Dynamic response to fluctuating input of Nb:Ti:N film modified Ti bipolar plates for proton exchange membrane water electrolyser

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Science Pub Date : 2025-06-01 Epub Date: 2025-02-18 DOI:10.1016/j.corsci.2025.112803

Xiejing Luo , Luqi Chang , Chenhao Ren , Yingyu Ding , Jiuhong Zhang , Dawei Zhang , Jizheng Yao , Zhanfeng Deng , Chaofang Dong

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Abstract

The potential application of renewable energy sources such as wind power and photovoltaics in hydrogen production from water electrolysis has driven the development of bipolar plates. Combined with theoretical conductivity calculations and electrode potential-pH diagram constructions, a novel Nb:Ti:N film for bipolar plates is innovatively designed with excellent electrical conductivity and corrosion resistance, as well as high thermal and chemical stability. The Nb and N elements improve the electronic delocalisation effect and transport capacity of Ti and TiO₂, and the interfacial contact resistance of the Nb:Ti:N film modified Ti bipolar plates has been decreased to 3.27 mΩ cm² at 1.4 MPa, with an enhancement of electrical conductivity by about 86 %. At 0 < pH < 7, both Ti metal and Nb metal present good stability and the passivation zone is mainly in the form of TiO₂ and Nb₂O₅. At 1.8 V (vs. Ag/AgCl), the corrosion resistance of Nb metal is better and the Nb oxide formed by passivation of Nb metal prevents the dissolution of Ti substrate into TiO²⁺ and (TiO₂)²⁺ ions. Moreover, periodic triangle and square wave polarization potentials have been applied to simulate wind and photovoltaic power input. By evaluating the durability and dynamic response characteristics of the bipolar plates under fluctuating voltage input conditions, it can be concluded that the high potential promotes the passivation behavior of Nb metal in Nb:Ti:N films, which results in a fast response to current fluctuations caused by fluctuating potentials.

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质子交换膜水电解槽用Nb:Ti:N膜修饰Ti双极板波动输入的动态响应

风能和光伏等可再生能源在水电解制氢中的潜在应用推动了双极板的发展。结合理论电导率计算和电极电位- ph图的构建，创新地设计了一种新型Nb:Ti:N双极板膜，具有优异的导电性和耐腐蚀性，以及高的热稳定性和化学稳定性。Nb和N元素提高了Ti和TiO2的电子离域效应和输运能力，在1.4 MPa下，Nb:Ti:N膜修饰的Ti双极板的界面接触电阻降至3.27 mΩ cm2，电导率提高约86% %。在0 <； pH <； 7时，Ti金属和Nb金属均表现出良好的稳定性，钝化区主要以TiO2和Nb2O5的形式存在。在1.8 V （vs. Ag/AgCl）时，Nb金属的耐蚀性较好，Nb金属钝化形成的Nb氧化物阻止了Ti衬底溶解为TiO2+和（TiO2）2+离子。此外，还采用周期性三角波和方波极化电位来模拟风电和光伏的输入。通过对双极板在波动电压输入条件下的耐久性和动态响应特性的评估，可以得出高电位促进Nb:Ti:N薄膜中Nb金属的钝化行为，从而对波动电位引起的电流波动做出快速响应的结论。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.