The synergistic effect of nitrogen and fluorine co-doping in graphene quantum dot catalysts for full water splitting and supercapacitor

Sim, Yelyn; Kim, Seung Jae; Janani, Gnanaprakasam; Chae, Yujin; Surendran, Subramani; Kim, Hyunkyu; Yoo, Seungryul; Seok, Dong Chan; Jung, Young‐Dae; Jeon, Cheolho; Moon, Joonhee

doi:10.1016/j.apsusc.2019.145157

Cited by 78 publications

(35 citation statements)

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“…It has been demonstrated that CDs can be directly used as active materials for OER. For example, N and F co‐doped GQDs (N, F‐GQDs) were synthesized by Sim et al 163 using a two‐step functionalization method. Due to the doping effect, N, F‐GQDs were composed of the covalent C–F bond and semi‐ionic bond, which enhanced the electrocatalytic activity.…”

Section: Applications Of Cds In Electrocatalysismentioning

confidence: 99%

A review of carbon dots and their composite materials for electrochemical energy technologies

et al. 2021

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Carbon dots (CDs) and their composites as energy storage materials and electrocatalysts have emerged as new types of quasi‐zero‐dimensional carbon materials. CDs can provide a large specific surface area, numerous electron–electron hole pairs, adjustable heteroatom doping, rich surface functional groups, and so on. However, the roles and functional mechanisms of CDs and their composite materials in the enhancement of electrochemical performance remain unclear and need to be understood in depth. Based on the most recent literature, this paper comprehensively reviews the synthesis methods and applications of various categories of CDs and their composites as electrode materials of supercapacitors, lithium‐ion batteries, sodium‐ion batteries, and potassium‐ion batteries, and as electrocatalysts for hydrogen evolution, oxygen evolution, and oxygen reduction reactions in metal–air batteries, fuel cells, and water electrolysis. To facilitate further research and development, several important aspects related to CDs and their composite materials are summarized with analysis of the technical challenges in practical applications and discussion of the possible development perspectives.

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Section: Applications Of Cds In Electrocatalysismentioning

confidence: 99%

A review of carbon dots and their composite materials for electrochemical energy technologies

et al. 2021

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“…However, the electrical double-layer capacitance of CNT fiber alone is rather limited (~10–20 F/g) [ 16 ] and is insufficient for commercial devices. In order to circumvent this bottleneck, doping [ 17 ] or integration of pseudocapacitance materials (such as RuO 2 and MnO 2 ) into CNT fibers is beneficial and leads to a substantial improvement of the electrochemical performance of CNT fiber-based electrodes [ 18 ]. Among the different pseudocapacitance materials, MnO 2 is particularly attractive for large-scale production due to its low cost, abundance, and high theoretical capacitance (1370 F/g).…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotube Fibers Decorated with MnO2 for Wire-Shaped Supercapacitor

Zhang

Jian³

et al. 2021

Molecules

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Fibers made from CNTs (CNT fibers) have the potential to form high-strength, lightweight materials with superior electrical conductivity. CNT fibers have attracted great attention in relation to various applications, in particular as conductive electrodes in energy applications, such as capacitors, lithium-ion batteries, and solar cells. Among these, wire-shaped supercapacitors demonstrate various advantages for use in lightweight and wearable electronics. However, making electrodes with uniform structures and desirable electrochemical performances still remains a challenge. In this study, dry-spun CNT fibers from CNT carpets were homogeneously loaded with MnO2 nanoflakes through the treatment of KMnO4. These functionalized fibers were systematically characterized in terms of their morphology, surface and mechanical properties, and electrochemical performance. The resulting MnO2–CNT fiber electrode showed high specific capacitance (231.3 F/g) in a Na2SO4 electrolyte, 23 times higher than the specific capacitance of the bare CNT fibers. The symmetric wire-shaped supercapacitor composed of CNT–MnO2 fiber electrodes and a PVA/H3PO4 electrolyte possesses an energy density of 86 nWh/cm and good cycling performance. Combined with its light weight and high flexibility, this CNT-based wire-shaped supercapacitor shows promise for applications in flexible and wearable energy storage devices.

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“…The electrochemical performance of Cu2O and Co3O4 particles and their different composites is well documented in literature [47][48][49][50][51][52][53]. Similarly, the electrical conductivity of nitrogen doped carbon is also reported [54][55][56][57][58].…”

Section: Electrochemical Water Splitting By Cu2o-co3o4/cn Compositementioning

confidence: 74%

Facile Synthesis of Copper Oxide-Cobalt Oxide/Nitrogen-Doped Carbon (Cu2O-Co3O4/CN) Composite for Efficient Water Splitting

et al. 2021

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Herein, we report a copper oxide-cobalt oxide/nitrogen-doped carbon hybrid (Cu2O-Co3O4/CN) composite for electrochemical water splitting. Cu2O-Co3O4/CN is synthesized by an easy two-step reaction of melamine with Cu2O-Co3O4/CN composite. The designed composite is aimed to solve energy challenges by producing hydrogen and oxygen via electrochemical catalysis. The proposed composite offers some unique advantages in water splitting. Carbon imparts superior conductivity, while the water oxidation abilities of Cu2O and Co3O4 are considered to constitute a catalyst. The synthesized composite (Cu2O-Co3O4/CN) is characterized by SEM, EDS, FTIR, TEM, and AFM in terms of the size, morphology, shape, and elemental composition of the catalyst. The designed catalyst’s electrochemical performance is evaluated via linear sweep voltammetry (LSV) and cyclic voltammetry (CV). The Cu2O-Co3O4/CN composite shows significant electrocatalytic activity, which is further improved by introducing nitrogen doped carbon (current density 10 mA cm−2, onset potential 91 mV, and overpotential 396 mV).

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The synergistic effect of nitrogen and fluorine co-doping in graphene quantum dot catalysts for full water splitting and supercapacitor

Cited by 78 publications

References 50 publications

A review of carbon dots and their composite materials for electrochemical energy technologies

A review of carbon dots and their composite materials for electrochemical energy technologies

Carbon Nanotube Fibers Decorated with MnO2 for Wire-Shaped Supercapacitor

Facile Synthesis of Copper Oxide-Cobalt Oxide/Nitrogen-Doped Carbon (Cu2O-Co3O4/CN) Composite for Efficient Water Splitting

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