Intensive turbulence eddy-induced piezoelectric polarization boosting photocatalytic hydrogen production in ZnO/NF

IF 7.5 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-10-10 DOI:10.1016/j.fuel.2025.137058

Changfei Huang , Zhuofan Deng , Cong Yuan , Meng Zhang , Xinlan Wang , Danhui Yang , Chengcheng Tian , Hualin Wang

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Abstract

Fluid eddy-induced piezoelectric effect has been extensively employed to boost photocatalysis. However, the dynamic fluid-induced stress distribution on porous support and the effect of variable surface shear stresses on catalytic activity remain unclear in a rotating fluid-driven piezo-photocatalytic process. Herein, the ZnO-supported porous nickel foam (NF) monolithic catalyst was successfully fabricated, where the interconnected pore network induced intensive turbulence eddies, leading to enhanced light absorption and accelerated mass transport during photocatalysis. Furthermore, the effects of piezoelectric polarization intensity and porosity on hydrogen production via photocatalytic water splitting were systematically investigated. The ZnO/NF particles (porosity: 40 PPI) under flow-field rotation achieved an optimal hydrogen evolution rate of 1.02 mmol·g⁻¹·h⁻¹, representing a 7.3-fold improvement compared to the non-porous conductive glass loaded ZnO (0.14 mmol·g⁻¹·h⁻¹). The computational fluid dynamics (CFD) simulation revealed that the dynamic pressure distribution increased with porosity, whereas the effective light absorption area exhibited an opposite trend, underscoring the role of piezoelectric polarization in enhancing photocatalytic hydrogen production. Additionally, for the scalable production of clean hydrogen, a hydro-cyclonic piezo-photocatalytic reactor for H₂ production was initially designed and assembled under laboratory conditions.

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强湍流涡流压电极化促进ZnO/NF光催化制氢

流体涡流压电效应已被广泛应用于光催化。然而，在旋转流体驱动的压电光催化过程中，多孔载体上的动态流体诱导应力分布以及可变表面剪切应力对催化活性的影响尚不清楚。本文成功制备了zno负载的多孔泡沫镍（NF）单片催化剂，其中相互连接的孔网络诱导强烈的湍流涡流，从而增强光催化过程中的光吸收和加速质量传递。此外，系统地研究了压电极化强度和孔隙率对光催化水裂解制氢的影响。在流场旋转条件下，ZnO/NF颗粒（孔隙率为40 PPI）的最佳析氢速率为1.02 mmol·g−1·h−1，比无孔导电玻璃负载ZnO （0.14 mmol·g−1·h−1）提高了7.3倍。计算流体动力学（CFD）模拟表明，动压分布随孔隙率的增加而增加，而有效光吸收面积则呈现相反的趋势，强调了压电极化对光催化制氢的促进作用。此外，为了大规模生产清洁氢气，在实验室条件下初步设计并组装了用于氢气生产的水力旋流压电光催化反应器。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.