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Piezo as energy donor, tribo as catalyst: The true mechanism of flow-activated polyvinylidene fluoride-activated carbon-sodium chloride catalyst
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DOI：10.1016/j.nanoen.2026.111990.png)
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Abstract
En 中文
Piezoelectric materials offer self-powered redox platforms in water, but their mechanisms remain unclear. We demonstrate that synergy between the piezoelectric effect and triboelectrification via solid-liquid contact electrification (SL-CE) reduces effective Gibbs free energy (Delta G*) and promotes high-energy reactive oxygen species (ROS) pathways thermodynamically favorable. We fabricated a bucket-shaped poly(vinylidene fluoride)/activated carbon/NaCl composite that converts hydrodynamic stress into an open-circuit potential up to 4.10 V (vs NHE). By integrating CFD-resolved pressure fields, electrochemical measurements, radical scavenging, and thermodynamic analysis, we interpreted the coexisting electrification modes. SL-CE emerges as a thermodynamic catalyst: a streaming voltage that scales with interfacial zeta potential and pressure drop lowers effective freeenergy barriers by as much as 174 kJ center dot mol- 1 and contributes up to 44% of the total thermodynamic enhancement at high flow. Piezoelectric polarization acts as an energy donor that supplies the remaining potential required to activate the high-energy H2O ->& sdot;OH route, pushing all major ROS pathways into the strongly exergonic regime (Delta G* down to -125.4 kJ center dot mol- 1). These conditions enabled oxidative degradation, achieving 0.997 (C/C0) degradation of 30 mg center dot L- 1 tetracycline within 60 min at 0.640 m center dot s- 1. This work reframes flow-driven piezocatalysts as piezo-enhanced SL-CE catalysts, offering quantitative design principles for self-powered oxidative remediation.
Keywords:
Piezoelectricity
Triboelectrification
Solid-liquid contact electrification
Thermodynamics calculation
Reactive oxygen species
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17.1
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1.1W
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13.0W
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