Fe<sub>2</sub>O<sub>3</sub>/BiOI-Based Photoanode with n-p Heterogeneous Structure for Photoelectric Conversion

Li, Ying; Sun, Weining; Yuan, Chunxue; Wang, Baoxin; Zhang, Wei; Song, Xi‐Ming

doi:10.1021/acs.langmuir.7b02969

Cited by 27 publications

(12 citation statements)

References 47 publications

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“…Transient photovoltage (TPV) was further used to determine charge carrier diffusion properties, which performed in a self-assembling parallelplate capacitor (details see Experimental section in SI). [37] As shown in Figure 4e, the positive response of BiOCl hydrogel film electrode corresponds to an n-type semiconductor, which is consistent with the result of Mott-Schottky test (Figure 3e). As illustrated in Figure 4e, two response peaks were observed at 2×10 -7 s and 1×10 -4 s. The peak located at 2×10 -7 s represents the charge drift process of built-in electric field along the surface, while the peak at 1×10 -4 s can be used to probe the process of charge diffusion between particles.…”

Section: Photocorrosion Gel Film Electrode Designsupporting

confidence: 86%

Smart Solar–Metal–Air Batteries Based on BiOCl Photocorrosion for Monolithic Solar Energy Conversion and Storage

Lan

Batmunkh

Qian

et al. 2021

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Solar energy generation and storage are two distinct processes and integrating them in a single device is of great challenge. Herein, BiOCl hydrogel film electrode featuring excellent photocorrosion and regeneration properties acts as the anode to construct a novel type of smart Solar-Metal-Air Batteries (SMABs), which combine the characteristics of solar cell (direct photovoltaic conversion) and metal-air battery (electric energy storage and release interacting with atmosphere). The cyclic photocorrosion processes between BiOCl (Bi 3+ ) and Bi can simply be achieved by solar light illuminating and standing in dark, corresponding to the charging and discharging processes of the battery, respectively. Upon illumination, the device takes open-circuit configuration to charge itself from the sunlight. Photogenerated electrons in the conduction band of BiOCl reduce Bi 3+ to Bi 0 following the photocorrosion process of BiOCl; and in the meantime, photogenerated positive charges (holes) initiate the oxygen evolution reaction to produce O2. Notably, in this system, the converted solar energy can be stored in the SMABs without the need of external batteries to store the electricity like those for the traditional solar cells. In the discharging process in the dark, Bi 0 spontaneously turns back to Bi 3+ producing electrons to induce oxygen reduction reaction occurring at the counter electrode (Pt/C) like metal-air battery. With an illumination of 15 min, the battery with an electrode area of 1 cm 2 can be continuously discharged for approximately 3,000 s, demonstrating a theoretical capacity of 384.75 mAh•g -1 , which is higher than the theoretical capacity of lithium-ion batteries (LiCoO2, 274 mAh•g -1 ). This novel type of SMABs is developed for the first time based on the unique photocorrosive and self-oxidation reaction of BiOCl to achieve photochemical energy generation and storage. The revealed fundamental mechanism and proposed device design create new solutions to the renewable energy harvesting and storage field. This class of solar light direct-charging battery is an effective step to fulfill the need for green and sustainable energy developments and exhibits great promise for the commercial market.

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Section: Photocorrosion Gel Film Electrode Designsupporting

confidence: 86%

Smart Solar–Metal–Air Batteries Based on BiOCl Photocorrosion for Monolithic Solar Energy Conversion and Storage

Lan

Batmunkh

Qian

et al. 2021

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“…The photogenerated electrons can easily travel from conduction band of BiVO 4 to that of WO 3 due to band alignment, and then transfer to the Pt counter electrode through FTO substrate. Meanwhile, the photogenerated holes from WO 3 will be injected to the valence band of BiVO 4 , and then reach to the Co-Pi OEC, catalyzing the water oxidation process with improved reaction kinetics owing to the efficient charge separation and transfer in heterojunction. , It should be mentioned that in the Co-Pi@BiVO 4 /WO 3 heterojunction photoanode, the light scattering/trapping effect of NPAs structure increases the light harvesting efficiency, and the as-formed type II BiVO 4 /WO 3 heterojunction with an intimate contact of thin conformal BiVO 4 layer on the surface of WO 3 NPAs enhances the charge carrier separation/transport ability at the WO 3 /BiVO 4 interface. More importantly, the decoration of Co-Pi OEC further improves the photostability of Co-Pi@BiVO 4 /WO 3 heterojunction photoanode and promotes the water oxidation kinetics.…”

Section: Results and Discussionmentioning

confidence: 99%

Conformal BiVO₄-Layer/WO₃-Nanoplate-Array Heterojunction Photoanode Modified with Cobalt Phosphate Cocatalyst for Significantly Enhanced Photoelectrochemical Performances

