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Patrocinio KL, Santos JR, Granone LI, Ponce MA, Churio MS, Ribeiro LK, Teodoro MD, Llusar R, Andrés J, Longo E, Assis M. Tuning the morphology to enhance the catalytic activity of α-Ag 2WO 4 through V-doping. Dalton Trans 2023; 52:14982-14994. [PMID: 37811730 DOI: 10.1039/d3dt02352d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
Here, we present the synthesis of a highly efficient V-doped α-Ag2WO4 catalyst for the oxidation of sulfides to sulfones, exhibiting a high degree of tolerance towards various sensitive functional groups. Remarkably, the catalysts with 0.01% V-doping content exhibited outstanding selectivity towards the oxidation process. Scavenger experiments indicated the direct involvement of electron-hole (e-/h+) pairs, hydroxyl radical (˙OH), and singlet oxygen (1O2) in the catalytic mechanism. Based on the experimental and theoretical results, the higher activity of the V-doped α-Ag2WO4 samples was associated with the preferential formation of the (100) surface in the catalyst morphology.
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Affiliation(s)
- Katiana Lima Patrocinio
- CDMF-UFSCar, Universidade Federal de São Carlos, P.O. Box 676, CEP, 13565-905, São Carlos, SP, Brazil
| | - Jeziel Rodrigues Santos
- CDMF-UFSCar, Universidade Federal de São Carlos, P.O. Box 676, CEP, 13565-905, São Carlos, SP, Brazil
| | - Luis Ignacio Granone
- Departamento de Química y Bioquímica, Facultad de Ciencias Exactas y Naturales, Instituto de Investigaciones Físicas de Mar del Plata (IFIMAR), CONICET, Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, 7600, Argentina
| | - Miguel Adolfo Ponce
- Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, 7600, Argentina
- Physics and Engineering Research Center CIFICEN (CICPBA-CONICET), National University of the Center of the Province of Buenos Aires (UNCPBA), Tandil, B7000GHG, Argentina
| | - Maria Sandra Churio
- Departamento de Química y Bioquímica, Facultad de Ciencias Exactas y Naturales, Instituto de Investigaciones Físicas de Mar del Plata (IFIMAR), CONICET, Universidad Nacional de Mar del Plata (UNMdP), Mar del Plata, 7600, Argentina
| | - Lara Kelly Ribeiro
- CDMF-UFSCar, Universidade Federal de São Carlos, P.O. Box 676, CEP, 13565-905, São Carlos, SP, Brazil
- Department of Analytical and Physical Chemistry, University Jaume I (UJI), Castelló, 12071, Spain.
| | - Marcio Daldin Teodoro
- Department of Physics, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil
| | - Rosa Llusar
- Department of Analytical and Physical Chemistry, University Jaume I (UJI), Castelló, 12071, Spain.
| | - Juan Andrés
- Department of Analytical and Physical Chemistry, University Jaume I (UJI), Castelló, 12071, Spain.
| | - Elson Longo
- CDMF-UFSCar, Universidade Federal de São Carlos, P.O. Box 676, CEP, 13565-905, São Carlos, SP, Brazil
| | - Marcelo Assis
- Department of Analytical and Physical Chemistry, University Jaume I (UJI), Castelló, 12071, Spain.
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Yatheendran A, Rajan R, Sandhyarani N. Synergistic Effect of Oxygen Vacancy-Rich SnO 2 and AgCl in the Augmentation of Sustained Oxygen Reduction Reaction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:11708-11719. [PMID: 37439197 DOI: 10.1021/acs.langmuir.3c01311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
Developing a stable and methanol-tolerant electrocatalyst for a sustained oxygen reduction reaction (ORR) is of great importance for advancing direct methanol fuel cell applications. The silver-based electrocatalysts are particularly interesting among the promising non-Pt-based electrocatalysts for ORR. Herein, we report a single-step synthesis of a composite of AgCl and SnO2 with oxygen vacancy (AgCl-SnO2(VO)), which exhibits sustained and selective catalytic activity for the ORR along with excellent durability. Hydrothermal synthesis generates oxygen vacancies within the material and facilitates a strong interaction between AgCl and SnO2(VO), which effectively augments the ORR activity and the long-term stability of the composite. The composite exhibits remarkable methanol tolerance, as evidenced by a meager shift of only 0.002 V in the half-wave potential. Furthermore, the composite demonstrates excellent durability, with no noticeable changes in onset and half-wave potential even after 2500 cycles. The cost-effectiveness, durability, and ORR selectivity of this composite hold great promise toward contributing to the advancement of clean energy technology.
