ChemInform Abstract: Thermal Stability and Phase Transformations in CuBi<sub>2</sub>O<sub>4</sub>.

Klyndyuk, A. I.; Petrov, G. S.; Bashkirov, L. A.; Akimov, A. I.; Poluyan, A. F.

doi:10.1002/chin.199927026

Cited by 6 publications

(14 citation statements)

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“…The lattice parameters of the CuBi 2 O 4 film were calculated using the highest intensity peaks in the XRD diffractogram at 20.91 and 28.07°, corresponding to the (200) and (211) indices, respectively. The parameters are found to be a = b = 8.499 Å and c = 5.803 Å, which is in close agreement with other reports in the literature. − Using these parameters the bulk density of the CuBi 2 O 4 films is 8.645 g/cm 3 . The CuBi 2 O 4 crystal structure is shown in Figure .…”

Section: Resultssupporting

confidence: 86%

“…The mineral name for CuBi 2 O 4 is kusachiite. It has been reported to have a tetragonal crystal structure with space group P 4/ ncc , a = b = 8.500–8.511 Å, c = 5.814–5.823 Å, Z = 4. − To determine the crystal structure of our CuBi 2 O 4 photocathodes we measured them by X-ray diffraction (XRD). Figure shows the XRD diffractogram for a CuBi 2 O 4 photocathode synthesized by drop-casting on a fluorine-doped tin oxide (FTO) coated glass substrate followed by annealing at 450 °C.…”

Section: Resultsmentioning

confidence: 99%

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Comprehensive Evaluation of CuBi₂O₄ as a Photocathode Material for Photoelectrochemical Water Splitting

et al. 2016

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CuBi2O4 is a multinary p-type semiconductor that has recently been identified as a promising photocathode material for photoelectrochemical (PEC) water splitting. It has an optimal bandgap energy (∼1.8 eV) and an exceptionally positive photocurrent onset potential (>1 V vs RHE), making it an ideal candidate for the top absorber in a dual absorber PEC device. However, photocathodes made from CuBi2O4 have not yet demonstrated high photoconversion efficiencies, and the factors that limit the efficiency have not yet been fully identified. In this work we characterize CuBi2O4 photocathodes synthesized by a straightforward drop-casting procedure and for the first time report many of the quintessential material properties that are relevant to PEC water splitting. Our results provide important insights into the limitations of CuBi2O4 in regards to optical absorption, charge carrier transport, reaction kinetics, and stability. This information will be valuable in future work to optimize CuBi2O4 as a PEC material. In addition, we report new benchmark photocurrent density and IPCE values for CuBi2O4 photocathodes.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Comprehensive Evaluation of CuBi₂O₄ as a Photocathode Material for Photoelectrochemical Water Splitting

et al. 2016

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“…This is attributed to the current-doubling effect of the H 2 O 2 electron scavenger. [23] It was also found that the acceptor density (N A ) of ≈3 × 10 18 cm −3 calculated from Equation (1) using the slope of the Mott-Schottky plots and the reported dielectric constant (ε = 80) of CBO, [49] their flat band potential, and acceptor density were similar to that of previous report on CBO polycrystalline thin films. [23] It suggests that the crystallinity difference between the CBO polycrystalline thin film and the CBO single-crystal thin film photocathode rarely influence the intrinsic p-type semiconducting properties of CBO…”

