High Surface Area SOFC Electrode Materials Prepared at Traditional Sintering Temperatures
High Surface Area SOFC Electrode Materials Prepared at Traditional Sintering Temperatures
复制标题
DOI：
10.1149/2.0381802jes
复制
发表时间：
2018
影响因子：
3.9
通讯作者：
S. Muhoza;T. Barrett;M. Cottam;S. E. Soll;M. Yuce;V. S. Prathab;S. Hambright;M. Rezazad;O. Racchi;M. Gross
中科院分区：
文献类型：
--
作者：
S. Muhoza;T. Barrett;M. Cottam;S. E. Soll;M. Yuce;V. S. Prathab;S. Hambright;M. Rezazad;O. Racchi;M. Gross
在传统的烧结温度（1050 ~ 1350 ℃）下，将无机-有机杂化材料在惰性气氛中烧结，然后在空气中于700 ℃煅烧，制备了比表面积达99 m2· g-1的固体氧化物燃料电池（SOFC）电极材料.研究的电极材料是氧化钇稳定的氧化锆（YSZ），镧锶钴铁氧体（LSCF），氧化钆掺杂的氧化铈（GDC），和钛酸锶（STO）。在烧结过程中，无定形碳模板原位形成并在整个烧结过程中保留，有助于混合金属氧化物纳米形态的产生和保存。碳模板在随后的空气中在700 ℃下煅烧期间被除去，留下纳米结构的陶瓷。确定每种混合金属氧化物的相稳定性、碳模板浓度和比表面积。YSZ、LSCF、GDC和STO的最终比表面积分别达到83、66、95和99 m2· g-1。在550 ℃-800 ℃温度范围内，评价了高比表面积YSZ对对称YSZ-镧锶铁氧体（LSF）阴极电池性能的影响。加入纳米结构YSZ后，在550 C下的电化学阻抗降低了45%.随着温度的升高，性能改善减少，并且在800 ℃下基本上没有改善。研究结果揭示了一个有前途的方法，以提高低温SOFC的性能。
Solid oxide fuel cell (SOFC) electrode materials with surface areas up to 99 m 2· g− 1 were prepared at traditional sintering temperatures, 1050 C–1350 C, by sintering hybrid inorganic-organic materials in an inert atmosphere followed by calcination in air at 700 C. The electrode materials investigated were yttria-stabilized zirconia (YSZ), lanthanum strontium cobalt ferrite (LSCF), gadolinia doped ceria (GDC), and strontium titanate (STO). During sintering, an amorphous carbon template forms in situ and remains throughout the sintering process, aiding in the creation and preservation of mixed-metal-oxide nanomorphology. The carbon template is removed during subsequent calcination in air at 700 C, leaving behind a nanostructured ceramic. Phase stability, carbon template concentration, and specific surface area was determined for each mixed-metal-oxide. Final specific surface areas up to 83, 66, 95, and 99 m 2· g− 1 were achieved for YSZ, LSCF, GDC, and STO, respectively. The impact of high surface area YSZ on symmetrical YSZ-lanthanum strontium ferrite (LSF) cathode cell performance was evaluated in the temperature range of 550 C–800 C. Adding nanostructured YSZ decreased the electrochemical impedance by 45% at 550 C. The performance improvement lessened with increasing temperature, and at 800 C there was essentially no improvement. The findings reveal a promising approach to improving low temperature SOFC performance.