Fabrication of Hybrid Catalyst ZnO Nanorod/α-Fe2O3 Composites for Hydrogen Evolution Reaction

Uma, Kasimayan; Elavarasan, Munirathinam; Chong, Siewhui; Yang, Thomas C.-K.; Lin, Ja‐Hon

doi:10.3390/cryst10050356

Cited by 13 publications

(4 citation statements)

References 52 publications

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“…Then, the solid materials were hold still overnight, and the clear solution of the dye was obtained. The clear solution to be used for sensitization purpose was separated from solid materials using glass filters [17,18].…”

Section: Biosynthesis Of Tio 2 Npsmentioning

confidence: 99%

Biotemplated Synthesis of Titanium Oxide Nanoparticles in the Presence of Root Extract of Kniphofia schemperi and Its Application for Dye Sensitized Solar Cells

Bekele

Zereffa

Gultom

et al. 2021

International Journal of Photoenergy

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Metal oxide nanoparticles prepared by biological route using green plant parts as a template are eco-friendly as well as yield good results than the conventional methods. This present study focusses on biosynthesis and characterization of TiO2 NPs using root extract of Kniphofia schemperi for dye-sensitized solar cells. TiO2 NPs were synthesized using 0.25 M titanium tetra butoxide in the presence of root extract of Kniphofia schemperi with the volume ratios. The analysis result revealed that the synthesized TiO2 NPs were thermally stable above 500°C and have spherical morphology, with the average crystalline size of 11.7, 8.3, and 8.6 nm, and band gap energy of 3.35 eV, 3.33 eV, and 3.36 eV, respectively, for the TiO2 NPs prepared at the volume ratios of 2 : 3, 1 : 1, and 3 : 2. Biosynthesized TiO2 NPs were used as photoanode in dye-sensitized solar cells (a device used for converting absorbed light into electricity). Solar cell devices were fabricated using roots of Kniphofia schemperi sensitizer in the presence of TiO2 NPs biosynthesized within (2 : 3, 1 : 1, and 3 : 2) volume ratio, which showed power conversion efficiency of 0.039%, 0.117%, and 1.3%. Incident photon to current conversion efficiency (IPCE) analysis using TiO2 (2 : 3, 1 : 1, and 3 : 2) photoelectrodes showed 6.64%, 2.66%, and 18%. Among the biosynthesized TiO2 different volume ratios, TiO2 (3 : 2) NPs showed relatively maximum solar cell efficiency and IPCE value due to its uniform spherical shape that enables to absorb large dye molecules on its surface, and this intern improves device efficiency.

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Section: Biosynthesis Of Tio 2 Npsmentioning

confidence: 99%

Biotemplated Synthesis of Titanium Oxide Nanoparticles in the Presence of Root Extract of Kniphofia schemperi and Its Application for Dye Sensitized Solar Cells

Bekele

Zereffa

Gultom

et al. 2021

International Journal of Photoenergy

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“…In the past few years, a variety of Fe-based materials have been believed to be an essential class of catalyst for the HER, such as Fe-based nitrides, − oxides, − phosphides, − sulfides, , and so on. Because of their low price, lack of pollution, and superb durability, Fe-based oxides electrocatalysts have received intense attention so far.…”

Section: Introductionmentioning

confidence: 99%

Construction of Fe₂O₃ Nanosheet Arrays by Sulfur Doping toward Efficient Alkaline Hydrogen Evolution

Hao

Zhang

Gao

et al. 2022

ACS Appl. Energy Mater.

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It is indispensable to explore earth-abundant and high-efficiency transition-metal-oxide electrocatalysts toward the hydrogen evolution reaction (HER). However, their catalytic performance is impeded by the poor conductivity. Herein we rationally design and manufacture sulfur-doped Fe2O3 nanosheet arrays grown on iron foam (S-Fe2O3/IF) with enhanced HER performance in alkaline media. The obtained catalyst exhibits a low overpotential of 134 mV to achieve a current density of 10 mA cm–2 with a small Tafel slope of 76 mV dec–1 and shows an excellent long-term durability with barely any degradation for 50 h. The density functional theory calculation and experimental results demonstrate that the sulfur anion could optimize adsorption free energies of hydrogen/water and improve the intrinsic activity of Fe2O3. This work not only develops a catalyst with highly efficient performance but also provides design guidance to rationally manufacture an earth-abundant-element electrocatalyst for large-scale water splitting to hydrogen.

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“…Two half-reactions, HER and OER, are commonly studied in alkaline and acidic media ( Danilovic et al, 2013 ; Wang et al, 2021b ). Many published data exist for ZnO-based catalysts in alkaline media ( Yu et al, 2018 ) and few in acidic media ( Uma et al, 2020 ; Pataniya et al, 2021 ). Therefore, we investigated the catalytic activity of the prepared composites toward HER and OER in both media.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting

Aleksić¹,

Šimatović²,

Stanković³

et al. 2023

Front. Chem.

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Catalytic materials are the greatest challenge for the commercial application of water electrolysis (WEs) and fuel cells (FCs) as clean energy technologies. There is a need to find an alternative to expensive and unavailable platinum group metal (PGM) catalysts. This study aimed to reduce the cost of PGM materials by replacing Ru with RuO2 and lowering the amount of RuO2 by adding abundant and multifunctional ZnO. A ZnO@RuO2 composite in a 10:1 molar ratio was synthesized by microwave processing of a precipitate as a green, low-cost, and fast method, and then annealed at 300°C and 600°C to improve the catalytic properties. The physicochemical properties of the ZnO@RuO2 composites were investigated by X-ray powder diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The electrochemical activity of the samples was investigated by linear sweep voltammetry in acidic and alkaline electrolytes. We observed good bifunctional catalytic activity of the ZnO@RuO2 composites toward HER and OER in both electrolytes. The improved bifunctional catalytic activity of the ZnO@RuO2 composite by annealing was discussed and attributed to the reduced number of bulk oxygen vacancies and the increased number of established heterojunctions.

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Fabrication of Hybrid Catalyst ZnO Nanorod/α-Fe2O3 Composites for Hydrogen Evolution Reaction

Cited by 13 publications

References 52 publications

Biotemplated Synthesis of Titanium Oxide Nanoparticles in the Presence of Root Extract of Kniphofia schemperi and Its Application for Dye Sensitized Solar Cells

Biotemplated Synthesis of Titanium Oxide Nanoparticles in the Presence of Root Extract of Kniphofia schemperi and Its Application for Dye Sensitized Solar Cells

Construction of Fe₂O₃ Nanosheet Arrays by Sulfur Doping toward Efficient Alkaline Hydrogen Evolution

Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting

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Fabrication of Hybrid Catalyst ZnO Nanorod/α-Fe2O3 Composites for Hydrogen Evolution Reaction

Cited by 13 publications

References 52 publications

Biotemplated Synthesis of Titanium Oxide Nanoparticles in the Presence of Root Extract of Kniphofia schemperi and Its Application for Dye Sensitized Solar Cells

Biotemplated Synthesis of Titanium Oxide Nanoparticles in the Presence of Root Extract of Kniphofia schemperi and Its Application for Dye Sensitized Solar Cells

Construction of Fe2O3 Nanosheet Arrays by Sulfur Doping toward Efficient Alkaline Hydrogen Evolution

Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting

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Construction of Fe₂O₃ Nanosheet Arrays by Sulfur Doping toward Efficient Alkaline Hydrogen Evolution