Residual Energy Harvesting from Light Transients Using Hematite as an Intrinsic Photocapacitor in a Symmetrical Cell

Leeuwen, Nicole S. van; Blom, Burgert; Xie, Mengying; Adamaki, Vana; Bowen, Chris; Araújo, Moisés A. de; Mascaro, Lúcia H.; Cameron, Petra J.; Marken, Frank

doi:10.1021/acsaem.7b00035

Cited by 5 publications

(3 citation statements)

References 32 publications

(55 reference statements)

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“…Further analysis was carried out under 1.23 V RHE applied potential showing the TA spectra for the surface-hydroxylated photoanodes (Figure a). We note that SH-2h presented a strong decay after 10 ms (already observed in literature), which reveals a lower carrier lifetime compared to that of SH-4h. The enhancement in charge carrier lifetime observed for thicker materials consequently provides more time for the charge to be collected and promote the chemical reaction at the oxide photoanode surface.…”

Section: Resultssupporting

confidence: 77%

Insights on Thickness-Dependent Charge Transfer Efficiency Modulated by Ultrasonic Treatment in Hematite Photoanodes

et al. 2021

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The comprehension of the solid−liquid interface associated with the poor charge carrier dynamic of hematite has prevented its commercial application as a photoanode in a photoelectrochemical cell. The development of a low-cost and scalable strategy to overcome such drawbacks is still being pursued by the scientific community. Here, a simple surface modification of hematite photoanode designed with different thicknesses was carried out by employing an ultrasonic treatment (UST) process. UST creates an inhomogeneous defect distribution based on the solid− liquid energetics. The thicker photoanodes (H-4h) showed that the mechanical process can contribute to removing unstable layers, creating favorable sites for oxygen evolution without compromise the solid−solid interface. The UST approach for H-2h has promoted surface states pinning and possibly increased the stress between hematite and FTO. The effects on thinner photoanodes (H-2h) can drastically create polarized states that enhance surface trapping states, reducing the photogenerated charge lifetime. The outcome findings reveal that the surface hydroxylation might be extremely dependent on the electrode thickness. This study indicates that the UST approach is an efficient tool to boost the performance of thicker photoanodes, as desired for practical applications. Thus, for thinner layers, the stress induced at the hematite−FTO interface can be aggravated by mechanical treatment overcoming the beneficial effects at the solid−liquid interface. In fact, hydroxylation conducted via the sonication process is highly recommended for designing thicker films.

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Section: Resultssupporting

confidence: 77%

Insights on Thickness-Dependent Charge Transfer Efficiency Modulated by Ultrasonic Treatment in Hematite Photoanodes

et al. 2021

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“…It has been shown (based on a simple diffusion-reaction model) that thin oxide films (TiO2 and Nb2O5) give photo-current transient data that are associated with initially "photocapacitive" and later on with "photo-reactive" behaviour. Both, photo-capacitive and photo-reactive behaviour, can be exploited in energy harvesting [68] and water splitting devices, respectively. A simplistic computational diffusion model is employed to explore charge carrier (holes and electrons) concentration gradients as they develop with time.…”

Section: Discussionmentioning

confidence: 99%

Contrasting transient photocurrent characteristics for thin films of vacuum-doped “grey” TiO2 and “grey” Nb2O5

Araújo

Gromboni

Marken

et al. 2018

Applied Catalysis B: Environmental

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“…The energy-harvesting technology could harvest the energy from natural or artificial environment and provide the power for electronic devices. − Many light sources have been used for lighting food in the refrigerator in supermarkets. It would be one of the most promising methods to reuse and harvest the light energies. − The harvested light energy could be stored and used for self-powered wireless temperature sensing in food cold storage without battery limitation compared with conventional WSN. To combine with the flexible electronic technology, the light-energy-harvested wireless temperature-sensing device could be easily made is of small size, low cost, and even easier to deploy in actual applications. − It is a suitable way to help ensure the food quality and safety in cold storage.…”

Section: Introductionmentioning

confidence: 99%

Light-Energy-Harvested Flexible Wireless Temperature-Sensing Patch for Food Cold Storage

Xiao

Cao

2021

ACS Appl. Electron. Mater.

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The conventional rigid and energy-limited battery-powered wireless sensor network (WSN) needs to be improved for continuously sensing temperature and guaranteeing food quality and safety in cold storage. This paper aims to propose and develop a light-energy-harvested flexible wireless temperature-sensing patch (LTSP) for food cold storage. The LTSP could provide sustainable light-energy-powered battery-free applications in low-light conditions. The flexible circuit of LTSP was fabricated by the photosensitive etching method with a polyimide (PI) film as the flexible substrate and copper (Cu) as the circuit. The light energy was harvested by two pieces of amorphous silicon solar cells and stored in a micro-supercapacitor by the power-management module. The LTSP is flexible and can be bent. The micro-supercapacitor of 1 mF was rapidly charged from 0 to 3 V after only about 47 s and the micro-supercapacitor of 10 mF took about 465 s under the light intensity of 2100 lux by the light-energy-harvesting module. The temperature of the packaged food was sensed and acquired by a wireless module. The temperature-sensing data and voltage status of the micro-supercapacitor could be displayed on a liquid crystal display (LCD) in real time or read by radiofrequency identification (RFID) or near-field communication (NFC) reader such as NFC-enabled smart phone or device via a frequency of 13.56 MHz. The LTSP worked well under a light intensity of 2100 lux. The temperature fluctuation could be acquired under the table grapes storage temperature of 0 °C. The proposed LTSP has potential applications in food cold storage in supermarkets with light-energy reuse and could provide insights into the development of sustainable food quality and safety.

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Residual Energy Harvesting from Light Transients Using Hematite as an Intrinsic Photocapacitor in a Symmetrical Cell

Cited by 5 publications

References 32 publications

Insights on Thickness-Dependent Charge Transfer Efficiency Modulated by Ultrasonic Treatment in Hematite Photoanodes

Insights on Thickness-Dependent Charge Transfer Efficiency Modulated by Ultrasonic Treatment in Hematite Photoanodes

Contrasting transient photocurrent characteristics for thin films of vacuum-doped “grey” TiO2 and “grey” Nb2O5

Light-Energy-Harvested Flexible Wireless Temperature-Sensing Patch for Food Cold Storage

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