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

Kim, Jin Hyun; Adishev, Aldiar; Kim, Jeehye; Kim, Yoon Seo; Cho, Seungho; Lee, Jin Ho

doi:10.1021/acsaem.8b01025

Cited by 23 publications

(12 citation statements)

References 30 publications

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“…[16,17] Recently, Cu-based ternary oxides with transition-metals have garnered attention as an alternative p-type semiconductor photocathode material owing to their relative photostability. [18] Among them, kusachiite CuBi 2 O 4 (CBO) has recently attracted considerable attention as a promising PEC photocathode material candidate for tandem cell devices and CO 2 reduction under visible-light illumination due to its narrow bandgap of 1.6-1.9 eV, [19][20][21][22] appropriate conduction band edge position for H 2 evolution and CO 2 reduction, as well as high-onset potential of ≈1.0 V versus reversible hydrogen electrode (RHE). [23][24][25] However, the PEC performance of a CBO thin film photocathode does not reach its theoretical efficiency toward sustainable hydrogen production, [17] since they also suffer from photocorrosion due to sluggish charge transport properties under illumination in electrolytes.…”

Section: Introductionmentioning

confidence: 99%

“…The d (200)spacing calculated by Bragg's law (2dsinθ = nλ) corresponds to the a-axis lattice parameter (a = b = 8.51 Å) of theoretical bulk CBO. [34] The CBO (250 nm)/NiO (20,40,70, and 100 nm) thin films grown on the SRO/STO (001) substrate only exhibited (200), (400), and (600) reflections of the CBO crystalline phase without any secondary phase. It shows that the a-oriented CBO was dominated with respect to the NiO template grown on the STO (001).…”

Section: Introductionmentioning

confidence: 99%

“…To identify the effect of the NiO template layer thickness on the dark-current suppression in the CBO single-crystal thin film photocathodes, the chopped LSV curves of the CBO (250 nm)/NiO thin film photocathodes depending on the NiO template layer thickness were measured (Figure 7c). (For the chopped LSV curves of the CBO/NiO thin film photocathodes measured in KPi buffer solution + H 2 O 2 , see the Figure S8, Supporting Information) The LSV curves of the CBO (250 nm)/NiO (20,40,70, and 100 nm) thin film photocathodes were distinctly prominent under light/dark, while that of the CBO (250 nm)/NiO (0 and 5 nm) exhibited no major differences between light/dark. The formation of the CBO crystal phase depending on NiO template thickness accounted for the LSV curves' discrepancies.…”

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confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Template Engineering of CuBi₂O₄ Single‐Crystal Thin Film Photocathodes

Lee

Yoon

Choi

et al. 2020

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“…In addition, the photocathode can obtain a more positive photocurrent onset potential (> 1.0 V vs. reversible hydrogen electrode (RHE)) due to its large valence maximum [6]. As a result, solar-driven reduction reaction without an external bias could easily be achieved [7]. Up to now, CBO photocathode was mainly used for solar-driven PEC water reduction [8].…”

Section: Introductionmentioning

confidence: 99%

Gd-doped CuBi2O4/CuO heterojunction film photocathodes for photoelectrochemical H2O2 production through oxygen reduction

Gou

et al. 2021

Nano Res.

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Photoelectrochemical oxygen reduction reaction (ORR) toward H 2 O 2 is highly desirable because only sunlight, O 2 and water are required in the process. However, the corresponding studies are still at its infancy because of the lack of suitable photocathodes, especially inorganic semiconductor photocathodes. In this work, we report CuBi 2 O 4 /CuO (CBO/CuO) heterojunction submicrocrystalline film photocathodes with efficient ORR activity for H 2 O 2 production. The heterojunction film photocathodes were prepared through thermal evaporation of Cu and Bi metals under vacuum and subsequent annealing treatment. Furthermore, the doping of Gd 3+ ions into CBO/CuO could significantly enhance the yield of H 2 O 2 . As a result, the concentration of H 2 O 2 could reach 1.3 mM within 30 min, which is 6 times higher than that obtained on the pristine CBO/CuO photocathode. The theoretical calculations suggested that the introduction of Gd could adjust the electronic structure of CBO surface and promote 2e ORR pathway for selective production of H 2 O 2 . Our work not only provides a new strategy for designing highly efficient photocathode for H 2 O 2 production but also will evoke more interest in photoelectrocatalytic ORR through inorganic semiconductor photocathode.

