Synergism and anion-cation dual chemical substitution in heterostructure sprouted on MXene enable high-efficiency and stable overall water splitting  

作　　者：Zepeng Lv Jinshuai Fei Yang You Xuewei Lv Qian Li Jie Dang 

机构地区：[1]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [2]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China [3]State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China

出　　处：《Journal of Materials Science & Technology》2023年第16期207-216,共10页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52222408);the Fundamental Research Funds for the Central Universities(No.2020CDJGFCL004);the Fok Ying Tung Education Foundation(No.171111);the Joint Fund between Shenyang National Laboratory for Materials Science and State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals(No.18LHPY015).

摘　　要：The exploration of novel,super-potent and low-cost electrocatalysts for water splitting has always been the kernel in the field of renewable sources.Herein,exfoliated Ti_(3)C_(2)T_(x) MXenes work as a substrate to vertically grow polypore N,Ni-Co2P nanoarrays(N,Ni-Co2P@TC)through an in situ interface-growth strategy and subsequent phosphorization and nitridation.The well-defined heterointerfaces with positive and negative ions co-modulation as coupled hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)catalysts for efficient overall water splitting are investigated,which possesses excellent durability even at a large current density(±500 mA cm^(-2)).For HER,suitable H_(2)O∗and H∗absorption energies and accelerated electronic transmission make N,Ni-Co2P@TC display a low overpotential of 27 mV at-10 mA cm^(-2) and Tafel slope of 38 mV dec^(–1) in 1 mol/L KOH.For OER,the synergy of N,Ni-Co2P@TC with selfreconfiguration can give enhanced activity with a low overpotential of 232 mV at 10 mA cm^(-2) and a Tafel slope of 57 mV dec^(–1).Additionally,the excellent bifunctional activity allows easily combining for efficient overall water splitting with a low driving voltage(1.51 V)at 10 mA cm^(-2),and the electrolyzer can be driven by a 1.5 V AAA battery.

关 键 词：Synergism Chemical substitution HETEROSTRUCTURE Overall water splitting MXene 

分 类 号：TQ116.2[化学工程—无机化工] TQ426