The exploitation of low-cost, efficient and stable electrocatalysts for overall water splitting in alkaline media is critical for future renewable energy systems, yet still remains a great challenge. Herein, we report the in situ growth of porous NiCoSe nanosheet arrays derived from 2D MOFs on Ni foam through a simple ion-exchange reaction followed by a hydrothermal process. Benefiting from the unique 2D multi-porous framework with high electrochemical active surface area, conductivity and open channels for the release of gaseous products, the as-prepared NiCoSe nanosheet arrays exhibit excellent electrochemical activity with a low overpotential of 170 mV for the hydrogen evolution reaction (HER) at 10 mA cm⁻² and 278 mV for the oxygen evolution reaction (OER) at 20 mA cm⁻² and long-term stability. Furthermore, the full cell only requires 1.51 V to drive the current density of 10 mA cm⁻² when the NiCoSe nanosheet arrays are used as both anode and cathode, which also exhibits distinguished durability for over 48 h. The present work presents a general strategy for the rational design and synthesis of multifunctional 2D porous electrocatalysts, which is also expected to extend to other noble-metal-free catalysts.

中文翻译：

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Ni泡沫上的二维MOF衍生的多孔NiCoSe纳米片阵列，用于整体水分解

在碱性介质中利用低成本，高效和稳定的电催化剂进行总水分解对于未来的可再生能源系统至关重要，但仍然是巨大的挑战。在这里，我们报告了通过简单的离子交换反应，然后进行水热过程，在二维泡沫上在镍泡沫上原位生长了多孔二维的NiCoSe纳米片阵列。得益于独特的二维多孔结构，具有高的电化学活性表面积，电导率和用于释放气态产物的开放通道，所制备的NiCoSe纳米片阵列表现出出色的电化学活性，且对于氢气析出反应的过电位低至170 mV （HER）在10 mA cm ^-2和278 mV下用于20 mA cm的氧气析出反应（OER）^-2和长期稳定性。此外，当将NiCoSe纳米片阵列同时用作阳极和阴极时，整个电池仅需要1.51 V的电压即可驱动10 mA cm ^-2的电流密度，这也显示了超过48小时的出色耐久性。本工作提出了合理设计和合成多功能2D多孔电催化剂的一般策略，也有望将其扩展到其他无贵金属的催化剂。