“Protrusions” or “holes” in graphene: which is the better choice for sodium ion storage?

Yang, Yijun; Tang, Dai‐Ming; Zhang, Chao; Zhang, Yihui; Liang, Qifeng; Chen, Shimou; Weng, Qunhong; Zhou, Min; Xue, Yanming; Liu, Jiangwei; Wu, Jinghua; Cui, Qiuhong; Lian, Chang; Hou, Guolin; Yuan, Fangli; Bando, Yoshio; Golberg, Dmitri; Wang, Xi

doi:10.1039/c7ee00329c

Cited by 181 publications

(161 citation statements)

References 55 publications

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“…Previous works have demonstrated positively charged species in heteroatom doped carbons are active centers, [26,27] in this case,S ea toms.A dditionally,t he incorporation of larger atomic radius of Se atom could enlarge graphitic interlayer spacing and lead to structural strains and defects at the graphitic edges, [28,29] which is in favor of promoting the mass transportation efficiency in the graphitic layers and exposing numerous active sites for the HzOR. Previous works have demonstrated positively charged species in heteroatom doped carbons are active centers, [26,27] in this case,S ea toms.A dditionally,t he incorporation of larger atomic radius of Se atom could enlarge graphitic interlayer spacing and lead to structural strains and defects at the graphitic edges, [28,29] which is in favor of promoting the mass transportation efficiency in the graphitic layers and exposing numerous active sites for the HzOR.…”

Section: Resultsmentioning

confidence: 99%

Atomically Dispersed Semimetallic Selenium on Porous Carbon Membrane as an Electrode for Hydrazine Fuel Cells

Wang

et al. 2019

Angew Chem Int Ed

112

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Electrochemically functional porous membranes of low cost are appealing in various electrochemical devices used in modern environmental and energy technologies.H erein we describe as calable strategy to construct electrochemically active,h ierarchically porous carbon membranes containing atomically dispersed semi-metallic Se,d enoted SeNCM. The isolated Se atoms were stabilized by carbon atoms in the form of ah exatomic ring structure,i nw hich the Se atoms were located at the edges of graphitic domains in SeNCM. This configuration is different from that of previously reported transition/noble metal single atom catalysts.T he positively charged Se,e nlarged graphitic layers,r obust electrochemical nature of SeNCM endow them with excellent catalytic activity that is superior to state-of-the-art commercial Pt/C catalyst. It also has long-term operational stability for hydrazine oxidation reaction in practical hydrazine fuel cell.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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Section: Resultsmentioning

confidence: 99%

Atomically Dispersed Semimetallic Selenium on Porous Carbon Membrane as an Electrode for Hydrazine Fuel Cells

Wang

et al. 2019

Angew Chem Int Ed

112

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“…[61,62] Density functional theory calculations for sodium adsorption revealed that each dopant (pyridinic/pyrrolic nitrogen, boron, phosphorus, fluorine) can lower the diffusion energy barrier by creating an electronic deficient system, and that codoping with two different heteroatoms shows a synergistic effect for improved capacity. [86] Luo et al first demonstrated the electrochemical storage of potassium in RGO for a capacity of 220 mAh g −1 at 5 mA g −1 , with a sloping voltage profile. For example, in Figure 6b, graphene with protrusions achieved a capacity of 374 mAh g −1 after 120 cycles at 20 mA g −1 , as compared to 211 mAh g −1 for graphene with holes.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

“…[105] MWCNTs exhibit poorer cycling stability, along with less than half the sodium insertion capacity of SWCNTs, due to the less ordered internal environment, resulting in 30 mAh g −1 after 100 cycles. [86] Copyright 2017, The Royal Society of Chemistry. Energy Mater.…”

Section: Carbon Nanotubesmentioning

confidence: 99%

“…[183] Doping of carbon with heteroatoms (e.g., nitrogen, boron, phosphorus, sulfur) can affect the electronic properties and energetics of alkali metal intercalation and binding. [86,178] Overall, carbon anode material properties must be carefully considered to obtain a practical cell with reasonable electrochemical performance. However, the presence of heteroatoms, such as hydrogen, often increases the voltage hysteresis between charge and discharge curves, lowering the full cell energy density and energy efficiency.…”

Section: Relationship Between Materials Properties and Electrochemicalmentioning

confidence: 99%

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Carbon Anodes for Nonaqueous Alkali Metal‐Ion Batteries and Their Thermal Safety Aspects

