Hanxiao Liao, Kejun Chen, Xiaorong He, Jiaxin Tong, Xuanzhi Liu, Pengfei Tan, Xueyi Guo* and Jun Pan*,
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引用次数: 0
摘要
NiFe层状双氢氧化物（NiFe LDH）衍生的氢氧化物是很有前途的碱性析氧反应（OER）电催化剂。然而，具有稳定金属-氧-金属（M-O-M）结构的NiFe LDH受到NiFe相互作用不足的影响，导致不良的活性和稳定性。本文采用有机连接剂对NiFe LDH进行改性，制备了NiFe氢氧化物-有机骨架（NiFe HOF），打破了M-O-M的结构限制，从而提高了OER。具有可重构金属位的NiFe HOF有利于OER条件下的结构再造，形成丰富的NiFe相互作用和延长的M-O键，激发晶格氧机制。因此，NiFe HOF在50 mA cm-2时的过电位明显降低，比NiFe LDH低68 mV。以NiFe HOF为阳极电极的阴离子交换膜电解槽在1 A cm-2下表现出超过1050 h的超长稳定性，衰减低至0.16 mV h - 1。
Metal Hydroxide–Organic Framework Mediated Structural Reengineering Enables Efficient NiFe Interaction for Robust Water Oxidation
NiFe layered double hydroxide (NiFe LDH) derived oxyhydroxides are promising electrocatalysts for the alkaline oxygen evolution reaction (OER). However, NiFe LDH with a stable metal–oxygen–metal (M–O–M) structure suffers from inadequate NiFe interaction, leading to undesirable activity and stability. Herein, we develop a NiFe hydroxide–organic framework (NiFe HOF) via modification of NiFe LDH with an organic linker to break the structural constraint of M–O–M and thus boost the OER. NiFe HOF with reconfigurable metal sites facilitates structural reengineering under the OER condition to form abundant NiFe interaction and prolonged M–O bonds, stimulating lattice oxygen mechanism. Therefore, NiFe HOF shows a distinctly decreased overpotential at 50 mA cm–2, which is 68 mV lower than that of NiFe LDH. The anion exchange membrane electrolyzer using NiFe HOF as anode electrode displays ultralong stability exceeding 1050 h at 1 A cm–2 with a low attenuation of 0.16 mV h–1.
期刊介绍：
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
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Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.
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