The controllable synthesis of single‐crystallized iron‐cobalt carbonate hydroxide nanosheets array on 3D conductive Ni foam (FCCH/NF) as a monolithic oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) bifunctional electrocatalyst for full water splitting is described. The results demonstrate that the incorporation of Fe can effectively tune the morphology, composition, electronic structure, and electrochemical active surface area of the electrocatalysts, thus greatly enhancing the intrinsic electrocatalytic activity. The optimal electrocatalyst (F_0.25C₁CH/NF) can deliver 10 and 1000 mA cm⁻² at very small overpotentials of 77 and 256 mV for HER and 228 and 308 mV for OER in 1.0 m KOH without significant interference from gas evolution. The F_0.25C₁CH‐based two‐electrode alkaline water electrolyzer only requires cell voltages of 1.45 and 1.52 V to achieve current densities of 10 and 500 mA cm⁻². The results demonstrate that such fascinating electrocatalytic activity can be ascribed to the increase in the catalytic active surface area, facilitated electron and mass transport properties, and the synergistic interactions because of the incorporation of Fe.

中文翻译：

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多功能单结晶碳酸氢盐作为高效的全水分解电催化剂

描述了在3D导电镍泡沫（FCCH / NF）上可控合成的单晶碳酸铁钴氢氧化物纳米片阵列，作为整体式水分解的整体式氧气释放反应（OER）和氢气释放反应（HER）双功能电催化剂。结果表明，Fe的掺入可以有效地调节电催化剂的形态，组成，电子结构和电化学活性表面积，从而大大提高了固有的电催化活性。最佳的电催化剂（F _0.25 C ₁ CH / NF）可以在1.0 m的极低电势下（对于HER为77和256 mV，对于OER为228和308 mV ）提供10和1000 mA cm ^-2的超小电势。KOH不受气体放出的明显干扰。基于F _0.25 C ₁ CH的两电极碱性水电解槽仅需要1.45和1.52 V的电池电压即可达到10和500 mA cm ^-2的电流密度。结果表明，这种令人着迷的电催化活性可以归因于催化活性表面积的增加，促进的电子和质量传输性质以及由于掺入Fe而产生的协同相互作用。