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Affiliation(s)
- Anagha Yatheendran
- Nanoscience Research Laboratory, School of Materials Science and Engineering, National Institute of Technology Calicut, Kozhikode, Kerala, India 673601
| | - Rahul Rajan
- Nanoscience Research Laboratory, School of Materials Science and Engineering, National Institute of Technology Calicut, Kozhikode, Kerala, India 673601
| | - N Sandhyarani
- Nanoscience Research Laboratory, School of Materials Science and Engineering, National Institute of Technology Calicut, Kozhikode, Kerala, India 673601
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A novel and durable oxygen reduction reaction catalyst with enhanced bio-energy generation in microbial fuel cells based on Ag/Ag2WO4@f-MWCNTs. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Pereira PFDS, De Foggi CC, Gouveia AF, Pinatti IM, Cabral LA, Guillamon E, Sorribes I, San-Miguel MA, Vergani CE, Simões AZ, da Silva EZ, Cavalcante LS, Llusar R, Longo E, Andrés J. Disclosing the Biocide Activity of α-Ag2−2xCuxWO4 (0 ≤ x ≤ 0.16) Solid Solutions. Int J Mol Sci 2022; 23:ijms231810589. [PMID: 36142511 PMCID: PMC9504239 DOI: 10.3390/ijms231810589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 08/31/2022] [Accepted: 09/06/2022] [Indexed: 02/02/2023] Open
Abstract
In this work, α-Ag2−2xCuxWO4 (0 ≤ x ≤ 0.16) solid solutions with enhanced antibacterial (against methicillin-resistant Staphylococcus aureus) and antifungal (against Candida albicans) activities are reported. A plethora of techniques (X-ray diffraction with Rietveld refinements, inductively coupled plasma atomic emission spectrometry, micro-Raman spectroscopy, attenuated total reflectance–Fourier transform infrared spectroscopy, field emission scanning electron microscopy, ultraviolet–visible spectroscopy, photoluminescence emissions, and X-ray photoelectron spectroscopy) were employed to characterize the as-synthetized samples and determine the local coordination geometry of Cu2+ cations at the orthorhombic lattice. To find a correlation between morphology and biocide activity, the experimental results were sustained by first-principles calculations at the density functional theory level to decipher the cluster coordinations and electronic properties of the exposed surfaces. Based on the analysis of the under-coordinated Ag and Cu clusters at the (010) and (101) exposed surfaces, we propose a mechanism to explain the biocide activity of these solid solutions.
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Affiliation(s)
- Paula Fabiana dos Santos Pereira
- CDMF, LIEC, Department of Chemistry, Federal University of São Carlos (UFSCar), P.O. Box 676, São Carlos 13565-905, SP, Brazil
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
| | - Camila Cristina De Foggi
- Department of Conservative Dentistry, Faculty of Dental Sciences, Federal University of Rio Grande do Sul, Rio Grande do Sul 90035-004, RS, Brazil
| | - Amanda Fernandes Gouveia
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
- Institute of Chemistry, State University of Campinas (Unicamp), Campinas 13083-859, SP, Brazil
| | - Ivo Mateus Pinatti
- Department of Chemistry, Federal University of Maranhao, Avenida dos Portugueses, 1966, São Luís 65080-805, MA, Brazil
| | - Luís Antônio Cabral
- Institute of Physics, “Gleb Wataghin” (IFGW), State University of Campinas, Campinas 13083-859, SP, Brazil
| | - Eva Guillamon
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
| | - Iván Sorribes
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
| | - Miguel A. San-Miguel
- Institute of Chemistry, State University of Campinas (Unicamp), Campinas 13083-859, SP, Brazil
| | - Carlos Eduardo Vergani
- Departamento de Materiais Odontológicos e Prótese, Faculdade de Odontologia de Araraquara, São Paulo State University (UNESP), P.O. Box 1680, Araraquara 14801-903, SP, Brazil
| | - Alexandre Zirpoli Simões
- Faculty of Engineering of Guaratinguetá, São Paulo State University (UNESP), Guaratinguetá 12516-410, SP, Brazil
| | - Edison Z. da Silva
- Institute of Physics, “Gleb Wataghin” (IFGW), State University of Campinas, Campinas 13083-859, SP, Brazil
| | - Laécio Santos Cavalcante
