Simultaneous power generation and CO2valorization by aqueous Al-CO2batteries using nanostructured Bi2S3as the cathode electrocatalyst

There is an increasing awareness of the need to pursue energy solutions with a low carbon footprint. The conventional power generation process (e.g.combustion of fossil fuels) is typically accompanied by CO(2)emission. It would be very appealing if we can reverse this trend and achieve simultaneous power generation and CO(2)valorization. Herein, we demonstrate the first aqueous Al-CO(2)batteries using nanostructured Bi(2)S(3)as the cathode electrocatalyst for selectively converting CO(2)to formate during discharge. Bi(2)S(3)nanoplatelets are preparedviaa facile solvothermal reaction. When measured in a flow cell configuration, they enable CO(2)reduction to formate with an excellent activity (current density up to >400 mA cm(-2)) and selectivity (similar to 100%). Aqueous Al-CO(2)batteries are assembled by pairing the Bi(2)S(3)cathode and the Al anode. They exhibit an impressive power output as well as great formate production rate and selectivity at the cathode. Moreover, we demonstrate that it is possible to use scrap Al from used Al beverage cans for Al-CO(2)batteries to further lower the production cost.