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A highly-efficient all-vanadium photoelectrochemical storage cell has been demonstrated in this work. This storage cell takes advantage of fast electrochemical kinetics of vanadium redox couples of VO 2+ /VO 2+ and V 3+ /V 2+ , and appears as a promising alternative to photoproduction of hydrogen from water. Continuous photocharging for 25h revealed a VO 2+...
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