School of Mechanical Engineering, Korea University, Anam-ro 145, Seongbuk-gu, Seoul 02841, Republic of Korea.
High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea.
Nat Commun. 2017 Feb 23;8:14553. doi: 10.1038/ncomms14553.
In reducing the high operating temperatures (≥800 °C) of solid-oxide fuel cells, use of protonic ceramics as an alternative electrolyte material is attractive due to their high conductivity and low activation energy in a low-temperature regime (≤600 °C). Among many protonic ceramics, yttrium-doped barium zirconate has attracted attention due to its excellent chemical stability, which is the main issue in protonic-ceramic fuel cells. However, poor sinterability of yttrium-doped barium zirconate discourages its fabrication as a thin-film electrolyte and integration on porous anode supports, both of which are essential to achieve high performance. Here we fabricate a protonic-ceramic fuel cell using a thin-film-deposited yttrium-doped barium zirconate electrolyte with no impeding grain boundaries owing to the columnar structure tightly integrated with nanogranular cathode and nanoporous anode supports, which to the best of our knowledge exhibits a record high-power output of up to an order of magnitude higher than those of other reported barium zirconate-based fuel cells.
在降低固体氧化物燃料电池的高温操作温度（≥800°C）方面，由于质子陶瓷在低温区（≤600°C）具有高导电性和低活化能，因此作为替代电解质材料具有吸引力。在许多质子陶瓷中，由于其优异的化学稳定性，掺钇钡锆酸盐引起了人们的关注，这是质子陶瓷燃料电池中的主要问题。然而，掺钇钡锆酸盐的烧结性能差阻碍了其作为薄膜电解质的制备以及在多孔阳极支撑体上的集成，这两者对于实现高性能都是必不可少的。在这里，我们使用薄膜沉积的掺钇钡锆酸盐电解质制造了质子陶瓷燃料电池，由于与纳米颗粒阴极和纳米多孔阳极支撑体紧密集成的柱状结构，没有阻碍晶粒边界，据我们所知，其功率输出达到了创纪录的水平，比其他报道的基于钡锆酸盐的燃料电池高出一个数量级。
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