A water-stable open-framework zirconium phosphate and its water-assisted high proton conductivity

A water stable proton-conducting material (NH 4 ) 5 [Zr 3 (OH) 3 F 6 (PO 4 ) 2 (HPO 4 )] ( ZrP ) was hydrothermally synthesized. The three-dimensional (3D) framework of ZrP is composed of ZrF 2 O 4 octahedra and H x PO 4 phosphate units forming 18-ring channels through sharing oxygen atoms. Ammonium...

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Bibliographic Details
Published in:CrystEngComm 2021-09, Vol.23 (35), p.693-697
Main Authors: Yu, Jing-Wei, Yu, Hai-Jiao, Yao, Zhi-Yuan, Li, Zi-Han, Ren, Qiu, Luo, Hong-Bin, Zou, Yang, Wang, Lifeng, Ren, Xiao-Ming
Format: Article
Language:English
Subjects:
Alternating current
Crystal structure
Crystallography
Crystals
Format
Oxygen atoms
Protons
Relative humidity
Zirconium
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Summary:A water stable proton-conducting material (NH 4 ) 5 [Zr 3 (OH) 3 F 6 (PO 4 ) 2 (HPO 4 )] ( ZrP ) was hydrothermally synthesized. The three-dimensional (3D) framework of ZrP is composed of ZrF 2 O 4 octahedra and H x PO 4 phosphate units forming 18-ring channels through sharing oxygen atoms. Ammonium cations charge balance the anionic framework. Alternating current (AC) impedance measurements on ZrP powder samples show that at 25-60 °C and 98% relative humidity (RH), the proton conductivity is around 10 −2 S cm −1 , and the activation energy ( E a ) is 0.33 eV. A water stable open-framework zirconium (iv) phosphate ( ZrP ) has a low anhydrous proton conductivity of 7.73 × 10 −7 S cm −1 at 220 °C, and a water assisted high proton conductivity of 4.41 × 10 −2 S cm −1 at 60 °C and 98% RH.
ISSN:1466-8033
1466-8033
DOI:10.1039/d1ce00852h