Preparation Of Heterogeneous Metal-Doped Transition Metal(Fe,Co,Ni)Compounds And Their Electrochemical Performance

Growing energy demand and limited fossil energy reserves,as well as growing ecological problems,have made the development of clean renewable energy a concern.Of the many sustainable energy sources currently discovered and developed,solar,wind and tidal energy are abundant,but their intermittent and unbalanced nature makes it necessary to develop energy storage/conversion systems.Hydrogen energy resources are widely distributed,easy to store,combustion products without impurities and high energy density,is one of the most potential energy development potential in the future.Electrochemical water decomposition is a promising technology for converting electrical energy into high-energy-density hydrogen fuels,with a high output and zero carbon emissions,and can be used flexibly with other renewable energy sources to store them in the form of chemical energy.Therefore,electrochemical water decomposition is an ideal sustainable clean energy production technology.The electrolytic water reaction consists of two semi-reactions: the hydl reaction of the cathode(HER)and the oxygenation reaction of the anode(OER).In order to effectively catalyze the water decomposition reaction,both cathode and anode require both efficient and stable electrocatalysts,but Pt and Ru/Ir-based precious metal materials are currently the most advanced electrocatalysts for hydrolysis,but their applicationisis is still limited by the high price and low reserves.Therefore,it is necessary and challenging to design low-cost,efficient electrocatalysts through eco-friendly synthesis strategies.This paper mainly targets high-efficiency,cheap and stable electrolytic water catalysts,which are designed with good catalytic activity through elemental doping,shape construction,material composite and other technologies.And the corresponding mechanism to explore,including the following three work:1)For the first time,Ce with 4f electrons and N were selected as guest atoms to be doped into the host catalyst of the Co P nanorod array.The co-doping of Ce and N significantly improved the intrinsic catalytic activity and kinetics of Co P.The material has efficient and stable hydrogen evolution performance under all p H conditions.This catalytic performance makes Ce and N co-doped Co P nanorod arrays a highly anticipated all p H resistant catalyst.2)The precursor Co Fe-PBA/CC was etched by low-temperature fluorination to form Co Fe F nanocubes with a face-centered recessed structure,which shortened the transfer path between charges and improved the reaction kinetics.In alkaline media,it shows excellent catalytic performance as an OER catalyst.3)ZIF67/CC,which grows well on conductive carbon cloth,was prepared by vapor deposition.Co2P-Co P/CC is then formed by low-temperature phosphating.The material shows excellent electrocatalytic performance in both HER and OER processes,and also shows good catalytic performance when used as a dual-functional catalyst for the overall water decomposition reaction And stability.