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Phosphorylated graphene monoliths with high mixed proton/electron conductivity

Li Cao,ab  Hong Wu,*abc  Zehua Mu,ab  Xueyi He,ab  Chongbin Wang,ab  Jinzhao Li,ab  Yan Li,ab  Mingzhao Xuab  and  Zhongyi Jiang*ab 
Author affiliations

* Corresponding authors

a Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
E-mail: wuhong@tju.edu.cn, zhyjiang@tju.edu.cn
Fax: +86-22-27406646
Tel: +86-22-27406646

b Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China

c Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China

Abstract

A mixed ionic–electronic conductor (MIEC) plays a crucial role in electrochemical technologies relevant to energy conversion and storage. The existing composite materials often suffer from poor mixed conducting performance due to the distinct phase boundaries and random distributions of the transport channels. Herein, we propose the concept for the fabrication of a single-phase MIEC using two-dimensional (2D) building blocks-phosphorylated graphene nanosheets, which are assembled into three-dimensional (3D) interconnected networks with long-range ordered nanochannels. Attributed to the sufficient proton carriers (phosphate groups) confined in electron-conductive nanochannels and the integration of conductive pathways, simultaneously enhanced proton conductivity (0.13 S cm−1) and electron conductivity (0.265 S cm−1) are achieved at 98% RH and 35 °C, surpassing the current performance of all graphene-based MIECs. This approach may pave the way for designing MIECs with high mixed conduction by utilizing the unique properties of 2D materials, beyond the limitations of pure proton-conducting/electron-conducting materials.

Graphical abstract: Phosphorylated graphene monoliths with high mixed proton/electron conductivity

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Publication details

The article was received on 18 Mar 2018, accepted on 09 Apr 2018 and first published on 09 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA02500B
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Phosphorylated graphene monoliths with high mixed proton/electron conductivity

    L. Cao, H. Wu, Z. Mu, X. He, C. Wang, J. Li, Y. Li, M. Xu and Z. Jiang, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA02500B

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