Controlled defect formation and heteroatom doping in monolayer graphene using active oxygen species under ultraviolet irradiation

Kato, Ryuichi; Hasegawa, Masataka

doi:10.1016/j.carbon.2020.08.075

Cited by 23 publications

(8 citation statements)

References 47 publications

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“…As can be seen in the SEM images, the 5N01S‐GE30 and 5N1S‐GE30 electrodes showed the lowest optical transparency. Because the epoxy‐like spherical structures covered the layers almost completely [71,72] . L α is the nanocrystalline field size and was calculated with Tuinstra and Koenig (TK) equation (Equation (1)) [73] .…”

Section: Resultsmentioning

confidence: 99%

“…Because the epoxy-like spherical structures covered the layers almost completely. [71,72] L α is the nanocrystalline field size and was calculated with Tuinstra and Koenig (TK) equation (Equation (1)). [73] The calculated Lα values for electrodes 5N01S-GE30, 5N1S-GE30, 5N3S-GE30, 5N5S-GE10, 5S0.1N-GE40, 5S1N-GE30 and 5S3N-GE30 were 43.5, 41.2, 44.1, 46.2, 45.2, 44.4 and 42.1Nm and the number of sp2 carbon rings were calculated to be 16, 18, 17, 19, 23, 22, and 25, respectively.…”

Section: Morphological and Spectroscopic Characterization Of Cl-gesmentioning

confidence: 99%

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New Approach Synthesis of S, N Co‐Doped Graphenes for High‐Performance Supercapacitors

et al. 2022

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In this study, S, N co‐doped graphene‐based electrodes were synthesized by a one‐step, environmentally friendly and low−Cost method known as Yucel's method in the solutions consisting of different concentration ratios of sulfuric and nitric acids and different cycles in the certain potential range for the first time in the literature. The prepared S, N co‐doped graphene‐based electrodes were characterized by spectroscopic, microscopic and electrochemical methods. In electrochemical characterization, cyclic voltammetry and electrochemical impedance spectroscopy were used. The supercapacitor performances were examined by cyclic charge‐discharge tests of the electrodes in the specified supporting electrolyte solution. Areal capacitance values varied from 71.48 mF.cm−2 to 893.2 mF.cm−2 at a current density of 10 mA cm−2 in the prepared electrodes.

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Section: Resultsmentioning

confidence: 99%

Section: Morphological and Spectroscopic Characterization Of Cl-gesmentioning

confidence: 99%

New Approach Synthesis of S, N Co‐Doped Graphenes for High‐Performance Supercapacitors

et al. 2022

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“…[ 62 ] Hasegawa et al developed an ultraviolet irradiation method to controllably generate graphene defects in an oxygen atmosphere. [ 63 ] As shown in Figure a, the oxygen concentration, rather than the power of mercury lamp, is the key factor that influences the density of defects. Meanwhile, metal‐organic frameworks (MOFs), polymers, and small organic molecules are also the common precursors to form defective carbon materials, and many ingenious strategies have been designed to tune the defect density.…”

Section: Intrinsic Defects Of Graphene Boosted Electrochemical Reactionsmentioning

confidence: 99%

Section: Intrinsic Defects Of Graphene Boosted Electrochemical Reactionsmentioning

confidence: 99%

Defect‐Derived Catalysis Mechanism of Electrochemical Reactions in Two‐Dimensional Carbon Materials

Han

Yan

et al. 2023

Small Structures

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In the past decades, remarkable progress has been achieved in the exploration of electrocatalysts with high activity, long durability, and low cost. Among these, defective graphene (DG)‐based catalysts are considered as one of the most potential substitutes for precious metal‐based electrocatalysts. DG‐based catalysts contain abundant active centers with different configurations resulting from their extraordinary high‐structural tunability. Herein, an overview on recent advancements in developing four kinds of DG‐based catalysts is presented: 1) heteroatoms‐doped graphene; 2) intrinsic DG (vacancy and topological defect); 3) nonmetal atoms or/and metal species‐modified intrinsic DG (heterogeneous species and intrinsic defects co‐tuned DG); and 4) DG‐based van der Waals‐type multilayered heterostructures. In particular, the synergistic effects between various defects are discussed, and the origin of catalytic activity is reviewed. Meanwhile, the established defect‐derived catalytic mechanism is summarized, which is beneficial for the rational design and fabrication of high‐performance electrocatalysts for practical energy‐related applications. Finally, challenges and future research directions on defect engineering in noble metal‐free materials for electrocatalysis are proposed.

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“…Various strategies can be employed to create and control surface defects, such as chemical reduction, vacuum activation, ultraviolet irradiation, ball-milling, lithium-induced conversion, et al [17][18][19][20][21][22][23][24][25][26][27] However, some methods are too complicated for production. For example, the lithium-induced conversion process was often conducted by carful manual manipulation in a glove box filled with Ar.…”

mentioning

confidence: 99%

Feasible Tuning of Surface OVs on (001) TiO₂ for Superior Photocatalytic Nitrogen Fixation Activity

Bao

Zhang

et al. 2021

ChemPhysChem

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Controlled defect formation and heteroatom doping in monolayer graphene using active oxygen species under ultraviolet irradiation

Cited by 23 publications

References 47 publications

New Approach Synthesis of S, N Co‐Doped Graphenes for High‐Performance Supercapacitors

New Approach Synthesis of S, N Co‐Doped Graphenes for High‐Performance Supercapacitors

Defect‐Derived Catalysis Mechanism of Electrochemical Reactions in Two‐Dimensional Carbon Materials

Feasible Tuning of Surface OVs on (001) TiO₂ for Superior Photocatalytic Nitrogen Fixation Activity

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Controlled defect formation and heteroatom doping in monolayer graphene using active oxygen species under ultraviolet irradiation

Cited by 23 publications

References 47 publications

New Approach Synthesis of S, N Co‐Doped Graphenes for High‐Performance Supercapacitors

New Approach Synthesis of S, N Co‐Doped Graphenes for High‐Performance Supercapacitors

Defect‐Derived Catalysis Mechanism of Electrochemical Reactions in Two‐Dimensional Carbon Materials

Feasible Tuning of Surface OVs on (001) TiO2 for Superior Photocatalytic Nitrogen Fixation Activity

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Feasible Tuning of Surface OVs on (001) TiO₂ for Superior Photocatalytic Nitrogen Fixation Activity