Developing effective, stable, and economical electrocatalysts to achieve highly efficient overall water splitting under a large current density in industries is critical for renewable H₂ production. Here, benefiting from one-step preoxidation that makes Co foam to act not only as a conductive collector but also as the sole cobalt source, a seamless integrated electrode (Fe₂P-Co₂P/CF) is successfully synthesized in which Co₂P, Fe₂P, and Co foam are tightly connected by chemical bonds to construct a versatile, highly active, and a durable catalyst for water splitting in an alkaline medium. Such an electrode only requires 145, 208, and 254 mV for hydrogen evolution reaction (HER), while it requires 243, 291, and 317 mV for oxygen evolution reaction (OER) to deliver current densities of 100, 500, and 1000 mA cm^–2, respectively. Notably, using Fe₂P-Co₂P/CF as both an anode and a cathode at room (25 °C) and quasi-industrial (65 °C) temperatures, the operating voltages are as low as 1.87 and 1.71 V to reach 500 mA cm^–2, respectively, together with excellent long-term durability over 300 h. The prominent performance is due to the robust in situ growth together with the formation of a strongly coupled heterojunction between Fe₂P and Co₂P, making it one of the most potential candidates to meet the large-scale application of industrial water electrolysis.

中文翻译：

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工业电解温度下大电流密度下原位生长的钴铁磷酸盐基集成电极用于长期水分解

在工业中以大电流密度开发有效，稳定和经济的电催化剂以实现高效的总水分解对于可再生H ₂生产至关重要。在此，得益于使Co泡沫不仅充当导电集电体而且充当唯一钴源的一步预氧化，成功地合成了其中Co ₂的无缝集成电极（Fe ₂ P-Co ₂ P / CF）磷₂P和Co泡沫通过化学键紧密连接，构成一种多功能，高活性和耐用的催化剂，用于在碱性介质中进行水分解。这样的电极仅需要145、208和254 mV的氢析出反应（HER），而它需要243、291和317 mV的氧析出反应（OER）才能提供100、500和1000 mA cm的电流密度^–2分别。值得注意的是，在室温（25°C）和准工业温度（65°C）下，使用Fe ₂ P-Co ₂ P / CF作为阳极和阴极，其工作电压可低至1.87和1.71 V 500 mA厘米^–2分别具有超过300小时的出色长期耐用性。杰出的性能是由于强劲的原位生长以及在Fe ₂ P和Co ₂ P之间形成强耦合异质结而使其成为满足工业水电解大规模应用的最有潜力的候选者之一。