Electrochemical properties of oxygen-enriched carbon-based nanomaterials

Meirinho, Sofia G.; Ferraria, Ana Maria; Rego, A.M. Botelho do; Fernandes, A.J.S.; Viana, Ana S.; Fernandes, João; Oliveira, M.C.

doi:10.1016/j.jelechem.2020.114420

Cited by 13 publications

(3 citation statements)

References 38 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We can see that at low voltage the number of electrons transferred for the CN is equal to 2eindicating the prevalent formation of H 2 O 2 from oxygen. This is typically observed for C materials [33]. A similar behavior is shown for the MnOx_OAR_CN; however, note that this latter sample shows superior performance compared to the Mn-free CN indicating the beneficial effect of Mn species.…”

Section: Orrsupporting

confidence: 74%

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

et al. 2020

View full text Add to dashboard Cite

Earth-abundant Mn-based oxide nanoparticles are supported on carbon nitride using two different immobilization methods and tested for the oxygen reduction reaction. Compared to the metal free CN, the immobilization of Mn oxide enhances not only the electrocatalytic activity but also the selectivity towards the 4e- reduction reaction of O2 to H2O. The XPS analysis reveals the interaction of the pyridine N species with Mn3O4 nanoparticles being particularly beneficial. This interaction is realized—although to a limited extent—when preparing the catalysts via impregnation; via the oleic acid route it is not observed. Whilst this work shows the potential of these systems to catalyze the ORR, the main limiting factor is still the poor conductivity of the support which leads to overpotential.

show abstract

Section: Orrsupporting

confidence: 74%

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The effect of electronic structure on the electrochemical activities of ZCO-NFs was studied by analyzing the redox behavior of three ZCO-NF-modified electrodes in a benchmark redox probe solution, [Fe(CN) 6 ] 3–/4– . The redox couple ferri-ferrocyanide, [Fe(CN) 6 ] 3–/4– is known to be sensitive to the electronic properties of electrode material Figure a shows the CV curves of the bare SPE, M1/SPE, M2SPE, and M3/SPE in 0.1 M KCl containing 5 mM K 3 [Fe(CN) 6 ] and K 4 [Fe(CN) 6 ] at a scan rate of 50 mV/s.…”

Section: Resultsmentioning

confidence: 99%

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

et al. 2023

View full text Add to dashboard Cite

The recent advancement in designing novel spinel nanostructures has opened virtually infinite possibilities for the development of high-performance electrochemical sensors to detect target species. The electrocatalytic activity of spinel structures can be enhanced by tuning the cation distribution; however, the role of cation distribution at tetrahedral ions on the electrochemical sensing responses has rarely been considered. Herein, the effect of cation distribution at tetrahedral sites (T d ) in the spinel nanostructure ZnCo 2 O 4 on the electrochemical sensing performance toward carbaryl (CBR) was first investigated. The ZnCo 2 O 4 nanoflake samples with different cation ratios of Zn/Co at tetrahedral sites were designed by using a facile solvothermal method. We found that a higher Zn ion content at tetrahedral sites significantly enhanced the electron transfer ability through the electrolyte/electrode interface. More interestingly, a higher Co ion ratio between octahedral sites and tetrahedral (Co Oh /Co Td ) promoted the electrochemical oxidation process of CBR with a higher catalytic rate constant (k cat ). Under optimized conditions, the ZnCo 2 O 4 -NF-based electrochemical nanosensor showed a linear response from 0.15 to 100 μM with a limit of detection of 0.05 μM and a high electrochemical sensitivity of 2.04 μA μM −1 cm −2 . The designed nanosensor also exhibited good repeatability, long-time stability, high anti-interference ability, and excellent recovery with fruit and vegetable samples. Furthermore, this study offers insights into the cation distribution-dependent electrocatalytic activities of spinel nanostructures, which is helpful to the design of advanced spinel nanostructure-based electrocatalysts for improving the electrochemical sensing performance.

