Low-grade heat is ubiquitous and in enormous quantities, scattered but difficult to be recovered. Thermally regenerative electrochemical cycle (TREC) system is expected to be one of the technologies for efficient recovery of low-grade heat. However, due to the limited temperature coefficient and temperature difference, it is difficult to further improve the heat-to-electricity conversion performance of TREC system. Therefore, a TREC system with carbon cloth deposited copper metal as the negative electrode is proposed. By studying various factors (acid treatment, current density, and electrolyte concentration) for the deposition of copper metal on carbon cloth, suitable conditions for the preparation of carbon cloth deposited copper metal were determined. The electrode increases the electrode reaction contact area, reduces the electrical energy charged during the TREC system cycle, and increases the net output work of the system by 142% compared to the conventional copper sheet negative electrode system.