Optimization of cobalt on CNT towards the oxygen evolution reaction and its synergy with iron (II) phthalocyanine as bifunctional oxygen electrocatalyst

Morais, R.G.; Rey‐Raap, Natalia; Figueiredo, José; Pereira, M. Fernando R.

doi:10.1016/j.cattod.2023.114057

Cited by 9 publications

(3 citation statements)

References 53 publications

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“…The scans were performed from 5 to 90° with a 0.02° step and 3 s of acquisition time. The electrochemically active surface area ( ECSA ) is commonly calculated by dividing the double-layer capacitance ( Cdl ) by the specific capacitance of a reference material ( Cs ) [ 53 , 54 ], as shown in the SI. All samples of this study are of the same nature, so Cs should have the same value for all GA, meaning that the trend of the Cdl values could be equivalent to that of ECSA.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Ni-Doped Graphene Aerogels for Electrochemical Applications

González-Barriuso,

Sánchez-Suárez,

González-Lavín

et al. 2024

Gels

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Carbonaceous materials used in most electrochemical applications require high specific surface area, adequate pore size distribution, and high electrical conductivity to ensure good interaction with the electrolyte and fast electron transport. The development of transition metal doped graphene aerogels is a possible solution, since their structure, morphology, and electrical properties can be controlled during the synthesis process. This work aims to synthesize Ni-doped graphene aerogels to study the role of different nickel salts in the sol-gel reaction and their final properties. The characterization data show that, regardless of the nature of the Ni salts, the surface area, volume of micropores, and enveloped density decrease, while the porosity and electrical conductivity increase. However, differences in morphology, mesopore size distribution, degree of order of the carbon structure, and electrical conductivity were observed depending on the type of Ni salt. It was found that nickel nitrate results in a material with a broader mesopore distribution, higher electrical conductivity, and hence, higher electrochemical surface area, demonstrating that graphene aerogels can be easily synthesized with tailored properties to fit the requirements of specific electrochemical applications.

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Section: Methodsmentioning

confidence: 99%

Synthesis of Ni-Doped Graphene Aerogels for Electrochemical Applications

González-Barriuso,

Sánchez-Suárez,

González-Lavín

et al. 2024

Gels

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“…The experiment was recorded within linear range 50 to 750 nmol L −1 with detection limits of 19 nmol L −1 . Additionally, carbon-based materials, such as carbon nanotubes (CNTs), mesoporous, graphene, and nanocarbons, etc., exhibited sustain electrocatalytic activity and stability due to their large specific surface area, high electrical conductivity, and tunable physicochemical properties in electrochemical applications [203]. Despite these advantages, carbon-based materials majorly suffer from aggregation issues, poor dispersibility, limited pore size, surface defects, biocompatibility concerns, and high production costs [202].…”