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“…This feature ensures CuBi 2 O 4 a larger energy band bending when it is in contact with water to achieve Fermi-level equilibrium. Therefore, a larger photovoltage is expected and hence a surprisingly positive onset potential over 1.000 V vs reversible hydrogen electrode (RHE) for HER was achieved on CuBi 2 O 4 . ,, A larger photovoltage is beneficial to obtain a large photocurrent density when CuBi 2 O 4 is employed as a photocathode to assemble PEC cells with photoanodes for overall water splitting. − …”

Section: Introductionmentioning

confidence: 99%

Dendritic CuBi₂O₄ Array Photocathode Coated with Conformal TiO₂ Protection Layer for Efficient and Stable Photoelectrochemical Hydrogen Evolution Reaction

et al. 2021

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Short carrier diffusion length and poor photostability are two major bottlenecks limiting the application of CuBi2O4 as a competitive candidate for photoelectrochemical (PEC) hydrogen evolution reaction (HER). To overcome the bottlenecks, we develop a novel template-assisted synthesis strategy to prepare the CuBi2O4 dendrites and then protect the dendritic structure with a conformal nanometer-thick TiO2 passivation layer. The obtained CuBi2O4/TiO2 composite dendrites exhibit high activity for the PEC HER with a photocurrent density of ca. 0.90 mA cm–2 at 0.200 V vs reversible hydrogen electrode (RHE) in neutral solution, and this value is among the highest reported on CuBi2O4-based photocathodes at the same potential. Moreover, the CuBi2O4/TiO2 dendrites show a high photostability with the photocurrent density being stabilized at ca. 0.36 mA cm–2 (88.8% of its original value) after 6 h measurements at a high applied potential of 0.600 V vs RHE, which is superior to all CuBi2O4-based photocathodes reported recently in the literature. This work provides an effective strategy to improve the activity and stability of the copper-oxide-based materials for the HER via constructing a dendritic structure and protecting the structure with a nanoscale TiO2 passivation layer.

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

Cited by 23 publications

References 30 publications

Template Engineering of CuBi₂O₄ Single‐Crystal Thin Film Photocathodes

Template Engineering of CuBi₂O₄ Single‐Crystal Thin Film Photocathodes

Gd-doped CuBi2O4/CuO heterojunction film photocathodes for photoelectrochemical H2O2 production through oxygen reduction

Dendritic CuBi₂O₄ Array Photocathode Coated with Conformal TiO₂ Protection Layer for Efficient and Stable Photoelectrochemical Hydrogen Evolution Reaction

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

Cited by 23 publications

References 30 publications

Template Engineering of CuBi2O4 Single‐Crystal Thin Film Photocathodes

Template Engineering of CuBi2O4 Single‐Crystal Thin Film Photocathodes

Gd-doped CuBi2O4/CuO heterojunction film photocathodes for photoelectrochemical H2O2 production through oxygen reduction

Dendritic CuBi2O4 Array Photocathode Coated with Conformal TiO2 Protection Layer for Efficient and Stable Photoelectrochemical Hydrogen Evolution Reaction

Contact Info

Product

Resources

About

Template Engineering of CuBi₂O₄ Single‐Crystal Thin Film Photocathodes

Template Engineering of CuBi₂O₄ Single‐Crystal Thin Film Photocathodes

Dendritic CuBi₂O₄ Array Photocathode Coated with Conformal TiO₂ Protection Layer for Efficient and Stable Photoelectrochemical Hydrogen Evolution Reaction