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Highly boron-doped holey graphene for lithium oxygen batteries with enhanced electrochemical performance.
- Source :
-
Carbon . Apr2022, Vol. 189, p404-412. 9p. - Publication Year :
- 2022
-
Abstract
- The development of advanced catalyst cathode with high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities, low cost and rich natural resource is a key to improve the electrochemical performance of rechargeable lithium oxygen batteries (LOBs). Heteroatoms-doped carbon nanomaterials as cathodes for LOBs with improved electrochemical performance have attracted great attentions. Herein, we report an approach to synthesize holey graphene and a boron doped holey graphene (B-hG) with plenty of holey structure and high B doping level of 6 at. %. Benefiting from plenty of holey structures and B related active sites to accelerate the ORR and OER kinetics, the B-hGs (e.g. , B-hG-700) cathode displays an extremely high capacity of 19698 mA h g−1 at 100 mA g−1 and long cycling stability over 120 cycles. Both experimental results and density functional theory calculations indicate that the discharge products (e.g. , Li 2 O 2) prefer to nucleate and vertically grow near holes/edges sites, which facilitates the formation of relatively isolated and uniformly distributed Li 2 O 2. Such formation process significantly reduces the agglomeration of Li 2 O 2 and effectively provides many spaces to accommodate Li 2 O 2 , thus leading to the enhanced ORR and OER kinetic. [Display omitted] • The hG was produced by annealing GO with the Mn species ,followed by an acid washing process. • 6.7at.% B was successfully doped to hG to form B-hG-700. • The B-hG-700 as cathode for LOB displays outstanding lithium storage properties. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00086223
- Volume :
- 189
- Database :
- Academic Search Index
- Journal :
- Carbon
- Publication Type :
- Academic Journal
- Accession number :
- 154823202
- Full Text :
- https://doi.org/10.1016/j.carbon.2021.12.061