Implementation of heteroatom-doped nanomaterial/core–shell nanostructure based electrocatalysts for fuel cells and metal-ion/air/sulfur batteries

Nagappan, Saravanan; Duraivel, Malarkodi; Park, NaHyun; Prabakar, Kandasamy; Park, Kang Hyun

doi:10.1039/d2ma00390b

Cited by 11 publications

(5 citation statements)

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“…Using the following equation ( 1), all potentials were calibrated to a reversible hydrogen electrode [24,26].…”

Section: Catalyst Ink Preparation and Electrochemical Measurementsmentioning

confidence: 99%

“…The Koutecky-Levich equation can be used to calculate the number of electron transfers per oxygen molecule involved in oxygen reduction based on Equations ( 2)-(4) [24,26].…”

Section: Catalyst Ink Preparation and Electrochemical Measurementsmentioning

confidence: 99%

“…At the same, the major drawbacks of using Pt-based noble metals are poorer tolerance and stability as well as being expensive [25]. Significant attention is also paid to the introduction of heteroatoms such as nitrogen (N), phosphorous (P), sulfur (S), and boron (B) to the graphene materials, which can reduce the cost of the electrocatalyst and enhance the tolerance and stability against alcohols [16,24,[26][27][28][29][30]. Some carbon electrodes have achieved 4e-and 2e-ORR catalytic efficiency comparable to that of these noble metal catalysts under alkaline conditions [5,[31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

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Electrocatalytic Oxygen Reduction Reaction of Graphene Oxide and Metal-Free Graphene in an Alkaline Medium

et al. 2023

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Graphene is a well-known two-dimensional material with a large surface area and is used for numerous applications in a variety of fields. Metal-free carbon materials such as graphene-based materials are widely used as an electrocatalyst for oxygen reduction reactions (ORRs). Recently, more attention has been paid to developing metal-free graphenes doped with heteroatoms such as N, S, and P as efficient electrocatalysts for ORR. In contrast, we found our prepared graphene from graphene oxide (GO) by the pyrolysis method under a nitrogen atmosphere at 900 °C has shown better ORR activity in aqueous 0.1 M potassium hydroxide solution electrolyte as compared with the electrocatalytic activity of pristine GO. At first, we prepared various graphene by pyrolysis of 50 mg and 100 mg of GO in one to three alumina boats and pyrolyzed the samples under a N2 atmosphere at 900 °C. The prepared samples are named G50-1B to 3B and G100-1B and G100-2B. The prepared GO and graphenes were also analyzed under various characterization techniques to confirm their morphology and structural integrity. The obtained results suggest that the ORR electrocatalytic activity of graphene may differ based on the pyrolysis conditions. We found that G100-1B (Eonset, E1/2, JL, and n values of 0.843, 0.774, 4.558, and 3.76) and G100-2B (Eonset, E1/2, and JL values of 0.837, 0.737, 4.544, and 3.41) displayed better electrocatalytic ORR activity, as did Pt/C electrode (Eonset, E1/2, and JL values of 0.965, 0.864, 5.222, and 3.71, respectively). These results display the wide use of the prepared graphene for ORR and also can be used for fuel cell and metal–air battery applications.

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“…Using the following equation ( 1), all potentials were calibrated to a reversible hydrogen electrode [24,26].…”

Section: Catalyst Ink Preparation and Electrochemical Measurementsmentioning

confidence: 99%

“…The Koutecky-Levich equation can be used to calculate the number of electron transfers per oxygen molecule involved in oxygen reduction based on Equations ( 2)-(4) [24,26].…”

Section: Catalyst Ink Preparation and Electrochemical Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrocatalytic Oxygen Reduction Reaction of Graphene Oxide and Metal-Free Graphene in an Alkaline Medium

et al. 2023

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“…In view of this, it is necessary to develop efficient non-precious-metalgroup (non-PMG) bifunctional electrocatalysts employed in ZABs for the reasonable and effective energy utilization. [11][12][13] Recently, nitrogen-doped carbon (NC)supported transition metal materials, especially Fe-N X -C single-atom catalysts (SACs, x refers to the coordination number), have been widely investigated as one of the most promising electrocatalysts toward ORR and OER, which possess the advantages of cost-effectiveness, regulated atomic structure, outstanding electronic properties, and comparable catalytic activities to conventional platinum-metal-group (PMG) catalysts. [14,15] It has been widely reported that N-doped graphene is an ideal carrier for the anchorage and stability of Fe center by coordinating with 4 adjacent N atoms, forming Fe-N 4 sites in Fe-N X -C SACs to improve catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

3D Hollow Hierarchical Porous Carbon with Fe‐N₄‐OH Single‐Atom Sites for High‐Performance Zn‐Air Batteries

