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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

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Activating RuOCo Interaction on the a-Co(OH)₂ @Ru Interface for Accelerating the Volmer Step of Alkaline Hydrogen

Jun Zhao¹, Jiajun Wang¹, Xuerong Zheng²

¹Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China.

|January 6, 2023

Abstract:

The state-of-the-art active hydrogen evolution reaction (HER) catalysts in acid electrolytes generally lose considerable catalytic performance in alkaline electrolytes mainly due to the additional water dissociation step. Designing composite materials is an effective strategy to accelerate alkaline water electrolysis by optimizing the electronic structure of materials. Here, different phases of Co(OH)₂ -supported Ru clusters (α/β-Co(OH)₂ @Ru) are prepared for enabling a highly efficient electrocatalytic HER performance in alkaline solution. The prepared α-Co(OH)₂ nanosheets facilitate the loading of uniform and high-density Ru clusters and the formed highly active RuOCo bonds at the interface. The synergistic interaction endows the hybrid catalyst with low overpotential of 33 mV at 10 mA cm^-2 . Moreover, the homemade anion exchange membrane water electrolysis cell based on α-Co(OH)₂ @Ru affords a cell voltage of 2 V to drive a current density of 270 mA cm^-2 and performs stably during continuous operation for over 100 h. Density functional theory calculations demonstrate that active RuOCo bonds in α-Co(OH)₂ @Ru optimize the energy barriers for H₂ O dissociation and OH^- desorption to facilitate the Volmer reaction step. This work offers a strategy for designing interfacial chemical bonds for high electrocatalytic activity.

Keywords:

clusters electronic structures hydrogen evolution phase engineering structure-function relationship

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