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RESEARCH ARTICLE
Contents Vol 74(5)

Structure and Facile Synthesis of Proton-Conducting [Fe(CN)6]3– Bridged Cd-Complex

Wei-Min Ding A , Yao Zhao A , Hong-Yu Zhang A and Feng-Ming Zhang https://orcid.org/0000-0002-2738-306X A B
+ Author Affiliations
- Author Affiliations

A Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, Harbin University of Science and Technology, No. 4, Linyuan Road, Harbin 150040, China.

B Corresponding author. Email: zhangfm80@163.com

Australian Journal of Chemistry 74(5) 357-361 https://doi.org/10.1071/CH20285
Submitted: 25 September 2020  Accepted: 11 March 2021   Published: 9 April 2021

Abstract

Proton-conducting materials are a key component of proton exchange membrane fuel cells (PEMFCs) and the advantage of clear structural information in crystal materials offers a pathway for the investigation of the proton-conducting mechanism and pathway. In this work, a new Cd2+ coordination polymer material (compound 1) with the formula {[Cd3(bipy)3(H2O)4][Fe(CN)6]2·2H2O·2(bipy)}n was successfully synthesized by a solution diffusion method and its proton conduction ability was further determined. Crystal structure analysis confirms the coordination of [Fe(CN)6]3–, 4,4′-bipyridine, and H2O molecules to Cd2+ in the three dimensional structure of compound 1. Also, we confirmed that compound 1 of 500–800 nm particle size could be synthesized on a large scale by a facile stirring method. Proton-conductivity analyses revealed that compound 1 shows a water-mediated proton conduction behaviour because the conductivity increased apparently with the increase of relative humidity. Further investigation shows that the highest proton-conductivity of 8.36 × 10−4 S cm−1 was observed at 60°C and 95 % relative humidity, and the mechanism analysis suggests a Vehicle mechanism exists in the proton conduction process of compound 1.

Keywords: coordination complex, proton conduction, large-scale synthesis, crystal structure.


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