Abstract Fabricating highly efficient and low-cost non-precious metal-based catalysts is a prerequisite for large-scale electrochemical water splitting in future renewable energy systems, yet remains a challenge. Herein, we describe the synthesis of cobalt-nickel oxide nanowires decorated with molybdenum disulfide nanosheets, directly grown on Ni foam (MoS2/NiCo2O4/NF), by a simple stepwise hydrothermal method and calcination process. Benefiting from a synergistic effect between MoS2 and NiCo2O4, the heterostructured catalyst accelerates water dissociation and exhibits superior catalytic activity under alkaline conditions, with a current density of 50 mA cm−2 at a low overpotential of 322 mV for the oxygen evolution reaction (OER) and an overpotential of 106 mV for the hydrogen evolution reaction (HER) (@ j = 10 mA cm−2). Notably, when used as both anode and cathode for overall water splitting, MoS2/NiCo2O4/NF achieved a quite low voltage of 1.62 V at 10 mA cm−2, and exhibited satisfactory stability for 16 h. Moreover, we have achieved continuous hydrogen and oxygen evolution at 1.606 V generated by using a solar panel, which is a promising route for solar-to-hydrogen conversion.

中文翻译：

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一种负载在泡沫镍上的 MoS2/NiCo2O4 复合材料作为双功能电催化剂实现高效的整体水分解

摘要 制备高效、低成本的非贵金属基催化剂是未来可再生能源系统中大规模电化学水分解的先决条件，但仍然是一个挑战。在此，我们描述了通过简单的逐步水热法和煅烧工艺，直接在泡沫镍 (MoS2/NiCo2O4/NF) 上生长的用二硫化钼纳米片装饰的钴镍氧化物纳米线的合成。受益于 MoS2 和 NiCo2O4 之间的协同作用，异质结构催化剂加速水离解并在碱性条件下表现出优异的催化活性，电流密度为 50 mA cm-2，氧析出反应 (OER) 的低过电位为 322 mV析氢反应 (HER) (@ j = 10 mA cm−2) 的过电位为 106 mV。尤其，当用作阳极和阴极进行整体水分解时，MoS2/NiCo2O4/NF 在 10 mA cm-2 下实现了 1.62 V 的相当低的电压，并在 16 小时内表现出令人满意的稳定性。此外，我们通过使用太阳能电池板在 1.606 V 电压下实现了连续的氢和氧析出，这是太阳能到氢转换的一条有前途的途径。