4.7 Article

Multi-metal interaction boosts reconstructed FeCoCrCuOx@CF toward efficient alkaline water electrolysis under large current density

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 476, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.146710

Keywords

Surface reconstruction; Intermetallic interaction; HER; Overall water splitting; Industrial application

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In this study, a series of multi-metal oxide catalysts were designed and prepared on cobalt foams through simple thermal decomposition and electrochemical activation, achieving high efficiency, low cost, and long-term stability. Among them, FeCoCrCuOx@CF showed remarkable catalytic activity and long-term stability for hydrogen evolution reaction (HER). The findings provide new strategies for the design of efficient and stable catalysts for industrial water electrolysis.
Electrolysis of water is one of most promising technologies for green hydrogen production. However, the green hydrogen has a market of 4 % only, as the key-component for the technology, electrocatalyst, is expensive, inefficient or unstable. Herein, we design a series of multi-metal oxides (FeCoOx@CF, FeCoCrOx@CF, FeCoCuOx@CF, and FeCoCrCuOx@CF) on cobalt foams to achieve the high efficiency, low cost, and long-term stability by a simple thermal decomposition and electrochemical activation. Among them, FeCoCrCuOx@CF shows remarkable catalytic activity with an ultra-low overpotential (40 mV at 10 mA cm(-2)) and Tafel slope (27.3 mV dec(-1)) for hydrogen evolution reaction (HER), which is superior to most reported transition-metal catalysts and comparable to commercial Pt/C, because of the synergistic effect of multiple metals and strong Cr-OH interaction on the reconstructed surface as induced by the dynamic dissolution and redeposition process in the reaction. In addition, the catalyst shows excellent long-term stabilities for HER and overall water splitting at 500 mA cm(-2). Importantly, FeCoCrCuOx@CF has the excellent activity and high stability (100 h with only 2 % increment in applied voltage) in the industrial working environment (6 M KOH, similar to 60 degrees C). Most importantly, only 3.18 V is needed to obtain > 30 A on a large size electrode for AWE (16.5 cm(2), similar to 1.84 A cm(-2)) in the industrial conditions. Our findings should provide novel strategies for the design of efficient and stable catalysts toward industrial water electrolysis.

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