| To meet the urgent need of clean and renewable energy for mankind.transition-metal based nanocomposites have received increasing interesting in constructing the next-generation electrocatalysts for implementation of water splitting technologies.However,the rational design of hybrid nanocomposites with control of hierarchical micro/mesoporous nanostructure,well-dispersion of metal and heteroatom doping remains an enormous challenge.The structure of transition-metal based nanocomposites is controllable,and transition-metal based nanoparticle could be incorporated into porous carbon uniformly by direct ion-exchange process,hydrothermal treatment and pyrolysis.The specific research results are as follows:1.a novel ionic pyridinium-containing porous micellar frameworks were prepared by hyper-crosslinking of core-shell unimolecular micelle（s-poly（tert-butyl acrylate）-b-poly（4-（bromomethyl）styrene））with linear poly（4-vinylpyridine）,which could load transition-metal-containing anions(MoO42-)directly by ionic exchange process.After hydrothermal reaction and pyrolysis under an argon atmosphere,nitrogen-doped porous carbons embedded with MoS2（MoS2@NPCs）possessing controlled hierarchical mico/mesoporous structure and well-distribution of metal sites were converted successfully,which exhibited highly and tunable electrocatalytic activity for the hydrogen evolution reaction（HER）under acidic conditions.2.Graphene was modified by poly（4-vinylpyridine）with two-dimensional graphene as a template,and the core-shell molecular micelles were covalently grafted（s-poly（tert-butyl acrylate）-b-poly（4-（bromomethyl）styrene））prepares a two-dimensional cationic supercrosslinked polymer.The molybdenum-based nanocomposites have better electrical conductivity.Through ion exchange and pyrolysis reactions,molybdenum carbide-doped two-dimensional multi-hole carbon nanocomposites are obtained.Electrochemical test results show that the composites have good electrocatalysis activity and stability. |
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