Jiangcheng Zhang, Qiuhan Cao, Xin Yu, Hu Yao, Baolian Su, Xiaohui Guo
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引用次数: 0
Abstract
Currently, NiFe-LDH exhibits an excellent oxygen evolution reaction (OER) due to the interaction of the two metal elements on the layered double hydroxide (LDH) platform. However, such interaction is still insufficient to compensate for its poor electrical conductivity, limited number of active sites and sluggish dynamics. Herein, a feasible two-step hydrothermal strategy that involves coupling low-conductivity NiFe-LDH with 3D porous graphene aerogel (GA) is proposed. The optimized NiFe-LDH/GA (1:1) produced possesses a 257 mV (10 mA cm-2) overpotential and could operate stably for 56 h in an OER. Our investigation demonstrates that the NiFe-LDH/GA has a three-dimensional mesoporous structure, and that there is synergistic interaction between LDH and GA and interfacial reconstruction of NiOOH. Such an interface synergistic coupling effect promotes fast mass transfer and facilitates OER kinetics, and this work offers new insights into designing efficient and stable GA-based electrocatalysts.
目前，由于层状双氢氧化物（LDH）平台上两种金属元素的相互作用，NiFe-LDH 表现出卓越的氧进化反应（OER）。然而，这种相互作用仍不足以弥补其导电性差、活性位点数量有限和动力学迟缓的缺陷。在此，我们提出了一种可行的两步水热策略，将低导电性的镍铁合金-层状双氢氧化物与三维多孔石墨烯气凝胶（GA）耦合在一起。优化后的 NiFe-LDH/GA（1:1）具有 257 mV（10 mA cm-2）的过电位，可在 OER 中稳定运行 56 小时。我们的研究表明，NiFe-LDH/GA 具有三维介孔结构，LDH 与 GA 之间存在协同作用，NiOOH 存在界面重构。这种界面协同耦合效应促进了快速传质，有利于 OER 动力学的发展，这项工作为设计高效、稳定的 GA 型电催化剂提供了新的思路。
期刊介绍：
Nanomaterials (ISSN 2076-4991) is an international and interdisciplinary scholarly open access journal. It publishes reviews, regular research papers, communications, and short notes that are relevant to any field of study that involves nanomaterials, with respect to their science and application. Thus, theoretical and experimental articles will be accepted, along with articles that deal with the synthesis and use of nanomaterials. Articles that synthesize information from multiple fields, and which place discoveries within a broader context, will be preferred. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental or methodical details, or both, must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Nanomaterials is dedicated to a high scientific standard. All manuscripts undergo a rigorous reviewing process and decisions are based on the recommendations of independent reviewers.
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