show abstract

“…Ferrocyanide, an inner-sphere redox probe, is known to be very sensitive to the electronic properties and surface chemistry of the electrode material. 27 Figure 4a shows comparative cyclic voltammetric (CV) behaviors of bare-SPE, α-Fe 2 O 3 -T/SPE, α-Fe 2 O 3 -R/SPE, and α-Fe 2 O 3 -P/SPE in 0.1 M KCl containing 5 mM [Fe(CN) 6 ] 3−/4− at a scan rate of 50 mV.s −1 . All CV curves show a pair of well-defined redox peaks corresponding to the electron transfer of Fe 2+ reversibly into Fe 3+ and vice-versa.…”

Section: Resultsmentioning

confidence: 99%

Unraveling the Roles of Morphology and Steric Hindrance on Electrochemical Analytical Performance of α-Fe₂O₃ Nanostructures-Based Nanosensors towards Chloramphenicol Antibiotic in Shrimp Samples

Nguyen

Dinh

Doan

et al. 2022

J. Electrochem. Soc.

View full text Add to dashboard Cite

In this work, we investigated the effect of morphology on the analytical performance of α-Fe2O3 nanostructures-based electrochemical sensors toward chloramphenicol (CAP) antibiotic using three designed morphologies including α-Fe2O3 nano-tube (α-Fe2O3-T), α-Fe2O3 nano-rice (α-Fe2O3-R), and α-Fe2O3 nano-plate (α-Fe2O3-P). Among these morphologies, α-Fe2O3-T displayed an outstanding electrochemical activity owing to the unique hollow structure and large specific surface area. However, due to the small pores size, α-Fe2O3-T showed the high steric hindrance (SD) effect towards an antibiotic with complex molecular structure, as CAP, leading to a significant decrease of their CAP electrochemical sensing performance. The CAP analytical performance of α-Fe2O3-R was highest in investigated morphologies owing to a high density of exposed Fe3+ as well as less SD effect towards CAP molecules. Under optimized conditions, α-Fe2O3-R-based CAP electrochemical sensor reached an electrochemical sensitivity of 0.92 µA µM-1 cm-2 with a LOD of 0.11 µM in the detection range from 2.5 – 50 µM. In addition, all these α-Fe2O3 nanostructures-based electrochemical sensors had excellent stability and high anti-interference ability for CAP analysis in food matrix, as shrimp sample. This study provides valuable insights into the morphology-dependent sensing properties of α-Fe2O3 nanostructures towards antibiotics, which is helpful to design of novel α-Fe2O3-based electrochemical nanosensors

show abstract

Electrochemical properties of oxygen-enriched carbon-based nanomaterials

Cited by 13 publications

References 38 publications

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

Unraveling the Roles of Morphology and Steric Hindrance on Electrochemical Analytical Performance of α-Fe₂O₃ Nanostructures-Based Nanosensors towards Chloramphenicol Antibiotic in Shrimp Samples

Contact Info

Product

Resources

About

Electrochemical properties of oxygen-enriched carbon-based nanomaterials

Cited by 13 publications

References 38 publications

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo2O4 Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

Unraveling the Roles of Morphology and Steric Hindrance on Electrochemical Analytical Performance of α-Fe2O3 Nanostructures-Based Nanosensors towards Chloramphenicol Antibiotic in Shrimp Samples

Contact Info

Product

Resources

About

Insights into the Effect of Cation Distribution at Tetrahedral Sites in ZnCo₂O₄ Spinel Nanostructures on the Charge Transfer Ability and Electrocatalytic Activity toward Ultrasensitive Detection of Carbaryl Pesticide in Fruit and Vegetable Samples

Unraveling the Roles of Morphology and Steric Hindrance on Electrochemical Analytical Performance of α-Fe₂O₃ Nanostructures-Based Nanosensors towards Chloramphenicol Antibiotic in Shrimp Samples