Electronic modulation and dual-defect construction of NiMoP/Ni2P heterointerfaces for sustainable oxygen evolution reaction

IF 9.6 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Qing-Qing Zhang, Yan-Na Xu, De-Rong Duan, Heng-Jun Su, Tao Wang, Xiao-Jun Zeng
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引用次数: 0

Abstract

The existence of multiple vacancies leads to significant changes in the local atomic structure, which can regulate the electronic structure of the surface and form unsaturated coordination geometries. However, the current methods employed to generate multiple vacancies in two-dimensional (2D) layered double hydroxide (LDH) materials are still difficult to achieve to some extent and are primarily limited to monolayer LDH structures. Here, we present an improved method to synthesize NiMoP/Ni2P catalysts with a sponge-like porous structure. Firstly, NiO with dual defects was constructed by subjecting NiMo-LDH/Ni to air calcination. Subsequently, we performed phosphorization treatment and introduced multiple Ni vacancies and O vacancies as defect sites to tune the edge and substrate surfaces of LDH. At the same time, the electronic structure was tuned by adding P heteroatoms. The synergistic effect of porous structure, heterogeneous interfaces, vacancies, doping defects, and amorphous states can greatly enhance the electron transfer effect inside the catalysts, which significantly improves the catalytic ability of the oxygen evolution reaction (OER). Therefore, the overpotential for the oxygen evolution reaction of NiMoP/Ni2P heterointerfaces reaches 270 mV at a current density of 10 mA·cm−2 under alkaline conditions, with the catalysts capable of sustaining high current densities even after the durability testing for 35 h.

Graphical abstract

Abstract Image

用于可持续氧进化反应的 NiMoP/Ni2P 异质界面的电子调制和双缺陷构建
多重空位的存在会导致局部原子结构发生显著变化,从而调节表面的电子结构并形成不饱和配位几何。然而,目前在二维(2D)层状双氢氧化物(LDH)材料中产生多个空位的方法在一定程度上仍然难以实现,而且主要局限于单层 LDH 结构。在此,我们提出了一种合成具有海绵状多孔结构的 NiMoP/Ni2P 催化剂的改进方法。首先,通过对 NiMo-LDH/Ni 进行空气煅烧,制备出具有双重缺陷的 NiO。随后,我们进行了磷化处理,并引入了多个镍空位和 O 空位作为缺陷位点,以调整 LDH 的边缘和基底表面。同时,通过添加 P 杂原子来调整电子结构。多孔结构、异质界面、空位、掺杂缺陷和无定形态的协同作用可大大增强催化剂内部的电子传递效应,从而显著提高氧进化反应(OER)的催化能力。因此,在碱性条件下,当电流密度为 10 mA-cm-2 时,NiMoP/Ni2P 异质界面氧进化反应的过电位达到 270 mV,即使经过 35 h 的耐久性测试,催化剂仍能维持高电流密度。
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来源期刊
Rare Metals
Rare Metals 工程技术-材料科学:综合
CiteScore
12.10
自引率
12.50%
发文量
2919
审稿时长
2.7 months
期刊介绍: Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.
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