Co_(3)O_(4)/CeO_(2)异质结制备及其在碱性介质中电催化析氧性能  

Co_(3)O_(4)/CeO_(2) Heterojunction:Preparation and Electrocatalytic Oxygen Evolution Performance in Alkaline Medium

作　　者：朱赛楠 王伟[1] 陶友荣 张心羽 吴兴才[1] 张墩明[1] ZHU Sai-Nan;WANG Wei;TAO You-Rong;ZHANG Xin-Yu;WU Xing-Cai;ZHANG Dun-Ming(School of Chemistry and Chemical Engineering,Key Laboratory of Mesoscopic Chemistry of MOE,State Key Laboratory of Coordination Chemistry,Nanjing University,Nanjing 210093,China)

机构地区：[1]南京大学化学化工学院,教育部介观化学重点实验室,配位化学国家重点实验室,南京210093

出　　处：《无机化学学报》2021年第7期1337-1344,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21673108);配位化学国家重点实验室开放基金(No.SKLCC1917)资助。

摘　　要：通过简易的两步法制备一系列Co_(3)O_(4)/CeO_(2)异质结。其结构、形貌和微结构分别通过X射线衍射(XRD)、扫描电镜(SEM)和高分辨透射电镜(HRTEM)表征。在碱性介质中,其电催化析氧性能随着Co_(3)O_(4)/CeO_(2)质量比的变化而变化,并有一最佳值。当Co_(3)O_(4)和CeO_(2)质量比为58.5%时,在1.0 mol·L^(-1) KOH溶液中,10 mA·cm^(-2)的电流密度下,过电位为347 mV,Tafel斜率为72.7 mV·dec-1,并且稳定性良好。此时的过电位低于Co_(3)O_(4)(440 mV)、商用RuO2(359 mV)和CeO_(2)(570 mV)。X射线光电子能谱(XPS)显示Co_(3)O_(4)的部分电子向CeO_(2)转移。这导致复合材料的导电性提高,CeO_(2)表面的氧空位浓度和活性氧物种增加。A series of Co_(3)O_(4)/CeO_(2) heterojunctions were prepared by a facile two⁃step method.Their structure and morphology were characterized by X⁃ray diffraction(XRD),scanning electron microscopy(SEM)and high resolution transmission electron microscopy(HRTEM)measurements,respectively.In alkaline media,electrocatalytic oxygen evolution performance test showed that the performance changed with the ratio of Co_(3)O_(4)/CeO_(2),and there was an optimal value.When the mass ratio of Co_(3)O_(4) and CeO_(2) was 58.5%,its overpotential was 347 mV which was lower than that of Co_(3)O_(4)(440 mV),commercial RuO2(359 mV)and CeO_(2)(570 mV),with Tafel slope of 72.7 mV·dec-1,and the good stability in 1.0 mol·L^(-1) KOH solution at current density of 10 mA·cm^(-2).X⁃ray photoelectronic energy spectra(XPS)confirmed that some of Co_(3)O_(4) electrons transferred to CeO_(2),which resulted in increase of the conductivity of the composite materials,the surface oxygen vacancy concentration,and active oxygen species of CeO_(2).

关 键 词：氧化物 异质结 电催化 析氧反应 碱性介质 

分 类 号：O643.3[理学—物理化学]