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A sustainable light-chargeable two-electrode energy storage system based on aqueous sodium-ion photo-intercalation
Sustainable Energy & Fuels ( IF 5.6 ) Pub Date : 2020-07-20 , DOI: 10.1039/d0se00628a
Zhuoran Wang 1, 2, 3, 4 , Hsien-Chieh Chiu 1, 2, 3, 4 , Andrea Paolella 4, 5, 6, 7 , Raynald Gauvin 1, 2, 3, 4 , Karim Zaghib 4, 5, 6, 7 , George P. Demopoulos 1, 2, 3, 4
Affiliation  

Direct photo-to-chemical energy conversion realized through photocatalysis could provide the ultimate solution to the intermittency problem of solar energy. Among different designs of photocatalytic solar energy storage systems, the two-electrode system offers the simplest configuration for enabling highly integrated solar energy conversion and storage in one electrode and on-demand electrocatalytic discharge in the other. In this study, a novel type of visible light chargeable two-electrode Na-ion energy storage system has been developed, to the best of our knowledge, for the first time. It consists of a WO3–(TiO2)–CdS photo absorbing, energy storing bi-functional electrode, a Pt foil counter electrode, and a sacrificial hole scavenging electrolyte. This device delivered a discharge capacity of 12.3 μA h cm−2 (or 18.1 mA h g−1) after 10 min light charging without exhibiting signs of photo/chemical corrosion on the chalcogenide sensitizer. Further by controlling the working voltage window, structure distortion due to overcharging was avoided, thereby leading to an improvement of cyclability (discharge capacity retention after 5 working cycles) from 36% to 64%, and this was eventually elevated to ∼90% upon optimizing the discharging rate. A stable overall solar-to-electrical energy efficiency of ∼0.3% has been achieved for the system. Moreover, a modified photo-rechargeable two-electrode system was developed by replacing the sacrificial hole scavenger and Pt with polysulfide aqueous electrolyte and Cu2S electrocatalytic electrode, respectively. In this way the issue of non-regenerable hole scavenger consumption and instability of Pt in sulfide electrolyte was resolved, establishing a new design, highly promising towards the development of an all-sustainable photo-rechargeable system.

中文翻译:

基于水钠离子光嵌入的可持续充电式两电极储能系统

通过光催化实现的直接光化学能转换可以为太阳能的间歇性问题提供最终解决方案。在不同设计的光催化太阳能存储系统中,双电极系统提供了最简单的配置,以实现高度集成的太阳能转换和一个电极的存储以及另一电极的按需电催化放电。在这项研究中,就我们所知,这是首次开发出一种新型的可充电可见光两电极Na离子储能系统。它由WO 3 –(TiO 2)– CdS光吸收,能量存储双功能电极,Pt箔对电极和牺牲空穴清除电解质。该设备的放电容量为12.3μAh cm -2(或18.1 mA hg -1)充电10分钟后,在硫属化物敏化剂上未显示出光/化学腐蚀迹象。此外,通过控制工作电压窗口,避免了由于过度充电引起的结构变形,从而将可循环性(5个工作循环后的放电容量保持率)从36%提高到64%,并在优化后最终提高到〜90%放电率。该系统已达到约0.3%的稳定总体太阳能发电效率。此外,通过用多硫化物水溶液电解质和Cu 2代替牺牲空穴清除剂和Pt,开发了改进的可充电双电极系统。S分别为电催化电极。这样就解决了不可再生空穴清除剂的消耗和硫化物电解质中Pt的不稳定性问题,从而建立了新的设计,这对开发一种全可持续的光充电系统很有希望。
更新日期:2020-08-25
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