Scalable 3-D Carbon Nitride Sponge as an Efficient Metal-Free Bifunctional Oxygen Electrocatalyst for Rechargeable Zn-Air Batteries
- Authors
- Sambhaji S.; Lee, Chi-Ho; Sami, Abdul; Kim, Dong-Hyung; Lee, Sang Uck; 이정호
- Issue Date
- Jan-2017
- Publisher
- American Chemical Society
- Keywords
- aminoguanidine; bifunctional oxygen electrocatalyst; carbon nitride sponge; phosphorus and sulfur; Zn-air battery
- Citation
- ACS Nano, v.11, no.1, pp.347 - 357
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Nano
- Volume
- 11
- Number
- 1
- Start Page
- 347
- End Page
- 357
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/177788
- DOI
- 10.1021/acsnano.6b05914
- ISSN
- 1936-0851
- Abstract
- Rational design of efficient and durable bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts is critical for rechargeable metal-air batteries. Here, we developed a facile strategy for fabricating three-dimensional phosphorus and sulfur codoped carbon nitride sponges sandwiched with carbon nanocrystals (P,S-CNS). These materials exhibited high surface area and superior ORR and OER bifunctional catalytic activities than those of Pt/C and RuO2, respectively, concerning its limiting current density and onset potential. Further, we tested the suitability and durability of P,S-CNS as the oxygen cathode for primary and rechargeable Zn-air batteries. The resulting primary Zn-air battery exhibited a high open-circuit voltage of 1.51 V, a high discharge peak power density of 198 mW cm-2, a specific capacity of 830 mA h g-1, and better durability for 210 h after mechanical recharging. An extraordinary small charge-discharge voltage polarization (0.80 V at 25 mA cm-2), superior reversibility, and stability exceeding prolonged charge-discharge cycles have been attained in rechargeable Zn-air batteries with a three-electrode system. The origin of the electrocatalytic activity of P,S-CNS was elucidated by density functional theory analysis for both oxygen reactions. This work stimulates an innovative prospect for the enrichment of rechargeable Zn-air battery viable for commercial applications such as armamentaria, smart electronics, and electric vehicles. © 2016 American Chemical Society.
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