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Solid and acid electrolytes for Al-air batteries based on xanthan-HCl hydrogels

Solid and acid electrolytes for Al-air batteries based on xanthan-HCl hydrogels This paper presents first investigations on solid and strongly acid electrolytes for Al-air batteries. These electrolytes are prepared starting from a “green” polysaccharide (xanthan gum) and HCl solutions (between 4 and 24 wt%). The gelling capability of xanthan is used to obtain real solid products characterized by ionic conductivities of practical interest (10−2 S cm−1) in electrochemical cells. The adsorption properties of xanthan on metal Al are exploited to control anode self-corrosion and realize Al-air cells with very high anodic efficiencies (> 80%). The behavior of Al-air cells is studied utilizing the weight loss technique, electrochemical impedance spectroscopy, potentiodynamic polarization curves, scanning electron microscopy coupled to energy-dispersive spectroscopy, and discharge tests at constant current (1–5 mA) with Pt/C-based air cathodes. The best overall performance is observed with electrolytes prepared starting from HCl at 24% and gel solid/liquid ratio of 1.40 g ml−1. The hydrogels obtained in this work permit for the first time the operation of an Al-air galvanic cell based on solid and strongly acid electrolytes with high anodic efficiency and limited dendrite formation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Solid State Electrochemistry Springer Journals

Solid and acid electrolytes for Al-air batteries based on xanthan-HCl hydrogels

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Chemistry; Physical Chemistry; Electrochemistry; Energy Storage; Characterization and Evaluation of Materials; Analytical Chemistry; Condensed Matter Physics
ISSN
1432-8488
eISSN
1433-0768
DOI
10.1007/s10008-018-4003-2
Publisher site
See Article on Publisher Site

Abstract

This paper presents first investigations on solid and strongly acid electrolytes for Al-air batteries. These electrolytes are prepared starting from a “green” polysaccharide (xanthan gum) and HCl solutions (between 4 and 24 wt%). The gelling capability of xanthan is used to obtain real solid products characterized by ionic conductivities of practical interest (10−2 S cm−1) in electrochemical cells. The adsorption properties of xanthan on metal Al are exploited to control anode self-corrosion and realize Al-air cells with very high anodic efficiencies (> 80%). The behavior of Al-air cells is studied utilizing the weight loss technique, electrochemical impedance spectroscopy, potentiodynamic polarization curves, scanning electron microscopy coupled to energy-dispersive spectroscopy, and discharge tests at constant current (1–5 mA) with Pt/C-based air cathodes. The best overall performance is observed with electrolytes prepared starting from HCl at 24% and gel solid/liquid ratio of 1.40 g ml−1. The hydrogels obtained in this work permit for the first time the operation of an Al-air galvanic cell based on solid and strongly acid electrolytes with high anodic efficiency and limited dendrite formation.

Journal

Journal of Solid State Electrochemistry – Springer Journals

Published: Jun 2, 2018

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