Browsing by Author "Wang, Xuyun"

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    Correction: Layer-structured FeCo bihydroxide as an ultra-stable bifunctional electrocatalyst for water splitting at high current densities
    (Royal society of chemistry, 2021) Sun, Chaoyanga; Ji, Shanb; Wang, Xuyun; Hui, Wang; Linkov, Vladimir
    The development of stable bifunctional electrodes capable of operation at high current densities is a key requirement for large scale hydrogen generation by water electrolysis. Herein, amorphous FeCo hydroxides are controllably electroplated onto nickel mesh to produce binder-free bifunctional FeCo-LDH/NM electrodes for water splitting. In an alkaline electrolyte, the hydrogen evolution reaction on FeCo-LDH/NM requires an overpotential of only 311 mV to deliver a current density of 1000 mA cm−2, and the same current density is achieved in the oxygen evolution reaction at 300 mV. Notably, in a real electrolyzer setup, a current density of 1000 mA cm−2 is realized at 1.82 V and remains unchanged for 150 h. The study demonstrates promising bifunctional electrocatalytic properties of the FeCo-LDH/NM electrode material making it a suitable candidate for practical applications in large-scale water electrolysis systems.
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    Selectivity of oxygen evolution reaction on carbon cloth-supported δ-mno2 nanosheets in electrolysis of real seawater
    (Molecules, 2023) Linkov, Vladimir; Ji, Shan; Yan, Haofeng; Wang, Xuyun; Wang, Rongfang
    Electrolysis of seawater using solar and wind energy is a promising technology for hydrogen production which is not affected by the shortage of freshwater resources. However, the competition of chlorine evolution reactions and oxygen evolution reactions on the anode is a major obstacle in the upscaling of seawater electrolyzers for hydrogen production and energy storage, which require chlorine-inhibited oxygen evolution electrodes to become commercially viable. In this study, suchan electrode was prepared by growing δ-MnO2 nanosheet arrays on the carbon cloth surface. The selectivity of the newly prepared anode towards the oxygen evolution reaction (OER) was 66.3% after 30 min of electrolyzer operation. The insertion of Fe, Co and Ni ions into MnO2 nanosheets resulted in an increased number of trivalent Mn atoms, which had a negative effect on the OER selectivity. Good tolerance of MnO2/CC electrodes to chlorine evolution in seawater electrolysis indicates its suitability for upscaling this important energy conversion and storage technology