Adams

Varma

2019

Advanced Energy Materials

140

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electrolyte, but were limited by significant safety concerns, such as thermal runaway, arising from the lithium metal anode and its tendency for dendrite formation. These dendrites develop and grow due to uneven lithium deposition caused by irregularities in the solid electrolyte interphase (SEI) passivation layer, which forms via electrolyte decomposition on the highly reactive lithium anode surface. Eventually, repeated cycling can result in an internal short circuit via puncturing of the separator by dendrites for cell failure and possible thermal runaway. Extensive research was conducted to mitigate these concerns, primarily by electrolyte manipulation to improve SEI uniformity or implementation of a polymer based solid-state electrolyte. However, this issue has still not been fully overcome even to this day, resulting in the alternative strategy of replacing the lithium anode with an intercalation-based storage material.The development of these "rocking chair" batteries began in the 1980s, where charging transfers lithium from cathode to anode and discharging reverses this process, with the first practical demonstrations by Scrosati. [2] Substantial progress came with the discoveries of the standard electrode materials: LiCoO 2 cathode by Goodenough and co-workers in 1981, [3] and graphite anode by Yazami and Touzain in 1983. [4] The first cell comprising a carbon anode and LiCoO 2 cathode was tested by Yoshino in 1983, which exhibited superior safety features as compared to lithium metal anode. [5] Optimization of the electrolyte came from replacing propylene carbonate (PC), which underwent a decomposition reaction with graphite due to cointercalation and exfoliation, to ethylene carbonate (EC)/ diethyl carbonate (DEC) mixtures. A schematic of this mature LIB is shown in Figure 1a. Sony commercialized the lithiumion battery (LIB) in 1991, where the new electrochemistry demonstrated advantages of higher energy density, longer life time, and no memory effect, as compared to the conventional nickel-cadmium and nickel-metal hydride secondary cells. Further progress and improvement in electrolyte, electrode microstructure, and cell manufacturing has led to a doubling of energy density for LIBs since their inception, almost 30 years later, despite their analogous operation mechanism. [6] Additionally, from their initial application for handheld electronics, LIBs are now seeing rapid utilization in vehicle electrification, with the global LIB capacity projected to double to 278 GWh per year Since their commercialization by Sony in 1991, graphite anodes in combination with various cathodes have enabled the widespread success of lithium-ion batteries (LIBs), providing over 10 billion rechargeable batteries to the global population. Next-generation nonaqueous alkali metal-ion batteries, namely sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs), are projected to utilize intercalation-based carbon anodes as well, due to their favorable electrochemical properties. While traditionally graphite anodes have d...

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“…As an example, graphene, a single layer of carbon atoms arranged in a hexagonal lattice, is an appealing material for photonics and electronics [23][24][25]. Conventional graphene materials can absorb photons from visible to infrared range [26,27] and exhibit a huge electrical mobility up to 200,000 cm 2 V −1 s −1 for a free sheet for both electrons and holes [28], which promote ultrafast conversion of photons or plasmons [29] to electrical currents or voltages for photo response.…”

Section: Two-dimensional Photodetectors Made Of Single-component Semimentioning

confidence: 99%

Material and Device Architecture Engineering Toward High Performance Two-Dimensional (2D) Photodetectors

Cui

Yang

et al. 2017

Crystals

Self Cite

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Photodetectors based on two-dimensional (2D) nanostructures have led to a high optical response, and a long photocarrier lifetime because of spatial confinement effects. Since the discovery of graphene, many different 2D semiconductors have been developed and utilized in the ultrafast and ultrasensitive detection of light in the ultraviolet, visible, infrared and terahertz frequency ranges. This review presents a comprehensive summary of recent breakthroughs in constructing high-performance photodetectors based on 2D materials. First, we give a general overview of 2D photodetectors based on various single-component materials and their operating wavelength (ultraviolet to terahertz regime). Then, we summarize the design and controllable synthesis of heterostructure material systems to promote device photoresponse. Subsequently, special emphasis is put on the accepted methods in rational engineering of device architectures toward the photoresponse improvements. Finally, we conclude with our personal viewpoints on the challenges and promising future directions in this research field.

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“Protrusions” or “holes” in graphene: which is the better choice for sodium ion storage?

Abstract: The introduction of protrusions through P-doping into graphene is an effective strategy to enhance electrochemical performances in SIBs.

Cited by 181 publications

References 55 publications

Atomically Dispersed Semimetallic Selenium on Porous Carbon Membrane as an Electrode for Hydrazine Fuel Cells

Atomically Dispersed Semimetallic Selenium on Porous Carbon Membrane as an Electrode for Hydrazine Fuel Cells

Carbon Anodes for Nonaqueous Alkali Metal‐Ion Batteries and Their Thermal Safety Aspects

Material and Device Architecture Engineering Toward High Performance Two-Dimensional (2D) Photodetectors

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