CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xintao Xie,Yue Liu,Yipeng Zhang,Hongxiang Xie,Jianyong Ye,Hejun Li,Weifan Chen
Photovoltaic (PV) efficiency can be improved to some extent by using thermoelectric (TE) conversion cooling. However, PV performance has not reached its full potential due to excessive residual heat accumulation that is not dissipated in a timely manner during prolonged operation. In this work, we proposed a passive cooling system via a cooler with thermoelectric-driven convection and radiative cooling (CTCRC) attached to the PV backsheet, which efficiently and responsively harnessed thermoelectricity further to enhance PV efficiency. In this cooler, a radiative cooling (RC) film adhered to the thermoelectric generator was optimized to increase the TE voltage, thereby initiating thermoelectric-driven forced convection at a lower temperature threshold for the PV panel. At 1 kW m −2 solar irradiation, the TE/RC composite cooler achieves 331 W·m −2 cooling power under steady-state heat transfer conditions, reducing commercial PV panel temperature by 7.8 °C and improving PV efficiency by 11 %. Activating thermoelectric-driven forced convection further increases cooling power to 529 W·m −2 , lowering PV panel temperature by 11.3 °C and enhancing PV efficiency by 15.6 %. Simulations of temperature distribution confirm the energy transfer and conversion processes in the coolers. The CTCRC intensifies thermoelectricity with RC to facilitate responsive thermoelectric-driven forced convection at lower PV temperatures, offering a novel approach to improve PV efficiency further.
研究领域:
可再生能源
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热电技术
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太阳能
·
传热学
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材料科学
·
能量转换
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2025
·
IF 9.1
Yu Xia,Weiyuan Chen,Priscila Vensaus,Yiwei Sun,Yunchang Liang,Magalí Lingenfelder,Wenbo Ju
Magnetic-field enhancement of the oxygen evolution reaction (OER) represents a promising route toward more efficient alkaline water electrolyzers, yet its origin remains debated due to overlapping effects of mass transport and reaction kinetics. Here, we present a general experimental strategy that employs strong forced convection to suppress uncontrolled transport arising from natural diffusion and magnetohydrodynamic (MHD) flows. Using polycrystalline Au electrodes, we show that this approach resolves subtle OER variations under controlled flow and field conditions. Notably, spontaneous MHD flows near hard-magnetic electrodes are identified for the first time, highlighting a major complication in interpreting magnetic effects. Forced convection eliminates these artifacts, enabling reliable quantification of intrinsic activity changes. Systematic analysis of 3d transition-metal catalysts reveals a clear composition dependence: Fe-based catalysts exhibit the strongest magnetic enhancement, followed by Mn and Co, whereas Ni shows minimal response. Moreover, synergistic interactions between different elements further modulate the effect. By decoupling magnetic influences on mass transport from those on kinetics, this method provides a universal framework to assess how magnetic fields alter electrocatalysis.
研究领域:
电催化
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材料科学
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物理化学
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能源化学
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界面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Liu Wei,Lv Yang,Ou Honghui,Zhang Jiqiu,Ren Yuxi,Xia Mengyang,Li Yang,Li He,Ren Xiaoling,Hu Huagui,Yang Guidong
Plasma-electrochemical tandem conversion with NO x − as intermediates promises a route for renewable ammonia (NH 3 ) synthesis from air and water. However, a critical challenge lies in developing electrolyzers capable of operating efficiently at large current densities. Here, we present a scalable membrane electrode assembly electrolyzer with a full runner design (MEA-FR) that achieves efficient NH 3 production at industrial current densities. Compared to conventional serpentine runner configuration, MEA-FR leveraging forced convection within porous electrodes achieves three-order-of-magnitude enhancement in NO x − mass transfer flux. This design, meanwhile, generates strong shear forces across the porous electrode, promoting rapid detachment of O 2 bubbles at the anode and reducing overpotential losses. Notably, MEA-FR exhibits a high Faradaic efficiency of 91.8 ± 1.4% for NH 3 synthesis at 500 mA cm −2 , significantly outperforming the serpentine runner counterparts (64.9 ± 1.1%). Furthermore, a scaled-up 4 × 25 cm 2 MEA-FR stack with four modular cells is assembled with rotationally symmetric bipolar plates, delivering high NO x − conversion efficiency (>95%), high Faradaic efficiency (>91%), and long-term stability (>200 h) under industrial-relevant current densities.
研究领域:
电化学
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可再生能源
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氨合成
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化学工程
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材料科学
·
环境技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）