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In Situ Reconstruction of Partially Hydroxylated Porous Rh Metallene for Ethylene Glycol-Assisted Seawater Splitting

机译:In Situ Reconstruction of Partially Hydroxylated Porous Rh Metallene for Ethylene Glycol-Assisted Seawater Splitting

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摘要

Designing efficient and durable electrocatalysts for seawater electrolysisshows a great research prospect, but it remains a significant challenge.Herein, we report the partially hydroxylated Rh metallene (Rh/RhOOH metallene)with porous, ultrathin, defect-rich and hetero-phase structure for ethyleneglycol (EG)-assisted seawater electrolysis. In parallel, the unique redoxeffect of RhOOH species and EG as well as the electroreduction effect riggersthe in situ reconstruction for the catalyst during electrocatalysis, which furtherproduces active Rh species to optimize the catalytic activity center andsurface catalytic reaction. Benefiting from the unique metallene structure andthe Rh/RhOOH heterogeneous structure, the Rh/RhOOH metallene exhibitssuperior electrocatalytic performance towards hydrogen evolution reaction(HER, overpotential of 29 mV) and EG oxidation reaction (EGOR, specificactivity of 1.051 mA cm~(–2)). Encouragingly, in the constructed EG-assistedseawater electrolysis system, the Rh/RhOOH metallene only needs a lowcell voltage of 0.678 V to achieve a current density of 10 mA cm~(–2) for energysavingH_2 production, which significantly reduces energy consumption comparedto conventional seawater electrolysis.

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