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Synergistically boosting the elementary reactions over multiheterogeneous ordered macroporous Mo2C/NC-Ru for highly efficient alkaline hydrogen evolution

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Carbon Energy 2022年第5期4卷 856-866页

作者： Kaixi Wang Shuo Wang Kwan San Hui Haixing Gao Duc Anh Dinh Chengzong Yuan Chenyang Zha Zongping Shao Zikang Tang Kwun Nam Hui Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoTaipaMacao SARChina School of Engineering Faculty of ScienceUniversity of East AngliaNorwichUK NTT Hi-Tech Institute Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjingChina WA School of Mines:Minerals Energy and Chemical Engineering(WASM-MECE)Curtin UniversityPerthWestern AustraliaAustralia

Simultaneously enhancing the reaction kinetics,mass transport,and gas release during alkaline hydrogen evolution reaction(HER)is critical to minimizing the reaction polarization resistance,but remains a big *** rational design of a hierarchical multiheterogeneous three-dimensionally(3D)ordered macroporous Mo_(2)C-embedded nitrogen-doped carbon with ultrafine Ru nanoclusters anchored on its surface(OMS Mo_(2)C/NC-Ru),we realize both electronic and morphologic engineering of the catalyst to maximize the electrocatalysis *** formed Ru-NC heterostructure shows regulative electronic states and optimized adsorption energy with the intermediate H*,and the Mo_(2)C-NC heterostructure accelerates the Volmer reaction due to the strong water dissociation ability as confirmed by theoretical ***,superior HER activity in alkaline solution with an extremely low overpotential of 15.5 mV at 10 mAcm^(−2)with the mass activity more than 17 times higher than that of the benchmark Pt/C,an ultrasmall Tafel slope of 22.7 mV dec−1,and excellent electrocatalytic durability were achieved,attributing to the enhanced mass transport and favorable gas release process endowed from the unique OMS Mo_(2)C/NC-Ru *** oxidizing OMS Mo_(2)C/NC-Ru into OMS MoO_(3)-RuO_(2)catalyst,it can also be applied as efficient oxygen evolution electrocatalyst,enabling the construction of a quasi-symmetric electrolyzer for overall water *** a device's performance surpassed the state-of-the-art Pt/C||RuO2 *** study provides instructive guidance for designing 3D-ordered macroporous multicomponent catalysts for efficient catalytic applications.

关键词： heterostructure hydrogen evolution reaction molybdenum carbide ordered macroporous structure ruthenium nanoparticle synergistic effect

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Ultrasamll Ru nanoparticles Highly Dispersed on Sulfur Doping Graphene for HER with High Electrocatalytic Performance

Ultrasamll Ru Nanoparticles Highly Dispersed on Sulfur Dopin...

引用

河南省化学会2020年学术年会

作者： Yu Liu Baofan Wu Haichang Chang Xin Wang Jing Chen Xuzhuo Sun College of Chemistry and Chemical Engineering Henan University of Technology

Nanostructuring and metal-support interactions have been explored as efficient strategies to improve the electrocatalytic activity in heterogeneous *** this study,we have fabricated the ultrasmall Ru nanoparticles dispersed on S doping graphene (denoted as Ru/S-rGO) by a facile"one-pot"*** was found that both the S doping and moderate degree of oxidization of GO can induce the formation and high dispersion of the ultrasmall Ru nanoparticles (NPs) with larger electrochemically active surface areas for exposing more active *** metal-support interaction between the S-doped graphene and Ru nanoparticles was observed from the XPS and electronic charge-differences *** resulted in the decrease in the electron density of Ru,which facilitated the electrons release from HO and the H–OH bond *** results of the density functional theory (DFT) calculation further confirmed that the S dopants can reduce the energy barrier of breaking H–OH bond to accelerate the water dissociation during the alkaline *** current density 20 m A cm,lowest overpotential of 14 mV,superior to the benchmark Pt/C in alkaline solution,was observed for Ru/*** observed lowest value of overpotential was due to the ultrasmall size,high dispersion and strong metal-support ***/S-rGO-24 also exhibited remarkable stability and high catalytically durability in 1 M KOH solution.

关键词： ruthenium nanoparticle S doping graphene Metal-support interaction High performance Hydrogen evolution reaction

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