Controlled synthesis of graphene via electrochemical route and its use as efficient metal-free catalyst for oxygen reduction

Komba, Nathanael; Zhang, Gaixia; Rosei, Federico; Sun, Shuhui

doi:10.1016/j.apcatb.2018.10.070

Cited by 40 publications

(14 citation statements)

References 39 publications

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“…Carbon electrocatalysts have been widely studied for ORR because of their low cost, good conductivity and high stability 905 . As one of the most attractive 2D materials, graphene-derived materials have been applied as active ORR electrocatalysts through decorating and heteroatom doping 906,907 . Loading metal particles or single atoms (SAs) on graphene substrates with huge specific surface area and excellent conductivity is a good strategy to obtain high ORR performance.…”

Section: Oxygen Reduction Reactionmentioning

confidence: 99%

Recent Progress on Two-Dimensional Materials

Chang¹,

Chen²,

Chen³

et al. 2021

Acta Physico Chimica Sinica

328

119

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Research on two-dimensional (2D) materials has been explosively increasing in last seventeen years in varying subjects including condensed matter physics, electronic engineering, materials science, and chemistry since the mechanical exfoliation of graphene in 2004. Starting from graphene, 2D materials now have become a big family with numerous members and diverse categories. The unique structural features and physicochemical properties of 2D materials make them one class of the most appealing candidates for a wide range of potential applications.In particular, we have seen some major breakthroughs made in the field of 2D materials in last five years not only in developing novel synthetic methods and exploring new structures/properties but also in identifying innovative applications and pushing forward commercialisation. In this review, we provide a critical summary on the recent progress made in the field of 2D materials with a particular focus on last five years. After a brief background 物理化学学报 Acta Phys. -Chim. Sin. 2021, 37 (12), 2108017 (3 of 151) introduction, we first discuss the major synthetic methods for 2D materials, including the mechanical exfoliation, liquid exfoliation, vapor phase deposition, and wet-chemical synthesis as well as phase engineering of 2D materials belonging to the field of phase engineering of nanomaterials (PEN). We then introduce the superconducting/optical/magnetic properties and chirality of 2D materials along with newly emerging magic angle 2D superlattices. Following that, the promising applications of 2D materials in electronics, optoelectronics, catalysis, energy storage, solar cells, biomedicine, sensors, environments, etc. are described sequentially. Thereafter, we present the theoretic calculations and simulations of 2D materials. Finally, after concluding the current progress, we provide some personal discussions on the existing challenges and future outlooks in this rapidly developing field.

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Section: Oxygen Reduction Reactionmentioning

confidence: 99%

Recent Progress on Two-Dimensional Materials

Chang¹,

Chen²,

Chen³

et al. 2021

Acta Physico Chimica Sinica

328

119

View full text Add to dashboard Cite

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“…Nitrogen is the most frequently used element to dope carbons for denaturalizing the surface electron distribution to induce catalytic activities . Apart from the many studies on their ORR activity, such N‐doped carbons have also been proven to be active for OER.…”

Section: Aqueous Secondary Non‐li Metal–o2 Batteriesmentioning

confidence: 99%

Toward Promising Cathode Catalysts for Nonlithium Metal–Oxygen Batteries

Mei

Liao

Liang

et al. 2019

Advanced Energy Materials

118

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The success of Li–air/O2 batteries has brought extensive attention to the development of various promising non‐Li metal–O2 batteries, such as Zn–O2, Al–O2, Mg–O2 batteries, etc., which have exhibited unique advantages, such as low production cost, high energy density, and much enhanced safety. The versatile non‐Li metal–O2 batteries provide a better opportunity for meeting the practical requirements for sustainable energy supplies in various applications. A high‐performance cathode in non‐Li metal–O2 batteries that can effectively trigger both oxygen reduction and evolution reactions and thus boost the overall battery performance is of great research interest. In this article, a comprehensive review on the development of Li‐free metal–O2 batteries and particularly focusing on the oxygen catalytic cathodes for both primary and secondary non‐Li metal–O2 batteries is carefully performed. The current challenges and potential solutions are also outlined and proposed. Through carefully selecting and rationally designing promising catalytic cathodes, a series of non‐Li metal–oxygen batteries toward practical energy storage applications are highly anticipated.

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“…Hence, the quest is focused in search of proficient alternative ORR catalysts such as thin Pt catalysts, − non-Pt/transition metal catalysts, − and metal-free/heteroatom-doped catalysts. − Among them, heteroatom doping to various carbon nanomaterials viz. graphene, − multiwalled carbon nanotubes, − porous carbon, − carbon nanofibers, and so forth − are widely explored and found best at their ORR activity with excellent stability in both alkaline and acidic environments. Heteroatom(s)-doped carbon nanomaterials are promising alternates to Pt-based catalysts owing to the boosted ORR performance, low-cost, longer cycling stability, and inertness to poisonous CO/CH 3 OH. − Nitrogen (N)-doped carbons greatly enhances the ORR activity as the higher electronegativity of N (χ3.04) significantly persuades the charge redistribution at adjoining carbon atoms in the graphitic matrices. − Further, doping of highest electronegative F atom (χ4.0) to the carbon nanomaterials creates the high charge redistribution at the adjacent edge-carbon atoms and brings more active centers benign to the efficient ORR .…”

Section: Introductionmentioning

confidence: 99%

Structurally Modulated Graphitic Carbon Nanofiber and Heteroatom (N,F) Engineering toward Metal-Free ORR Electrocatalysts for Polymer Electrolyte Membrane Fuel Cells

Akula

Sahu

2020

ACS Appl. Mater. Interfaces

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The present study designates the heteroatom (N,F)-doped various graphitic carbon nanofibers (GNFs) viz. GNF-linear segmented platelets, antlers, herringbone type, and their structural deformations from pristine fiber with many open-edge active centers as metal-free, cost-effective electrocatalysts for oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFCs). Introduction of heteroatoms to GNF frameworks enlarges the lattice spacing between graphene platelets and leads to structural modulation. The developed GNF/N–F catalysts show excellent ORR activity with insensitivity to CH3OH and demonstrated outstanding electrochemical potential cycling stability of 10,000 cycles with well-retained ORR kinetics without much loss in the activity. X-ray photoelectron spectroscopy investigation of GNF/N–F catalysts explicitly shows the highly active forms of N (pyridinic, pyrrolic, and graphitic-N) and semi-ionic, ionic C–F of F in the catalysts. The deep-rooted synergistic effect among N and F atoms creates more active centers entrenched with extensive C–C bond polarization and larger charge delocalization with larger spin density differences accomplished in GNF/N–F catalysts. Wide open-edge cavities, opened tips, and many extensively accessible facets collectively enhance the ORR activity of the GNF-H/N–F catalyst. The present study provides a deep insight into the understanding of advanced metal-free electrocatalysts for efficient ORR in PEMFCs and metal–air batteries.

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Controlled synthesis of graphene via electrochemical route and its use as efficient metal-free catalyst for oxygen reduction

Cited by 40 publications

References 39 publications

Recent Progress on Two-Dimensional Materials

Recent Progress on Two-Dimensional Materials

Toward Promising Cathode Catalysts for Nonlithium Metal–Oxygen Batteries

Structurally Modulated Graphitic Carbon Nanofiber and Heteroatom (N,F) Engineering toward Metal-Free ORR Electrocatalysts for Polymer Electrolyte Membrane Fuel Cells

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