Direct storage of holes in ultrathin Ni(OH)2 on Fe2O3 photoelectrodes for integrated solar charging battery-type supercapacitors

Zhu, Kaijian; Zhu, Guoxiang; Wang, Jun; Zhu, Jixin; Sun, Gengzhi; Zhang, Yao; Li, Ping; Zhu, Yongfa; Luo, Wenjun; Zou, Zhigang; Huang, Wei

doi:10.1039/c8ta08384c

Cited by 51 publications

(51 citation statements)

References 33 publications

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“…The photocurrent decays quickly and negligible steady photocurrent is obtained at all selected potentials. According to previous studies (Wang et al, 2013;Zhu et al, 2018), the transient photocurrent comes from Ni(OH) 2 oxidation and the photocurrent will disappear once all of Ni(OH) 2 is oxidized into NiOOH. The steady photocurrent comes from water oxidation.…”

Section: Resultsmentioning

confidence: 88%

“…Therefore, Faradaic layers are more ideal than non-Faradaic layers for high-efficiency solar water-splitting cells. However, other reports suggested that the coating of Faradaic layers on semiconductor photoanodes decreased the performance of solar water splitting (Wang et al, 2013;Lim et al, 2017;Zhu et al, 2018). Since both the semiconductors and the Faradaic layers are the same (Liu et al, 2016;Young and Hamann, 2014;Steier et al, 2015), the inconsistent results in previous studies possibly originate from uncontrollable interface structures between semiconductors and Faradaic layers.…”

Section: Introductionmentioning

confidence: 96%

“…Moreover, some Faradaic layers, including Ni(OH) 2 (Zhu et al, 2018;Xia et al, 2012;Wang et al, 2014) and PbO x (Safshekan et al, 2017), have also been directly coated on the surface of semiconductors as photo charging supercapacitors for solar conversion and storage. In these devices, electron-hole pairs are generated in semiconductors under irradiation, which are injected into the Faradaic layers to be stored.…”

Section: Introductionmentioning

confidence: 99%

“…In conventional supercapacitors, Faradaic layers on conductive substrates can be charged completely in dark. However, in solar charging supercapacitors, only a little part of Faradaic layers are photo-charged on semiconductors, which leads to much lower specific capacitances in solar charging supercapacitors than conventional supercapacitors (Zhu et al, 2018;Xia et al, 2012;Sekhar et al, 2017;Chang et al, 2014). It is not clear whether the charging processes on semiconductors are different from those on conductive substrates or not.…”

Section: Introductionmentioning

confidence: 99%

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Reversible Charge Transfer and Adjustable Potential Window in Semiconductor/Faradaic Layer/Liquid Junctions

et al. 2020

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Semiconductor/Faradaic layer/liquid junctions have been widely used in solar energy conversion and storage devices. However, the charge transfer mechanism of these junctions is still unclear, which leads to inconsistent results and low performance of these devices in previous studies. Herein, by using Fe 2 O 3 and Ni(OH) 2 as models, we precisely control the interface structure between the semiconductor and the Faradaic layer and investigate the charge transfer mechanism in the semiconductor/ Faradaic layer/liquid junction. The results suggest that the short circuit severely restricts the performance of the junction for both solar water splitting cells and solar charging supercapacitors. More importantly, we also find that the charge-discharge potential window of a Faradaic material sensitively depends on the energy band positions of a semiconductor, which provides a new way to adjust the potential window of a Faradaic material. These new insights offer guidance to design high-performance devices for solar energy conversion and storage.

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Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reversible Charge Transfer and Adjustable Potential Window in Semiconductor/Faradaic Layer/Liquid Junctions

et al. 2020

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“…[ 65 ] Compared with TiO 2 , the higher VB of Fe 2 O 3 with thicker Ni(OH) 2 was demonstrated to effectively inhibit water oxidation. [ 66 ] After inhibiting water oxidation, the Fe 2 O 3 @ Ni(OH) 2 based photocapacitors exhibited a specific capacitance of 20.6 mF cm −2 at a discharge current density of 0.1 mA cm −2 .…”

Section: Photorechargeable Supercapacitorsmentioning

confidence: 99%

Integrated Photorechargeable Energy Storage System: Next‐Generation Power Source Driving the Future

Zeng

Lai

Jiang³

et al. 2020

Advanced Energy Materials

163

122

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Solar energy is one of the most abundant renewable energy sources. For efficient utilization of solar energy, photovoltaic technology is regarded as the most important source. However, due to the intermittent and unstable characteristics of solar radiation, photoelectric conversion (PC) devices fail to meet the requirements of continuous power output. With the development of rechargeable electric energy storage systems (ESSs) (e.g., supercapacitors and batteries), the integration of a PC device and a rechargeable ESS has become a promising approach to solving this problem. The so‐called integrated photorechargeable ESSs which can directly store sunlight generated electricity in daylight and reversibly release it at night time, has a huge potential for future applications. This review summarizes the development of several types of mainstream integrated photorechargeable ESSs and introduces different working mechanisms for each photorechargeable ESS in detail. Several general perspectives on challenges and future development in the field are also provided.