- PPGQ-GERATEC, Universidade Estadual do Piauí, Rua: João Cabral, N. 2231, P.O. Box 381, Teresina 64002-150, PI, Brazil
| | - Rosa Llusar
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
| | - Elson Longo
- CDMF, LIEC, Department of Chemistry, Federal University of São Carlos (UFSCar), P.O. Box 676, São Carlos 13565-905, SP, Brazil
| | - Juan Andrés
- Department of Physical and Analytical Chemistry, University Jaume I (UJI), 12071 Castelló, Spain
- Correspondence:
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Rakshitha R, Gurupadayya B, Devi SHK, Pallavi N. Coprecipitation aided synthesis of bimetallic silver tungstate: a response surface simulation of sunlight-driven photocatalytic removal of 2,4-dichlorophenol. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:59433-59443. [PMID: 35386079 DOI: 10.1007/s11356-022-20062-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 03/29/2022] [Indexed: 06/14/2023]
Abstract
In the present study, the response surface methodology (RSM) model was used to investigate the photocatalytic performance of silver tungstate (Ag2WO4) in the removal of 2,4-dichlorophenol (2,4-DCP) under natural sunlight. The Ag2WO4 which has nanoflower-like structure was synthesized by a coprecipitation method. The synthesized photocatalyst was characterized for FESEM, TEM, EDX, XRD, FTIR, and UV-Vis spectroscopy. RSM was employed to scrutinize the suitable model to yield a profound pollutant removal rate. The four independent factors such as pollutant concentration, catalyst dosage, pH, and contact time are simulated using RSM. A total of 91% of 2,4-DCP degradation was achieved at a higher catalyst dosage and lower pollutant concentration with a contact duration of 8 h in an alkaline pH condition. The coefficient of regression (R2) and probability value (P) were 0.98 and 0.0472, respectively, which confirmed the ideality of RSM modeling. The study discusses on the possible photocatalytic degradation mechanisms of 2,4-DCP. The results showed a significant dependence of the photocatalytic removal of 2,4-DCP on the functional parameters.
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Affiliation(s)
- Rajashekara Rakshitha
- Department of Environmental Science, Faculty of Natural Science, JSS Academy of Higher Education and Research, Mysuru, 570015, India
| | - Bannimath Gurupadayya
- Department of Pharmaceutical Chemistry, JSS Academy of Higher Education and Research, JSS College of Pharmacy, Mysuru, 570015, India
| | | | - Nagaraju Pallavi
- Department of Environmental Science, Faculty of Natural Science, JSS Academy of Higher Education and Research, Mysuru, 570015, India.
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Abstract
Hydrogen fuel cell technology is an essential component of a green economy. However, it is limited in practicality and affordability by the oxygen reduction reaction (ORR). Nanoscale silver particles have been proposed as a cost-effective solution to this problem. However, previous computational studies focused on clean and flat surfaces. High-index surfaces can be used to model active steps presented in nanoparticles. Here, we used the stable stepped Ag(322) surface as a model to understand the ORR performance of steps on Ag nanoparticles. Our density functional theory (DFT) results demonstrate a small dissociation energy barrier for O2 molecules on the Ag(322) surface, which can be ascribed to the existence of low-coordination number surface atoms. Consequently, the adsorption of OOH* led to the associative pathway becoming ineffective. Alternatively, the unusual dissociative mechanism is energetically favored on Ag(322) for ORR. Our findings reveal the importance of the coordination numbers of active sites for catalytic performance, which can further guide electrocatalysts’ design.
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Vinoth S, Govindasamy M, Wang SF. Solvothermal synthesis of silver tungstate integrated with carbon nitrides matrix composites for highly sensitive electrochemical nitrofuran derivative sensing in biological samples. Anal Chim Acta 2021; 1192:339355. [DOI: 10.1016/j.aca.2021.339355] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 11/30/2021] [Accepted: 12/01/2021] [Indexed: 11/27/2022]
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