Characterization of Cu<sub>2</sub>O/CuO heterostructure photocathode by tailoring CuO thickness for photoelectrochemical water splitting

Jeong, Dasol; Jo, Woohyeon; Jeong, Jong Hwa; Kim, Taegeon; Han, Seungyeon; Son, Moonho; Jung, Hyunsung

doi:10.1039/d1ra08863g

Cited by 39 publications

(28 citation statements)

References 35 publications

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“…This led to TC400 absorbing across a longer wavelength range than TC200, as revealed in the previous absorption analysis, thereby increasing light absorption and promoting the photoexcited carrier density. This has also been demonstrated in previous work on the photoactive performance of a Cu 2 O/CuO system [32,47]. Notably, TC300 and TC350 displayed the best photoresponse abilities among the various nanorod samples, revealing that the composite nanorod system decorated with dual Cu 2 O and CuO phases was a more efficient material combination for enhancing the photoactivity of the copper oxide-TiO 2 composite nanorods.…”

Section: Resultssupporting

confidence: 82%

“…Moreover, TC350 also had a larger surface particle size in the decorated copper oxide layer in comparison to that of TC300. A larger grain size reduces grain boundaries in the decorated copper oxide layer, resulting in enhanced charge transport [ 47 ]. The ternary phase and suitable microstructural and optical properties of TC350 mean that it has excellent photoactivity compared to the other TC composite samples.…”

Section: Resultsmentioning

confidence: 99%

“…transport [47]. The ternary phase and suitable microstructural and optical properties of TC350 mean that it has excellent photoactivity compared to the other TC composite samples.…”

Section: Conflicts Of Interestmentioning

confidence: 99%

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Sputtering-Assisted Synthesis of Copper Oxide–Titanium Oxide Nanorods and Their Photoactive Performances

Liang

2022

Nanomaterials

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A TiO2 nanorod template was successfully decorated with a copper oxide layer with various crystallographic phases using sputtering and postannealing procedures. The crystallographic phase of the layer attached to the TiO2 was adjusted from a single Cu2O phase or dual Cu2O–CuO phase to a single CuO phase by changing the postannealing temperature from 200 °C to 400 °C. The decoration of the TiO2 (TC) with a copper oxide layer improved the light absorption and photoinduced charge separation abilities. These factors resulted in the composite nanorods demonstrating enhanced photoactivity compared to that of the pristine TiO2. The ternary phase composition of TC350 allowed it to achieve superior photoactive performance compared to the other composite nanorods. The possible Z-scheme carrier movement mechanism and the larger granular size of the attached layer of TC350 under irradiation accounted for the superior photocatalytic activity in the degradation of RhB dyes.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

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Sputtering-Assisted Synthesis of Copper Oxide–Titanium Oxide Nanorods and Their Photoactive Performances

Liang

2022

Nanomaterials

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“…Figure demonstrates the XRD diffraction peaks of pristine Cu x O and Sn‐doped Cu x O. The diffraction patterns of Cu x O (black) at 31.8, 33.9, 35.6, 38.1, and 38.8⁰ correspond to the crystal directions of CuO (110), [ 26 ] CuO (−111), [ 26 ] Cu 2 O (111), [ 27 ] CuO (111), [ 28 ] and Cu 2 O (200), respectively. [ 29 ] The peak labeled crystal planes displayed the most intense XRD signals with a nearly equal magnitude as the preferred growth orientations.…”

Section: Resultsmentioning

confidence: 99%

Two Electron Transfer Mediated Enhanced Electrochemical Nitrate Detection by Sn‐Doped Cu_xo Thin Film Electrode

Ndala

Kibambo

Mkhari

et al. 2023

Advanced Sensor Research

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The unique electrochemical and electronic properties of CuxO (Cu2O/CuO) give it merit to be used in the development of electronic devices. This paper presents the facile chemical route for the development of a sensitive, accurate, and low‐cost nitrate electrochemical sensor based on undoped and Sn‐doped CuxO thin film electrodes. Various characterization techniques are used to study the physical, electro‐chemical, and electronic properties of the material. Sn‐doping resulted in an increase in the number of electron transfers from 1 to 2 as compared to undoped CuxO. The prepared sensor exhibited a high sensitivity of 100.3 µA mm−1 cm−2, a wide linear concentration range of up to 50.0 mm, a fast response time of <5.0 s is observed at a potential of −1.0 V (vs Ag/AgCl), and a very low limit of detection of 0.1 µm (S/N = 3.0) that outperformed those in the recent literature. The electrode is selective for nitrate in the presence of common interference species and exhibited chemical stability and reproducibility.