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High‐Energy‐Density Supercapacitors Based on High‐Areal‐Specific‐Capacity Ti₃C₂T_x and a Redox‐Active Organic‐Molecule Hybrid Electrode

Zhang

Wang

Xing

et al. 2022

Adv Funct Materials

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Photorechargeable supercapacitors are perfect energy storage devices, particularly for solar cells that output electricity only during sunshine hours. The lower energy density of supercapacitors is due to fewer redox‐active sites, poor electrolyte accessibility at the electrodes, and charge loss during charge transfer from solar cells to the supercapacitor. Here, an electrolyte‐accessible organic–inorganic hybrid electrode with synergistic pseudocapacitance of Ti3C2Tx and high theoretical specific capacity CO active centers to enhance the energy density of the supercapacitor is proposed. Density functional theory (DFT) calculations show that the covalent cross‐linking of organic molecules changes the charge density redistribution of Ti3C2Tx, enhances ion absorption and storage, and increases the energy density of the supercapacitors. Based on these DFT calculation results, hybrid electrodes are successfully prepared using p‐phenylene diisocyanate to covalently cross‐link pseudocapacitors Ti3C2Tx with anthraquinone such as 1‐hydroxyanthraquinone (HA) or 1‐amino‐4‐bromoanthraquinone‐2‐sodium sulfonate (ABS). The Ti3C2Tx‐HA hybrid electrodes exhibit high areal specific capacity (2532.5 mF cm−2), excellent ion absorption storage capability, and long‐term stability. The asymmetric supercapacitor yields a decent area specific capacity (1686.72 mF cm−2 at 0.25 mA cm−2) and energy density (599.72 mWh cm−2 at a power density of 200 mW cm−2). These high‐energy‐density supercapacitors are coupled with perovskite solar cells to prepare photorechargeable supercapacitors with fast energy storage.

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Direct storage of holes in ultrathin Ni(OH)₂ on Fe₂O₃ photoelectrodes for integrated solar charging battery-type supercapacitors

Abstract: A water oxidation side reaction on a photoelectrochemical charging supercapacitor is completely suppressed by controlling the thickness of a capacitive material.

Cited by 51 publications

References 33 publications

Reversible Charge Transfer and Adjustable Potential Window in Semiconductor/Faradaic Layer/Liquid Junctions

Reversible Charge Transfer and Adjustable Potential Window in Semiconductor/Faradaic Layer/Liquid Junctions

Integrated Photorechargeable Energy Storage System: Next‐Generation Power Source Driving the Future

High‐Energy‐Density Supercapacitors Based on High‐Areal‐Specific‐Capacity Ti₃C₂T_x and a Redox‐Active Organic‐Molecule Hybrid Electrode

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Direct storage of holes in ultrathin Ni(OH)2 on Fe2O3 photoelectrodes for integrated solar charging battery-type supercapacitors

Abstract: A water oxidation side reaction on a photoelectrochemical charging supercapacitor is completely suppressed by controlling the thickness of a capacitive material.

Cited by 51 publications

References 33 publications

Reversible Charge Transfer and Adjustable Potential Window in Semiconductor/Faradaic Layer/Liquid Junctions

Reversible Charge Transfer and Adjustable Potential Window in Semiconductor/Faradaic Layer/Liquid Junctions

Integrated Photorechargeable Energy Storage System: Next‐Generation Power Source Driving the Future

High‐Energy‐Density Supercapacitors Based on High‐Areal‐Specific‐Capacity Ti3C2Tx and a Redox‐Active Organic‐Molecule Hybrid Electrode

Contact Info

Product

Resources

About

Direct storage of holes in ultrathin Ni(OH)₂ on Fe₂O₃ photoelectrodes for integrated solar charging battery-type supercapacitors

High‐Energy‐Density Supercapacitors Based on High‐Areal‐Specific‐Capacity Ti₃C₂T_x and a Redox‐Active Organic‐Molecule Hybrid Electrode