Structure-controlled graphene electrocatalysts for high-performance H<sub>2</sub>O<sub>2</sub> production

Lee, Kyungbin; Lim, Jeonghoon; Lee, Michael J.; Ryu, Kun; Lee, Hoyoung; Kim, Jin Young; Ju, Hyunchul; Cho, Hyun‐Seok; Kim, Byung‐Hyun; Hatzell, Marta C.; Kang, Jeong‐han; Lee, Seung Woo

doi:10.1039/d2ee00548d

Cited by 94 publications

(57 citation statements)

References 53 publications

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“…A slight shift of (002) peak position can be dependent on different amounts of functional groups within each NCG sample. [ 32,47 ]…”

Section: Resultsmentioning

confidence: 99%

“…These low O/C ratios of NCGs indicate that the aerosol process at the high temperature of 1000 °C effectively reduced NCGs. [ 47 ] The S2p peak was additionally observed in the survey scan of NCG‐CYS sample due to the sulfhydryl group of l‐cysteine, and its atomic sulfur to carbon ratio was determined to be 0.01. All samples showed a CN peak with an atomic N to carbon (N/C) ratio of 0.03, indicating similar amounts of N‐doping to graphene.…”

Section: Resultsmentioning

confidence: 99%

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Controlled Nitrogen Doping in Crumpled Graphene for Improved Alkali Metal‐Ion Storage under Low‐Temperature Conditions

Lee

Lim

et al. 2022

Adv Funct Materials

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The significant performance decay in conventional graphite anodes under low-temperature conditions is attributed to the slow diffusion of alkali metal ions, requiring new strategies to enhance the charge storage kinetics at low temperatures. Here, nitrogen (N)-doped defective crumpled graphene (NCG) is employed as a promising anode to enable stable low-temperature operation of alkali metal-ion storage by exploiting the surface-controlled charge storage mechanisms. At a low temperature of −40 °C, the NCG anodes maintain high capacities of ≈172 mAh g −1 for lithium (Li)-ion, ≈107 mAh g −1 for sodium (Na)ion, and ≈118 mAh g −1 for potassium (K)-ion at 0.01 A g −1 with outstanding rate-capability and cycling stability. A combination of density functional theory (DFT) and electrochemical analysis further reveals the role of the N-functional groups and defect sites in improving the utilization of the surface-controlled charge storage mechanisms. In addition, the full cell with the NCG anode and a LiFePO 4 cathode shows a high capacity of ≈73 mAh g −1 at 0.5 °C even at −40 °C. The results highlight the importance of utilizing the surface-controlled charge storage mechanisms with controlled defect structures and functional groups on the carbon surface to improve the charge storage performance of alkali metal-ion under low-temperature conditions.

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“…A slight shift of (002) peak position can be dependent on different amounts of functional groups within each NCG sample. [ 32,47 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Controlled Nitrogen Doping in Crumpled Graphene for Improved Alkali Metal‐Ion Storage under Low‐Temperature Conditions

Lee

Lim

et al. 2022

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

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“…As demonstrated in previous experimental and theoretical research, the catalytic performance of oxygen species functionalized carbon materials (O−C) is not only positively correlated with active oxygen species but also the crystallinity (i. e., the degree of graphitization) of carbon substrate [14,18,19] . For instance, the highly‐graphitized carbon nanotubes with the active oxygen species (O−C=O and C−O−C) showing ∼90 % H 2 O 2 selectivity [15,20,21] . Nevertheless, a massive consumption of strong oxidizer and washing water during the oxidation of (e. g., graphite, carbon nanotubes) brings severe environmental problems.…”

Section: Introductionmentioning

confidence: 86%

CO₂ Laser‐Induced Graphene with an Appropriate Oxygen Species as an Efficient Electrocatalyst for Hydrogen Peroxide Synthesis

Fan

Wang

et al. 2022

Chemistry A European J

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Oxygen species functionalized graphene (O−G) is an effective electrocatalyst for electrochemically synthesizing hydrogen peroxide (H2O2) by a 2 e− oxygen reduction reaction (ORR). The type of oxygen species and degree of carbon crystallinity in O−G are two key factors for the high catalytic performance of the 2 e− ORR. However, the general preparing method of O−G by the precursor of graphite has the disadvantages of consuming massive strong oxidant and washing water. Herein, the biomass‐based graphene with tunable oxygen species is rapidly fabricated by a CO2 laser. In a flow cell setup, the laser‐induced graphene (LIG) with abundant active oxygen species and graphene structure shows high catalytic performance including high Faraday efficiency (over 78 %) and high mass activity (814 mmolgcatalyst−1 h−1), superior to most of the reported carbon‐based electrocatalysts. Density function theory demonstrates the meta‐C atoms at nearby C−O, O−C=O species are the key catalytic sites. Therefore, we develop one facile method to rapidly convert biomass to graphene electrocatalyst used for H2O2 synthesis.

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“…201,237 Researches have demonstrated that they can achieve the simultaneous dehalogenation and oxidation of halide. 237 Because oxygen can be cathodically reduced into H 2 O 2 on carbonaceous catalysts, [238][239][240] the integration of electro-Fenton and membrane separation has drawn increasing attention to remove various organic pollutants (Fig. 6a), such as dye molecules, 241,242 persistent oxalate, 170,171 and antibiotics.…”

Section: Organic Pollutant Removalmentioning

confidence: 99%

Carbon nanomaterial-based membranes for water and wastewater treatment under electrochemical assistance

Fan

Wei

Quan

2023

Environ. Sci.: Nano

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Structure-controlled graphene electrocatalysts for high-performance H₂O₂ production

Abstract: Metal-free carbon materials have emerged as cost-effective and high-performance catalysts for the production of hydrogen peroxide (H2O2) through the two-electron oxygen reduction reaction (ORR). Here, we show that 3D crumpled...

Cited by 94 publications

References 53 publications

Controlled Nitrogen Doping in Crumpled Graphene for Improved Alkali Metal‐Ion Storage under Low‐Temperature Conditions

Controlled Nitrogen Doping in Crumpled Graphene for Improved Alkali Metal‐Ion Storage under Low‐Temperature Conditions

CO₂ Laser‐Induced Graphene with an Appropriate Oxygen Species as an Efficient Electrocatalyst for Hydrogen Peroxide Synthesis

Carbon nanomaterial-based membranes for water and wastewater treatment under electrochemical assistance

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Structure-controlled graphene electrocatalysts for high-performance H2O2 production

Abstract: Metal-free carbon materials have emerged as cost-effective and high-performance catalysts for the production of hydrogen peroxide (H2O2) through the two-electron oxygen reduction reaction (ORR). Here, we show that 3D crumpled...

Cited by 94 publications

References 53 publications

Controlled Nitrogen Doping in Crumpled Graphene for Improved Alkali Metal‐Ion Storage under Low‐Temperature Conditions

Controlled Nitrogen Doping in Crumpled Graphene for Improved Alkali Metal‐Ion Storage under Low‐Temperature Conditions

CO2 Laser‐Induced Graphene with an Appropriate Oxygen Species as an Efficient Electrocatalyst for Hydrogen Peroxide Synthesis

Carbon nanomaterial-based membranes for water and wastewater treatment under electrochemical assistance

Contact Info

Product

Resources

About

Structure-controlled graphene electrocatalysts for high-performance H₂O₂ production

CO₂ Laser‐Induced Graphene with an Appropriate Oxygen Species as an Efficient Electrocatalyst for Hydrogen Peroxide Synthesis