Layer-structured Li1-xNaxNi0.8Co0.15Al0.05O2-d oxide anode for enhancing ceria electrolyte based solid ceramic fuel cell operating at lower temperatures down to 370 °C
Layer-structured Li1-xNaxNi0.8Co0.15Al0.05O2-d oxide anode for enhancing ceria electrolyte based solid ceramic fuel cell operating at lower temperatures down to 370 °C
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层状结构Li1-xNaxNi0.8Co0.15Al0.05O2-d氧化物阳极可增强二氧化铈电解质基固体陶瓷燃料电池在低至370°C的低温下运行
DOI：
10.1016/j.apenergy.2023.120788
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发表时间：
2023
期刊：
影响因子：
11.2
通讯作者：
Huang L
中科院分区：
文献类型：
--
作者：
Huang L
研制了一种以CeO 2为电解质的层状结构Li 1-xNaxNi0.8Co0.15Al0.05O2（LNNCA）阳极固体陶瓷燃料电池（SCFC）。使用LNNCA阳极的燃料电池在550 °C下达到了884 mW cm− 2的最大功率密度，比原始LNCA阳极高出约1.6倍。同时，L0.8N0.2NCA阳极呈现出良好的低温特性，在370 °C下仍然可以工作，功率密度为63 mW cm−2。掺杂Na+的锚定效应对保持LNNCA的层状结构起着至关重要的作用。它减少了Li+/Ni 2+的混合，抑制了Ni在LNNCA表面的生长，从而提高了阳极的催化活性和与CeO 2电解质的电接触。此外，Na掺杂富集了氧空位，促进了LNNCA阳极表面吸附氢的解离，从而提高了氢氧化反应活性。另一方面，LNNCA阳极原位生成的低熔点NaOH能有效地增强阳极与电解质之间的界面结合，并渗透到电解质中，为质子等离子提供额外的传输通道，从而降低极化电阻，使SCFC在370 °C下仍能正常工作。
A ceria electrolyte-based solid ceramic fuel cell (SCFC) with a layer-structured Li1-xNaxNi0.8Co0.15Al0.05O2(LNNCA) anode has been developed. The fuel cell with LNNCA anode achieved a maximum power density of 884 mW cm−2at 550 °C, which is about 1.6 times higher than the pristine LNCA anode. Meanwhile, the L0.8N0.2NCA anode presents a good low temperature characteristic, and it could still be operable at 370 °C with the power density of 63 mW cm−2. The anchoring effect of doped Na+plays a vital role in maintaining the layered structure of LNNCA. It decreases Li+/Ni2+intermixing, and inhibits Ni growing on the surface of LNNCA, which enhance the catalytic activity and electrical contact of the anode with the ceria electrolyte. Furthermore, Na-doping enriches oxygen vacancies, and promotes the dissociation of adsorbed hydrogen on the surface of LNNCA anode, and thus improves the hydrogen oxidation reaction activity. On the other hand, the in-situ grown NaOH, which has a low-melting temperature, derived from LNNCA anode, can effectively strengthen the bonding between the anode and the electrolyte at the interface, as well as penetrate into electrolyte and provide extra transport channels for proton and other ions, thus decrease the polarization resistance and enable the SCFC to performance even at 370 °C.