A photothermal-driven hydrovoltaic-pyroelectric hybrid system for efficient energy harvesting and self-powered disinfection

Abstract

Capturing energy from water phase transitions holds great promise in emerging energy technologies due to its green, sustainable, and abundant nature. However, effectively harvesting this energy remains challenging, largely due to the inherently slow evaporation of water. Here, we present a high-performance hybrid generator that efficiently extracts water-phase transition energy through a multiscale structural design. The system integrates an arched multifunctional film with a polarized PVDF layer, enabling simultaneous photothermal, hydrovoltaic, and pyroelectric energy harvesting. Under optimized conditions, the device achieves a photothermal evaporation rate of ∼1.53 kg m−2 h−1 with a conversion efficiency of ∼96% enabled by rational microcomponent regulation, which is ∼30% higher than its planar counterpart. The hydrovoltaic output reaches a VOC value of ∼1.13 V and an ISC value of ∼6.46 μA, delivering a power density of ∼611 μW m−2 that is 8.5-fold higher than previous designs under 1 sun illumination in seawater. The generator also yields a pyroelectric VOC value of ∼143 V and an ISC value of ∼694 nA, with a peak power density of ∼13.58 mW m−2. Notably, these electrical outputs surpass earlier reports by >80%, attributed to enhanced interfacial temperature oscillations driven by the arched geometry. This platform reliably powers small electronic devices and enables a self-driven electrocatalytic system for seawater disinfection, achieving sodium hypochlorite production by coupling the generator with commercial Pt electrodes. Our multiscale design offers new insights for developing self-sustaining energy systems capable of harvesting and converting water-based energy for practical applications.

Graphical abstract: A photothermal-driven hydrovoltaic-pyroelectric hybrid system for efficient energy harvesting and self-powered disinfection

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Article information

Article type
Communication
Submitted
30 Apr 2025
Accepted
10 Jul 2025
First published
14 Jul 2025
This article is Open Access
Creative Commons BY-NC license

Mater. Horiz., 2025, Advance Article

A photothermal-driven hydrovoltaic-pyroelectric hybrid system for efficient energy harvesting and self-powered disinfection

H. Cheng, H. K. Lee and H. Li, Mater. Horiz., 2025, Advance Article , DOI: 10.1039/D5MH00815H

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