Section: Dopamine Biosensorsmentioning

confidence: 99%

Macromolecule–Nanoparticle-Based Hybrid Materials for Biosensor Applications

Kuntoji,

Kousar,

Gaddimath

et al. 2024

Biosensors

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Biosensors function as sophisticated devices, converting biochemical reactions into electrical signals. Contemporary emphasis on developing biosensor devices with refined sensitivity and selectivity is critical due to their extensive functional capabilities. However, a significant challenge lies in the binding affinity of biosensors to biomolecules, requiring adept conversion and amplification of interactions into various signal modalities like electrical, optical, gravimetric, and electrochemical outputs. Overcoming challenges associated with sensitivity, detection limits, response time, reproducibility, and stability is essential for efficient biosensor creation. The central aspect of the fabrication of any biosensor is focused towards forming an effective interface between the analyte electrode which significantly influences the overall biosensor quality. Polymers and macromolecular systems are favored for their distinct properties and versatile applications. Enhancing the properties and conductivity of these systems can be achieved through incorporating nanoparticles or carbonaceous moieties. Hybrid composite materials, possessing a unique combination of attributes like advanced sensitivity, selectivity, thermal stability, mechanical flexibility, biocompatibility, and tunable electrical properties, emerge as promising candidates for biosensor applications. In addition, this approach enhances the electrochemical response, signal amplification, and stability of fabricated biosensors, contributing to their effectiveness. This review predominantly explores recent advancements in utilizing macrocyclic and macromolecular conjugated systems, such as phthalocyanines, porphyrins, polymers, etc. and their hybrids, with a specific focus on signal amplification in biosensors. It comprehensively covers synthetic strategies, properties, working mechanisms, and the potential of these systems for detecting biomolecules like glucose, hydrogen peroxide, uric acid, ascorbic acid, dopamine, cholesterol, amino acids, and cancer cells. Furthermore, this review delves into the progress made, elucidating the mechanisms responsible for signal amplification. The Conclusion addresses the challenges and future directions of macromolecule-based hybrids in biosensor applications, providing a concise overview of this evolving field. The narrative emphasizes the importance of biosensor technology advancement, illustrating the role of smart design and material enhancement in improving performance across various domains.

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“…Transition metal phthalocyanine (TMPc)-based electrocatalysts have been of broad concern due to their low preparation cost, high conjugated structure, high thermal stability, chemical stability, and excellent catalytic performance [ 15 ]. Since 1964, cobalt phthalocyanine molecule was used as an ORR catalyst [ 16 ], TMPcs have been extensively studied as superior ORR [ 17 , 18 , 19 ], OER [ 20 , 21 , 22 ], and ORR/OER [ 23 , 24 , 25 , 26 ] difunctional catalysts. Transition metal polyphthalocynine complexes (TMPPc) formed by multiple TMPcs show better conductivity, stability, and electrocatalytic activity than that of TMPc monomers.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study on ORR/OER Bifunctional Catalytic Activity of Axial Functionalized Iron Polyphthalocyanine

Wang,

Feng,

Ren

et al. 2023

Molecules

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Designing efficient ORR/OER bifunctional electrocatalysts is very significant for reducing energy consumption and environmental protection. Hence, we studied the ORR/OER bifunctional catalytic activity of iron polyphthalocyanine (FePPc) coordinated by a series of axial ligands which has different electronegative coordination atom (FePPc-L) (L = -CN, -SH, -SCH3, -SC2H5, -I, -Br, -NH2, -Cl, -OCH3, -OH, and -F) in alkaline medium by DFT calculations. Among all FePPc-L, FePPc-CN, FePPc-SH, FePPc-SCH3, and FePPc-SC2H5 exhibit excellent ORR/OER bifunctional catalytic activities. Their ORR/OER overpotential is 0.256 V/0.234 V, 0.278 V/0.256 V, 0.280 V/0.329 V, and 0.290 V/0.316 V, respectively, which are much lower than that of the FePPc (0.483 V/0.834 V). The analysis of the electronic structure of the above catalysts shows that the electronegativity of the coordination atoms in the axial ligand is small, resulting in less distribution of dz2, dyz, and dxz orbitals near Ef, weak orbital polarization, small charge and magnetic moment of the central Fe atom, and weak adsorption strength for *OH. All these prove that the introduction of axial ligands with appropriate electronegativity coordinating atoms can adjust the adsorption of catalyst to intermediates and modify the ORR/OER bifunctional catalytic activities. This is an effective strategy for designing efficient ORR/OER bifunctional electrocatalysts.

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Optimization of cobalt on CNT towards the oxygen evolution reaction and its synergy with iron (II) phthalocyanine as bifunctional oxygen electrocatalyst

Cited by 9 publications

References 53 publications

Synthesis of Ni-Doped Graphene Aerogels for Electrochemical Applications

Synthesis of Ni-Doped Graphene Aerogels for Electrochemical Applications

Macromolecule–Nanoparticle-Based Hybrid Materials for Biosensor Applications

Theoretical Study on ORR/OER Bifunctional Catalytic Activity of Axial Functionalized Iron Polyphthalocyanine

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