文献类型：期刊文献

中文题名：In-situ growth of heterophase Ni nanocrystals on graphene for enhanced catalytic reduction of 4-nitrophenol

作者：Jiahao Zhuang[1,2];Feng He[3];Xianglin Liu[4];Pengchao Si[1,2];Fangna Gu[2];Jing Xu[4];Yu Wang[2];Guangwen Xu[3];Ziyi Zhong[5,6];Fabing Su[2,3]

机构：[1]School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;[2]State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;[3]Key Laboratory on Resources Chemicals and Materials of Ministry of Education,Shenyang University of Chemical Technology,Shenyang 110142,China;[4]State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;[5]Department of Chemical Engineering,Guangdong Technion-Israel Institute of Technology(GTIIT),Shantou 515063,China;[6]Technion-Israel Institute of Technology(IIT),Haifa 32000,Israel

年份：2022

卷号：15

期号：2

起止页码：1230

中文期刊名：Nano Research

外文期刊名：纳米研究（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2021_2022】；PubMed;

基金：funded by the National Natural Science Foundation of China(No.21776286).

语种：英文

中文关键词：heterophase structure;Ni nanocrystals;graphene;4-nitrophenol(4-NP)reduction;catalysts

摘要：Generating heterophase structures in nanomaterials,e.g.,heterophase metal nanocrystals,is an effective way to tune their physicochemical properties because of their high-energy nature and unique electronic environment of the generated interfaces.However,the direct synthesis of heterophase metal nanocrystals remains a great challenge due to their unstable nature.Herein,we report the in situar direct synthesis of heterophase Ni nanocrystals on graphene.The heterostructure of face-centered cubic(fee)and hexagonal close-packed(hep)phase was generated via the epitaxial growth of hep Ni and the partial transformation of fee Ni and stabilized by the anchoring effect of graphene toward fee Ni nanocrystal and the preferential adsorption of surfactant polyethylenimine(PEI)toward epitaxial hep Ni.Comparing with the fee Ni nanocrystals grown on graphene,the heterophase(fcc/hcp)Ni nanocrystals in situ grown on graphene showed a greatly improved catalytic activity and reusability in 4-nitrophenol(4-NP)reduction to 4-aminophenol(4-AP).The measured apparent rate constant and the activity parameter were 2.958 min^(-1) and 102 min^(-1)·mg^(-1),respectively,higher than that of the best reported non-noble metal catalysts and most noble metal catalysts.The control experiments and density functional theory calculations reveal that the interface of the fee and hep phases enhances the adsorption of substrate 4-NP and thus facilitates the reaction kinetics.This work proves the novel idea for the rational design of heterophase metal nanocrystals by employing the synergistic effect of surfactant and support,and also the potential of creating the heterostructure for enhancing their catalytic reactivity.