Preparation And Electrochemical Performances Of Supported Transition Metal Compounds Nanocatalysts

With the goal of"carbon peaking and carbon neutrality",electrolytic hydrogen production is one of the greenest and cleanest hydrogen production processes available.Because of its high current density and high purity of hydrogen,acidic electrolytic water hydrogen production technology is of great interest to researchers.The design and development of catalysts for acidic electrolysis is the key to hydrogen production from electrolytic water.The acidic electrolyser mainly uses Pt,a precious metal,as the catalyst for the hydrogen evolution reaction（HER）and Ir/Ru oxides for the oxygen evolution reaction（OER）.The high cost limits its large-scale application,so the exploitation of low-cost,high-performance transition metal-based catalysts is the focus of current research.The main research in this paper is as follows:1.Synthesis of Mo O₂ nanospheres loaded on reduced graphene oxide（rGO）by hydrothermal reaction and their in situ conversion to 1T′-Mo Te₂ nanoparticles loaded with rGO（1T′-Mo Te₂ NPs/rGO）by tellurization reaction.The high specific surface area and excellent charge transport properties of rGO limit the agglomeration of1T′-Mo Te₂ NPs,which in turn exposes more reactive sites,improves the conductivity of the catalysts and promotes the electrochemical performance.Electrochemical tests showed that the catalyst has an overpotential（HER）of 520 m V at 1000 m A cm^-2 and good cycling stability.When 1T′-Mo Te₂ NPs/rGO has used as a supercapacitor electrode material,the specific capacitance of 1T′-Mo Te₂ NPs/rGO as an electrode is563 F g^-1 at 1 A g^-1,and the assembled 1T′-Mo Te₂ NPs/rGO//AC asymmetric supercapacitor has a high power density and excellent operational stability.This work has some reference value for the preparation of loaded HER transition metal compound nanocatalysts with high activity and multifunctionality by compounding excellent conductive matrixes.2.20%Eu-Mn Co₂O_4.5/TF loaded on Ti Foam（TF）was prepared by in situ pyrolysis of polymetallic nitrates.After doping with Eu elements,the Mn Co₂O_4.5loaded on the TF underwent a deformation from nano-sheet to nano-flower structure,further improved the acidic OER reactivity of Mn Co₂O_4.5/TF.TF as an effective matrix not only has a rich pores for optimized catalyst structure,but also has good corrosion resistance to ensure the stability of the catalyst.The acidic OER overpotential of 20%Eu-Mn Co₂O_4.5/TF was 365 m V(10 m A cm^-2)and was able to operate stably at this current density.This paper focuses on the preparation of loaded transition metal compound nanocatalysts for acidic electrolysis of water and the optimisation of their structure and properties to provide ideas for the development of efficient nanocatalysts.