Details

Autor(en) / Beteiligte

• Liu, Yisi
• Zhang, Yafei
• Chen, Zhicheng
• Li, Zongxu
• Pan, Qiyun
• Li, Zhong
• Du, Yue
• Li, Wenzhang
• Li, Jie

Titel

CeO2 quantum dots embedded in 3D hierarchical porous foliaceous N-doped carbon as an efficient oxygen reduction electrocatalyst for metal-air battery

Ist Teil von

• Journal of alloys and compounds, 2022-06, Vol.905, p.164063, Article 164063

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •A novel CeO2 quantum dots@NC was prepared using a self-sacrifice template method.•CeO2 @NC possesses a 3D hierarchical foliaceous framework and more oxygen vacancies.•The ORR performance of CeO2 @NC-900-2 outperforms that of commercial Pt/C catalyst.•The metal-air battery using CeO2 @NC-900-2 catalyst exhibits excellent performance. A self-sacrifice template method combining with in-situ composite technique was proposed to fabricate a novel CeO2 quantum dots embedded in hierarchical porous foliaceous N-doped carbon with both mesopores and micropores. The Zn-air and Al–air batteries employing the prepared electrocatalysts in cathodes exhibit superior discharge performance with higher open circuit voltages of 1.51 V and 1.76 V, and power densities of 405 mW cm−2 and 468 mW cm−2 to most reported metal–air batteries. [Display omitted] The development of large-scale and highly efficiency catalysts towards oxygen reduction reaction (ORR) is of great significance for the wide application of metal–air batteries. In this work, we propose a self-sacrifice template method combined with in-situ composite technique to fabricate a novel configuration of CeO2 quantum dots embedded in hierarchical porous foliaceous N-doped carbon with both mesopores and micropores. The prepared catalyst exhibits prominent ORR electrocatalytic performance with higher half-wave potential, lower Tafel slope, and enhanced durability comparing with the commercial Pt/C catalyst. Furthermore, the Zn-air and Al–air batteries employing the prepared electrocatalysts in cathodes exhibit superior discharge performance with high open circuit voltages of 1.51 V and 1.76 V, and peak power densities of 204 and 458 mW cm−2, respectively, compared to most reported metal–air batteries. The greatly enhanced electrocatalytic performance can be ascribed to the abundant oxygen vacancies, improved redox property of Ce3+/Ce4+ as well as the three-dimensional hierarchical porous structure. This work provides a valuable chance to develop scalable quantum dot level composite catalysts in metal–air batteries.