Issue 48, 2016

Water assisted high proton conductance in a highly thermally stable and superior water-stable open-framework cobalt phosphate

Abstract

Proton-conducting materials show important technological applications as key components in energy conversion, electrochemical sensing and electrochromic devices; the exploration for new types of proton-conducting materials is crucial for the development of efficient electrochemical devices. In this study, we investigated the proton transport nature of an inorganic–organic hybrid crystal of open-framework cobalt phosphate, (C2N2H10)0.5CoPO4. The structure of the hybrid crystal consists of the [CoPO4] anionic framework, and the proton carriers, H2en2+ cations (en = ethylenediamine), are located in the pores to compensate the negative charges of the inorganic framework. The open-framework is thermally stable up to 653 K (380 °C) at least, and also shows superior water stability. The open-framework exhibits negligible conductance in an anhydrous environment even at 473 K; however, there is evident water-assisted proton conduction. The conductivity reaches 2.05 × 10−3 S cm−1 at 329 K and 98% RH. Such high proton conductivity can compete with numerous state-of-the-art MOFs/PCPs-based proton conductors, and this material has promising applications in diverse electrochemical devices.

Graphical abstract: Water assisted high proton conductance in a highly thermally stable and superior water-stable open-framework cobalt phosphate

Supplementary files

Article information

Article type
Paper
Submitted
28 Oct 2016
Accepted
14 Nov 2016
First published
14 Nov 2016

Dalton Trans., 2016,45, 19466-19472

Water assisted high proton conductance in a highly thermally stable and superior water-stable open-framework cobalt phosphate

M. Wang, H. Luo, S. Liu, Y. Zou, Z. Tian, L. Li, J. Liu and X. Ren, Dalton Trans., 2016, 45, 19466 DOI: 10.1039/C6DT04133G

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