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Sulfur-Induced Growth of Coordination Polymer Derived-Straight Carbon Nanotubes on Carbon Nanofiber Network for Zn-Air Batteries.
- Source :
-
Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2021 May 17; Vol. 27 (28), pp. 7704-7711. Date of Electronic Publication: 2021 Apr 22. - Publication Year :
- 2021
-
Abstract
- Low-cost heteroatom-doped carbon nanomaterials have been widely studied for efficient oxygen reduction reaction and energy storage and conversion in metal-air batteries. A Masson pine twigs-like 3-dimensional network construction of carbon nanofibers (CNFs) with abundant straight long Co, N, and S-doped carbon nanotubes (CNTs) is developed by thermal treatment of Co-based polymer coated onto polyacrylonitrile nanofiber network together with thiourea at 900 °C, denoted as CNFT-Co <subscript>9</subscript> S <subscript>8</subscript> -900. It is interesting to note that the introduction of a high concentration of sulfur does not lead to the complete toxicity of catalysts, but promotes the axial growth to selectively form straight CNTs instead of curly bamboo-like CNTs. The highly graphitized in-situ grown Co, N, S-doped CNTs and the 3-dimensional N-doped CNF network provide both active catalytic sites and highly conductive paths, which are beneficial for oxygen reduction reaction (ORR). Thus, the optimal CNFT-Co <subscript>9</subscript> S <subscript>8</subscript> -900 performs the excellent ORR catalytic activity with a half-wave potential of 0.84 V and a diffusion-limited current density of 5.49 mA cm <superscript>-2</superscript> . Furthermore, the CNFT-Co <subscript>9</subscript> S <subscript>8</subscript> -900-based Zn-air devices also possess a high power density of 136.9 mW cm <superscript>-2</superscript> better than commercial Pt/C.<br /> (© 2021 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3765
- Volume :
- 27
- Issue :
- 28
- Database :
- MEDLINE
- Journal :
- Chemistry (Weinheim an der Bergstrasse, Germany)
- Publication Type :
- Academic Journal
- Accession number :
- 33780562
- Full Text :
- https://doi.org/10.1002/chem.202005415