首页|氢燃料电池金属双极板表面TiC/a-C:H涂层的制备和表征

氢燃料电池金属双极板表面TiC/a-C:H涂层的制备和表征

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研究沉积离子能量对沉积在氢燃料电池金属双极板表面的TiC/a-C:H涂层导电性和耐腐蚀性能影响.通过磁过滤真空阴极弧沉积技术以Ti靶为Ti源,通入乙炔气体在-100~-500 V基体负偏压下于SS 304不锈钢和单晶硅表面沉积了厚度为0.52~1.05 µm的TiC/a-C:H复合涂层,研究分析了涂层的微观结构、涂层成分、相结构、耐腐蚀性能和导电性能的变化规律.结果表明,在-100~-500 V基体负偏压下沉积的TiC/a-C:H复合涂层均呈现致密的低缺陷特征,涂层为非晶碳包覆的nc-TiC纳米晶所构建的纳米晶/非晶复合结构,随着负偏压增大,涂层中纳米晶尺寸从3.3 nm增至7.9 nm.最优的nc-TiC/a-C:H涂层(负偏压-100 V)在模拟氢燃料电池腐蚀环境(80 ℃,0.5 mol/L H2SO4+2 μL/L HF水溶液)下实现了 5.25×10-8μA/cm2的超低腐蚀电流密度,在1.4 MPa的压紧力下实现了 1.49mΩ/cm2的极低ICR值.采用磁过滤真空阴极弧沉积法制备的nc-TiC/a-C:H涂层可以在宽的负偏压范围内有效提高SS 304不锈钢双极板的耐腐蚀和导电性,满足DOE 2025目标对氢燃料电池双极板的性能需求,该工作为大规模制备高性能金属双极板涂层开辟了一条新途径.
Preparation and Characterization of TiC/a-C:H Coating on the Surface of Metal Bipolar Plates in Hydrogen Fuel Cells
The influences of deposition ion energy on the conductivity and corrosion resistance of TiC/a-C:H coatings deposited on metal bipolar plates for hydrogen fuel cells were investigated.TiC/a-C:H nanocomposite coatings with thickness of 0.52-1.05 μm were deposited on SS 304 stainless steel and Si substrate under bias voltages from-100 V to-500 V by filtered cathodic vacuum arc deposition with Ti target in acetylene atmosphere.The microstructure,composition,phase structure,corrosion resistance,and conductivity of the coatings were studied and analyzed.The results show that the TiC/a-C:H nanocomposite coatings deposited under bias voltages from-100 V to-500 V exhibit dense and low-defect characteristics.The coatings are composed of nanocrystalline/amorphous composite structure built by nanocrystalline nc-TiC coated with amorphous carbon.The nanocrystal size in the coatings increases from 3.3 nm to 7.9 nm with the increase in the bias voltage from-100 V to-500 V.The optimal nc-TiC/a-C:H coating(bias voltage-100 V)achieves a very low corrosion current density of 5.25×10-8 μA/cm2 in a simulated hydrogen fuel cell corrosion environment(80 ℃,0.5 mol/L H2SO4+2 μL/L HF solution)and an extremely low interfacial contact resistance(ICR)value of 1.49 mΩ.cm2 under 1.4 MPa compression force.The nc-TiC/a-C:H coatings prepared by filtered cathodic vacuum arc deposition can effectively improve the corrosion resistance and conductivity of SS 304 stainless steel bipolar plates over a wide range of bias voltages,meeting the performance requirements of DOE 2025 for hydrogen fuel cell bipolar plates.This work opens up a new pathway for the large-scale preparation of high-performance metal bipolar plate coatings.

metal bipolar platenanocomposite coatingcorrosion resistancehigh conductivitync-TiC/a-C:Hfiltered cathodic vacuum arc deposition

王浩琦、欧伊翔、华青松、李飞强、付薇、郑威龙、侯莉、王连才、曾心苗、徐云飞、曹季东、曲观书

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北京师范大学核科学与技术学院射线束技术教育部重点实验室,北京 100875

北京市科学技术研究院辐射技术研究所,北京 100875

北京亿华通科技股份有限公司,北京 100089

金属双极板 纳米复合涂层 耐腐蚀 高导电率 nc-TiC/a-C:H 磁过滤真空阴极弧沉积

国家自然科学基金面上项目广东省重点研发计划北京市科学与技术研究院2023年财政项目创新工程和2023年创新培育项目北京亿华通科技股份公司委托项目

122750282019B090909002

2024

稀有金属材料与工程
中国有色金属学会,中国材料研究学会,西北有色金属研究院

稀有金属材料与工程

CSTPCD北大核心
影响因子:0.634
ISSN:1002-185X
年,卷(期):2024.53(9)