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Issue 11, 2019
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A bimetallic thermally regenerative ammonia-based battery for high power density and efficiently harvesting low-grade thermal energy

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Abstract

A bimetallic thermally regenerative ammonia-based battery (B-TRAB) using inexpensive materials efficiently converts low-grade thermal energy into electricity with high power density. Through thermal regeneration of the 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 discharge 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. The 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.

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

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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, 2019,7, 5991-6000

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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, 2019, 7, 5991
    DOI: 10.1039/C8TA10257K

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