• Operating the stacked photoanode at the thickness of exciton diffusion length enhances the efficiency of photoelectrochemical water splitting

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    • Keywords


      Photoelectrochemical water splitting; Photoelectrode thickness; Cadmium selenide; Stack; Exciton diffusion length; Optical absorption.

    • Abstract


      In photoelectrochemical water splitting, every impinging photon should not only be absorbed butalso be utilized towards reaction. While increasing photoelectrode thickness in photoelectrochemical reactorsfacilitates photon absorption, it has a debilitating effect on efficiency if the thickness required for completephoton absorption is much more than the exciton diffusion length, which is a property determined by thematerial and its processing. To address this issue, we demonstrate a general experimental methodology with astack of cadmium selenide photoanodes wherein the thickness of each photoelectrode is of the order ofexciton diffusion length and which improves overall photocurrent by about 50%.

    • Graphical Abstract


      Stacked-photo anodes for photoelectrochemical water splitting reaction with each anode having thickness ~ exciton diffusion length. The fraction of light transmitted from the previous anode oxidizes water into O2 and H+. The sum of the thickness of photoanodes is sufficient to absorb all incident light.

    • Author Affiliations



      1. Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
      2. Material Science Programme, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
    • Dates

  • Journal of Chemical Sciences | News

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