ScholarWorks@Y-Scholar Hub

초록

<jats:title>Abstract</jats:title><jats:p>To realize practical solar hydrogen production, a low‐cost photocathode with high photocurrent density and onset potential should be developed. Herein, an efficient and stable overall photoelectrochemical tandem cell is developed with a Cu<jats:sub>3</jats:sub>BiS<jats:sub>3</jats:sub>‐based photocathode. By exploiting the crystallographic similarities between Bi<jats:sub>2</jats:sub>S<jats:sub>3</jats:sub> and Cu<jats:sub>3</jats:sub>BiS<jats:sub>3</jats:sub>, a one‐step solution process with two sulfur sources is used to prepare the Bi<jats:sub>2</jats:sub>S<jats:sub>3</jats:sub>–Cu<jats:sub>3</jats:sub>BiS<jats:sub>3</jats:sub> blended interlayer. The elongated Bi<jats:sub>2</jats:sub>S<jats:sub>3</jats:sub>‐Cu<jats:sub>3</jats:sub>BiS<jats:sub>3</jats:sub> mixed‐phase 1D nanorods atop a planar Cu<jats:sub>3</jats:sub>BiS<jats:sub>3</jats:sub> film enable a high photocurrent density of 7.8 mA cm<jats:sup>−2</jats:sup> at 0 V versus the reversible hydrogen electrode, with an onset potential of 0.9 V<jats:sub>RHE</jats:sub>. The increased performance over the single‐phase Cu<jats:sub>3</jats:sub>BiS<jats:sub>3</jats:sub> thin‐film photocathode is attributed to the enhanced light scattering and charge collection through the unique 1D nanostructure, improved electrical conductivity, and better band alignment with the n‐type CdS layer. A solar‐to‐hydrogen efficiency of 2.33% is achieved under unassisted conditions with a state‐of‐the‐art Mo:BiVO<jats:sub>4</jats:sub> photoanode, with excellent stability exceeding 21 h.</jats:p>