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Nano Research

Article Title

High-performance oxygen reduction and evolution carbon catalysis: From mechanistic studies to device integration

Authors

John W. F. To, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
Jia Wei Desmond Ng, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research, Jurong Island 627833, Singapore
Samira Siahrostami, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
Ai Leen Koh, Stanford Nano Shared Facilities, Stanford University, Stanford, CA 94305, USA
Yangjin Lee, Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea
Zhihua Chen, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
Kara D. Fong, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
Shucheng Chen, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
Jiajun He, Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, CO 80401, USA
Won-Gyu Bae, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
Jennifer Wilcox, Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, CO 80401, USA
Hu Young Jeong, UNIST Central Research Facilities (UCRF), Ulsan National Institute of Science and Technology (UNIST), Ulsan 689- 98, Republic of Korea
Kwanpyo Kim, Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea
Felix Studt, SUNCAT Center for Interface Science and Catalysis SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstr. 18, 76131 Karlsruhe, Germany
Jens K. Nrskov, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA SUNCAT Center for Interface Science and Catalysis SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
Thomas F. Jaramillo, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
Zhenan Bao, Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA

Keywords

electrocatalysis, porous carbon, density functional theory

Abstract

ABSTRACT The development of high-performance and low-cost oxygen reduction and evolution catalysts that can be easily integrated into existing devices is crucial for the wide deployment of energy storage systems that utilize O2-H2O chemistries, such as regenerative fuel cells and metal-air batteries. Herein, we report an NH3-activated N-doped hierarchical carbon (NHC) catalyst synthesized via a scalable route, and demonstrate its device integration. The NHC catalyst exhibited good performance for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), as demonstrated by means of electrochemical studies and evaluation when integrated into the oxygen electrode of a regenerative fuel cell. The activities observed for both the ORR and the OER were comparable to those achieved by state-of-the-art Pt and Ir catalysts in alkaline environments. We have further identified the critical role of carbon defects as active sites for electrochemical activity through density functional theory calculations and high-resolution TEM visualization. This work highlights the potential of NHC to replace commercial precious metals in regenerative fuel cells and possibly metal-air batteries for cost-effective storage of intermittent renewable energy.

Graphical Abstract

Publisher

Tsinghua University Press

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