方帅帅,陈旭,李长久.等离子喷涂 Ni/YSZ 氢电极的结构调控及其对 SOEC 的影响[J].热喷涂技术,2021,13(2):48~54.
等离子喷涂 Ni/YSZ 氢电极的结构调控及其对 SOEC 的影响
Effect of Powder Structure on SOEC Performanceof Atmospheric Plasma Sprayed Ni/YSZ Electrode
  
DOI:10.3969/j.issn.1674-7127.2021.02.007
中文关键词:  等离子喷涂  固体氧化物电解池  Ni/YSZ  微观结构  电化学性能
英文关键词:Atmospheric plasma spray  Solid oxide electrolysis cell  Ni/YSZ  Microstructure  Electrochemical performance
基金项目:
        
作者单位
方帅帅 西安交通大学 金属材料强度国家重点实验室
陈旭 西安交通大学 金属材料强度国家重点实验室
李长久 西安交通大学 金属材料强度国家重点实验室
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中文摘要:
      采用不同粒径的 NiO/YSZ 团聚造粒粉末, 通过 Ar/H2 大气等离子喷涂制备了固体氧化物电解池 Ni/YSZ 氢电极, 系统研究了不同粒径粉末形成的氢电极微观结构对电化学性能的影响。 采用 X 射线衍射与扫描电镜表 征了电极的微观结构与成分分布, 采用电化学方法测试了电极的阻抗与电解池的电化学性能。 结果表明不同粉 末制备的涂层成分变化不大, 涂层主要由均匀分布的 NiO 和 YSZ 构成。 电化学性能测试结果表明, 氢电极的催 化活性受粒子熔化程度影响显著, 中等尺度粉末的熔化程度适中, 由其制备的氢电极极化阻抗在 800℃ 为 0.12 Ω·cm2、 600℃为 0.48 Ω·cm2, 由 1 mm 氧化钪稳定氧化锆电解质作为支撑体组装电解池测试表明, 该氢电极的性 能最高, 在电解电压为 1.5 V, 800℃时的电解电流密度为 0.64 A/cm2。
英文摘要:
      Hydrogen production by high temperature steam electrolysis is one of the potential processes to solve the problem of large-scale of hydrogen production. Solid State Electrolysis Cells (SOEC) high-temperature electrolysis of water for hydrogen production has outstanding advantages. The hydrogen production is clean, energy saving and efficient, since the electricity and heat required for electrolysis are provided by renewable energy or advanced nuclear energy, which meets the demands of sustainable development of today's society. Atmosph eric plasma spraying (APS) can be used as cast-effective process for manufacturing functional of the electrode were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The impedance of the electrode and the electrochemical performance of the cells were measured by electrochemical method. XRD showed that the composition of coating was little influenced by different powder particle sizes. However, the microstructure of the electrode changed significantly with powder particle size. SEM showed that the sprayed anodes is mainly composed of uniformly distributed NiO and YSZ. The porosity of the electrode increased with the increase of the powder particle size. The electrochemical performance tests showed that the catalytic activity of sprayed Ni/YSZ was influenced significantly by particle melting degree. The melted NiO and reduced Ni are deposited on the electrolyte surface to improve the contact state between the hydrogen electrode and electrolyte and continuity of electrode, while the unmelted part increases the micro-pores of the electrode. The melting degree of the powder particles with a particle size is 30~50 μm is moderate, thus yielding the hydrogen electrode with the lowest impedance. The output performance of the electrolytic cell assembled by using APS NiO/YSZ hydrogen electrode decreases with the increase of the hydrogen electrode impedance. At 800℃ and 600℃ , the polarization resistance was 0.12 and 0.48 Ω·cm2, respectively. Thereafter, a SOEC is assembled with the APS hydrogen electrode with the lowest impedance prepared using a particle size of 30~50 μm on a 1 mm ScSZ electrolyte for cell performance test. The electrolytic cell showed the best performance, and the current density reached 0.64 A/cm2 when the electrolytic voltage is 1.5 V at 800℃ layers of SOEC including anode, cathode and electrolyte since APS is flexible to deposit different coatings at high deposition rate with easy automation of the process. However, the electrode coating of SOEC prepared by APS presents a typical lamellar structure which is different from that produced by traditional methods such tapecasting. Thus, the effect of the microstructure on the electrode performance should be investigated for optimizing anode to prepare high productive SOEC. Therefore, taking account of dominant effect of powders structure along with their melting on the deposit structure, in this study, Ni/YSZ anodes were deposited by APS using different sizes of agglomerated NiO/YSZ powders. The effects of spray particle features on the anode microstructure and electrochemical performance were systematically studied. The microstructure and composition distribution
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