An aqueous Zn-polyoxometalate battery for decoupled hydrogen production from alkaline water electrolysis

Decoupled water electrolysis is a feasible technique for the large-scale production of high-purity H 2 , in which heteropolyacids are attractive electron-coupled proton buffers. An aqueous Zn-phosphomolybdic acid battery is designed for the simultaneous generation of reduced phosphomolybdic acid and...

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Published inSustainable energy & fuels Vol. 8; no. 11; pp. 2446 - 245
Main Authors Wang, Xin-Qing, Liu, Meng-Jiao, Wu, Xiao-Yuan, Wang, Sa-Sa, Wu, Weiming, Lu, Can-Zhong
Format Journal Article
LanguageEnglish
Published London Royal Society of Chemistry 28.05.2024
Subjects
Alkaline water
Buffers
Cobalt
Electrolysis
Hydrogen production
Nanoparticles
Nickel
Open circuit voltage
Phosphomolybdic acid
Platinum
Polyoxometallates
Protons
Ultrafines
Zinc
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Summary:Decoupled water electrolysis is a feasible technique for the large-scale production of high-purity H 2 , in which heteropolyacids are attractive electron-coupled proton buffers. An aqueous Zn-phosphomolybdic acid battery is designed for the simultaneous generation of reduced phosphomolybdic acid and electricity. The reported Zn-phosphomolybdic acid battery possesses an open circuit voltage of ∼1.50 V, and the coulombic efficiency of the Zn-phosphomolybdic acid battery can remain at a high level (>90%). Furthermore, the reduced phosphomolybdic acid can be used as an active electron-coupled proton buffer for efficient decoupled hydrogen production from alkaline water electrolysis in the presence of highly dispersed ultrafine Pt nanoparticles (∼2.0 nm) on nickel-cobalt hydroxide nanosheets at a low Pt loading (0.4 mg cm −2 ) as a free-standing electrode. An aqueous Zn-polyoxometalate battery was designed for decoupled H 2 production from water electrolysis with highly dispersed ultrafine Pt nanoparticles on nickel-cobalt hydroxide nanosheets at a low Pt loading as a free-standing HER electrode.
Bibliography:https://doi.org/10.1039/d4se00331d
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before and after the tests; SEM images of sample Pt-Ni/Co-Ni foam after the durability test; schematic illustration of phosphomolybdic acid-mediated alkaline water electrolysis with the decoupled OER and HER. See DOI
Electronic supplementary information (ESI) available: Experimental details for the preparation of H
P NMR and mass spectra of H
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loading of Pt nanoparticles on nickel-cobalt layered double hydroxide nanosheets, assembly of a Zn-phosphomolybdic acid battery and characterization; photographs of the aqueous Zn-phosphomolybdic acid battery and a clock driven by the aqueous Zn-phosphomolybdic acid battery; open circuit voltage plots, polarization curve and power density curve of the aqueous Zn-phosphomolybdic acid battery; polarization curves and open circuit voltage plots of the aqueous Zn-phosphomolybdic acid battery at various times; IR spectra
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ISSN:2398-4902
2398-4902
DOI:10.1039/d4se00331d