Zhou,

Chen,

Xia

et al. 2023

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The development of innovative and efficient Fe‐N‐C catalysts is crucial for the widespread application of zinc‐air batteries (ZABs), where the inherent oxygen reduction reaction (ORR) activity of Fe single‐atom sites needs to be optimized to meet the practical application. Herein, a three‐dimensional (3D) hollow hierarchical porous electrocatalyst (ZIF8@FePMPDA‐920) rich in asymmetric Fe‐N4‐OH moieties as the single atomic sites is reported. The Fe center is in a penta‐coordinated geometry with four N atoms and one O atom to form Fe‐N4‐OH configuration. Compared to conventional Fe‐N4 configuration, this unique structure can weaken the adsorption of intermediates by reducing the electron density of the Fe center for oxygen binding, which decreases the energy barrier of the rate‐determining steps (RDS) to accelerate the ORR and oxygen evolution reaction (OER) processes for ZABs. The rechargeable liquid ZABs (LZABs) equipped with ZIF8@FePMPDA‐920 display a high power density of 123.11 mW cm−2 and a long cycle life (300 h). The relevant flexible all‐solid‐state ZABs (FASSZABs) also display outstanding foldability and cyclical stability. This work provides a new perspective for the structural design of single‐atom catalysts in the energy conversion and storage areas.

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“…In recent years, the theoretical researchers have examined the various pathways for ORR on surfaces of carbon based nanocatalysts to identify their active positions and suitable sites and to nd the possible pathways from thermodynamic and kinetics perspectives [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Silicon nanocages as effective catalysts for oxygen reduction reaction

Chuanyong

Wei

Chen

et al. 2023

Preprint

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Here, the catalytic activity of Fe-C44 and Fe-Si44 for oxygen reduction reaction by effective mechanisms are examined. The nanocatalysts (Fe-C44 and Fe-Si44) for ORR mechanisms are suggested and results are compared with Pt-based catalysts. Results indicated that the H2O on surfaces of Fe-C44 and Fe-Si44 nanocages are physically absorbed and it means that H2O is easily desorbed from Fe-C44 and Fe-Si44 nanocages. The adsorption OOH on Fe-C44 and Fe-Si44 nanocages has higher Eadsorption than O2 adsorption and also dissociation of O2 molecules on Fe-C44 and Fe-Si44 nanocages has high activation barrier energy. The nanocage-*OH, nanocage-*OH and H2O and nanocage-*O and H2O formation are rate-determining steps in mechanisms 1, 2 and 3. It can be demonstrated that pathway 1 is effective mechanism for ORR on Fe-C44 and Fe-Si44 nanocages. Results shown that the overpotential of ORR on Fe-C44 and Fe-Si44 nanocages are lower than Pt catalysts.

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Implementation of heteroatom-doped nanomaterial/core–shell nanostructure based electrocatalysts for fuel cells and metal-ion/air/sulfur batteries

Abstract: This review article deeply focuses on the use of heteroatom-doped nanomaterials and core–shell nanostructures for various kinds of fuel cell and battery applications.

Cited by 11 publications

References 306 publications

Electrocatalytic Oxygen Reduction Reaction of Graphene Oxide and Metal-Free Graphene in an Alkaline Medium

Electrocatalytic Oxygen Reduction Reaction of Graphene Oxide and Metal-Free Graphene in an Alkaline Medium

3D Hollow Hierarchical Porous Carbon with Fe‐N₄‐OH Single‐Atom Sites for High‐Performance Zn‐Air Batteries

Silicon nanocages as effective catalysts for oxygen reduction reaction

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Implementation of heteroatom-doped nanomaterial/core–shell nanostructure based electrocatalysts for fuel cells and metal-ion/air/sulfur batteries

Abstract: This review article deeply focuses on the use of heteroatom-doped nanomaterials and core–shell nanostructures for various kinds of fuel cell and battery applications.

Cited by 11 publications

References 306 publications

Electrocatalytic Oxygen Reduction Reaction of Graphene Oxide and Metal-Free Graphene in an Alkaline Medium

Electrocatalytic Oxygen Reduction Reaction of Graphene Oxide and Metal-Free Graphene in an Alkaline Medium

3D Hollow Hierarchical Porous Carbon with Fe‐N4‐OH Single‐Atom Sites for High‐Performance Zn‐Air Batteries

Silicon nanocages as effective catalysts for oxygen reduction reaction

Contact Info

Product

Resources

About

3D Hollow Hierarchical Porous Carbon with Fe‐N₄‐OH Single‐Atom Sites for High‐Performance Zn‐Air Batteries