Use of Pressurized Oxidation of Cu₂O as a Means of Improving the Performance of Redox Based Thermochemical Energy Storage Systems

DOI

10.2991/ahe.k.210202.002How to use a DOI?

Keywords

thermochemical energy storage, copper oxide, redox cycle, pressurized oxidation, thermogravimetric analysis

Abstract

CuO/Cu2O is a promising redox pair for thermochemical energy storage. This is primarily because of its suitable reaction temperature, high reaction enthalpy, high oxygen-carrying capacity, wide availability, and competitive cost. In this study, the influence of pressurized oxidation on a pure CuO/Cu2O-based thermochemical energy storage system is examined experimentally. Specifically, thermogravimetric analyses (TGA) and scanning electron microscopy (SEM) are employed to assess the reaction characteristics and morphology changes of pure CuO/Cu2O. According to the results, the oxidation of Cu2O (the rate-limiting step) is found to be faster and more complete under a pressure of 5.0-15.0 bar compared to the near-ambient pressure under 1.2 bar. Meanwhile, the tests of 20 redox cycles reveal that the reactivity of Cu2O can maintain 70-90%, but the agglomeration of particles is still present as a potential issue. The concept of pressurized oxidation is then applied to a utility-scale thermochemical energy storage plant in a case study. Based on the case study, the proposed storage plant can achieve a round-trip efficiency of about 41.0% and an energy storage density of nearly 500 kJ/kg under the oxidation pressure of 10.0 bar.

Copyright

© 2021, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Sike Wu
AU  - Cheng Zhou
AU  - Behdad Moghtaderi
PY  - 2021
DA  - 2021/02/04
TI  - Use of Pressurized Oxidation of Cu₂O as a Means of Improving the Performance of Redox Based Thermochemical Energy Storage Systems
BT  - Proceedings of the 14th International Renewable Energy Storage Conference 2020 (IRES 2020)
PB  - Atlantis Press
SP  - 5
EP  - 13
SN  - 2589-4943
UR  - https://doi.org/10.2991/ahe.k.210202.002
DO  - 10.2991/ahe.k.210202.002
ID  - Wu2021
ER  -