School of Materials Science and Engineering, Harbin Institute of Technology , Harbin 150001, China.
MOE Key Laboratory of Micro-Systems and Micro-Structures Manufacturing, Harbin Institute of Technology , Harbin 150080, China.
ACS Appl Mater Interfaces. 2017 Apr 5;9(13):11634-11641. doi: 10.1021/acsami.7b00899. Epub 2017 Mar 24.
Transition metal-based compounds are promising alternative nonprecious electrocatalysts for oxygen evolution to noble metals-based materials. Nanosheet-constructed hollow structures can efficiently promote the electrocatalystic activity, mainly because of their largely exposed active sites. Herein, hierarchical CoS hollow microplates with nanosheet building units are fabricated via sulfurization and subsequent calcination of preformed Co-glycolate microplates. Benefiting from the advantages of a hollow structure, nanosheet units and high Co content, CoS hollow microplates exhibit remarkable catalytic property for oxygen evolution reaction (OER) with low overpotential of 278 mV to reach a current density of 10 mA cm, a low Tafel slope of 53 mV dec, and satisfied stability. This construction method of CoS hierarchical hollow microplates composed of a nanosheet structure is an effective tactic for promoting OER performance of water splitting electrocatalysts.
基于过渡金属的化合物是一种很有前途的非贵金属析氧电催化剂，可替代贵金属基材料。纳米片构建的中空结构可以有效地提高电催化剂的活性，这主要是因为它们具有大量暴露的活性位点。本文通过预形成的 Co-乙二醇酸盐微板的硫化和随后的煅烧，制备了具有纳米片结构单元的分级 CoS 中空微板。受益于中空结构、纳米片单元和高 Co 含量的优势，CoS 中空微板在析氧反应（OER）中表现出显著的催化性能，过电位低至 278 mV 即可达到 10 mA cm 的电流密度，Tafel 斜率低至 53 mV dec，稳定性良好。这种由纳米片结构组成的 CoS 分级中空微板的构建方法是提高水分解电催化剂析氧性能的有效策略。
