Precise Construction Of Tungsten-based Electrocatalyst Nanostructures And Hydrogen Precipitation Performance Study

With the goal of carbon peaking and neutrality set by our leaders at the 20th United Nations General Assembly,it is imperative that we reduce our dependence on fossil fuels in order to achieve these goals as soon as possible.Among the many alternative energy sources,hydrogen has a high calorific value of combustion,the product of combustion is water,which is not polluting to the environment and will help us to achieve the goal of carbon peaking and carbon neutrality as soon as possible.Electrocatalytic hydrogen production is one of the most convenient and simple ways to produce hydrogen,but building highly active and stable catalysts is a huge challenge.scale up of hydrogen energy applications.Transition metal tungsten-based materials have very great promise for electrocatalytic hydrogen precipitation applications because of their high accessibility and abundant electronic valence states.In this paper,we focus on tungsten-based nanomaterials as the main research content,through the doping,morphology control and heterogeneous interface construction of tungsten-based nanomaterials to achieve the precise construction of the nanostructure of tungsten-based nanomaterials,so as to prepare highly active electrocatalytic materials,the main research content is as follows:1.Using carbon fiber paper as the growth substrate and firstly grew WO₃ nanoarrays on its surface by hydrothermal solvent method,and then we successfully synthesized Fe-C-WN and Fe-N-WC nanoarrays by regulating the amount of ferrocene under Ar/NH₃ atmosphere using ferrocene-induced in situ gas-solid reaction based on WO₃.The crystalline phase transition of the materials from WN to WC can be achieved by varying the amount of ferrocene.The obtained Fe-C-WN and Fe-N-WC nanoarrays exhibited good HER electrocatalytic performance in alkaline and acidic electrolytes,respectively.Fe-C-WN required only 105 m V of overpotential to achieve a current density of 10 m A·cm^-2 under alkaline conditions,with a Tafel slope of 78 m V·dec^-1.Fe-N-WC requires an overpotential of only 98 m V to achieve a current density of 10 m A·cm^-2 under acidic conditions with a Tafel slope of 98 m V·dec^-1.The proposed strategy can be used to enrich energy storage and conversion applications of complex and high-performance materials2.Phosphotungstic acid as phosphorus and tungsten source and nickel foam as nickel source and template backbone by solvent hydrothermal method in one step to synthesize phosphorus-doped multi-interfacial Ni S/P-WS₂/Ni₃S₄（CNH-Ni WSP）with co-axial nanosheet hybridization structure for hydrogen production at full p H.Coaxially hybridized Ni S/WS₂/Ni₃S₄ is composed of strongly cross-linked WS₂ nanosheets and Ni S/Ni₃S₄nanoparticles with highly exposed heterogeneous interfaces and phosphorus doping,and its special coaxially hybridized nanosphere-level structure enables fast electron transfer,multi-interfacial electron effects arising from the different adsorption and desorption capacities of the interfaces and phosphorus doping on H^*,H₂O^*and H/OH^*CNH-Ni WSP requires only about 50 m V,58 m V and 180 m V overpotential to reach a current density of 10 m A cm^-2 under alkaline and acidic media and neutral conditions,respectively,and the proposed multi-interface construction strategy provides an idea for the preparation of efficient transition metal catalysts that can be used for the preparation of advanced energy conversion.