Freestanding lamellar nanoporous Ni–Co–Mn alloy: a highly active and stable 3D bifunctional electrode for high-current–density water splitting

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-08-09 DOI:10.1007/s12598-024-02882-8

Shao-Fei Zhang, Lu-Yi Shi, Jin Wang, Yue Deng, Zhi-Yuan Shen, Hao Liu, Jin-Feng Sun, Tian-Tian Li, Zhi-Jia Zhang, Jian-Li Kang

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Abstract

Retaining satisfactory electrocatalytic performance under high current density plays a crucial role in industrial water splitting but is still limited to the enormous energy loss because of insufficient exposure of active sites caused by the blocked mass/charge transportation at this condition. Herein, we present a freestanding lamellar nanoporous Ni–Co–Mn alloy electrode (Lnp-NCM) designed by a refined variant of the “dealloying-coarsening-dealloying” protocol for highly efficient bifunctional electrocatalyst, where large porous channels distribute on the surface and small porous channels at the interlayer. With its 3D lamellar architecture regulating, the electrocatalytic properties of the electrodes with different distances between lamellas are compared, and faster energy conversion kinetics is achieved with efficient bubble transport channels and abundant electroactive sites. Note that the optimized sample (Lnp-NCM4) is expected to be a potential bifunctional electrocatalyst with low overpotentials of 258 and 439 mV at high current densities of 1000 and 900 mA·cm⁻² for hydrogen and oxygen evolution reactions (HER and OER), respectively. During overall water splitting in a two-electrode cell with Lnp-NCM4 as cathode and anode, it only needs an ultralow cell voltage of 1.75 V to produce 100 mA·cm⁻² with remarkable long-term stability over 50 h. This study on lamellar nanoporous electrode design approaches industrial water splitting requirements and paves a way for developing other catalytic systems.

Graphical Abstract

Abstract Image

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独立片状纳米多孔镍钴锰合金：用于高电流密度水分离的高活性、高稳定性三维双功能电极

在高电流密度下保持满意的电催化性能在工业水分解中起着至关重要的作用，但在这种情况下，由于质量/电荷传输受阻，活性位点暴露不足，造成了巨大的能量损失。在此，我们提出了一种独立的层状纳米多孔Ni-Co-Mn合金电极（Lnp-NCM），该电极采用了“脱合金-粗化-脱合金”方案的改进版本，用于高效的双功能电催化剂，其中大孔通道分布在表面，小孔通道分布在层间。通过对其三维片层结构的调节，比较了不同片层间距电极的电催化性能，并通过高效的气泡传输通道和丰富的电活性位点实现了更快的能量转化动力学。值得注意的是，优化后的样品（Lnp-NCM4）有望成为一种潜在的双功能电催化剂，在1000和900 mA·cm−2的高电流密度下，其过电位分别为258和439 mV，用于氢和氧的析出反应（HER和OER）。在以Lnp-NCM4为阴极和阳极的双电极电池中，只需要1.75 V的超低电池电压就可以产生100 mA·cm - 2，并且在50 h内具有良好的长期稳定性。本研究的层状纳米孔电极设计接近工业水分解要求，并为开发其他催化系统铺平了道路。图形抽象

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来源期刊

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.