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N,O-codoped porous carbon nanosheets for capacitors with ultra-high capacitance

氮氧共掺杂多孔碳片用于超高比容量的超级电容器

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Abstract

Significant enhancement of energy density of electrical double layered capacitors is a major challenge for electrochemical capacitors to conquer the emerging field of large scale renewable energy storage. The enhancement of specific capacitance is an effective strategy to obtain higher energy density. Addition of redox mediator in the electrolyte as pseudocapacitive sources could enhance the specific capacitance, but well-coupled electrode materials should be developed as well. Herein, as a proof-of-concept experiment, N, O-codoped porous carbon nanosheets have been fabricated, wherein graphene oxide is employed as both oxygen source as well as structure directing agent. Unexpectedly, the obtained electrode materials endow electrical double layered capacitors with excellent capacitive performances, including the ultra-high specific capacitance (5073.5 F g−1) and excellent cycling stability, which could be attributed to the synergy of morphology and surface chemistry of N, O-codoped porous carbon nanosheets. These results would form the basis for an unprecedented perspective in the development of next generation electrode materials for electrical double layered capacitors.

摘要

如何有效提升双层电容器的能量密度是一个亟待解决的重大课题, 而提高其比容量是其中一种有效提高能量密度的常用方法. 与常见的加入赝电容材料的方法不同, 本论文通过在电解液中加入氧化还原介质的方法达到提升比容量的目的. 在这一方法中, 得到显著提高的比容量主要来源于氧化还原介质贡献的氧化还原行为. 这一方法的优异之处在于氧化还原反应是发生在电解液中而非电极材料上, 因此在一定程度上保证了电极材料的稳定性. 在电极材料的设计上, 通过简便的方法制备得到了氮氧共掺杂多孔碳片. 在这一合成过程中, 氧化石墨不仅可以提供氧实现杂原子掺杂, 而且它的二维片状结构可以作为模板诱导碳片的形成. 经制备的碳材料在氧化还原电解液体系中获得了优异的电化学性能, 尤其表现在它超高的比容量(5073.5 F g−1). 这一优异的电化学性能得益于碳片材料独特的形貌结构、表面特征以及它与电解液之间的相互作用. 本文中使用氧化还原介质来提升比容量的方法为高性能双电层电容器的设计提供了新的方向.

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Author information

Authors and Affiliations

  1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    Zhong Wu  (吴中) & Xin-bo Zhang  (张新波)

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Zhong Wu  (吴中)

Authors
  1. Zhong Wu  (吴中)
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  2. Xin-bo Zhang  (张新波)
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Corresponding author

Correspondence to Xin-bo Zhang  (张新波).

Additional information

Zhong Wu received her BSc degree from the College of Chemistry and Materials Science, Anhui Normal University in 2010. She obtained her PhD degree under the direction of Prof. Xinbo Zhang at Changchun Institute of Applied Chemistry (CIAC), Chinese Academy of Sciences (CAS) in 2016. Her research interests focus on the synthesis and characterization of advanced inorganic nanomaterials, especially metal-oxide and carbon-based materials and their application in supercapacitors.

Xinbo Zhang is a full professor at CIAC, CAS. He obtained his PhD in inorganic chemistry from CIAC, CAS in 2005. From 2005–2009, he worked as a Japan Society for the Promotion of Science (JSPS) postdoctoral fellow (2005–2007) and a the New Energy and Industrial Technology Development Organization (NEDO) research associate (2007–2009) at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. His interests mainly focus on functional inorganic materials for batteries, fuel cells, electrochemical water splitting and carbon dioxide reduction. He has published over 70 peer-reviewed articles, including Nat Commun, JACS, Angew Chem Int Ed, Adv Mater, Chem Soc Rev, Energy Environ Sci, with more than 5000 citations and H-index of 40. He also holds or has filed over 20 patents and patent applications. Selected awards include “Hundred Talents Program” of CAS (2011), the Excellent Young Scholars of NSFC (2014), and Young Top-Notch Talent (2015).

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Wu, Z., Zhang, Xb. N,O-codoped porous carbon nanosheets for capacitors with ultra-high capacitance. Sci. China Mater. 59, 547–557 (2016). https://doi.org/10.1007/s40843-016-5067-4

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  • DOI: https://doi.org/10.1007/s40843-016-5067-4

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