钴-稀土双金属选择性电催化氧还原  

Cobalt-rare earth bimetallic selective catalyst for electrocatalytic oxygen reduction

作　　者：李鑫 李基宇 包沙日勒敖都 Li Xin;Li Jiyu;Bao Sharileaodu(The Economic and Technology Development ZonesBranch,Tongliao Bureau of Ecology and Environment,Tongliao 028000,Inner Mongolia,China;Horqin Branch Center,Tongliao Ecological Environment Technology Service Center,Tongliao 028000,Inner Mongolia,China;Tongliao Market Inspection and Testing Center,Tongliao 028000,Inner Mongolia,China)

机构地区：[1]通辽市生态环境局经济技术开发区分局,内蒙古通辽028000 [2]通辽市生态环境技术服务中心科尔沁区分中心,内蒙古通辽028000 [3]通辽市市场检验检测中心,内蒙古通辽028000

出　　处：《工业催化》2024年第8期53-57,共5页Industrial Catalysis

摘　　要：电催化氧化还原反应(ORR)有两电子(2e^(-))和四电子(4e^(-))两种反应,通常利用2e^(-)ORR氧化还原反应制备过氧化氢(H_(2)O_(2)),而利用4e^(-)ORR氧化还原反应获得水(H_(2)O),一般而言,4e^(-)ORR反应更容易进行,而2e^(-)ORR反应的产物更有价值。因此探究具有优异2e^(-)ORR选择能力的电催化剂具有重大意义。过渡金属钴(Co)化合物,具有优异的电催化氧还原活性,可催化诱导碳纳米管的生成。以稀土钐(Sm)、铕(Eu)、钆(Gd)、钴(Co)和氮化碳(g-C_(3)N_(4))为前驱体,通过高温固相合成稀土-钴双金属碳纳米管催化剂CoSm-CNTs、CoEu-CNTs和CoGd-CNTs,结果表明,CoGd-CNTs呈现出最佳的氧还原活性,而CoEu-CNTs展现出优异的H_(2)O_(2)选择性。Electrocatalytic oxygen reduction reaction(ORR)involves two types of reactions:two-electron(2e^(-))and four-electron(4e^(-))ORR.Typically,2e^(-)ORR is employed for the synthesis of hydrogen peroxide(H_(2)O_(2)),while 4e^(-)ORR is used to get water(H_(2)O).In general,4e^(-)ORR proceeds more readily,but the products of 2e^(-)ORR are more valuable.Therefore,the investigation of electrocatalysts with exceptional 2e^(-)ORR selectivity holds significant importance.Transition metal cobalt(Co)compounds exhibit remarkable electrocatalytic oxygen reduction activity and can catalyze the induction of carbon nanotubes.Rare-earth-cobalt dual-metal carbon nanotube catalysts,including CoSm-CNTs,CoEu-CNTs,and CoGd-CNTs,were synthesized by high-temperature solid-state synthesis method using samarium(Sm),europium(Eu),gadolinium(Gd),cobalt(Co),and graphitic carbon nitride(g-C_(3)N_(4))as precursors.Experimental data demonstrate that CoGd-CNTs exhibits the highest oxygen reduction activity(ORR),while CoEu-CNTs displays exceptional H_(2)O_(2) selectivity.

关 键 词：电化学 电催化 碳纳米管 氧还原反应 稀土金属 

分 类 号：TQ035[化学工程] TQ426.99