UV-assisted water splitting of stable Cl-doped ZnO nanorod photoanodes grown via facile sol-gel hydrothermal technique for enhanced solar energy harvesting applications

Sahoo, Pooja; Sharma, Akash; Padhan, Subash; Udayabhanu, G.; Thangavel, R.

doi:10.1016/j.solener.2019.09.045

Cited by 54 publications

(12 citation statements)

References 82 publications

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“…Further, the respective unknown edge potentials were calculated by the following formula (Eq. 9) and was found to be 1.99 V (VB), − 1.39 V (CB) and 1.72 V (VB) of the bare AgNbO 3 , Co 3 O 4 and composite [49].…”

Section: Electrochemical Behaviourmentioning

confidence: 99%

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Heterojunction formation between AgNbO3 and Co3O4 for full solar light utilization with improved charge-carrier separation

Rani

Saravanan

2022

Photochem Photobiol Sci

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In the present study, the charge-carrier recombination of visible light active perovskite silver niobate (AgNbO 3 ) was reduced by forming heterojunction with Co 3 O 4 through simple impregnation and calcination route. The loading percentage of Co 3 O 4 was varied as 2, 5, and 10 wt.%. The XRD study revealed reduced interlayer spacing in the composite due to the replacement of the bigger Ag + ions by the smaller Co 2+ and Co 3+ ions of Co 3 O 4 . It was observed that the light harvesting efficiency of the materials was increased with increased loading of Co 3 O 4 . The TEM and XPS analysis confirmed the presence of Ag nanoparticles over the perovskite in the composite. The electrochemical analysis revealed enhanced charge-carrier number density and increased charge-carrier lifetime in the composite as a result of the presence of both silver and cobalt ions in the lattice. Further this enhanced charge-carrier separation of the composites was established through photocatalysis of Bisphenol-A under both solar and LED light. Charge-trapping study indicated *O 2 − and *OH as the major radicals involved and Z-scheme as the predominant charge transfer pathway for generation of these reactive oxygen species.

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Section: Electrochemical Behaviourmentioning

confidence: 99%

“…This reduction was almost in the similar order with very minor variation. The light harvesting efficiency (LHE) of the materials was calculated by the following formula [49]:…”

Section: Optical Characteristicsmentioning

confidence: 99%

Heterojunction formation between AgNbO3 and Co3O4 for full solar light utilization with improved charge-carrier separation

Rani

Saravanan

2022

Photochem Photobiol Sci

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“…(6) Additionally, the photon harvesting ability of the studied photocatalysts was also evaluated by determining the light harvesting efficiency (LHE). The LHE of the material was determined from the following equation and has been demonstrated in Figure 5g [29]. (7) where T and R denote the transmittance and reflectance for the specified materials, respectively.…”

Section: Optical Studiesmentioning

confidence: 99%

LED-light-activated photocatalytic performance of metal-free carbon-modified hexagonal boron nitride towards degradation of methylene blue and phenol

Mishra¹,

Saravanan²

2022

Beilstein J. Nanotechnol.

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The present study outlines the transformation of non-photoresponsive hexagonal boron nitride (HBN) into a visible-light-responsive material. The carbon modification was achieved through a solid-state reaction procedure inside a tube furnace under nitrogen atmosphere. In comparison to HBN (bandgap of 5.2 eV), the carbon-modified boron nitride could efficiently absorb LED light irradiation with a light harvesting efficiency of ≈90% and a direct bandgap of 2 eV. The introduction of carbon into the HBN lattice led to a significant change in the electronic environment through the formation of C–B and C–N bonds which resulted in improved visible light activity, lower charge transfer resistance, and improved charge carrier density (2.97 × 1019 cm−3). This subsequently enhanced the photocurrent density (three times) and decreased the photovoltage decay time (two times) in comparison to those of HBN. The electronic band structure (obtained through Mott–Schottky plots) and charge trapping analysis confirmed the dominance of e−, O2−•, and •OH as dominant reactive oxygen species. The carbon modification could effectively remove 93.83% of methylene blue (MB, 20 ppm solution) and 48.56% of phenol (10 ppm solution) from the aqueous phase in comparison to HBN which shows zero activity in the visible region.

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“…13 Elemental doping can assist in enhancing the characteristics of ZnO such as structural, electrical and optical properties for improving PEC performance by reducing the bandgap and decreasing the recombination. Most of the previous research are mainly focused on doping with metallic elements (Co, Fe, V, Ge and Cu) or nonmetallic elements such as Cl, P and N. [14][15][16][17][18][19][20] For example, Salem et al found that the Ge-doped ZnO nanorods deposited by the sputtering method may narrow the electronic band structure and improve the conductivity of the materials. 20 Likewise, Rasouli et al proved that the Cu-doped ZnO thin films prepared by electrodeposition method could enhance the charge carrier separation in PEC-WS.…”

mentioning

confidence: 99%

“…14 Sahoo et al fabricated a low-cost Cl-doped ZnO for solar water splitting application. 15 Abdus et al improved the efficiency of hybrid solar cells by doping Ag and Nd into ZnO due to the bandgap turning. 22 In addition, Humaira et al described AACVD method to prepare Cr-doped ZnO photoanode for visible light-driven water splitting application.…”

mentioning

confidence: 99%

Enhanced light absorption and charge separation of In‐doped ZnO nanorod arrays for photoelectrochemical water‐splitting application

Truong

Lam

et al. 2021

Intl J of Energy Research

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Elemental doping promises an efficient strategy to modify and optimize the performance of metal oxide photoanodes. Herein, we introduce a simple hydrothermal method to fabricate In-doped ZnO thin films on the fluorinedoped tin oxide (FTO) to use as a photoanode for water splitting application.The effects of In-doping on the structural, optical, morphological, and electrical properties of ZnO nanorods were studied. PEC results indicate that the 5%In doped ZnO photoanode determined an outstanding photocurrent density reached 0.42 mA/cm 2 at 0.64 V Ag/AgCl , which is four times higher than the undoped ZnO sample (0.1 mA/cm 2 ). Furthermore, Ultraviolet-visible spectroscopy (UV-Vis) and photoluminescence spectroscopy (PL) studies showed a red-shift in the band edge of doped samples compared to the pure samples, which indicate that the light absorption is enhanced. We find that the optimal doping of In (5%) leads to smaller charge transfer resistance and higher electron transfer rate as confirmed from EIS analysis. Therefore, fabricated Indoped ZnO could be a favorable and potential photoelectrode for lightharvesting and water splitting application.

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UV-assisted water splitting of stable Cl-doped ZnO nanorod photoanodes grown via facile sol-gel hydrothermal technique for enhanced solar energy harvesting applications

Cited by 54 publications

References 82 publications

Heterojunction formation between AgNbO3 and Co3O4 for full solar light utilization with improved charge-carrier separation

Heterojunction formation between AgNbO3 and Co3O4 for full solar light utilization with improved charge-carrier separation

LED-light-activated photocatalytic performance of metal-free carbon-modified hexagonal boron nitride towards degradation of methylene blue and phenol

Enhanced light absorption and charge separation of In‐doped ZnO nanorod arrays for photoelectrochemical water‐splitting application

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