It is highly desirable to develop high-performance and robust electrocatalysts for overall water splitting, as the existing electrocatalysts exhibit poor catalytic performance toward hydrogen and oxygen evolution reactions (HER and OER) in the same electrolytes, resulting in high cost, low energy conversion efficiency, and complicated operating procedures. Herein, a heterostructured electrocatalyst is realized by growing Co-ZIF-67-derived 2D Co-doped FeOOH on 1D Ir-doped Co(OH)F nanorods, denoted as Co-FeOOH@Ir-Co(OH)F. The Ir-doping couples with the synergy between Co-FeOOH and Ir-Co(OH)F effectively modulate the electronic structures and induce defect-enriched interfaces. This bestows Co-FeOOH@Ir-Co(OH)F with abundant exposed active sites, accelerated reaction kinetics, improved charge transfer abilities, and optimized adsorption energies of reaction intermediates, which ultimately boost the bifunctional catalytic activity. Consequently, Co-FeOOH@Ir-Co(OH)F exhibits low overpotentials of 192/231/251 and 38/83/111 mV at current densities of 10/100/250 mA cm^–2 toward the OER and HER in a 1.0 M KOH electrolyte, respectively. When Co-FeOOH@Ir-Co(OH)F is used for overall water splitting, cell voltages of 1.48/1.60/1.67 V are required at current densities of 10/100/250 mA cm^–2. Furthermore, it possesses outstanding long-term stability for OER, HER, and overall water splitting. Our study provides a promising way to prepare advanced heterostructured bifunctional electrocatalysts for overall alkaline water splitting.

中文翻译：

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用于高效电催化水分解的异质结构超薄二维 Co-FeOOH 纳米片@1D Ir-Co(OH)F 纳米棒

非常需要开发用于整体水分解的高性能和稳健的电催化剂，因为现有的电催化剂在相同电解质中对氢和氧析出反应（HER和OER）表现出较差的催化性能，导致成本高，能量转换效率低，以及复杂的操作程序。在此，通过在一维 Ir 掺杂的 Co( OH )F 纳米棒上生长 Co-ZIF-67 衍生的二维 Co 掺杂 FeOOH 来实现异质结构电催化剂，表示为 Co-FeOOH@Ir-Co( OH )F。Ir 掺杂与 Co-FeOOH 和 Ir-Co( OH )F 之间的协同作用有效地调节电子结构并诱导缺陷富集界面。这赋予 Co-FeOOH@Ir-Co( OH)F具有丰富的暴露活性位点，加速反应动力学，提高电荷转移能力，优化反应中间体的吸附能，最终提高双功能催化活性。因此，Co-FeOOH@Ir-Co( OH )F 在 10/100/250 mA cm ^–2的电流密度下对 OER 和 HER表现出 192/231/251 和 38/83/111 mV 的低过电势。 M KOH 电解质，分别。当 Co-FeOOH@Ir-Co( OH )F 用于全水分解时，在 10/100/250 mA cm ^{–2的电流密度下需要 1.48/1.60/1.67 V 的电池电压}. 此外，它对 OER、HER 和整体水分解具有出色的长期稳定性。我们的研究为制备用于全碱性水分解的先进异质结构双功能电催化剂提供了一种有前途的方法。