Electrical power production of thermally regenerative ammonia-based batteries using reduced graphene oxide modified Ni foam composite electrodes

Yu Shi, Yichao An, Zhiqiang Tang, Liang Zhang, Jun Li, Qian Fu, Xun Zhu and Qiang Liao

Applied Energy, 2022, vol. 326, issue C, No S0306261922012235

Abstract: Developing appropriate composite electrodes with a large surface area and stable structure for improving the performance of thermally regenerative ammonia-based batteries (TRABs) is extremely important. In this work, reduced graphene modified Cu/Ni composite electrodes (Cu-rGONF) are proposed for TRABs to increase power generation performance. It is demonstrated that this Cu-rGONF has a sizeable specific electrode area, porous surface and high conductivity, which are beneficial for the Cu2+ electrodeposition on the cathode and Cu stripping from the anode, thereby an improvement in the performance of TRAB. And for full batteries, the maximum power using Cu-rGONF is 8.9 mW, which is 52.8 % higher than that of TRAB with Cu/Ni composite electrodes. Moreover, the output energy density of TRAB with Cu-rGONF is 320 Wh/m−3(−|-); correspondingly, the thermal energy efficiency is 0.4 % (relative Carnot efficiency is 4.9 %). In addition, the maximum power density can be further improved to 13.3 mW by increasing the flow rates to 15 mL min−1 because of the enhancement of mass transfer. This indicates that Cu-rGONF is likely a suitable choice for optimizing TRABs.

Keywords: Thermally regenerative ammonia-based batteries; Reduced graphene oxide; Power generation; Low-grade waste heat recovery (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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DOI: 10.1016/j.apenergy.2022.119966

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