Details

Autor(en) / Beteiligte

• Lin, Haoqing
• liu, Peng
• Wang, Shaofeng
• Zhang, Zhenbao
• Dai, Ziyang
• Tan, Shaozao
• Chen, Dengjie

Titel

A highly efficient electrocatalyst for oxygen reduction reaction: Three-dimensionally ordered macroporous perovskite LaMnO3

Ist Teil von

• Journal of power sources, 2019-02, Vol.412, p.701-709

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Perovskite LaMnO3 is reported to be a superior electrocatalyst for oxygen reduction reaction in terms of the onset potential and intrinsic activity. However, traditionally prepared LaMnO3 is characterized to exhibit a low specific surface area and a limited pore volume. Herein, we synthesize a three-dimensional ordered macroporous LaMnO3 that features ordered and interconnected porous structure, in order to increase catalytic sites. The obtained three-dimensional ordered macroporous LaMnO3 exhibits an increased specific surface area of 20.328 m2 g−1 and pore volume of 0.126 cm3 g−1. Rotating-ring-disk electrode measurement reveals a more positive onset potential (0.827 V) and half-wave potential (0.686 V), and a much higher current-limited density (5.90 mA cm−2) of the three-dimensional ordered macroporous LaMnO3 compared to counterparts, as well as a high electron transfer number (∼4) and a better stability. Furthermore, a LiO2 battery employing the three-dimensional ordered macroporous LaMnO3 as air electrode exhibits excellent electrochemical performance with a higher initial discharge capacity (5592 mAh g−1), a smaller discharge-charge voltage gap (1.56 V), and a higher coulombic efficiency (∼100%) in comparison with the carbon electrode. Our results suggest that traditional perovskite oxides could be effectively optimized for efficient electrocatalytic reactions. [Display omitted] •A three-dimensionally ordered macroporous perovskite LaMnO3 is prepared.•Increased specific surface area and pore volume of LaMnO3 are obtained.•The ordered porous structure is beneficial for oxygen reduction reaction.•A battery employing optimized LaMnO3 exhibits excellent performance.