Direct in situ synthesis of Fe2O3-codoped N-doped TiO2 nanoparticles with enhanced photocatalytic and photo-electrochemical properties

Sun, Mingxuan; Fang, Yalin; Kong, Yuanyuan; Yuan, Xiaojiao; Shi, Jifeng; Umar, Ahmad

doi:10.1016/j.jallcom.2017.02.062

Cited by 34 publications

(9 citation statements)

References 53 publications

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“…Further, to quantify the efficacy of the nanopyramidal structure, photoconversion efficiency (η %) is determined. The photoconversion efficiency is calculated with the help of the J – V curve and the following equation is used , where J is the photocurrent density, V RHE is the applied potential with respect to the RHE, and P in is the incident light intensity. The maximum photoconversion efficiency is observed in the case of the In 2 S 3 /In 2 O 3 -B-5 nanopyramid structure, which is 0.55% at 0.770 V versus the RHE.…”

Section: Resultsmentioning

confidence: 99%

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Photoelectrochemical Water Splitting by In₂S₃/In₂O₃ Composite Nanopyramids

Sharma

Mahala

Basu

2020

ACS Appl. Nano Mater.

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Photoelectrochemical (PEC) water-splitting reaction becomes an important path for the requirement of the fulfillment of global energy demand. For PEC water-splitting reactions, here In2O3 is grown in situ in the nanopyramidal structure of In2S3 via a simple hydrothermal technique. The limited supply of S2– in the reaction medium plays an important role in the development of In2O3 along with In2S3, leading to the In2S3/In2O3 nanocomposite. The In2S3/In2O3 nanocomposite shows an enriched carrier density compared to bare In2S3. The optimum amount of In2O3 in the composite helps to achieve efficient photoactivity. In addition, the observed negative shift of the flat band potential of the nanocomposite demonstrates the assistance of the early onset potential. Moreover, the In2S3/In2O3 nanocomposite shows improved visible light absorbance due to its pyramidal nanostructure. It can generate a high photoconversion efficiency of ∼0.55% at 0.77 V versus the reversible hydrogen electrode (RHE) in 0.5 M Na2SO4. The stability of the In2S3/In2O3 nanopyramid is determined under chopped illumination condition for 1000 s, which shows decay in the stability in the Na2SO4 medium. Importantly, to widen the applicability of the In2S3/In2O3 composite, the PEC water-splitting performance is determined in 3.5% saline water. Under such a corrosive environment, In2S3/In2O3 can show efficient photoactivity as well as outstanding stability. It can generate a photocurrent density of 0.83 mA/cm2 under an applied potential of 1.18 V versus the RHE. The present research suggests the development of the In2S3/In2O3 nanopyramid composite as a chloride environment-withstanding and high corrosion-resistant photoanode. The advantage of the faceted nanopyramidal structure and the composite is focused here. It paves an avenue for the development and engineering of highly persistent seawater-splitting photoelectrodes, which provides an opportunity to use the vast seawater on the Earth as an energy carrier.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Photoelectrochemical Water Splitting by In₂S₃/In₂O₃ Composite Nanopyramids

Sharma

Mahala

Basu

2020

ACS Appl. Nano Mater.

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“…Using CasaXPS software, three peaks were deconvoluted in N 1s XPS spectra. On the basis of the literature, , the peaks in the range of 395–399 eV were assigned to substituted N species, wherein the Ti–N linkage was formed by replacing O anions with N anions. The peaks around 400.1 eV were ascribed to interstitial N, which corresponded to the Ti–O–N bond. ,, In addition, the peaks above 400.5 eV were attributed to oxidized N species originating from Ti–NO or Ti–NO 2 bonds. , According to the integral area of three deconvoluted peaks, the distribution of various N species was derived.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen-Doped Ni/TiO₂ Catalyst with Enhanced Activity and Improved Selectivity for CO₂ Methanation

Wang

Yan

et al. 2022

Energy Fuels

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The construction of efficient catalysts is still the bottleneck for the industrialization of CO 2 methanation. Herein, a nitrogen (N)-doping strategy was developed to boost both activity and selectivity of the Ni/TiO 2 catalyst, wherein N-doped TiO 2 was prepared by a mild sol−gel method and employed as the support for Ni catalysts. In detail, CO 2 conversion at 350 °C over the Ni/TiO 2 and Ni/N 10 -TiO 2 catalysts was 9.6 and 41.7%, respectively. CH 4 selectivity at 400 °C over the Ni/TiO 2 and Ni/N 10 -TiO 2 catalysts was 44.1 and 84.6%, respectively. In comparison to the undoped Ni/ TiO 2 catalyst, the Ni/N 10 -TiO 2 catalyst had a smaller Ni size and enriched basic sites, leading to enhanced activity. The introduction of N dopants transformed TiO 2 phases from anatase into rutile and induced intimate contact between Ni nanoparticles and rutile TiO 2 , resulting in improved CH 4 selectivity. Substituted, interstitial, and oxidized N species were detected on the surface of N-doped Ni/ TiO 2 catalysts, among which substituted N was identified as the most critical species. The present work provides a facile and feasible strategy to promote both activity and selectivity of supported catalysts in CO 2 hydrogenation.

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“…19 Fe 2 O 3 , as a highly active photocatalyst with a band gap of 2.2 eV, seems to be a good choice except it has a lower conduction band edge. [20][21][22] However, the Fermi level (E F ) of Fe 2 O 3 is lower than that of TiO 2 . 23 Therefore, band bending may occur so that the conduction band edge of Fe 2 O 3 is higher than that of TiO 2 when their Fermi levels are equalized.…”

Section: Introductionmentioning

confidence: 99%

TiO₂/Fe₂O₃ heterostructures with enhanced photocatalytic reduction of Cr(vi) under visible light irradiation

et al. 2019

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Direct in situ synthesis of Fe2O3-codoped N-doped TiO2 nanoparticles with enhanced photocatalytic and photo-electrochemical properties

Cited by 34 publications

References 53 publications

Photoelectrochemical Water Splitting by In₂S₃/In₂O₃ Composite Nanopyramids

Photoelectrochemical Water Splitting by In₂S₃/In₂O₃ Composite Nanopyramids

Nitrogen-Doped Ni/TiO₂ Catalyst with Enhanced Activity and Improved Selectivity for CO₂ Methanation

TiO₂/Fe₂O₃ heterostructures with enhanced photocatalytic reduction of Cr(vi) under visible light irradiation

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Direct in situ synthesis of Fe2O3-codoped N-doped TiO2 nanoparticles with enhanced photocatalytic and photo-electrochemical properties

Cited by 34 publications

References 53 publications

Photoelectrochemical Water Splitting by In2S3/In2O3 Composite Nanopyramids

Photoelectrochemical Water Splitting by In2S3/In2O3 Composite Nanopyramids

Nitrogen-Doped Ni/TiO2 Catalyst with Enhanced Activity and Improved Selectivity for CO2 Methanation

TiO2/Fe2O3 heterostructures with enhanced photocatalytic reduction of Cr(vi) under visible light irradiation

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Product

Resources

About

Photoelectrochemical Water Splitting by In₂S₃/In₂O₃ Composite Nanopyramids

Photoelectrochemical Water Splitting by In₂S₃/In₂O₃ Composite Nanopyramids

Nitrogen-Doped Ni/TiO₂ Catalyst with Enhanced Activity and Improved Selectivity for CO₂ Methanation

TiO₂/Fe₂O₃ heterostructures with enhanced photocatalytic reduction of Cr(vi) under visible light irradiation