Vertically Oriented Graphene Nanosheets for Electrochemical Energy Storage

He, Pingge; Chen, Shaowei

doi:10.1002/celc.202001364

Cited by 9 publications

(4 citation statements)

References 106 publications

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“…When one graphene sheet bumps against the other one, the collision creates a force perpendicular to the substrate, an upward curling force that causes the headmost carbon layer to bump up and grow vertically to the substrate. [ 29 ] The plane in which the upward curling force is located is called the strongly bonded plane, and the plane perpendicular to it is called the weakly bonded plane. Specifically, the growth rate of strongly bonded planes (vertical direction to the substrate) is faster than weakly bonded stacking direction (parallel direction to the substrate), thus obtaining a tapered structure that the graphene layers gradually decrease from substrate to edge at a growth time of 4 h (Figure 2i).…”

Section: Resultsmentioning

confidence: 99%

Metal‐free Fabrication of Nitrogen‐doped Vertical Graphene on Graphite Felt Electrodes with Enhanced Reaction Kinetics and Mass Transport for High‐performance Redox Flow Batteries

Guo,

Pan,

Sun

et al. 2023

Advanced Energy Materials

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Graphite felt is commonly used in redox flow batteries, but the low specific surface area and poor catalytic activity cause unsatisfactory mass transfer and reaction kinetics. Here, nitrogen‐doped vertical graphene is in‐situ grown on graphite felt via a metal‐free chemical vapor deposition method, which exhibits a high specific surface area and remarkable catalytic activity due to abundant exposed high‐density sharp graphene edges and nitrogen doping. Multiphysical simulations reveal that the vertical‐standing nanostructure promotes the accessibility of vanadium ions to electrode/electrolyte interfaces, effectively decreasing the mass transport resistance of active species. Density functional theory calculation evidence shows that nitrogen doping aids in the improvement of catalytic activity via boosting vanadium ions’ adsorption and redox. Consequently, the nitrogen‐doped vertical graphene/graphite felt electrode shows an energy efficiency of 87.1% at 200 mA cm−2, significantly higher than that of pristine (65.9%) and air‐oxidize (73.1%) electrodes, an energy efficiency over 80.2% at 300 mA cm−2 during 1500 cycles, and a high‐peak power density of 1308.56 mW cm−2, which are superior to previously reported carbon nanomaterial decorated electrodes for flow batteries. Significantly, the synthesis process only involves gas‐phase reactions without metal catalysts to avoid hydrogen evolution reactions. This work provides an exciting pathway for developing high‐performance electrodes for flow batteries.

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Section: Resultsmentioning

confidence: 99%

Metal‐free Fabrication of Nitrogen‐doped Vertical Graphene on Graphite Felt Electrodes with Enhanced Reaction Kinetics and Mass Transport for High‐performance Redox Flow Batteries

Guo,

Pan,

Sun

et al. 2023

Advanced Energy Materials

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“…Design and construction of micro/nanostructures is another promising strategy to improve the electrochemical performance of cathode materials, due to the enlarged specific surface area, enhanced accessibility to electrolyte, as well as increased active sites for ion absorption. [105,106] In fact, cathode materials with micro/nanospheres, nanosheets, nanofibers, and nanotubes have been widely used for ZIB applications, [107][108][109] demonstrating the significance of micro/nanostructure design in the optimization of electrochemical performance for cathode materials. In this section, two types of micro/nanostructure designs (hollow and core-shell structures) of cathodes will be examined to reveal the unique ion/charge transport mechanisms in such structures.…”

Section: Micro/nanostructure Designmentioning

confidence: 99%

Cathode strategies to improve the performance of zinc‐ion batteries

Chen

2021

Electrochemical Science Adv

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Zinc‐ion battery (ZIB) has been attracting extensive attention due to its high theoretical capacity, high safety, and low cost. However, the exploration of suitable cathode materials to host Zn ions remains a challenge, owing to the strong electrostatic interactions and large steric hindrance effects between Zn ion and host materials. Great efforts have been devoted to the optimization of the structure and electrochemical property of the cathode materials. In this review article, we summarize recent cathode‐based strategies to address the issues of performance degradation and structural collapse of electrode materials within the context of microstructure design and ion/charge transport mechanism, and include a perspective to highlight the challenges and promises in the exploitation of cathode materials for further enhancement of the performance of ZIBs.

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“…Since the discovery of graphene in 2004, 2D materials have experienced rapid development. For example, 2D carbon materials demonstrate excellent properties, such as high specific surface area and high electrical conductivity [ 23 ]. Since the working mechanism of EDLCs is an electrostatic effect, the anions and cations on the electrode material surface move to the positive and negative electrodes during the charging and discharging process, forming electric double-layers at the interface.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Studies on the Quantum Capacitance of Two-Dimensional Electrode Materials for Supercapacitors

et al. 2023

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In recent years, supercapacitors have been widely used in the fields of energy, transportation, and industry. Among them, electrical double-layer capacitors (EDLCs) have attracted attention because of their dramatically high power density. With the rapid development of computational methods, theoretical studies on the physical and chemical properties of electrode materials have provided important support for the preparation of EDLCs with higher performance. Besides the widely studied double-layer capacitance (CD), quantum capacitance (CQ), which has long been ignored, is another important factor to improve the total capacitance (CT) of an electrode. In this paper, we survey the recent theoretical progress on the CQ of two-dimensional (2D) electrode materials in EDLCs and classify the electrode materials mainly into graphene-like 2D main group elements and compounds, transition metal carbides/nitrides (MXenes), and transition metal dichalcogenides (TMDs). In addition, we summarize the influence of different modification routes (including doping, metal-adsorption, vacancy, and surface functionalization) on the CQ characteristics in the voltage range of ±0.6 V. Finally, we discuss the current difficulties in the theoretical study of supercapacitor electrode materials and provide our outlook on the future development of EDLCs in the field of energy storage.

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Vertically Oriented Graphene Nanosheets for Electrochemical Energy Storage

Cited by 9 publications

References 106 publications

Metal‐free Fabrication of Nitrogen‐doped Vertical Graphene on Graphite Felt Electrodes with Enhanced Reaction Kinetics and Mass Transport for High‐performance Redox Flow Batteries

Metal‐free Fabrication of Nitrogen‐doped Vertical Graphene on Graphite Felt Electrodes with Enhanced Reaction Kinetics and Mass Transport for High‐performance Redox Flow Batteries

Cathode strategies to improve the performance of zinc‐ion batteries

Theoretical Studies on the Quantum Capacitance of Two-Dimensional Electrode Materials for Supercapacitors

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