Exploring highly active and stable transition metal-based bifunctional electrocatalysts has recently attracted extensive research interests for achieving high inherent activity,abundant exposed active sites,rapid mass transfer,and strong structure stability for overall water splitting.Herein,an interface engineering coupled with shell-protection strategy was applied to construct three-dimen-sional(3D)core-shell NixSy@MnOxHy het-erostructure nanorods grown on nickel foam(NixSv@MnOxHv/NF)as a bifunctional elec-trocatalyst.NixSy@MnOxHy/NF was synthesized via a facile hydrothermal reaction followed by an electrodeposition process.The X-ray absorption fine structure spectra reveal that abundant Mn-S bonds connect the hetero structure interfaces of NixSy@MnOxHy,leading to a strong electronic interaction,which improves the intrinsic activities of hydrogen evolution reaction and oxygen evolution reaction(OER).Besides,as an efficient protective shell,the MnOxHy dramatically inhibits the electrochemical corrosion of the electrocatalyst at high cur-rent densities,which remarkably enhances the stability at high potentials.Furthermore,the 3D nanorod structure not only exposes enriched active sites,but also accelerates the electrolyte diffusion and bubble desorption.Therefore,NixSy@MnOxHy/NF exhibits exceptional bifunctional activity and stability for overall water splitting,with low overpotentials of 326 and 356 mV for OER at 100 and 500 mA cm-2,respectively,along with high stability of 150 h at 100 mA cm-2.Furthermore,for overall water splitting,it presents a low cell voltage of 1.529 V at 10 mA cm-2,accompanied by excellent stability at 100 mA cm-2 for 100 h.This work sheds a light on exploring highly active and stable bifunctional electrocatalysts by the interface engineering coupled with shell-protection strategy.

Pan Wang;Yuanzhi Luo;Gaixia Zhang;Zhangsen Chen;Hariprasad Ranganathan;Shuhui Sun;Zhicong Shi

Institute of Batteries,School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,People's Republic of China;énergie Matériaux Télécommunications Research Centre,Institut National de La Recherche Scientifique(INRS),Varennes,Québec J3X 1P7,Canada;The Key Laboratory of Fuel Cell Technology of Guangdong Province,School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510641,People's Republic of China

纳微快报（英文）

[1]Pan Wang;Yuanzhi Luo;Gaixia Zhang;Zhangsen Chen;Hariprasad Ranganathan;Shuhui Sun;Zhicong Shi-.Interface Engineering of NixSy@MnOxHy Nanorods to Efficiently Enhance Overall-Water-Splitting Activity and Stability)[J].纳微快报（英文）,2022(07):246-262

MnOxHy,NixSv,MnOxHv

Interface,Engineering,NixSy,Nanorods,Efficiently,Enhance,Overall,Water,Splitting,Activity,Stability,Exploring,highly,active,stable,transition,metal,bifunctional,electrocatalysts,has,recently,attracted,extensive,research,interests,achieving,inherent,activity,abundant,exposed,sites,rapid,mass,transfer,strong,stability,overall,water,splitting,Herein,engineering,coupled,shell,protection,strategy,was,applied,construct,three,dimen,sional,core,erostructure,nanorods,grown,nickel,foam,synthesized,via,facile,hydrothermal,reaction,followed,by,electrodeposition,process,ray,absorption,fine,spectra,reveal,that,bonds,connect,hetero,interfaces,leading,electronic,interaction,which,improves,intrinsic,activities,hydrogen,evolution,oxygen,OER,Besides,efficient,protective,dramatically,inhibits,electrochemical,corrosion,cur,densities,remarkably,enhances,Furthermore,not,only,exposes,enriched,but,also,accelerates,electrolyte,diffusion,bubble,desorption,Therefore,exhibits,exceptional,overpotentials,mV,mA,respectively,along,presents,voltage,accompanied,excellent,This,work,sheds,light,exploring

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