Composition Optimization of NiCo LDH/TiO2 for Boosted Electrocatalytic Hydrogen Evolution

IF 2.5 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2026-10-20 DOI:10.1007/s10562-026-05552-9

Fen Qiao, Zuteng Ren, Jiani Liu

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Abstract

Layered double hydroxides (LDHs) offer tunable structures and abundant active sites but suffer from poor conductivity. Here, we construct NiCo LDH/TiO₂ composite catalysts on nickel foam via a hydrothermal method and systematically vary the Ni/Co ratio to optimize the bimetallic composition for enhanced hydrogen evolution reaction (HER) performance. Structural characterization confirms the presence of TiO₂ and the characteristic chemical states of NiCo LDH. Among the compositions investigated, a Ni/Co ratio of 2:1 produces uniformly distributed nanosheets with an open porous architecture and close contact between NiCo LDH and TiO₂. The corresponding catalyst exhibits the lowest charge-transfer resistance and the highest double-layer capacitance of 3.87 mF·cm⁻² among the tested samples, consistent with facilitated charge transfer and increased active-site exposure. The optimized catalyst achieves an overpotential of 86.8 mV at 10 mA·cm⁻² in 1 M KOH, with a Tafel slope of 61 mV·dec⁻¹. Its operational stability was assessed by chronoamperometry at a constant potential for 10 h. These results link Ni/Co composition optimization to favorable morphology and electrochemical properties, providing a basis for the compositional design of LDH-based composite catalysts for alkaline HER.

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NiCo LDH/TiO2加速电催化析氢的组成优化

层状双氢氧化物（LDHs）具有可调的结构和丰富的活性位点，但导电性差。本研究通过水热法在泡沫镍上构建NiCo LDH/TiO2复合催化剂，并系统地改变Ni/Co比，优化双金属成分以增强析氢反应（HER）性能。结构表征证实了TiO2的存在和NiCo LDH的特征化学状态。在所研究的组合物中，Ni/Co比为2:1的组合物产生了均匀分布的纳米片，具有开放多孔结构，NiCo LDH和TiO2之间紧密接触。该催化剂具有最低的电荷转移电阻和最高的双层电容，为3.87 mF·cm−2，与电荷转移促进和活性位点暴露增加相一致。优化后的催化剂在1 M KOH条件下，在10 mA·cm−2下的过电位为86.8 mV， Tafel斜率为61 mV·dec−1。在恒电位下，通过计时电流法评价了其运行稳定性。这些结果将Ni/Co组成优化与良好的形貌和电化学性能联系起来，为ldh基碱性HER复合催化剂的组成设计提供了基础。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.