Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 590, Issue -, Pages 476-486Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.01.093
Keywords
CoMn layered double hydroxides; Graphene aerogel; N,P dual-doping; Oxygen reduction reaction; Oxygen evolution reaction; Zinc-air battery
Categories
Funding
- National Natural Science Foundation of China [21437001]
Ask authors/readers for more resources
A novel porous structure design was developed in this study, where two-dimensional nanosheets were vertically anchored on a three-dimensional graphene framework, resulting in excellent bifunctional oxygen electrocatalytic activity and enhanced performance and stability of zinc-air batteries.
Exploiting the low-cost and high-efficiency bifunctional oxygen electrocatalysts to substitute platinum-group metals is highly desirable but challenging for energy storage/conversion technologies. Herein, we develop a combined gelation/self-assemble/freeze drying process to fabricate a free-standing porous architectures through vertical anchoring two-dimensional (2D) CoMn-LDH nanosheets on three-dimensional (3D) hierarchical N,P co-doped graphene aerogels (NPGA) framework. This unique configuration endows CoMn-LDH/NPGA outstanding catalytic activity toward both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) with a potential difference of ca. 0.72 V between the OER potential at 10 mA cm(-2) and the ORR potential at -3 mA cm(-2), which is comparable to commercial Pt/C + IrO2 benchmarks, and therefore renders the CoMn-LDH/NPGA assembled zinc-air battery a superior rechargeable performance and cycling stability. In-depth structure-to-property correlation indicates that the prominent bifunctional activity of CoMn-LDH/NPGA are ascribed to large electrochemical active surface area, the rapid mass/charge transfers, the increased exposure and full utilization of active sites originated from the synergistic effect between the uniformly dispersed 2D CoMn-LDH nanosheets and the 3D hierarchical porous NPGA framework. (C) 2021 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available