Tuning of the structural, morphological, optoelectronic and interfacial properties of electrodeposited Cu2O towards solar water-splitting by varying the deposition pH

Hamdani, Iqra Reyaz; Bhaskarwar, Ashok N.

doi:10.1016/j.solmat.2022.111719

Cited by 16 publications

(9 citation statements)

References 32 publications

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“…The inset in Figure a schematically illustrates the crystal structure of the cubic TiHCF with an intact unit cell whose 3D open frameworks are suitable for Zn 2+ insertion. The broadening of diffraction peaks suggests its nanoscale nature, and the estimated size of crystallite particles is ∼4.7 nm according to the Scherrer equation . No additional diffraction peaks are detected, confirming the material purity.…”

Section: Resultsmentioning

confidence: 93%

One-Step Coprecipitation Synthesis of Titanium Hexacyanoferrate Nanosheet-Assembled Hierarchical Nanoflowers for Aqueous Zinc-Ion Batteries

Xu,

Ye,

Xiao

et al. 2023

ACS Appl. Nano Mater.

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Constructing three-dimensional hierarchical nanostructures has been considered one of the most effective strategies to improve electrode material performance for electrochemical energy storage. Herein, titanium hexacyanoferrate hierarchical nanoflowers (TiHCF HNFs) assembled by TiHCF nanosheets have been synthesized through a facile one-step coprecipitation approach. As a cathode material of aqueous zincion batteries (AZIBs), TiHCF HNFs exhibit an operating voltage of 1.72 V and a reversible capacity of 67.8 mAh g −1 . Impressively, TiHCF HNFs deliver a specific capacity of 47.0 mAh g −1 after 500 cycles with a retention rate of 70.6% under 200 mA g −1 . This work may inspire the synthesis of Prussian blue analogue nanosheets and provide an understanding on the evolution of the TiHCF cathode for AZIBs.

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Section: Resultsmentioning

confidence: 93%

One-Step Coprecipitation Synthesis of Titanium Hexacyanoferrate Nanosheet-Assembled Hierarchical Nanoflowers for Aqueous Zinc-Ion Batteries

Xu,

Ye,

Xiao

et al. 2023

ACS Appl. Nano Mater.

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“…These measurements were made in 0.5 M Na 2 SO 4 at a perturbation potential of 0.5 V at the frequency range of 10 4 Hz. Figure 10 exhibits the Nyquist plot (Z imaginary vs. Z real) for the Cu 2 O samples, which was fitted by ZSimpWin software with the equivalent electrical circuit model of R(Q(R(Q(RW)))), including the solution resistance (R1), charge-transfer resistance (R2), adsorption resistance (R3), constant phase element (Q) and Warburg’s impedance (W) [ 55 ]. The Nyquist plots include semicircles, and the diameter equals the resistance to charge transfer (R CT ) across the electrode/electrolyte interface.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Structural, Optical and Photoelectrochemical Properties of n−Cu2O Thin Films with K Ions Doping toward Biosensor and Solar Cell Applications

et al. 2023

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n-type Cu2O thin films were grown on conductive FTO substrates using a low-cost electrodeposition method. The doping of the n−Cu2O thin films with K ions was well identified using XRD, Raman, SEM, EDX, UV-vis, PL, photocurrent, Mott–Schottky, and EIS measurements. The results of the XRD show the creation of cubic Cu2O polycrystalline and monoclinic CuO, with the crystallite sizes ranging from 55 to 25.2 nm. The Raman analysis confirmed the presence of functional groups corresponding to the Cu2O and CuO in the fabricated samples. Moreover, the samples’ crystallinity and morphology change with the doping concentrations which was confirmed by SEM. The PL results show two characteristic emission peaks at 520 and 690 nm which are due to the interband transitions in the Cu2O as well as the oxygen vacancies in the CuO, respectively. Moreover, the PL strength was quenched at higher doping concentrations which reveals that the dopant K limits e−/h+ pairs recombination by trapped electrons and holes. The optical results show that the absorption edge is positioned between 425 and 460 nm. The computed Eg for the undoped and K−doped n−Cu2O was observed to be between 2.39 and 2.21 eV. The photocurrent measurements displayed that the grown thin films have the characteristic behavior of n-type semiconductors. Furthermore, the photocurrent is enhanced by raising the doped concentration, where the maximum value was achieved with 0.1 M of K ions. The Mott–Schottky measurements revealed that the flat band potential and donor density vary with a doping concentration from −0.87 to −0.71 V and 1.3 × 1017 to 3.2 × 1017 cm−3, respectively. EIS shows that the lowest resistivity to charge transfer (Rct) was attained at a 0.1 M concentration of K ions. The outcomes indicate that doping n−Cu2O thin films are an excellent candidate for biosensor and photovoltaic applications.

