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

被引:0
作者
Luo, Xiejing [1 ]
Chang, Luqi [1 ]
Ren, Chenhao [1 ]
Ding, Yingyu [1 ]
Zhang, Jiuhong [1 ]
Zhang, Dawei [1 ]
Yao, Jizheng [2 ]
Deng, Zhanfeng [2 ]
Dong, Chaofang [1 ]
机构
[1] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing Adv Innovat Ctr Mat Genome Engn, Key Lab Corros & Protect,MOE, Beijing 100083, Peoples R China
[2] Beijing Inst Smart Energy, Beijing 102209, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
Proton exchange membrane; Water electrolyser; Bipolar plates; Fluctuation; Corrosion; 316L STAINLESS-STEEL; POURBAIX DIAGRAMS; TEMPERATURE; PERFORMANCE; CORROSION; TITANIUM; HYDROGEN;
D O I
10.1016/j.corsci.2025.112803
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 m Omega cm(2) 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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页数:15
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