The slow kinetics of the oxygen evolution reaction (OER) has seriously hindered the development of electrical water splitting and rechargeable metal–air batteries. The ethanol oxidation reaction (EOR) to replace the OER is a promising strategy to solve this problem. Herein, we report the synthesis of Co(OH)₂@Ni(OH)₂ heterostructures using a metal-organic framework precursor in a one-pot hydrothermal method. The catalyst showed great EOR catalytic activity (j₁₀ = 1.30 V) and high stability (over 100 h @ 50 mA cm⁻²). The catalytic reaction converts ethanol into acetate through 4e⁻ oxidation with 97.9% faradaic efficiency. The high performance was ascribed to the double hydroxide heterostructure further processed by the electrochemical activation. In situ Raman spectra and DFT calculations identified Ni (NiOOH) as the key active sites for the EOR. Hybrid water electrolysis and zinc–ethanol–air batteries were designed based on the innovative idea of the EOR replacing the OER. The advantages of this design were proved by the 200 mV reduction in the total potential of water splitting and 300 mV reduction in the battery charging voltage, at the same time realizing the direct utilization of biomass energy.

中文翻译：

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Co(OH)2@Ni(OH)2异质结构的原位电化学活化用于高效乙醇电氧化重整和创新的锌-乙醇-空气电池

析氧反应（OER）的缓慢动力学严重阻碍了电水分解和可充电金属-空气电池的发展。乙醇氧化反应 (EOR) 替代 OER 是解决这一问题的有前景的策略。在此，我们报道了在单锅水热法中使用金属有机骨架前体合成 Co(OH) ₂ @Ni(OH) _{2异质结构。}该催化剂表现出良好的 EOR 催化活性（j ₁₀ = 1.30 V）和高稳定性（超过 100 h @ 50 mA cm ^-2）。催化反应通过 4e 将乙醇转化为乙酸盐^-氧化，法拉第效率为 97.9%。高性能归因于通过电化学活化进一步处理的双氢氧化物异质结构。原位拉曼光谱和 DFT 计算确定 Ni (NiOOH) 是 EOR 的关键活性位点。混合水电解和锌-乙醇-空气电池的设计基于 EOR 取代 OER 的创新理念。该设计的优势体现在水分解总电位降低200 mV，电池充电电压降低300 mV，同时实现了生物质能的直接利用。