Promoting Oxygen Evolution Reaction Induced By Synergetic Geometric and Electronic Effects of Irco Thin-Film Electrocatalysts Article Swipe
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· 2022
· Open Access
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· DOI: https://doi.org/10.1149/ma2022-02502572mtgabs
· OA: W4309836842
The advancement of water electrolysis technology has seemingly plateaued. Further advances require new strategies to address the key limitations of the oxygen evolution reaction: high overpotential and low stability of electrode materials. Herein, we designed a nanoporous Ir 3 Co-core@IrO 2 -shell electrocatalyst with 5 and 3 times higher mass activity and 6 and 2 times higher activity−stability factors than conventional IrO 2 nanoparticles and Ir nanoporous electrocatalysts, respectively. The origin of the performance enhancement in the Ir 3 Co-core@IrO 2 -shell electrocatalyst was revealed in computational density functional theory calculations. The residual Co after the dealloying process resulted in a down-shift of the d -band center position, thus weakening the −OH* adsorption energy. In addition, the electronic conductivity was enhanced by the three-dimensionally interconnected structure. Under high-current-density operating conditions, the Ohmic losses were reduced by the ultrafast charge transfer pathway provided by the metallic IrCo core.
