Open AccessHeterointerface Engineering of Hierarchically Assembling Layered Double Hydroxides on Cobalt Selenide as Efficient Trifunctional Electrocatalysts for Water Splitting and Zinc‐Air Battery
Author(s) -
Song Junnan,
Chen Ying,
Huang Hongjiao,
Wang Jiajun,
Huang ShaoChu,
Liao YenFa,
Fetohi Amani E.,
Hu Feng,
Chen Hanyi,
Li Linlin,
Han Xiaopeng,
ElKhatib K. M.,
Peng Shengjie
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202104522
Subject(s) - overpotential , oxygen evolution , materials science , selenide , water splitting , cobalt , catalysis , heterojunction , electrochemistry , chemical engineering , battery (electricity) , electrocatalyst , nanotechnology , hydroxide , electrode , chemistry , optoelectronics , metallurgy , biochemistry , power (physics) , physics , selenium , photocatalysis , quantum mechanics , engineering
Engineering of structure and composition is essential but still challenging for electrocatalytic activity modulation. Herein, hybrid nanostructured arrays (HNA) with branched and aligned structures constructed by cobalt selenide (CoSe 2 ) nanotube arrays vertically oriented on carbon cloth with CoNi layered double hydroxide (CoSe 2 @CoNi LDH HNA) are synthesized by a hydrothermal‐selenization‐hybridization strategy. The branched and hollow structure, as well as the heterointerface between CoSe 2 and CoNi LDH guarantee structural stability and sufficient exposure of the surface active sites. More importantly, the strong interaction at the interface can effectively modulate the electronic structure of hybrids through the charge transfer and then improves the reaction kinetics. The resulting branched CoSe 2 @CoNi LDH HNA as trifunctional catalyst exhibits enhanced electrocatalytic performance toward oxygen evolution/reduction and hydrogen evolution reaction. Consequently, the branched CoSe 2 @CoNi LDH HNA exhibits low overpotential of 1.58 V at 10 mA cm −2 for water splitting and superior cycling stability (70 h) for rechargeable flexible Zn‐air battery. Theoretical calculations reveal that the construction of heterostructure can effectively lower the reaction barrier as well as improve electrical conductivity, consequently favoring the enhanced electrochemical performance. This work concerning engineering heterostructure and topography‐performance relationship can provide new guidance for the development of multifunctional electrocatalysts.