摘要
采用不同粒径的NiO/YSZ团聚造粒粉末,通过Ar/H_(2)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0.12Ω·cm^(2)、600℃为0.48Ω·cm^(2),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/cm^(2)。
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 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 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
作者
方帅帅
陈旭
李长久
Fang Shuaishuai;Chen Xu;Li Changjiu(State key Laboratory of Mechanical Behavior for Materials,Xi'an Jiaotong University,Xi'an 710049)
出处
《热喷涂技术》
2021年第2期48-54,共7页
Thermal Spray Technology
基金
国家重点研发计划项目(2017YFE0105900)
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
Atmospheric plasma spray
Solid oxide electrolysis cell
Ni/YSZ
Microstructure
Electrochemical performance
