In situ self-assembly of mild chemical reduction graphene for three-dimensional architectures

Chen, Wufeng; Yan, Lifeng

doi:10.1039/c1nr10355e

Cited by 680 publications

(533 citation statements)

References 40 publications

Supporting

Mentioning

508

Contrasting

Unclassified

Order By: Relevance

“…A D‐band (1343 cm −1 ) and a G‐band (1593 cm −1 ) appear on the Raman spectra of GO and S‐RGOH. The D‐band implies the presence of the structural defects or attachments of functional groups on the carbon basal plane, which agrees well with previous study 19, 33. The G‐band is associated with the first‐order scattering of the E2g mode 19.…”

Section: Resultssupporting

confidence: 91%

“…The broad peak at 23.7° on the XRD patterns of S‐RGOH implies that RGO sheets are ordered poorly along their stacking direction and the formation of porous S‐RGOH nanostructures, which is consistent with the SEM characterization in Figure 1b 34. Besides, a small peak appears at 43.2°, which is a fingerprint peak of graphite, demonstrating the reformation of graphitic microcrystals on the S‐RGOH plane 33. The formation of S‐RGOH is further consolidated by Raman spectra analysis (Figure 2b).…”

Section: Resultssupporting

confidence: 82%

“…NaHSO 3 was exploited to reduce GO and modify RGOH with sulfonated groups simultaneously in a facile, one‐step hydrothermal synthesis process at relatively low temperature (<100 °C) (Figure 1a) 33. SEM images exhibit 3D porous structures of the synthesized 3D S‐RGOH (Figure 1b).…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

et al. 2016

View full text Add to dashboard Cite

Reduced graphene oxide (RGO) has proved to be a promising candidate in high‐performance gas sensing in ambient conditions. However, trace detection of different kinds of gases with simultaneously high sensitivity and selectivity is challenging. Here, a chemiresistor‐type sensor based on 3D sulfonated RGO hydrogel (S‐RGOH) is reported, which can detect a variety of important gases with high sensitivity, boosted selectivity, fast response, and good reversibility. The NaHSO3 functionalized RGOH displays remarkable 118.6 and 58.9 times higher responses to NO2 and NH3, respectively, compared with its unmodified RGOH counterpart. In addition, the S‐RGOH sensor is highly responsive to volatile organic compounds. More importantly, the characteristic patterns on the linearly fitted response–temperature curves are employed to distinguish various gases for the first time. The temperature of the sensor is elevated rapidly by an imbedded microheater with little power consumption. The 3D S‐RGOH is characterized and the sensing mechanisms are proposed. This work gains new insights into boosting the sensitivity of detecting various gases by combining chemical modification and 3D structural engineering of RGO, and improving the selectivity of gas sensing by employing temperature dependent response characteristics of RGO for different gases.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 82%

See 1 more Smart Citation

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Recently, assembling graphene sheets into 3D graphene sponge GS was realized by hydrothermal treatment combined with freeze drying technology192021. This process to fabricate GS is facile, lowcost, and scalable, and it opens an innovative field of fabricating highly conductive graphene composites.…”

mentioning

confidence: 99%

Highly Electrically Conductive Nanocomposites Based on PolymerInfused Graphene Sponges

Samad

Polychronopoulou

et al. 2014

Sci Rep

View full text Add to dashboard Cite

Conductive polymer composites require a threedimensional 3D network to impart electrical conductivity. A general method that is applicable to most polymers for achieving a desirable graphene 3D network is still a challenge. We have developed a facile technique to fabricate highly electrical conductive composite using vacuumassisted infusion of epoxy into graphene sponge GS scaffold. Macroscopic GSs were synthesized from graphene oxide solution by a hydrothermal method combined with freeze drying. The GSepoxy composites prepared display consistent isotropic electrical conductivity around 1Sm, and it is found to be close to that of the pristine GS. Compared with neat epoxy, GSepoxy has a 12ordersofmagnitude increase in electrical conductivity, attributed to the compactly interconnected graphene network constructed in the polymer matrix. This method can be extended to other materials to fabricate highly conductive composites for practical applications such as electronic devices, sensors, actuators, and electromagnetic shielding.

show abstract

“…Two essential processes are responsible for the formation of high-density graphene/ sulfur (HDGS). First, the partial reduction of the GO by H 2 S triggers the spatial assembly of reduced graphene oxide (rGO) due to the amphiphilic nature of the rGO sheets [27][28][29]. Second, the evaporation-induced drying process facilitates the driving force for the shrinkage of graphene/ sulfur hydrogel.…”

Section: Perspectivementioning

confidence: 99%

Packing sulfur into carbon framework for high volumetric performance lithium-sulfur batteries

Zhang

Yang

2015

Sci. China Mater.

View full text Add to dashboard Cite

Low volumetric performance is a common bottleneck of carbon-based electrode materials for practical applications, owing to the low density of porous carbons caused by the intrinsic void space [1]. Specifically, lithium-sulfur (Li-S) batteries as a hot topic of next-generation energy storage devices face the same dilemma that we have to balance their intrinsically electrochemical performance and volumetric performance [2][3][4]. The use of conductive porous carbon materials in the cathode of Li-S batteries, such as mesoporous carbon, carbon nanotube and graphene-derived carbons, can effectively accelerate the reaction kinetics, improve the electrochemical performance of sulfur cathode and promote the practical application of insulting sulfur [3,5]. However, addition of these materials results in massive void space in the electrode, which cannot meet the requirement of compact structure in real applications [6]. Such electrodes usually deliver relatively low volumetric performance even though their gravimetric performance can reach a high value.The significance of volumetric performance for electrochemical energy storage (EES) devices has been addressed by our group previously, especially for carbon-based electrodes in supercapacitors, Li-S batteries and so on [1]. It is noted that a very effective approach for improving the volumetric performance of carbon-based electrodes and EES devices is densifying the electrode materials. The density change of carbon-based electrode materials thus will alter the microstructure. In Li-S batteries, the cathode consists of porous carbon and sulfur. Generally, the density of porous carbon is in a very low level (0.3-0.6 g cm −3 ) [7,8], while the density of bulk sulfur is above 2.0 g cm −3 [9]. Thus, the integration of carbon and sulfur is actually the combination of a low-density component and a high-density one. The precondition is that the density of sulfur is not changeable while the density of porous carbon materials can be tuned by controlling their microstructure, such as the pore volume, surface area, etc. [8,[10][11][12]. It is of great interest that a density ceiling of porous carbon materials is of about 2.2 g cm −3 , which is the density of graphite with the most compact structure. Thus, sulfur is always the heavier phase in carbon/sulfur cathode, while carbon is always the lighter one.Based on the understanding of the role of carbon and sulfur in the hybrid electrode, the remedy for improving the density of carbon/sulfur cathode can be classified into two approaches as shown in Fig. 1: improving the sulfur fraction and densifying the carbon matrix. Zhang et al. [13] pioneered the research on the volumetric performance of carbon/sulfur cathode. They fabricated a series of carbon nanotube (CNT)/sulfur hybrids with different sulfur contents to tailor the evolution of the density of the hybrids and their corresponding volumetric performance. A high sulfur fraction up to 90 wt.% was realized with a density of 1.98 g cm −3 for the hybrid material, and it shows an ultrahig...

show abstract

In situ self-assembly of mild chemical reduction graphene for three-dimensional architectures

Cited by 680 publications

References 40 publications

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

Highly Electrically Conductive Nanocomposites Based on PolymerInfused Graphene Sponges

Packing sulfur into carbon framework for high volumetric performance lithium-sulfur batteries

Contact Info

Product

Resources

About