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A bimetallic thermally-regenerative ammonia-based battery for high power density and efficiently harvesting low-grade thermal energy

Abstract

A bimetallic thermally-regenerative ammonia-based battery (B-TRAB) using inexpensive materials was a feasible method to efficiently convert low-grade thermal energy into electricity with high power density. Through thermal regeneration of anolyte, the B-TRAB system realized high-voltage discharge (1.38 V) with redox couples [Cu(II)/Cu and Zn(NH3)42+/Zn] and low-voltage charge (0.72 V) with [Zn(II)/Zn and Cu(NH3)42+/Cu]. Adding 2 M NH3 to the anolyte of a Cu/Zn-TRAB produced a peak discharging power density of 525 W m-2-electrode (120 W m-2-membrane), and the voltage (or current) and peak power could be doubled by connecting two cells in series (or parallel). In successive regeneration cycles, a maximum power density of 115 W m-2-electrode (26 W m-2-membrane) and a net energy density of 714 W h m-3 were produced at a constant current density of 100 A m-2. Power density was enhanced to 515 W m-2-electrode (118 W m-2-membrane) and maintained in successive cycles by adding acid to the regenerated catholytes, with a net energy density of 299 W h m-3 (discharged at a constant load of 12 Ω and charged at a constant current density of 100 A m-2). A thermal-electricity conversion efficiency of 0.95% (10.7% relative to the Carnot efficiency) was achieved.

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Publication details

The article was received on 25 Oct 2018, accepted on 03 Dec 2018 and first published on 05 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10257K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    A bimetallic thermally-regenerative ammonia-based battery for high power density and efficiently harvesting low-grade thermal energy

    W. Wang, H. Tian, G. Shu, D. Huo, F. Zhang and X. Zhu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA10257K

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