电解
电化学
电极
材料科学
无机化学
可逆氢电极
氧气
钙钛矿(结构)
电解水
析氧
电化学能量转换
标准氢电极
化学工程
克拉克电极
电解质
化学
参比电极
有机化学
物理化学
工程类
作者
Zuoqing Liu,Dongfang Cheng,Yinlong Zhu,Mingzhuang Liang,Jing Wang,Guangming Yang,Ran Ran,Wei Wang,Wei Zhou,Zongping Shao
标识
DOI:10.1016/j.cej.2022.137787
摘要
Driven by the demand for the sustainable regeneration of clean energy and high-efficiency low-cost energy conversion equipment, reversible proton ceramic electrochemical cells (R-PCECs), which are promising for realizing the mutual conversion between large-scale renewable electric energy and chemical energy, are receiving constant attention. Unfortunately, the sluggish activity of oxygen reduction reaction (ORR) and water oxidation reaction (WOR) for the oxygen electrode in the low and medium temperature ranges and the poor durability of reversible operation block the large-scale application of R-PCECs. Here, a novel oxygen electrode Ba0.5Sr0.5(Co0.8Fe0.2)0.95P0.05O3-δ (BSCFP0.05) with high electrochemical activity and stability is developed. By partially doping non-metallic phosphorus (P) element into the B-site transition metal of the classic oxygen electrode Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF), the electronic conductivity, ions (O2−/H+) transport capacity, and hydration ability are all significantly boosted. Especially, a single cell with the BSCFP0.05 electrode achieves an excellent peak power density of 842 mW cm−2 and an electrolysis current of −1000 mA cm−2 at 1.3 V at 600 °C. No significant attenuation appears during continuous conversion operation between the fuel cell model and the electrolysis cell model for up to 240 h with the BSCFP0.05 oxygen electrode. These results highly promise non-metal-doped oxygen electrode materials in practical R-PCECs.
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