One-pot solvothermal synthesis of hierarchical Co-doped NiO microspheres with enhanced hydrogen sulfide sensing performances  

作　　者：Wenjing Du Jinbo Zhao Fenglong Wang Huan Yang Ling Chen Xingyu Yao Lili Wu Jiurong Liu 

机构地区：[1]College of Materials Engineering,Henan Key Laboratory of Electronic Ceramics Materials and Application,Henan International Joint Laboratory of Rare Earth Composite Materials,Henan University of Engineering,Zhengzhou 451191,China [2]School of Materials Science and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250100,China [3]Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,Ministry of School of Materials Science and Engineering,Shandong University,Jinan 250061,China [4]Department of Chemical Engineering and Safety,Binzhou University,Binzhou 256600,China

出　　处：《ChemPhysMater》2023年第4期337-345,共9页化学物理材料（英文）

基　　金：The authors acknowledge the financial support from the National Natural Science Foundation of China(No.52202168);Key Sci-entific Research Project Plan of Henan Province(No.22B430009 and 21B140002);Natural Science Foundation of Shandong Province(ZR2019QF012 and ZR2022MF311);Shandong Key Research and Development Program(2019JZZY010312).

摘　　要：In this study we report,for the first time,the synthesis of Co-doped NiO microspheres assembled by two-dimension nanosheets using a facile solvothermal method.The H 2 S gas-sensing performance of the as-prepared samples was systematically investigated.The result demonstrates that the Co–NiO sensor with Co/Ni molar ratio of 1%(1%Co–NiO)exhibits high response(12.9)and rapid response speed(110 s)to 20×10^(−6) H_(2)S at 200℃ in comparison with the pure NiO sensor.Moreover,excellent selectivity,repeatability,and stability were achieved.The sensing mechanism illustrates that the superior gas-sensing properties can be attributed to two factors.(1)The hierarchical microspherical construction with an ultrahigh specific surface area of 163.1 m^(2)g^(−1) provides adequate active sites for H_(2)S gas adsorption,porous structures,and an interlayer gap that accelerates the diffusion of H_(2)S gas,resulting in improved sensitivity and response speed of the sensor.(2)Co-doping results in a decrease in the particle sizes(ca.4 nm)and increase in the number of adsorbed ionized oxygen species,which improves sensitivity and selectivity.Therefore,this study provides a facile approach for the synthesis of hierarchical Co–NiO microspheres with enhanced H_(2)S gas-sensing performance.

关 键 词：Co-doped NiO Gas sensor Hierarchical microspheres Hydrogen sulfide 

分 类 号：TQ116.2[化学工程—无机化工]