Wei Hua, Yueying Li, Huanhuan Sun* and Jian-Gan Wang*,
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引用次数: 0
摘要
NiFe层状双氢氧化物(LDH)是碱性析氧反应(OER)的基准电催化剂,但如何以一种简单易行的方法开发出具有更高的内在催化活性和丰富的活性位点的NiFe LDH催化剂仍然是一个巨大的挑战。本研究采用协同重构的方法制备了具有三维(3D)层次结构的富缺陷NiFe层状双氢氧化物(d-NiFe LDH)。通过钼酸盐和植酸配体的原位协同重建,实现了在一维纳米棒上快速生成d-NiFe LDH二维纳米片。d-NiFe LDH显示出更高的内在催化活性,其三维层次结构暴露出更多的活性位点。利用这些特性,电极表现出出色的OER催化性能,最小过电位为204和282 mV,电流密度为10和500 mA cm-2。值得注意的是,该电极在500 mA cm-2下保持350小时以上的优异稳定性。当在双电极系统中与NiMoN电极耦合时,分别需要1.47和1.73 V的低压来实现10和500 mA cm-2。这项工作为开发缺陷和3D结构以构建超越OER的各种催化群落的先进电催化剂铺平了新的大门。
Synergistic Reconstruction of Defect-Enriched NiFe-LDH Hierarchical Structures toward Large-Current and Stable Oxygen Evolution Reaction
NiFe layered double hydroxide (LDH) is the benchmark electrocatalyst toward alkaline oxygen evolution reaction (OER), however, it remains a grand challenge to develop NiFe LDH catalysts with higher intrinsic catalytic activity and abundant active sites by a simple and facile method. In this study, a synergistic reconstruction approach is introduced to fabricate defect-enriched NiFe layered double hydroxide (d-NiFe LDH) with three-dimensional (3D) hierarchical structures. Through in situ synergistic reconstruction of molybdates and phytic acid ligands, rapid generation of d-NiFe LDH two-dimensional nanosheets on one-dimensional nanorods is achieved. The d-NiFe LDH displays elevated intrinsic catalytic activity, with the 3D hierarchical structures exposing a greater number of active sites. Leveraging these characteristics, the electrode demonstrates outstanding OER catalytic performance with minimal overpotentials of 204 and 282 mV to reach current densities of 10 and 500 mA cm–2. Notably, this electrode maintains excellent stability for over 350 h at 500 mA cm–2. When coupled with a NiMoN electrode in a two-electrode system, low voltages of 1.47 and 1.73 V are needed to achieve 10 and 500 mA cm–2, respectively. The work paves a fresh doorway for developing defects and 3D structures to construct advanced electrocatalysts toward various catalytic communities beyond OER.
期刊介绍:
ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.