Heteroatom doped graphene engineering for energy storage and conversion

Kumar, Rajesh; Sahoo, Sumanta; Joanni, Ednan; Singh, Rajesh Kumar; Maegawa, Keiichiro; Tan, Wei; Kawamura, Go; Kar, Kamal K.; Matsuda, Atsunori

doi:10.1016/j.mattod.2020.04.010

Cited by 502 publications

(157 citation statements)

References 426 publications

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“…Over the past decade, graphene-based materials (GBM) have been widely explored for a huge number of applications, including energy, aerospace, biomedicine, and health [8][9][10][11][12][13][14][15]. Recently, GBM emerged as potential PTT-based cancer therapy platforms owing to their high NIR absorption [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Near-Infrared Radiation-Based Mild Photohyperthermia Therapy of Non-Melanoma Skin Cancer with PEGylated Reduced Nanographene Oxide

et al. 2020

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Using a one-step thermal reduction and non-covalent chemical functionalization process, PEGylated reduced nanographene oxide (rGOn-PEG) was produced from nanographene oxide (GOn) and characterized in terms of particle size, dispersion stability, chemistry, and photothermal properties, in view of its use for photothermal therapy (PTT) of non-melanoma skin cancer. GOn infrared spectrum presented more intense bands assigned to oxygen containing functional groups than observed for rGOn-PEG. GOn C/O ratio decreased more than 50% comparing with rGOn-PEG and nitrogen was present in the latter (N at % = 20.6) due to introduction of PEG-NH2. Thermogravimetric analysis allowed estimating the amount of PEG in rGOn-PEG to be of about 56.1%. Simultaneous reduction and PEGylation increased the lateral dimensions from 287 ± 139 nm to 521 ± 397 nm, as observed by transmission electron microscopy and dynamic light scattering. rGOn-PEG exhibited ≈13-fold higher absorbance in the near-infrared radiation (NIR) region, as compared to unmodified GOn. Low power (150 mW cm−2) NIR irradiation using LEDs resulted in rGOn-PEG heating up to 47 °C, which is within the mild PTT temperature range. PEGylation strongly enhanced the dispersibility of rGOn in physiological media (phosphate buffered saline, fetal bovine serum, and cell culture medium) and also improved the biocompatibility of rGOn-PEG, in comparison to GOn (25–250 μg mL−1). After a single NIR LED irradiation treatment of 30 min, a decrease of ≈38% in A-431 cells viability was observed for rGOn-PEG (250 μg mL−1). Together, our results demonstrate the potential of irradiating rGOn-PEG using lower energy, cheaper, smaller, and safer LEDs, as alternative to high power lasers, for NIR mild hyperthermia therapy of cancer, namely non-melanoma skin cancer.

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Section: Introductionmentioning

confidence: 99%

Near-Infrared Radiation-Based Mild Photohyperthermia Therapy of Non-Melanoma Skin Cancer with PEGylated Reduced Nanographene Oxide

et al. 2020

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“…Similarly, reduced graphene oxide has few such groups, whereas graphene is a two‐carbon material. [ 77–79 ]…”

Section: Electrode Materialsmentioning

confidence: 99%

Design of Metals Sulfides with Carbon Materials for Supercapacitor Applications: A Review

Iqbal

Ashiq

2021

Energy Tech

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Supercapacitors are very exclusive among energy‐storage devices for the wearable and portable industry. Due to simplicity, abundance occurrence, good electrical conductivity, and rich redox states, metal sulfides have a significant impact in supercapacitor applications in the present decade. Sulfur is the anion, associated with metal cations, and provides substantial tunable electrochemical, electrical, physical, and chemical properties in metal sulfides. In addition, carbonaceous materials enhance the electrochemical characteristics of metal sulfides synergistically for supercapacitors. Fast and scalable synthesis and fabrication of the supercapacitor cell with low‐cost metal sulfides and heterostructures should be developed to achieve the potential applications of these hybrid glorious materials. Herein, the significant and critical discussion of metal sulfides synthesis and their hybrid with carbon electrode structures for supercapacitor applications is disclosed. The realistic synthesis of metal sulfides, basic charge storage phenomena to elaborate the electrode nature, electrochemical properties including a single electrode, and asymmetric and symmetric cells are demonstrated for comparative purposes. The market values and application of supercapacitors are also elaborated. Herein, a better understanding to fresh readers about metal sulfide hybrid electrode structures for supercapacitors is provided.

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“…Graphene is a carbon allotrope that has the potential to be utilized in many application such as hydrogen storage [5], supercapacitors [6], hydrogen sensing [7], energy storage [8][9][10][11], and enhanced electromagnetic interface shielding [12]. Graphene is also a suitable additive to improve the tribological properties of bio-lubricants.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Behavior of Graphene and Ionic Liquid as Bio-Based Lubricant Additive

et al. 2021

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The constant utilization of petroleum-based products has prompted concerns about the environment, hence a replacement for these products must be explored. Biolubricants are a suitable replacement for petroleum-based lubricants as they provide better lubricity. Biolubricant performance can be improved by the addition of graphene. However, there are reports that graphene is unable to form a stable suspension for a long period. This study used a graphene-ionic liquid additive combination to stabilize the dispersion in a biolubricant. Graphene and ionic liquid were dispersed into the biolubricant via a magnetic stirrer. The samples were tested using a high frequency reciprocating rig. The cast iron sample was then further observed using various techniques to determine the lubricating mechanism of the lubricant. Different dispersion stability of graphene was observed for different biolubricants, which can be improved with ionic liquids. All ionic liquid samples maintained an absorbance value of three for one month. The utilization of ionic liquid was also able to decrease the frictional performance by 33%. Further study showed that by using the ionic liquid alone, the frictional could only reduce the friction coefficient by 13% and graphene could only reduce the friction by 7%. A smooth worn surface scar can be seen on the graphene-IL sample compared to the prominent corrosive spot on the IL samples and abrasive scars on graphene samples. This indicates synergistic behavior between the two additives. It was found that the ionic liquid does not only improve the dispersion stability, but also plays a role in forming the tribolayer.

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Heteroatom doped graphene engineering for energy storage and conversion

Cited by 502 publications

References 426 publications

Near-Infrared Radiation-Based Mild Photohyperthermia Therapy of Non-Melanoma Skin Cancer with PEGylated Reduced Nanographene Oxide

Near-Infrared Radiation-Based Mild Photohyperthermia Therapy of Non-Melanoma Skin Cancer with PEGylated Reduced Nanographene Oxide

Design of Metals Sulfides with Carbon Materials for Supercapacitor Applications: A Review

Synergistic Behavior of Graphene and Ionic Liquid as Bio-Based Lubricant Additive

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