Sustainable Aqueous Synthesis and Electrochemical Insights on High-Voltage Sodium Alluaudite Insertion Materials

Dwibedi, Debasmita and Baskar, Senthilkumar and Barpanda, Prabeer (2017) Sustainable Aqueous Synthesis and Electrochemical Insights on High-Voltage Sodium Alluaudite Insertion Materials. In: 232nd ECS Meeting, 1- 5 October 2017, National Harbor, pp. 337-342.

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Abstract

The scope of this work is to demonstrate various energy-savvy synthesis routes for alluaudite frameworked high-voltage sodium insertion hosts with generic formula Na(2)Na(1)M(1)M(2)2(XO4)3 (M = 3d metals; X= S/ P/ V/ W/ Mo). Here, we have explored two unconventional aqueous routes, namely Pechini and spray drying methods, for SO4-based alluaudites and solution combustion route PO4-based alluaudites. Using these sustainable routes, we could achieve the lowest ever synthesis temperature (ca. 200 °C) and the lowest synthesis duration (ca. 6 h) for sulfate class of alluaudites. Further, we have discovered a hitherto unknown electrochemically active NaCoFe2(PO4)3 phosphate alluaudite. The electrochemical analyses revealed a reversible (de)sodiation activity providing 80% of net theoretical capacity. Both sulphate and phosphate alluaudites delivered good rate capability and operational stability over 100 cycles maintaining a Coulombic efficiency of 98%.

Item Type:	Conference Paper
Publication:	ECS Transactions
Publisher:	Electrochemical Society Inc.
Additional Information:	The Copyright of this article belongs to the Electrochemical Society Inc.
Keywords:	Iron compounds; Sodium; Sulfur compounds; Coulombic efficiency; Electrochemical analysis; Insertion materials; Operational stability; Solution combustion; Synthesis durations; Synthesis temperatures; Theoretical capacity; Sodium compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	22 Jun 2022 04:41
Last Modified:	22 Jun 2022 04:41
URI:	https://eprints.iisc.ac.in/id/eprint/73488

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