A TOC- and deposition-free electrochromic window driven by redox flow battery

IF 9.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Chinese Chemical Letters Pub Date : 2024-08-23 DOI:10.1016/j.cclet.2024.110355

Jinlong Li , Ruixin Li , Jiahui Liu , Ji-Quan Liu , Jia Xu , Xianglin Zhou , Yefan Zhang , Kairui Wang , Lin Lei , Gang Xie , Fengmei Wang , Ying Yang , Liping Cao

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Abstract

Under “green architecture” principles, electrochromic smart windows are employed to adjust optical transmittance and indoor temperature, yet their high costs limit the wide application. Here, an electrochromic window is driven by a redox flow battery (RFB), where TOC and deposition layers are no longer needed. The transmittance of the electrochromic window is modulated by the state of oxidation (SOC) of aqueous posolyte Fe(phen)₃Cl₂, which is coupled with BTMAP-Vi negolyte in RFB. Under optimized conditions, average CE, VE, and EE reach 93.25 %, 92.61 %, and 86.35 % for RFB with a capacity fading rate of 1.57 % per cycle. 88.66 % optical modulation and 9.36 cm²/C coloration efficiency are achieved in the electrochromic process, and 72.34 % optical modulation is maintained after 12000 s. Essentially, the indoor temperature declines 3 °C for posolyte with 100 % SOC when compared with the control experiment using circulating water for a model house. This means minimum electricity of 0.0185 kWh is saved when using an air conditioner to cool a 100 m³ house, which corresponds to declined CO₂ emission (COE) of 0.0185 kg. This work provides a novel and cost-efficient strategy for modulating indoor comfort via electrochromic windows driven by RFB.

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氧化还原液流电池驱动的无 TOC 和沉积物电致变色窗

在 "绿色建筑 "原则下，电致变色智能窗被用来调节光学透射率和室内温度，但其高昂的成本限制了其广泛应用。在这里，电致变色窗由氧化还原液流电池（RFB）驱动，不再需要TOC和沉积层。电致变色窗口的透射率受水性正溶液 Fe(phen)3Cl2 的氧化状态 (SOC) 调节，而正溶液与 BTMAP-Vi 负溶液在 RFB 中耦合。在优化条件下，RFB 的平均 CE、VE 和 EE 分别达到 93.25%、92.61% 和 86.35%，容量衰减率为每周期 1.57%。电致变色过程中实现了 88.66 % 的光学调制和 9.36 cm2/C 的着色效率，并且在 12000 秒后仍能保持 72.34 % 的光学调制。与使用循环水的样板房对照实验相比，100 % SOC 的正多晶硅室内温度基本上下降了 3 °C。这意味着使用空调冷却 100 立方米的房屋可节省 0.0185 千瓦时的电量，相当于减少 0.0185 千克的二氧化碳排放量（COE）。这项研究为通过射频波驱动电致变色窗调节室内舒适度提供了一种新颖且具有成本效益的策略。

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来源期刊

Chinese Chemical Letters 化学-化学综合

CiteScore

14.10

自引率

15.40%

发文量

8969

审稿时长

1.6 months

期刊介绍： Chinese Chemical Letters (CCL) (ISSN 1001-8417) was founded in July 1990. The journal publishes preliminary accounts in the whole field of chemistry, including inorganic chemistry, organic chemistry, analytical chemistry, physical chemistry, polymer chemistry, applied chemistry, etc.Chinese Chemical Letters does not accept articles previously published or scheduled to be published. To verify originality, your article may be checked by the originality detection service CrossCheck.