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“…In the O 1s spectrum (Figure S4), the peaks of 532.0 and 529.8 eV corresponded to adsorbed oxygen (O ads ) and lattice oxygen (O lat ) in C-doped CuO/Cu 2 O, respectively. 38,39 Furthermore, three characteristic peaks of the C−C, C−O, and C�O bonds could be observed (Figure 3b). The peak at 289.2 eV reveals the formation of the C−O−Cu structure after C doping.…”

Section: Introductionmentioning

confidence: 99%

Cu-MOF-Derived C-Doped CuO/Cu₂O Hollow Nano-Octahedrons for Room-Temperature NO₂ Sensing at the ppb Level

Ma,

Yang,

et al. 2024

ACS Appl. Nano Mater.

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P-type semiconductors [copper oxide (CuO) and cuprous oxide (Cu 2 O)] have been widely researched as good gas sensing materials due to their unique oxygen adsorption properties. In this work, C-doped CuO/Cu 2 O hollow nano-octahedrons have been prepared by thermal decomposition of the Cu-based metal−organic framework ([Cu 3 (BTC) 2 ] n ). The CuO and Cu 2 O nanoparticles form nano-octahedron heterojunctions by a close packing mode. A large number of active heterojunction sites were exposed, which significantly increased the adsorbed oxygen (O 2 − ) content. Meanwhile, doping C in the lattice of the heterojunction effectively reduces the band gap of CuO/Cu 2 O and promotes the chemical reaction of the target gas on the surface of the material. Density functional theory calculations indicate that the CuO/Cu 2 O heterojunction has strong adsorption ability for NO 2 . Electrochemical impedance spectroscopy further reveals that C-doped CuO/Cu 2 O hollow nano-octahedrons-40 min heterojunction has the best electron transport performance. The sensors have good gas sensing response (22.88−50 ppm) and selectivity to nitrogen dioxide (NO 2 ) at room temperature (28 °C). In addition, the sensor has extremely low detection, which can detect parts per billion level NO 2 (20.50% to 100 ppb). It is expected to provide a reference for the development of a room-temperature NO 2 sensor.

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Characterization of Cu₂O/CuO heterostructure photocathode by tailoring CuO thickness for photoelectrochemical water splitting

Abstract: Optimization of CuO thickness in the Cu2O/CuO photocathode by controlling the annealing time: optimal thickness of CuO induces the improved light utilization and band bending, resulting in the enhanced photoelectrochemical performance.

Cited by 39 publications

References 35 publications

Sputtering-Assisted Synthesis of Copper Oxide–Titanium Oxide Nanorods and Their Photoactive Performances

Sputtering-Assisted Synthesis of Copper Oxide–Titanium Oxide Nanorods and Their Photoactive Performances

Two Electron Transfer Mediated Enhanced Electrochemical Nitrate Detection by Sn‐Doped Cu_xo Thin Film Electrode

Cu-MOF-Derived C-Doped CuO/Cu₂O Hollow Nano-Octahedrons for Room-Temperature NO₂ Sensing at the ppb Level

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Characterization of Cu2O/CuO heterostructure photocathode by tailoring CuO thickness for photoelectrochemical water splitting

Abstract: Optimization of CuO thickness in the Cu2O/CuO photocathode by controlling the annealing time: optimal thickness of CuO induces the improved light utilization and band bending, resulting in the enhanced photoelectrochemical performance.

Cited by 39 publications

References 35 publications

Sputtering-Assisted Synthesis of Copper Oxide–Titanium Oxide Nanorods and Their Photoactive Performances

Sputtering-Assisted Synthesis of Copper Oxide–Titanium Oxide Nanorods and Their Photoactive Performances

Two Electron Transfer Mediated Enhanced Electrochemical Nitrate Detection by Sn‐Doped Cuxo Thin Film Electrode

Cu-MOF-Derived C-Doped CuO/Cu2O Hollow Nano-Octahedrons for Room-Temperature NO2 Sensing at the ppb Level

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Product

Resources

About

Characterization of Cu₂O/CuO heterostructure photocathode by tailoring CuO thickness for photoelectrochemical water splitting

Two Electron Transfer Mediated Enhanced Electrochemical Nitrate Detection by Sn‐Doped Cu_xo Thin Film Electrode

Cu-MOF-Derived C-Doped CuO/Cu₂O Hollow Nano-Octahedrons for Room-Temperature NO₂ Sensing at the ppb Level