氢燃料电池金属双极板表面TiC/a-C:H涂层的制备和表征
Preparation and Characterization of TiC/a-C:H Coating on the Surface of Metal Bipolar Plates in Hydrogen Fuel Cells
王浩琦 1欧伊翔 1华青松 2李飞强 3付薇 2郑威龙 2侯莉 4王连才 4曾心苗 4徐云飞 3曹季东 3曲观书3
作者信息
- 1. 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
- 2. 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
- 3. 北京亿华通科技股份有限公司,北京 100089
- 4. 北京市科学技术研究院辐射技术研究所,北京 100875
- 折叠
摘要
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.
Abstract
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.
关键词
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Key words
metal bipolar plate/nanocomposite coating/corrosion resistance/high conductivity/nc-TiC/a-C:H/filtered cathodic vacuum arc deposition引用本文复制引用
基金项目
国家自然科学基金面上项目(12275028)
广东省重点研发计划(2019B090909002)
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()
出版年
2024
NETL
NSTL
万方数据