Phase engineering of a donor-doped air electrode for reversible protonic ceramic electrochemical cells

Kang Xu; Hua Zhang; Yangsen Xu; Dongliang Liu; Feng Zhu; Fan He; Ying Liu; Haobing Wang; Yu Chen

Advanced Powder Materials (Jun 2024)

Phase engineering of a donor-doped air electrode for reversible protonic ceramic electrochemical cells

Kang Xu,
Hua Zhang,
Yangsen Xu,
Dongliang Liu,
Feng Zhu,
Fan He,
Ying Liu,
Haobing Wang,
Yu Chen

Affiliations

Kang Xu: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
Hua Zhang: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
Yangsen Xu: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
Dongliang Liu: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
Feng Zhu: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
Fan He: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
Ying Liu: Research Institute of Renewable Energy and Advanced Materials, Zijin Mining Group Co., Ltd., Xiamen 361101, China; Corresponding author.
Haobing Wang: South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou 510640, China
Yu Chen: School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Corresponding author.

Journal volume & issue: Vol. 3, no. 3
p. 100187

Abstract

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Reversible protonic ceramic electrochemical cells (R-PCECs) demonstrate great feasibility for efficient energy storage and conversion. One critical challenge for the development of R-PCECs is the design of novel air electrodes with the characteristics of high catalytic activity and acceptable durability. Here, we report a donor doping of Hf into the B-site of a cobalt-based double perovskite with a nominal formula of PrBa0.8Ca0.2Co1.9Hf0.1O5+δ (PBCCHf0.1), which is naturally reconfigured to a double perovskite PrBa0.8-xCa0.2Co1.9Hf0.1-xO5+δ (PBCCHf0.1-x) backbone and nano-sized BaHfO3 (BHO) on the surface of PBCCHf0.1−x. The air electrode demonstrates enhanced catalytic activity and durability (a stable polarization resistance of 0.269 Ω cm2 for ∼100 h at 600 °C), due likely to the fast surface exchange process and bulk diffusion process. When employed as an air electrode of R-PCECs, a cell with PBCCHf0.1 air electrode demonstrates encouraging performances in modes of the fuel cell (FC) and electrolysis (EL) at 600 °C: a peak power density of 0.998 W cm−2 and a current density of −1.613 A cm−2 at 1.3 V (with acceptable Faradaic efficiencies). More importantly, the single-cell with PBCCHf0.1 air electrode demonstrates good cycling stability, switching back and forth from FC mode to EL mode ±0.5 A cm−2 for 200 h and 50 cycles.

Published in Advanced Powder Materials

ISSN: 2772-834X (Online)
Publisher: KeAi Communications Co. Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/advanced-powder-materials/

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