Engineering the interface of porous CoMoO_(3)nanosheets with Co_(3)Mo nanoparticles for high-performance electrochemical overall water splitting  

作　　者：Haibin Ma Xuejing Yang Zhili Wang Qing Jiang 

机构地区：[1]Key Laboratory of Automobile Materials,Ministry of Education,and School of Materials Science and Engineering,Jilin University,Changchun 130022,China

出　　处：《Journal of Materials Science & Technology》2023年第6期184-192,共9页材料科学技术（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.51901083 and 52130101);the Fundamental Research Funds for the Central Universities,and the funds of“World-class Universities and World-class Disciplines”.

摘　　要：The design of high-performance electrocatalysts for alkaline water splitting is of significant importance for the development of a sustainable hydrogen economy.Herein,heterostructured Co_(3)Mo nanoparti-cles/porous CoMoO_(3)nanosheets(Co_(3)Mo/CoMoO_(3)NPSs)were constructed for alkaline water splitting by annealing CoMoO x nanosheets under controlled atmospheres.Thanks to its interfacial electronic structure and increased electrochemical active area,Co_(3)Mo/CoMoO_(3)NPSs exhibit impressive hydrogen evolution reaction(HER)activity with an overpotential of 334 mV at 1000 mA cm^(-2) and a Tafel slope of 46.4 mV per decade in 1.0 M KOH,which outperforms Pt/C catalyst(621 mV and 74.7 mV per decade).Density functional theory calculations illustrate the electron transfer from Co_(3)Mo to CoMoO_(3)at the interfaces,where electron accumulation on CoMoO_(3)favors the dissociation of H_(2)O molecule,and electron-deficient Co atoms in Co_(3)Mo have optimized H∗absorption energy for HER.The Co_(3)Mo/CoMoO_(3)NPSs also exhibit higher oxygen evolution reaction activity than the RuO_(2)catalyst.Moreover,the water electrolyzer us-ing Co_(3)Mo/CoMoO_(3)NPSs as both cathode and anode only requires 1.59 V to deliver a current density of 100 mA cm^(-2)in 1.0 M KOH,which outperforms benchmark Pt/C||RuO_(2)electrodes couple with 1.69 V to reach the same current density,providing great potential for large-scale applications.

关 键 词：Interface engineering HETEROSTRUCTURES Interfacial electronic structure Hydrogen evolution reaction Overall water splitting 

分 类 号：TQ116.2[化学工程—无机化工] TQ426