4)。当n(Co)∶n(Ni)=1∶1时,制备的NiCo_(2)S_(4)/NF比Ni_(2)CoS_(4)/NF具有更优异的析氧反应(OER)性能,当电流密度为20 mA/cm^(2)时,其过电位仅为216 mV,Tafel斜率为72 mV/dec,具有更大的电化学活性面积、低的电荷转移电阻。在OER过程中,催化剂表面形成的MOOH(M=Co、Ni)有利于OER的进行;密度泛函理论计算表明,NiCo_(2)S_(4)发生OER需要的吉布斯自由能更低。Oxygen evolution catalysts NiCo_(2)S_(4)/NF and Ni_(2)CoS_(4)/NF were prepared via hydrothermal method by loading two kinds of bimetallic sulfides(NiCo_(2)S_(4)and Ni_(2)CoS_(4))on nickel foam(NF)and adjusting n(Co)∶n(Ni)in the precursor,characterized by SEM,XRD as well as XPS,and evaluated for its electrochemical performance.The effects of n(Co)∶n(Ni)(1∶2~3∶2)on the structural morphology,elemental composition,and oxygen evolution performance of the catalysts were further analyzed.When n(Co)∶n(Ni)=1∶2,the metal sulfide obtained was of cubic phase Ni_(2)CoS_(4),while when n(Co)∶n(Ni)≥1,that was of cubic phase NiCo_(2)S_(4).The NiCo_(2)S_(4)/NF prepared with n(Co)∶n(Ni)=1∶1 exhibited better oxygen evolution reaction(OER)performance than Ni_(2)CoS_(4)/NF.At a current density of 20 mA/cm^(2),NiCo_(2)S_(4)/NF exhibited an overpotential of only 216 mV,Tafel slope of 72 mV/dec,indicating a larger electrochemical active area and lower charge transfer resistance.During the OER process,MOOH(M=Co,Ni)formed on the surface of catalyst were conducive to the progress of OER.Density functional theory calculations revealed that NiCo_(2)S_(4)required lower Gibbs free energy for OER.

关 键 词：泡沫镍 钴镍硫化物 析氧反应 催化技术 

分 类 号：TQ116.21[化学工程—无机化工] TQ426