Simultaneously Enhanced Energy Harvesting and Storage Performance Achieved by 3D Mix-Phase Mose₂-Nise/NF

As an energy harvesting device, the newly emerged thermocell has attracted great interest. However, it requires an additional energy storage device to complete a functional recycling system. As the core part of energy harvesting and storage devices, the design of electrodes with both high thermoelectric and electrochemical conversion efficiencies is particularly important. Herein, a high-performance thermocell and supercapacitor device are constructed by employing the same mix-phase MoSe₂-NiSe/NF electrode for both energy harvesting and storage. The thermocell exhibits an enhanced Seebeck coefficient of −1.69 mV K⁻¹ and a superior output of 0.58 mW m⁻² K⁻² for low-grade heat harvesting. Meanwhile, the supercapacitor device shows a great energy density of 54 Wh kg⁻¹ at a power density of 806 W kg⁻¹ and excellent cycling stability with a 92.8% retention rate after 50 000 cycles. This work offers a universal approach for the rational design of synergistic electrode materials to simultaneously achieve high-energy harvesting and storage devices and lays a foundation for the recycling system of thermoelectric harvesting, conversion, and storage.