Open AccessHighly Efficient Capacitive Deionization Enabled by NiCo 4 MnO 8.5 Electrodes
Author(s) -
Wang Wei,
Liu Zhenzhen,
Zhang Zehao,
Li Haibo
Publication year - 2022
Publication title -
global challenges
Language(s) - English
Resource type - Journals
ISSN - 2056-6646
DOI - 10.1002/gch2.202100095
Subject(s) - capacitive deionization , materials science , electrode , capacitance , electrochemistry , hydrothermal circulation , ternary operation , dielectric spectroscopy , desalination , chemical engineering , analytical chemistry (journal) , chemistry , environmental chemistry , membrane , computer science , engineering , programming language , biochemistry
The shortage of fresh water resources is one of the major challenges facing this planet. Capacitive deionization (CDI) techniques that are deemed to be highly efficient and require low capital cost have attracted widespread attention in the last few decades. In this work, the cubic ternary metal oxides NiCo 4 MnO 8.5 (Ni–Co–Mn–O) are synthesized by facile hydrothermal method for enhanced symmetrical CDI. Electrochemical measurements illustrate that the Ni–Co–Mn–O possesses low internal resistance and ion diffusion impedance. As a result, the salt removal capacity of the Ni–Co–Mn–O electrode increases from 26.84 to 65.61 mg g −1 by varying the voltage from 0.8 to 1.4 V in 1.0 × 10 −2 m NaCl solution, while the charge efficiency stabilizes at ≈80%. After 20 cycles, the capacitance retained is 64.27%, which is due to the irreversibility of Co 2+ /Co 3+ and Mn 2+ /Mn 3+ and the release of Ni 3+ from the Ni–Co–Mn–O electrode after long desalination/salination cycles.