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“…In addition, the effect of the Er/Ti dopants on the crystal sizes of the samples was investigated using the Debye–Scherrer relation,

D = K λ / β cos Φ

, where D is the average crystal size,

K = 0.9

, which represents the Scherrer constant,

λ = 0.154 nm

and denotes the wavelength of the Cu K α ‐radiation, whereas β represents the full‐width at half‐maxima, and

Φ = 2 θ / 2

, is Bragg's angle. [ 36 ] The crystal sizes obtained for the pristine hematite NRs, and Er/Ti‐doped samples are shown in Table 1 . The results reveal random variations in crystallite sizes as the dopant concentration increased over the pristine hematite NRs.…”

Section: Resultsmentioning

confidence: 99%

Erbium and Titanium Co‐Doped Hematite Nanorods: Structural, Optical, and Catalytic Properties for Enhanced Water Splitting

Talibawo

Kyesmen

Cyulinyana

et al. 2023

Physica Status Solidi (a)

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Herein, hydrothermally synthesized hematite nanorods (NRs) co‐doped with erbium and titanium, using titanium tetrachloride and erbium(III) nitrate pentahydrate as the dopant sources, are presented. The effect of varied volumes of the erbium/titanium surface co‐dopants on the morphology, structural, optical, and photoelectrochemical (PEC) properties of hematite NRs is investigated. The pristine hematite, 40 μL‐Er, and 40 μL‐Er/20 μL‐Ti‐doped NRs samples present a similar surface morphology of vertically aligned NRs. The NRs are randomly oriented with an increase in titanium dopant for the 40 μL‐Er/30 μL‐Ti‐doped NRs and later coalesced for the 40 μL‐Er/40 μL‐Ti‐doped NRs. The structural analysis based on X‐ray diffraction and Raman analysis present a uniform, pure hematite phase for all the prepared NRs. The samples exhibit high photon absorbance with peaks in the 400–450 nm wavelength range of the visible spectrum. The 40 μL‐Er/40 μL‐Ti‐doped NRs sample present the highest photocurrent density of 83.9 μA cm−2 at 1.4 V vs reversible hydrogen electrode (RHE) and is attributed to the lowest flat band potential (−0.76 V vs RHE) that enhances charge mobility at the electrode–electrolyte interface. These results reveal the facile erbium/titanium doping of hematite NRs as a viable strategy for enhancing their PEC water‐splitting performance.

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Tuning of the structural, morphological, optoelectronic and interfacial properties of electrodeposited Cu2O towards solar water-splitting by varying the deposition pH

Cited by 16 publications

References 32 publications

One-Step Coprecipitation Synthesis of Titanium Hexacyanoferrate Nanosheet-Assembled Hierarchical Nanoflowers for Aqueous Zinc-Ion Batteries

One-Step Coprecipitation Synthesis of Titanium Hexacyanoferrate Nanosheet-Assembled Hierarchical Nanoflowers for Aqueous Zinc-Ion Batteries

Enhancement of Structural, Optical and Photoelectrochemical Properties of n−Cu2O Thin Films with K Ions Doping toward Biosensor and Solar Cell Applications

Erbium and Titanium Co‐Doped Hematite Nanorods: Structural, Optical, and Catalytic Properties for Enhanced Water Splitting

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