Kinetic-Thermodynamic Promotion Engineering toward High-Density Hierarchical and Zn-Doping Activity-Enhancing ZnNiO@CF for High-Capacity Desalination  

作　　者：Jie Ma Siyang Xing Yabo Wang Jinhu Yang Fei Yu 

机构地区：[1]College of Marine Ecology and Environment,Shanghai Ocean University,201306 Shanghai,People’s Republic of China [2]School of Civil Engineering,Kashi University,844000 Kashi,People’s Republic of China [3]Research Center for Environmental Functional Materials,College of Environmental Science and Engineering,Tongji University,1239 Siping Road,200092 Shanghai,People’s Republic of China [4]School of Chemical Science and Engineering,Tongji University,1239 Siping Road,200092 Shanghai,People’s Republic of China [5]Department of Energy,Environmental&Chemical Engineering,Washington University in St.Louis,St.Louis,MO 63130,USA

出　　处：《Nano-Micro Letters》2024年第8期35-50,共16页纳微快报（英文版）

基　　金：supported by The National Natural Science Foundation of China(22276137,52170087);the Fundamental Research Funds for the Central Universities(XJEDU2023Z009).

摘　　要：Despite the promising potential of transition metal oxides(TMOs)as capacitive deionization(CDI)electrodes,the actual capacity of TMOs electrodes for sodium storage is significantly lower than the theoretical capacity,posing a major obstacle.Herein,we prepared the kinetically favorable Zn_(x)Ni_(1−x)O electrode in situ growth on carbon felt(Zn_(x)Ni_(1−x)O@CF)through constraining the rate of OH^(−)generation in the hydrothermal method.Zn_(x)Ni_(1−x)O@CF exhibited a high-density hierarchical nanosheet structure with three-dimensional open pores,benefitting the ion transport/electron transfer.And tuning the moderate amount of redox-inert Zn-doping can enhance surface electroactive sites,actual activity of redox-active Ni species,and lower adsorption energy,promoting the adsorption kinetic and thermodynamic of the Zn_(0.2)Ni_(0.8)[e-mail] from the kinetic-thermodynamic facilitation mechanism,Zn_(0.2)Ni_(0.8)O@CF achieved ultrahigh desalination capacity(128.9 mgNaCl g^(-1)),ultra-low energy consumption(0.164 kW h kgNaCl^(-1)),high salt removal rate(1.21 mgNaCl g^(-1) min^(-1)),and good cyclability.The thermodynamic facilitation and Na^(+)intercalation mechanism of Zn_(0.2)Ni_(0.8)O@CF are identified by the density functional theory calculations and electrochemical quartz crystal microbalance with dissipation monitoring,respectively.This research provides new insights into controlling electrochemically favorable morphology and demonstrates that Zn-doping,which is redox-inert,is essential for enhancing the electrochemical performance of CDI electrodes.

关 键 词：Zinc-nickel metal oxide High-density hierarchical Capacitive deionization Zinc-doping 

分 类 号：O646[理学—物理化学]