Zhang

Wang

et al. 2018

ACS Appl. Mater. Interfaces

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Constructing semiconductor heterojunctions via surface/interface engineering is an effective way to enhance the charge carrier separation/transport ability and thus the photoelectrochemical (PEC) properties of a photoelectrode. Herein, we report a conformal BiVO-layer/WO-nanoplate-array heterojunction photoanode modified with cobalt phosphate (Co-Pi) as oxygen evolution cocatalyst (OEC) for significant enhancement in PEC performances. The BiVO/WO nanocomposite is fabricated by coating a thin conformal BiVO layer on the surface of presynthesized WO nanoplate arrays (NPAs) via stepwise spin-coating, and the decoration of Co-Pi OEC is realized by photoassisted electrodeposition method. The optimized Co-Pi@BiVO/WO heterojunction photoanode shows a maximum photocurrent of 1.8 mA/cm at 1.23 V vs RHE in a phosphate buffer electrolyte under an AM1.5G solar simulator, which is 5 and 12 times higher than those of bare WO and BiVO photoanode, respectively. Measurements of UV-vis absorption spectra, electrochemical impedance spectra (EIS) and photoluminescence (PL) spectra reveal that the enhanced PEC performances can be attributed to the increased charge carrier separation/transport benefited from the type II nature of BiVO/WO heterojunction and the promoted water oxidation kinetics and photostability owing to the decoration of Co-Pi cocatalyst.

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“…It is interesting to note that this oxyhalide semiconductor also has an environmentally benign character [10]. The wider application of BiOI can extend for a photoanode used in photoelectrochemical devices [11][12][13][14][15][16][17]. Several ways are common to synthesize BiOI, either including the solvent usage or solvent-less process [5,11,16,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Study of Annealing Temperature Effect on the Photovoltaic Performance of BiOI-Based Materials

et al. 2019

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Bismuth oxyiodide (BiOI) is expected to be promising material for photovoltaic devices since it has good activity under the visible range. Here, we studied the annealing treatment on BiOI and its effect on the photovoltaic application. Firstly, the synthesized BiOI from Bi(NO3)3 and KI was annealed at varied temperatures (100–550 °C). The structural investigation by X-ray diffraction and Raman spectroscopy analysis was supported with morphology and optical analysis by scanning electron microscope (SEM) and UV-Visible spectroscopy. Due to the heating treatment, it could result in iodine-deficient bismuth-based materials, namely Bi7O9I3, Bi5O7I, and β-Bi2O3. Secondly, the photovoltaic test measurement was performed by solar simulator air mass (AM) 1.5 illumination which presented the current-voltage curve from each material. The enhancement of photovoltaic performance was given by the increase of temperature up to 300 °C. At that temperature, the performance of the device which consisted of Bi7O9I3 achieved three times higher efficiency than the annealed parent BiOI at 100 °C. Hence, the structural changing owing to the oxygen addition to BiOI structure had an impact on the photoelectrochemical cell. Based on this work, it is possible to attempt BiOI derivation with suitable holes and electron transport layers for better photovoltaic performance.

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Fe₂O₃/BiOI-Based Photoanode with n-p Heterogeneous Structure for Photoelectric Conversion

Cited by 27 publications

References 47 publications

Smart Solar–Metal–Air Batteries Based on BiOCl Photocorrosion for Monolithic Solar Energy Conversion and Storage

Smart Solar–Metal–Air Batteries Based on BiOCl Photocorrosion for Monolithic Solar Energy Conversion and Storage

Conformal BiVO₄-Layer/WO₃-Nanoplate-Array Heterojunction Photoanode Modified with Cobalt Phosphate Cocatalyst for Significantly Enhanced Photoelectrochemical Performances

Study of Annealing Temperature Effect on the Photovoltaic Performance of BiOI-Based Materials

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Fe2O3/BiOI-Based Photoanode with n-p Heterogeneous Structure for Photoelectric Conversion

Cited by 27 publications

References 47 publications

Smart Solar–Metal–Air Batteries Based on BiOCl Photocorrosion for Monolithic Solar Energy Conversion and Storage

Smart Solar–Metal–Air Batteries Based on BiOCl Photocorrosion for Monolithic Solar Energy Conversion and Storage

Conformal BiVO4-Layer/WO3-Nanoplate-Array Heterojunction Photoanode Modified with Cobalt Phosphate Cocatalyst for Significantly Enhanced Photoelectrochemical Performances

Study of Annealing Temperature Effect on the Photovoltaic Performance of BiOI-Based Materials

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Fe₂O₃/BiOI-Based Photoanode with n-p Heterogeneous Structure for Photoelectric Conversion

Conformal BiVO₄-Layer/WO₃-Nanoplate-Array Heterojunction Photoanode Modified with Cobalt Phosphate Cocatalyst for Significantly Enhanced Photoelectrochemical Performances