Naitao Yang

Novel cathode-supported hollow fibers for light weight micro-tubular solid oxide fuel cells with an active cathode functional layer

Micro-tubular SOFCs have the potential to become light-weight portable auxiliary power units for aircraft or spacecraft. In this work, a novel dual-layer ceramic hollow fiber for a cathode-supported micro-tubular solid oxide fuel cell (MT-SOFC) has been successfully developed via a co-spinning-sintering technique. The green cathode hollow fibers, in dual layer configuration, consisting of a La0.8Sr0.2MnO3−δ (LSM) main layer and a LSM–Y2O3 stabilized ZrO2 (YSZ) functional layer with increased three phase boundary length, are first prepared by co-spinning, which are then sintered at around 1350 °C to allow the creation of sufficient mechanical strength. Other cell components like the electrolyte (YSZ) and anode (NiO + YSZ) are then coated separately. The coated electrolyte film with a thickness of around 27 μm is obtained by co-sintering of YSZ/LSM–YSZ/LSM in a sandwich structure. The porous LSM substrate functions as an oxygen-supplying and current collecting layer. The prepared MT-SOFC, tested with hydrogen as the fuel and air as the oxidant, delivers a maximum power density of up to 475 mW cm−2 at 850 °C, which is much higher than that of a similar cell without a cathode functional layer.

Synthesis and characterization of SrCe0.95Y0.05O3-δ nano powders by low temperature combustion

Abstract Nanosized SrCe 0.95 Y 0.05 O 3-δ powders with homogeneous composition were synthesized by the low temperature combustion process based on the Pechini method. A polymeric precursor sol was formed by using citric acid and ethylene glycol as the chelating agents of metal ions. The perovskite-type SrCe 0.95 Y 0.05 O 3-δ powders with uniform shape and smaller than 25 nm in size were obtained through the combustion of the polymeric precursor sol at the existence of nitric acid and ammonium hydroxide. It was found that modulating the quantities of nitric acid and ammonium hydroxide could control the particle size, and the quantities of residue carbonate ions were also affected by the quantities of citric acid and ethylene glycol.

Electrolyte Thickness Control and Its Effect on YSZ/Ni-YSZ Dual-layer Hollow Fibres: Electrolyte Thickness Control and Its Effect on YSZ/Ni-YSZ Dual-layer Hollow Fibres

本研究利用相转化共纺丝法一步制备出微管式固体氧化物燃料电池(MT-SOFC)用电解质/阳极(YSZ/NiO-YSZ)双层中空纤维膜, 将制得的YSZ/NiO-YSZ双层中空纤维膜前驱体经1450℃烧结后, 以纯H 2 在700℃下还原4 h得到YSZ/Ni-YSZ双层中空纤维膜。电解质YSZ膜层厚度通过改变YSZ铸膜液挤出速率来调节。将La 0.8 Sr 0.2 MnO 3- δ (LSM)阴极乳浆浸渍涂覆在烧结后的YSZ/NiO-YSZ双层中空纤维膜外, 经1200℃烧结后形成微管式固体氧化物燃料电池。结果表明, 当阳极铸膜液以10?mL/min速率挤出, 而电解质铸膜液挤出速率为0.5、1、1.5、2 mL/min时, 构造的YSZ/Ni-YSZ双层中空纤维膜电解质层厚度分别为6、13、18、28 μm, 其机械强度、气密性均随着电解质层厚度增加而增大, 但电导率与孔隙率受电解质层厚度的影响较小。YSZ膜厚度为28 μm的MT-SOFC, 800℃时以20 mL/min氢气作为燃料, 30 mL/min空气作为氧化剂, 最大开路电压为1.01 V, 最大输出功率只有75 mW/cm 2 。但同样测试条件下, YSZ膜厚度为6 μm的MT-SOFC, 开路电压为0.92 V, 最大输出功率升至329 mW/cm 2 。本研究利用相转化共纺丝法一步制备出微管式固体氧化物燃料电池(MT-SOFC)用电解质/阳极(YSZ/NiO-YSZ)双层中空纤维膜, 将制得的YSZ/NiO-YSZ双层中空纤维膜前驱体经1450℃烧结后, 以纯H 2 在700℃下还原4 h得到YSZ/Ni-YSZ双层中空纤维膜。电解质YSZ膜层厚度通过改变YSZ铸膜液挤出速率来调节。将La 0.8 Sr 0.2 MnO 3- δ (LSM)阴极乳浆浸渍涂覆在烧结后的YSZ/NiO-YSZ双层中空纤维膜外, 经1200℃烧结后形成微管式固体氧化物燃料电池。结果表明, 当阳极铸膜液以10?mL/min速率挤出, 而电解质铸膜液挤出速率为0.5、1、1.5、2 mL/min时, 构造的YSZ/Ni-YSZ双层中空纤维膜电解质层厚度分别为6、13、18、28 μm, 其机械强度、气密性均随着电解质层厚度增加而增大, 但电导率与孔隙率受电解质层厚度的影响较小。YSZ膜厚度为28 μm的MT-SOFC, 800℃时以20 mL/min氢气作为燃料, 30 mL/min空气作为氧化剂, 最大开路电压为1.01 V, 最大输出功率只有75 mW/cm 2 。但同样测试条件下, YSZ膜厚度为6 μm的MT-SOFC, 开路电压为0.92 V, 最大输出功率升至329 mW/cm 2 。