Iron-based materials have been extensively studied and applied as electrocatalysts. However, the electronic structure of iron itself is not conducive to effectively activating adsorbed intermediates, leading to slower kinetic steps. In this study, a heterogeneous composite catalyst with a nano-sheet array structure consisting of iron boron/sulfide (FeS@Fe2B/IP) was successfully prepared through a two-step process involving boriding and sulfidation of iron plates. The nanosheet array structure provides numerous catalytic active sites, promotes effective contact between electrolytes and catalytic sites, and enhances the apparent reaction rate of the catalyst. Additionally, the heterogeneous interface of FeS/Fe2B plays a crucial role in regulating the electronic structure of the metal Fe site, improving charge transfer rates, and accelerating electrocatalytic reaction kinetics. Ultimately, FeS@Fe2B/IP demonstrates outstanding water splitting performance, with only 177 and 191 mV overpotential providing 10 mA cm−2 toward HER and OER, respectively. Furthermore, it achieves a high current density of 500 mA cm−2 at 473 and 520 mV overpotentials for HER and OER, respectively. In addition to its excellent performance in water splitting applications, a bipolar alkaline cell was constructed using the FeS@Fe2B/IP bifunctional catalyst. This achieved current densities of 10 and 100 mA cm−2 at potentials of 1.63 and 1.75 V. Moreover, the catalytic stability of the FeS@Fe2B/IP system remained consistent for nearly 50 hours at current densities of 10 and 100 mA cm−2. These results confirm that FeS@Fe2B/IP is indeed a high-performance bifunctional electrocatalytic material which can significantly improve energy utilization efficiency in various applications.

中文翻译：

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用于构建用于高效整体水分解的硫化铁/硼化物纳米片异质结构双功能电催化剂的界面工程


铁基材料作为电催化剂已被广泛研究和应用。然而，铁本身的电子结构不利于有效激活吸附的中间体，导致动​​力学步骤较慢。本研究通过铁板硼化和硫化两步法成功制备了由铁硼/硫化物组成的纳米片阵列结构的非均相复合催化剂（FeS@Fe2B/IP）。纳米片阵列结构提供了众多的催化活性位点，促进了电解质与催化位点之间的有效接触，提高了催化剂的表观反应速率。此外，FeS/Fe2B的异质界面在调节金属Fe位点的电子结构、提高电荷转移速率和加速电催化反应动力学方面起着至关重要的作用。最终，FeS@Fe2B/IP 表现出出色的水分解性能，仅 177 和 191 mV 的过电势分别为 HER 和 OER 提供 10 mA cm−2 。此外，它在 HER 和 OER 过电势分别为 473 和 520 mV 时实现了 500 mA cm−2 的高电流密度。除了在水分解应用中具有优异的性能外，还使用 ​​FeS@Fe2B/IP 双功能催化剂构建了双极碱性电池。这在 1.63 和 1.75 V 的电位下实现了 10 和 100 mA cm−2 的电流密度。此外，FeS@Fe2B/IP 系统的催化稳定性在 10 和 100 mA cm−2 的电流密度下在近 50 小时内保持一致。 。这些结果证实FeS@Fe2B/IP确实是一种高性能双功能电催化材料，可以显着提高各种应用中的能源利用效率。