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A Polyoxometalate‐Based Binder‐Free Capacitive Deionization Electrode for Highly Efficient Sea Water Desalination
Author(s) -
Liu Hang,
Zhang Juan,
Xu Xinxin,
Wang Qiang
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201905606
Subject(s) - capacitive deionization , polyoxometalate , desalination , electrode , materials science , water desalination , capacitive sensing , water treatment , chemical engineering , environmental science , environmental engineering , chemistry , membrane , electrical engineering , engineering , catalysis , biochemistry
Abstract Capacitive deionization is a promising technique in sea water desalination. Compared with common electrodes, mixed capacitive‐deionization electrodes exhibit better performance in sea water desalination because they integrate pseudocapacitance and electric double‐layer capacitance in one system. Herein, a 3D binder‐free mixed capacitive‐deionization electrode was fabricated by direct electrodeposition of SiW 12 O 40 4− and polyaniline on a 3D exfoliated graphite carrier. In this electrode, SiW 12 O 40 4− /polyaniline composite particles with a size of about 100–120 nm are dispersed homogenously on the 3D exfoliated graphite carrier. Its specific capacitance reaches 352 F g −1 at 1 A g −1 . With increasing current from 1 to 20 A g −1 , the specific capacitance only decays by 32 %. When employed in sea water desalination, the performance of this mixed capacitive‐deionization electrode is also excellent. At 1.2 V, the salt adsorption capacity of this mixed electrode reaches 23.1 mg g −1 with a salt adsorption rate of 1.38 mg g −1 min −1 in 500 mg L −1 NaCl. The performance of this electrode is well retained after 30 cycles. The excellent sea water desalination performance originates from the synergistic effect between SiW 12 O 40 4− and polyaniline. This work has developed polyoxometalate as a new material for capacitive‐deionization electrodes.