Preparation Of High Activity Electrocatalysts Based On Heteroatom Doping And Their Applications In Water Splitting

With the rapid development of society and economy,energy problem becomes more and more serious.As a kind of green and sustainable energy with zero carbon source,hydrogen（H₂）energy is regarded as the most ideal new energy.Among many advanced technologies for hydrogen production,electrochemical water splitting is a simple and clean method to produce H₂ on a large scale.At present,the precious metal-based materials,such as Pt,are very good catalysts for the electrolysis of water.However,rareness and high expense are the major drawbacks in their wide application.Therefore,the development of non-noble metal catalyst is urgent.The key to the design of high performance and high stability water splitting materials lies in stable electronic structure,good electrical conductivity and abundant active sites.Based on the above design principles,the specific research work of this paper is as follows:（1）Mn doped Ni₂P microflowers directly grown on Ni foam were successfully synthesized by via a facile hydrothermal method and phosphorization treatment.Compared with single component Ni₂P catalyst,Mn doped Ni₂P catalyst has better electrocatalytic performance in alkaline medium.Meanwhile,benefiting from the porous microflower structure and the strong electron interactions between Mn,Ni and P,the Mn doped Ni₂P with an optimal Mn/Ni ratio of 0.053 exhibits the best electrocatalytic activity for both HER and OER,together with high stability.（2）Co doped Ni_0.85Se nanoparticles supported on RGO were successfully synthesized via a simple hydrothermal method.Compared with pure Ni_0.85Se nanoparticles and Ni_0.85Se/RGO,the hydrogen evolution performance of Co doped Ni_0.85Se/RGO is significantly improved in both acidic and alkaline media.This is attributed to the fact that RGO with high specific surface area can effectively reduce the agglomeration of nanoparticles and expose more active sites.Besides,the effective doping of Co can optimize the electronic structure of Ni_0.85Se and improve the interaction between Ni_0.85Se and support RGO,thus improving the catalytic HER performance.（3）P-doped CoMoO₄/RGO was successfully synthesized by via a facile reflux method and phosphorization treatment.Compared with CoMoO₄/RGO,P-doped CoMoO₄/RGO has significantly higher hydrogen evolution electrocatalytic activity in alkaline medium,accompanying with high stability.This is attributed to the introduction of P in both RGO and CoMoO₄,which enhances the interaction between the nanorod and the support,thus leading to a large exposed active surface and good electrical conductivity.