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
李鑫 1李基宇 2包沙日勒敖都3
作者信息
- 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
- 折叠
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(H2O2),而利用4e-ORR氧化还原反应获得水(H2O),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-C3N4)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H2O2选择性.
Abstract
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 per-oxide(H2O2),while 4e-ORR is used to get water(H2O).In general,4e-ORR proceeds more readily,but the products of 2e-ORR are more valuable.Therefore,the investigation of electrocatalysts with excep-tional 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-C3N4)as pre-cursors.Experimental data demonstrate that CoGd-CNTs exhibits the highest oxygen reduction activity(ORR),while CoEu-CNTs displays exceptional H2O2 selectivity.
关键词
电化学/电催化/碳纳米管/氧还原反应/稀土金属Key words
electrochemistry/electrocatalysis/carbon nanotubes/oxygen reduction reaction/rare earth metals引用本文复制引用
出版年
2024
NETL
NSTL
万方数据