Graphitic Nanoshell/Mesoporous Carbon Nanohybrids as Highly Efficient and Stable Bifunctional Oxygen Electrocatalysts for Rechargeable Aqueous Na–Air Batteries
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- Jae Yeong Cheon
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST‐gil Ulsan 689‐798 South Korea
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- Kyoungho Kim
- School of Energy and Chemical Engineering UNIST 50 UNIST‐gil Ulsan 689‐798 South Korea
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- Young Jin Sa
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST‐gil Ulsan 689‐798 South Korea
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- Sun Hye Sahgong
- School of Energy and Chemical Engineering UNIST 50 UNIST‐gil Ulsan 689‐798 South Korea
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- Yugyeong Hong
- School of Energy and Chemical Engineering UNIST 50 UNIST‐gil Ulsan 689‐798 South Korea
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- Jinwoo Woo
- School of Energy and Chemical Engineering UNIST 50 UNIST‐gil Ulsan 689‐798 South Korea
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- Sung‐Dae Yim
- Fuel Cell Research Center Korea Institute of Energy Research (KIER) 152 Gajeongro Daejeon 305‐343 South Korea
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- Hu Young Jeong
- UNIST Central Research Facility UNIST 50 UNIST‐gil Ulsan 689‐798 South Korea
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- Youngsik Kim
- School of Energy and Chemical Engineering UNIST 50 UNIST‐gil Ulsan 689‐798 South Korea
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- Sang Hoon Joo
- Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) 50 UNIST‐gil Ulsan 689‐798 South Korea
書誌事項
- 公開日
- 2016-01-18
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1002/aenm.201501794
- 公開者
- Wiley
この論文をさがす
説明
<jats:p>Efficient and cost‐effective bifunctional electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are of vital importance in energy conversion and storage devices. Despite the recent progress in bifunctional oxygen electrocatalysts, their unbalanced and insufficient OER and ORR activities has continued to pose challenges for the practical application of such energy devices. The design of highly integrated, high‐performance, bifunctional oxygen electrocatalysts composed of highly graphitic nanoshells embedded in mesoporous carbon (GNS/MC) is reported. The GNS/MC exhibits very high oxygen electrode activity, which is one of the best performances among nonprecious metal bifunctional oxygen electrocatalysts, and substantially outperforms Ir‐ and Pt‐based catalysts. Moreover, the GNS/MC shows excellent durability for both OER and ORR. In situ X‐ray absorption spectroscopy and square wave voltammetry reveal the roles of residual Ni and Fe entities in enhancing OER and ORR activities. Raman spectra indicate highly graphitic, defect‐rich nature of the GNS/MC, which can contribute to the enhanced OER activity and to high stability for the OER and ORR. In aqueous Na–air battery tests, the GNS/MC air cathode‐based cell exhibits superior performance to Ir/C‐ and Pt/C‐based batteries. Significantly, the GNS/MC‐based cell demonstrates the first example of rechargeable aqueous Na–air battery.</jats:p>
収録刊行物
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- Advanced Energy Materials
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Advanced Energy Materials 6 (7), 1501794-, 2016-01-18
Wiley
