Kinetic-Thermodynamic Promotion Engineering toward High-Density Hierarchical and Zn-Doping Activity-Enhancing ZnNiO@CF for High-Capacity DesalinationOACSTPCDEI
Kinetic-Thermodynamic Promotion Engineering toward High-Density Hierarchical and Zn-Doping Activity-Enhancing ZnNiO@CF for High-Capacity Desalination
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 pre-pared the kinetically favorable ZnxNi1-xO electrode in situ growth on carbon felt(ZnxNi1-xO@CF)through constraining the rate of OH-generation in the hydrothermal method.ZnxNi1-xO@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 Zn0.2Ni08O@CF.Benefitting from the kinetic-thermodynamic facilitation mechanism,Zn0.2Ni0.8O@CF achieved ultrahigh desalination capacity(128.9 mgNao 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 ther-modynamic facilitation and Na+intercalation mechanism of Zn0.2Ni0.8O@CF are identified by the density functional theory calculations and electrochemi-cal 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.
Jie Ma;Siyang Xing;Yabo Wang;Jinhu Yang;Fei Yu
College of Marine Ecology and Environment,Shanghai Ocean University,201306 Shanghai,People's Republic of China||School of Civil Engineering,Kashi University,844000 Kashi,People's Republic of China||Research Center for Environmental Functional Materials,College of Environmental Science and Engineering,Tongji University,1239 Siping Road,200092 Shanghai,People's Republic of ChinaSchool of Civil Engineering,Kashi University,844000 Kashi,People's Republic of China||Research Center for Environmental Functional Materials,College of Environmental Science and Engineering,Tongji University,1239 Siping Road,200092 Shanghai,People's Republic of China||Department of Energy,Environmental & Chemical Engineering,Washington University in St.Louis,St.Louis,MO 63130,USASchool of Civil Engineering,Kashi University,844000 Kashi,People's Republic of ChinaSchool of Chemical Science and Engineering,Tongji University,1239 Siping Road,200092 Shanghai,People's Republic of ChinaCollege of Marine Ecology and Environment,Shanghai Ocean University,201306 Shanghai,People's Republic of China
Zinc-nickel metal oxideHigh-density hierarchicalCapacitive deionizationZinc-doping
《纳微快报（英文）》 2024 (008)
35-50 / 16
This research is supported by The National Natural Science Foundation of China(22276137,52170087)and the Fundamental Research Funds for the Central Universities(XJE-DU2023Z009).We are also thankful to the anonymous reviewers for their valuable comments to improve this manuscript.
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