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Efficient and stable symmetrical solid oxide fuel cell via A-site non-stoichiometry
Electrochimica Acta ( IF 6.6 ) Pub Date : 2022-06-09 , DOI: 10.1016/j.electacta.2022.140697
Xinghong Zhou , Mingze Li , Weimin Yang , Haibo Hu , Jun Li , Yi Lu , Xiaoyu Wang , Xifeng Ding

Symmetrical solid oxide fuel cells (SSOFCs) with identical anode and cathode have many benefits compared with traditional SOFCs. However, it is still a challenge to find high performance electrode materials with excellent catalytic activity and preferable stability under both reducing and oxidizing atmosphere. Here, a novel Ba0.9La0.1Co0.7Fe0.2Nb0.1O3-δ (BLCFN) perovskite electrode has been developed as promising symmetrical electrode material for SSOFCs. The A-site non-stoichiometry introduced in BLCFN simultaneously enhances both the cathode and anode electrocatalytic performance. The cathode polarization resistance of BLCFN with 5% deficiency is decreased by 28.6% to 0.05 Ω·cm2 at 750°C in air, which can be mainly attributed to the increase of oxygen vacancy concentration via partial ionic defect. The BLCFN anode polarization resistance is reduced by 42.1% to 0.11 Ω·cm2 at 750°C in 5% H2/N2. The promoted hydrogen oxidation reaction activity of BLCFN is related to the exsolved homogeneous Co-Fe nanoparticles from BL95CFN substrate in reducing atmosphere. The full cell with BL95CFN symmetrical electrodes displays high redox stability through reversing the flow of wet hydrogen and ambient air. Additionally, this SSOFCs with strong anchor characteristic of exsolved Co-Fe nanoparticles shows excellent coking-tolerance using methane fuel compared with traditional Ni-SDC anode. This work provides a potential way towards the development of high-performance, excellent redox-stable and coking-tolerant SSOFCs.



中文翻译:

基于 A 位非化学计量的高效稳定对称固体氧化物燃料电池

与传统的 SOFC 相比,具有相同阳极和阴极的对称固体氧化物燃料电池 (SSOFC) 具有许多优点。然而,寻找在还原和氧化气氛下均具有优异催化活性和较好稳定性的高性能电极材料仍然是一个挑战。在这里,一种新型的 Ba 0.9 La 0.1 Co 0.7 Fe 0.2 Nb 0.1 O 3-δ (BLCFN) 钙钛矿电极已被开发为有前途的 SSOFC 对称电极材料。BLCFN中引入的A位非化学计量同时增强了阴极和阳极的电催化性能。不足5%的BLCFN阴极极化电阻降低28.6%至0.05 Ω·cm2在 750°C 的空气中,这主要归因于通过部分离子缺陷增加氧空位浓度。BLCFN 阳极极化电阻在 750°C 在 5% H 2 /N 2中降低 42.1% 至 0.11 Ω·cm 2. BLCFN促进的氢氧化反应活性与BL95CFN基体在还原气氛中析出的均相Co-Fe纳米颗粒有关。具有 BL95CFN 对称电极的全电池通过反转湿氢气和环境空气的流动,显示出高氧化还原稳定性。此外,与传统的 Ni-SDC 阳极相比,这种 SSOFCs 具有很强的外溶 Co-Fe 纳米颗粒锚定特性,在使用甲烷燃料时表现出优异的耐结焦性。这项工作为开发高性能、优异的氧化还原稳定性和耐结焦的 SSOFC 提供了潜在途径。

更新日期:2022-06-09
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