Quantum catalysis-enhanced extract energy in qubit quantum battery

What physical mechanism enables quantum catalysis to boost quantum battery (QB) performance in open systems? We investigate an external-field-driven qubit QB coupled to a harmonic oscillator catalyst, revealing a key thermodynamic mechanism: the catalyst induces transient negative heat flow (J(t)<0, or energy backflow) into the battery. This backflow actively counters dephasing losses, rapidly pushing the qubit into non-passive states, and results in a drastic enhancement of extractable work (Ergotropy). Leveraging the quantum first law, we precisely quantify this causal link between negative heat flux and QB performance enhancement. Our work uncovers the fundamental role of transient thermodynamic backflow in quantum catalysis, offering a crucial blueprint for high-performance quantum energy storage devices.