{"title":"A composite oxygen electrode with high oxygen reduction and evolution activities for reversible solid oxide cells","authors":"","doi":"10.1016/j.ijhydene.2024.10.117","DOIUrl":null,"url":null,"abstract":"<div><div>Reversible solid oxide cells (RSOCs) are highly efficient energy conversion devices for electricity generation and hydrogen production. However, their commercialization is significantly hindered by the slow oxygen reduction/evolution reaction (ORR/OER) activity of oxygen electrodes and the insufficient durability of the RSOCs. Herein, an active and durable PrBa<sub>0.8</sub>Ca<sub>0.2</sub>Co<sub>1.5</sub>Fe<sub>0.5</sub>O<sub>5+<em>δ</em></sub>–Ce<sub>0.8</sub>Gd<sub>0.2</sub>O<sub>2-δ</sub> (PBCCF–GDC) composite oxygen electrode with mediate thermal expansion is developed, achieving a low polarization resistance of 0.058 Ω cm<sup>2</sup> at 750 °C. The PBCCF–GDC oxygen electrode has been applied and evaluated in both the button cell (Φ = 20 mm) and large-area cell (10 × 10 cm<sup>2</sup>), respectively. When utilized as an oxygen electrode in button cell, it achieves a peak power density of 0.88 W cm<sup>−2</sup> in the fuel cell (FC) mode, and a current density of −1.51 A cm<sup>−2</sup> at 1.3 V with 70% H<sub>2</sub>O in the electrolysis cell (EC) mode at 750 °C, and favorable stability in the both FC and EC modes. When utilized in large-area cell, it exhibits a power of 29.5 W and good stability over 330 h, and an impressive electrolysis current of −27A at 1.3 V with 70% H<sub>2</sub>O at 750 °C. The results indicate that PBCCF–GDC is a promising oxygen electrode material for RSOCs.</div></div>","PeriodicalId":337,"journal":{"name":"International Journal of Hydrogen Energy","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Hydrogen Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S036031992404312X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Reversible solid oxide cells (RSOCs) are highly efficient energy conversion devices for electricity generation and hydrogen production. However, their commercialization is significantly hindered by the slow oxygen reduction/evolution reaction (ORR/OER) activity of oxygen electrodes and the insufficient durability of the RSOCs. Herein, an active and durable PrBa0.8Ca0.2Co1.5Fe0.5O5+δ–Ce0.8Gd0.2O2-δ (PBCCF–GDC) composite oxygen electrode with mediate thermal expansion is developed, achieving a low polarization resistance of 0.058 Ω cm2 at 750 °C. The PBCCF–GDC oxygen electrode has been applied and evaluated in both the button cell (Φ = 20 mm) and large-area cell (10 × 10 cm2), respectively. When utilized as an oxygen electrode in button cell, it achieves a peak power density of 0.88 W cm−2 in the fuel cell (FC) mode, and a current density of −1.51 A cm−2 at 1.3 V with 70% H2O in the electrolysis cell (EC) mode at 750 °C, and favorable stability in the both FC and EC modes. When utilized in large-area cell, it exhibits a power of 29.5 W and good stability over 330 h, and an impressive electrolysis current of −27A at 1.3 V with 70% H2O at 750 °C. The results indicate that PBCCF–GDC is a promising oxygen electrode material for RSOCs.
期刊介绍:
The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc.
The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.