Designing a multifunctional device that combines solar energy conversion and energy storage is an appealing and promising approach for the next generation of green power and sustainable society. In this work, we fabricated a single-piece device incorporating undoped WSe2, Re- or Nb-doped WSe2 photocathode, and zinc foil anode system enabling a light-assisted rechargeable aqueous zinc metal cell. Comparison of structural, optical, and photoelectric characteristics of undoped and doped WSe2 has further confirmed that ionic insertion of donor metal (rhenium and niobium) plays an important role in enhancing photoelectrochemical energy storage properties. The electrochemical energy storage cell consisting of Re-doped WSe2 (as the photoactive cathode and zinc metal as anode) showed the best photodriven enhancement in the specific capacitance of around 45% due to efficient harvesting of visible light irradiation. The assembled device exhibited a loss of 20% of its initial specific capacitance after 1500 galvanostatic charge-discharge cycles at 50 mA g-1. The cell also provided a specific energy density of 574.21 mWh kg1- and a power density of 5906 mW kg1- at 15 mA g-1. Under otherwise similar conditions, the pristine WSe2 and Nb-doped WSe2 showed photoenhanced induced capacitance of 43% and 27% at 15 mA g-1 and supplied an energy density of 436.4 mWh kg1- and 202 mWh kg1-, respectively. As a result, a reasonable capacitance improvement obtained by the Re-WSe2 photoenhanced zinc-ion capacitor could provide a facile and constructive way to achieve a highly efficient and low-cost solar-electrochemical capacitor system.

Department of Inorganic Chemistry University of Chemical and Technology Prague Technicka 5 166 28 Prague 6 Czech Republic

Fraunhofer Institute for Ceramic Technologies and Systems IKTS Maria Reiche Straße 2 01109 Dresden Germany

Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo nám 2 166 10 Prague 6 Czech Republic

Univ Lille CNRS Univ Polytechnique Hauts de France UMR 8520 IEMN F 59000 Lille France

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