Copper pyrovanadate electrodes prepared by combustion synthesis: evaluation of photoelectroactivity

Camargo, Luan Pereira; Lucilha, Adriana Campano; Gomes, Guilherme Augusto Barros; Liberatti, Vanessa Moraes; Andrello, Avacir Casanova; Silva, Paulo Rogério Catarini da; Dall’Antônia, Luiz Henrique

doi:10.1007/s10008-020-04721-z

Cited by 15 publications

(27 citation statements)

References 56 publications

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“…The CuÀ VÀ O compound family has generated intense interest from the PEC solar fuel community. [3][4][5][6][13][14][15][16][17][18][19][20][21] [3][4][5][6][13][14][15][16][17][18][19][20][21] with significantly higher stability in a water splitting environment relative to their binary oxide (CuO and V 2 O 5 ) constituents. Notwithstanding the intrinsic advantages of electrosynthesis as noted earlier, the use of this approach for synthesizing copper vanadate films, however, has been conspicuous by its absence.…”

Section: Introductionmentioning

confidence: 99%

“…The Cu−V−O compound family has generated intense interest from the PEC solar fuel community [3–6,13–21] . Combining V 2 O 5 and CuO in different stoichiometries generates a series of ternary copper(II) vanadates (CuV 2 O 6 , Cu 2 V 2 O 7 , Cu 3 V 2 O 8 , Cu 11 V 6 O 26 , and Cu 5 V 2 O 10 ) [3–6,13–21] with significantly higher stability in a water splitting environment relative to their binary oxide (CuO and V 2 O 5 ) constituents. Notwithstanding the intrinsic advantages of electrosynthesis as noted earlier, the use of this approach for synthesizing copper vanadate films, however, has been conspicuous by its absence.…”

Section: Introductionmentioning

confidence: 99%

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Combining Electrosynthesis with Thermolysis: A Safe/Scalable Route to Multinary Oxide Semiconductor Films

et al. 2021

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Adding a thermolysis step to electrosynthesis (as in "electrothermosynthesis") considerably enhances the scope of electrochemical film deposition and affords multinary compositions previously inaccessible by this otherwise versatile and mild synthetic approach. Copper pyrovanadate (βÀ Cu 2 V 2 O 7 ), a mem-ber of the CuÀ VÀ O family of ternary oxide semiconductors that are of considerable interest to the solar fuel community, is shown herein to be an exemplar of this approach. Finally, the generality of the hybrid approach is discussed for a variety of ternary metal oxides.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Combining Electrosynthesis with Thermolysis: A Safe/Scalable Route to Multinary Oxide Semiconductor Films

et al. 2021

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“…The photogenerated holes ( h + VB ) on the photoelectrode surface will give rise to hydroxyl radicals ( • OH) from the reaction with the water [ 28 , 29 ]. At the same time, the applied potential minimizes the natural recombination of the e − CB / h + VB in semiconductors [ 28 , 29 , 30 ]. In this sense, in a PEC system, dopamine detection can occur from the analyte oxidation with the hydroxyl radicals and by the electrochemical oxidation (electrode surface) [ 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Visible Light Photoelectrochemical Sensor for Dopamine: Determination Using Iron Vanadate Modified Electrode

et al. 2022

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This study reports a facile approach for constructing low-cost and remarkable electroactivity iron vanadate (Fe-V-O) semiconductor material to be used as a photoelectrochemical sensor for dopamine detection. The structure and morphology of the iron vanadate obtained by the Successive Ionic Adsorption and Reaction process were critically characterized, and the photoelectrochemical characterization showed a high photoelectroactivity of the photoanode in visible light irradiation. Under best conditions, dopamine was detected by chronoamperometry at +0.35 V vs. Ag/AgCl, achieving two linear response ranges (between 1.21 and 30.32 μmol L−1, and between 30.32 and 72.77 μmol L−1). The limits of detection and quantification were 0.34 and 1.12 μmol L−1, respectively. Besides, the accuracy of the proposed electrode was assessed by determining dopamine in artificial cerebrospinal fluid, obtaining recovery values ranging from 98.7 to 102.4%. The selectivity was also evaluated by dopamine detection against several interferent species, demonstrating good precision and promising application for the proposed method. Furthermore, DFT-based electronic structure calculations were also conducted to help the interpretation. The dominant dopamine species were determined according to the experimental conditions, and their interaction with the iron vanadate photoanode was proposed. The improved light-induced DOP detection was likewise evaluated regarding the charge transfer process.

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“…Of course, the persistent population growth aligned with the fast industrial expansion also brought serious environmental problems; currently, the water pollution by synthetic organic dyes is one of the biggest reasons for concern [1][2][3][4]. As is well-known, about 7 × 10 5 tons of synthetic organic dyes are annually used by the textile industry [4,5].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic and Photoluminescence Properties Resulting from Type-I Band Alignment in the Zn2GeO4/g-C3N4 Nanocomposites

et al. 2022

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Well-defined Zn2GeO4/g-C3N4 nanocomposites with a band alignment of type-I were prepared by the ultrasound-assisted solvent method, starting from g-C3N4 nanosheets and incorporating 0, 10, 20, and 40 wt% of Zn2GeO4. In this study, we have investigated in-depth the photoluminescence emission and photocatalytic activity of these nanocomposites. Our experimental results showed that an increased mass ratio of Zn2GeO4 to g-C3N4 can significantly improve their photoluminescence and photocatalytic responses. Additionally, we have noted that the broadband photoluminescence (PL) emission for these nanocomposites reveals three electronic transitions; the first two well-defined transitions (at ca. 450 nm and 488 nm) can be attributed to π*→ lone pair (LP) and π*→π transitions of g-C3N4, while the single shoulder at ca. 532 nm is due to the oxygen vacancy (Vo) as well as the hybridization of 4s and 4p orbital states in the Zn and Ge belonging to Zn2GeO4. These experimental findings are also supported by theoretical calculations performed under periodic conditions based on the density functional theory (DFT) fragment. The theoretical findings for these nanocomposites suggest a possible strain-induced increase in the Zn-O bond length, as well as a shortening of the Ge-O bond of both tetrahedral [ZnO4] and [GeO4] clusters, respectively. Thus, this disordered structure promotes local polarization and a charge gradient in the Zn2GeO4/g-C3N4 interface that enable an efficient separation and transfer of the photoexcited charges. Finally, theoretical results show a good correlation with our experimental data.

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Copper pyrovanadate electrodes prepared by combustion synthesis: evaluation of photoelectroactivity

Cited by 15 publications

References 56 publications

Combining Electrosynthesis with Thermolysis: A Safe/Scalable Route to Multinary Oxide Semiconductor Films

Combining Electrosynthesis with Thermolysis: A Safe/Scalable Route to Multinary Oxide Semiconductor Films

Visible Light Photoelectrochemical Sensor for Dopamine: Determination Using Iron Vanadate Modified Electrode

Enhanced Photocatalytic and Photoluminescence Properties Resulting from Type-I Band Alignment in the Zn2GeO4/g-C3N4 Nanocomposites

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