非晶态与晶态硫化钴/碳纳米管异质结用于高效电催化析氢  

Amorphous versus crystalline CoSx anchored on CNTs as heterostructured electrocatalysts toward hydrogen evolution reaction

作　　者：程长根 敖伟东 任会君 樊智帅 许婷婷 代磊 尹培群 Changgen Cheng;Weidong Ao;Huijun Ren;Zhishuai Fan;Tingting Xu;Lei Dai;Peiqun Yin(School of Biomedical Engineering,Anhui Medical University,Hefei 230032,China;School of Materials Science and Engineering,Henan University,Kaifeng 475004,China)

机构地区：[1]School of Biomedical Engineering,Anhui Medical University,Hefei 230032,China [2]School of Materials Science and Engineering,Henan University,Kaifeng 475004,China

出　　处：《Science China Materials》2023年第4期1383-1388,共6页中国科学（材料科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(22202059);the Start-Up Grants from Anhui Medical University and Henan University。

摘　　要：本研究采用简单的两步法合成了由非晶态硫化钴和碳纳米管结合形成的异质结CNT-a-CoS_(x)催化剂.与晶态CoS_(x)和碳纳米管形成的晶态CNT-c-CoS_(x)异质结催化剂相比,非晶态CNT-a-CoS_(x)具有丰富的活性位点、优异的电子输运特性和大的电化学活性面积等结构特性,因而在酸性电解质中表现出更高的电催化氢析出性能.达到10 m A cm^(-2)的阴极电流密度时,CNT-a-CoS_(x)所需的过电位仅为76 m V.更值得注意的是,经过60,000 s的电化学耐久性测试,未观察到明显的电催化性能下降.这一简单的原位构建异质结催化剂的策略为设计和合成活性高、稳定性好的非晶异质结电催化剂提供了技术支持.In this work,we have successfully constructed carbon nanotube(CNT)-a-CoS_(x)amorphous heterostructured catalysts using a two-step method.The abundant active sites,superior electron transport properties,and large electrochemically active specific surface area enable amorphous CNT-a-CoS_(x)to exhibit higher hydrogen evolution reaction performance than crystalline CNT-c-CoS_(x)in acidic conditions.To deliver a cathodic current density of 10 m A cm^(-2),the required overpotential is only 76 m V.No significant performance degradation is observed after 60,000 s of electrochemical durability test.This facile strategy provides technical support for the design and construction of amorphous heterostructured electrocatalysts with high activity and stability for the generation of green hydrogen.

关 键 词：阴极电流密度 电化学活性面积 非晶态 电催化剂 异质结 硫化钴 电子输运特性 耐久性测试 

分 类 号：TQ116.2[化学工程—无机化工] TQ426