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Scalable 3-D Carbon Nitride Sponge as an Efficient Metal-Free Bifunctional Oxygen Electrocatalyst for Rechargeable Zn-Air Batteries

Title
Scalable 3-D Carbon Nitride Sponge as an Efficient Metal-Free Bifunctional Oxygen Electrocatalyst for Rechargeable Zn-Air Batteries
Author
이상욱
Keywords
aminoguanidine; carbon nitride sponge; phosphorus and sulfur; Zn-air battery; bifunctional oxygen electrocatalyst
Issue Date
2017-01
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v. 11, no. 1, page. 347-357
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 (similar to 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 electro catalytic 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.
URI
https://pubs.acs.org/doi/10.1021/acsnano.6b05914http://repository.hanyang.ac.kr/handle/20.500.11754/105640
ISSN
1936-0851; 1936-086X
DOI
10.1021/acsnano.6b05914
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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