Rationally Designed Asymmetric Pt─O─Cu Ligand to Stabilize Active Sites Towards Superior Industrial-Standard Alkaline
Minming Jiang1, Jiang Xu1, Qi Zhou1
1College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
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Developing efficient and durable Pt-based catalysts via interface engineering remains a critical yet challenging task for water electrolysis under high-pH conditions. Herein, we design a unique asymmetric Pt─O─Cu ligand at the PtCu2(111)/CuO(002) heterojunction interface to promote alkaline HER kinetics. This ligand balances the adsorption and desorption of H* on the Pt site by accelerating electron transfer at the interface while enhancing the adsorption of H2O on the Cu site. Moreover, the strong d-d/sp hybridization and more delocalized d-DOS located at the Pt─O─Cu ligand enhance the interatomic interactions, which helps alleviate the dissolution and agglomeration of Pt and Cu atoms. As anticipated, the PtCu2/CuO requires ultra-low overpotentials of 10, 14 and 47 mV in, respectively, alkaline, acidic and neutral electrolytes to achieve a current density of 10 mA cm-2. Even more surprising is that the PtCu2/CuO||RuO2 dual-electrode hydrolysis cell can stably operate at a high current density of 1 A cm-2 for more than 500 h in a simulated industrial environment, demonstrating significant potential for industrial applications. This work provides a new paradigm for the design of industrially relevant high-performance Pt-based alkaline hydrogen evolution catalytic materials.
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