The prevailing barrier to produce hydrogen from water splitting is disappointingly sluggish kinetics. Furthermore, a lack of understanding of the key obstacle in the oxygen evolution reaction (OER), is an obstruction to the design of efficient water‐splitting electrocatalysts. Here, we present the single‐step and fast fabrication of ready‐made Ni(OH)₂/nickel foam (NF) electrocatalysts for overall water splitting by using the environmentally friendly and sustainable approach of electric‐field‐assisted pulsed laser ablation in liquid for the generation of nanoparticles (NPs) and the simultaneous electrodeposition of the NPs on the NF substrate. The as‐fabricated electrocatalyst is found to be highly efficient and stable in alkaline medium for hydrogen evolution reaction (HER) and OER kinetics with remarkably low overpotentials of 187 mV (vs. RHE for HER) and 166 mV (vs. RHE for OER) to reach a current density of 20 mA cm⁻², with HER and OER Tafel slopes of 82 and 69 mV dec⁻¹, respectively. The two‐electrode electrochemical cell made of the bifunctional Ni(OH)₂/NF electrocatalyst requires an overpotential as low as 168 mV to drive a 10 mA/cm² current density over a long period. These results reveal the long‐term stability and activity of the Ni(OH)₂)/NF electrocatalyst towards overall water (OW) splitting. The developed sustainable approach of electrocatalyst fabrication can be extended to a range of materials, beyond Ni(OH)₂/NF, to boost a range of chemical reactions, beyond water splitting.

中文翻译：

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电场辅助脉冲激光烧蚀法一步一步，可持续地制备Ni（OH）2 / Ni泡沫水分解催化剂

由水分解产生氢的主要障碍是令人失望的动力学迟滞。此外，对氧释放反应（OER）的关键障碍的认识不足，阻碍了高效水分解电催化剂的设计。在这里，我们介绍现成的Ni（OH）₂的单步快速制造/镍泡沫（NF）电催化剂，通过使用环境友好且可持续的电场辅助脉冲激光烧蚀在液体中产生纳米颗粒（NP）和在NF衬底上同时电沉积的环保和可持续方法，来进行总水分解。在碱性介质中，所制得的电催化剂在氢气释放反应（HER）和OER动力学方面非常高效且稳定，过电势极低，分别为187 mV（相对于HER的RHE）和166 mV（相对于OER的RHE）。达到20 mA cm ^-2的电流密度，HER和OER Tafel斜率分别为82和69 mV dec ^-1。由双功能Ni（OH）₂制成的双电极电化学电池/ NF电催化剂需要低至168 mV的超电势才能长期驱动10 mA / cm ^2的电流密度。这些结果揭示了Ni（OH）₂）/ NF电催化剂对总水（OW）分解的长期稳定性和活性。可以将已开发的可持续的电催化剂制造方法扩展到除Ni（OH）₂ / NF以外的其他材料范围内，以促进除水分解以外的一系列化学反应。