| Energy is a necessity for people's daily life and social progress,as well as it plays a significant role in the national economy.Faced with the increasing demand for energy and the seriousness of environmental pollution,the search for clean and sustainable energy has already been a pressing task for human being.Hydrogen?H2?is considered an ideal clean energy because of its high heating value and the environmental protection characteristics of combustion products,and it will play an important role in the future energy map.However,hydrogen does not exist naturally and needs to be prepared by a certain method.The electrocatalytic hydrogen decomposition reaction?HER?is an important semi-reaction of water decomposition.This is the way to a viable future for recyclable clean energy.Nowadays,noble metal platinum-based materials are still the most advanced HER catalysts under acidic and alkaline conditions.In this regard,the development of non-noble metal HER catalysts to replace Pt has been one of the focuses of the past decades.In this thesis,the redox solid-phase reaction?SPR?is adopted to increase the active defects and electron transport capacity of Mo S2,which improves the catalytic performance.The research content includes:1.the porous Mo S2/Mo O2 hybrid was successfully fabricated by a facile hard template strategy based on redox solid-phase reaction?SPR?.Firstly,Fe2O3/Mo S2composite were prepared via an in-situ growth method.After the redox SPR between Mo S2 and Fe2O3,part of Fe2O3 were transformed into Fe3O4 phase,whilst some Mo O2was instead of Mo S2.After the etching of Fe2O3and Fe3O4 NPs in precursor Mo S2/Mo O2/Fe3O4/Fe2O3,designed Mo S2/Mo O2 hybrid was obtained.Different techniques were adapted to reveal the well-defined phase interfaces between Mo S2 and Mo O2,which contained plenty of unsaturated Mo,S,and O active.The obtained porous Mo S2/Mo O2 hybrid was investigated for HER in alkaline.The low overpotential of 157m V at 10 m A·cm-2 and the excellent cycling stability demonstrate the remarkable catalytic activity of porous Mo S2/Mo O2 hybrid.2.When further O-doping on the surface of Mo S2 by solid-phase reaction,the ultra-thin carbon layer-coated ruthenium with high catalytic activity was successfully loaded on the surface of Mo S2,and the synergistic effect between multiple interfaces was more conducive to the dissociation of water and hydrogen adsorption.By adjusting the addition amount of ruthenium acetylacetonate,the obtained C@Ru0.5/Mo O2/Mo S2catalyst showed excellent electrolytic water performance similar to commercial Pt/C in both alkaline and acid electrolytes.In addition,it has high cycle stability in both alkaline and acid electrolytes.The results prove that the defect engineering and interface engineering of Mo S2 should be carried out through solid phase instead,so as to achieve higher exposure of catalytic active sites and adjust the electronic structure to enhance the intrinsic activity provides a new strategy. |
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