Section: Resultssupporting

confidence: 83%

Template Engineering of CuBi₂O₄ Single‐Crystal Thin Film Photocathodes

Lee

Yoon

Choi

et al. 2020

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photoconversion of semiconducting photoelectrodes in photo-electrochemical (PEC) water-splitting, it is necessary to synthesize high-quality single-crystal thin films. [1-7] High-crystalline oxide thin films provide an ideal platform to enhance photoconversion efficiency using various strategies such as ferroelectric oxide domain engineering and interfacial engineering. [3-7] For example, the interlayer insertion of atomically sharp polar LaAlO 3 lowered the charge transfer resistance between the WO 3 photoanode and the Nb:SrTiO 3 substrate. [6] Furthermore, crystal facet engineering, which controls the preferred crystallographic orientation, has become an emerging approach to enhance the photocurrent or photostability in oxidebased photoelectrodes such as TiO 2 , BiVO 4 , and Cu 2 O thin films. [8-12] Therefore, the synthesis of single-crystal oxide thin film photoelectrodes is significantly important for the development of photoelectrodes toward efficient PEC water-splitting. While the investigation of single-crystal thin film photoanodes such as TiO 2 and BiVO 4 are relatively focused, [13-15] there are few studies for single-crystal thin film photocathodes such as copper-based oxides. One of the major challenges facing To develop strategies for efficient photo-electrochemical water-splitting, it is important to understand the fundamental properties of oxide photoelectrodes by synthesizing and investigating their single-crystal thin films. However, it is challenging to synthesize high-quality single-crystal thin films from copperbased oxide photoelectrodes due to the occurrence of significant defects such as copper or oxygen vacancies and grains. Here, the CuBi 2 O 4 (CBO) single-crystal thin film photocathode is achieved using a NiO template layer grown on singlecrystal SrTiO 3 (STO) (001) substrate via pulsed laser deposition. The NiO template layer plays a role as a buffer layer of large lattice mismatch between CBO and STO (001) substrate through domain-matching epitaxy, and forms a type-II band alignment with CBO, which prohibits the transfer of photogenerated electrons toward bottom electrode. The photocurrent densities of the CBO single-crystal thin film photocathode demonstrate −0.4 and −0.7 mA cm −2 at even 0 V RHE with no severe dark current under illumination in a 0.1 m potassium phosphate buffer solution without and with H 2 O 2 as an electron scavenger, respectively. The successful synthesis of high-quality CBO single-crystal thin film would be a cornerstone for the in-depth understanding of the fundamental properties of CBO toward efficient photo-electrochemical water-splitting.

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“…The films were crystallized by annealing at 823 K. The X-ray diffraction (XRD) peak intensity of the film prepared at 873 K was lower than those of the 773 and 823 K cases (Figure c). High temperature can induce evaporation of Bi and decomposition of CuBi 2 O 4 , reducing the amount of the CuBi 2 O 4 phase formed on FTO . The XRD peak intensities increased with an increasing number of layers (Figure d).…”

supporting

confidence: 65%

“…High temperature can induce evaporation of Bi and decomposition of CuBi 2 O 4 , reducing the amount of the CuBi 2 O 4 phase formed on FTO. 25 The XRD peak intensities increased with an increasing number of layers (Figure 1d). The absorbance of CuBi 2 O 4 films was measured using UV−vis spectroscopy (Figure 1a, Figure S2).…”

mentioning

confidence: 96%

All-Bismuth-Based Oxide Tandem Cell for Solar Overall Water Splitting

Kim

Adishev

Kim

et al. 2018

ACS Appl. Energy Mater.

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Photoelectrochemical overall water splitting without an external bias is demonstrated using an all-bismuth-based oxide tandem cell with a CuBi 2 O 4 photocathode and a BiVO 4 photoanode. A solution-based nitrate salt decomposition method is developed for preparing a crystalline p-type CuBi 2 O 4 film with a suitable band gap and Fermi level to serve as a photocathode for water splitting. The optimum CuBi 2 O 4 photocathode is prepared by three-layer deposition and heat-treatment at 823 K, which yields the highest photocurrent density of −0.66 mA cm −2 at 0.4 V RHE and reduction onset potential of ≥1.0 V RHE under 1 sun in O 2 -purged KPi electrolyte. The all-bismuth based oxide tandem cell of Pt/CuBi 2 O 4 photocathode and a cobalt-phosphate (Co-Pi) modified Mo-doped BiVO 4 photoanode give a photocurrent density of ∼0.15 mA cm −2 without any applied bias.

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ChemInform Abstract: Thermal Stability and Phase Transformations in CuBi₂O₄.

Cited by 6 publications

References 0 publications

Comprehensive Evaluation of CuBi₂O₄ as a Photocathode Material for Photoelectrochemical Water Splitting

Comprehensive Evaluation of CuBi₂O₄ as a Photocathode Material for Photoelectrochemical Water Splitting

Template Engineering of CuBi₂O₄ Single‐Crystal Thin Film Photocathodes

All-Bismuth-Based Oxide Tandem Cell for Solar Overall Water Splitting

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ChemInform Abstract: Thermal Stability and Phase Transformations in CuBi2O4.

Cited by 6 publications

References 0 publications

Comprehensive Evaluation of CuBi2O4 as a Photocathode Material for Photoelectrochemical Water Splitting

Comprehensive Evaluation of CuBi2O4 as a Photocathode Material for Photoelectrochemical Water Splitting

Template Engineering of CuBi2O4 Single‐Crystal Thin Film Photocathodes

All-Bismuth-Based Oxide Tandem Cell for Solar Overall Water Splitting

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Product

Resources

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ChemInform Abstract: Thermal Stability and Phase Transformations in CuBi₂O₄.

Comprehensive Evaluation of CuBi₂O₄ as a Photocathode Material for Photoelectrochemical Water Splitting

Comprehensive Evaluation of CuBi₂O₄ as a Photocathode Material for Photoelectrochemical Water Splitting

Template Engineering of CuBi₂O₄ Single‐Crystal Thin Film Photocathodes