scholarly journals Polydopamine Doping and Pyrolysis of Cellulose Nanofiber Paper for Fabrication of Three-Dimensional Nanocarbon with Improved Yield and Capacitive Performances

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3249
Author(s):  
Luting Zhu ◽  
Kojiro Uetani ◽  
Masaya Nogi ◽  
Hirotaka Koga
Keyword(s):  
Electrical Conductivity ◽  
Surface Area ◽  
High Performance ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Cellulose Nanofiber ◽  
Supercapacitor Electrode ◽  
Carbohydrate Polymer ◽  
Volume Retention

Biomass-derived three-dimensional (3D) porous nanocarbons have attracted much attention due to their high surface area, permeability, electrical conductivity, and renewability, which are beneficial for various electronic applications, including energy storage. Cellulose, the most abundant and renewable carbohydrate polymer on earth, is a promising precursor to fabricate 3D porous nanocarbons by pyrolysis. However, the pyrolysis of cellulosic materials inevitably causes drastic carbon loss and volume shrinkage. Thus, polydopamine doping prior to the pyrolysis of cellulose nanofiber paper is proposed to fabricate the 3D porous nanocarbons with improved yield and volume retention. Our results show that a small amount of polydopamine (4.3 wt%) improves carbon yield and volume retention after pyrolysis at 700 °C from 16.8 to 26.4% and 15.0 to 19.6%, respectively. The pyrolyzed polydopamine-doped cellulose nanofiber paper has a larger specific surface area and electrical conductivity than cellulose nanofiber paper that without polydopamine. Owing to these features, it also affords a good specific capacitance up to 200 F g−1 as a supercapacitor electrode, which is higher than the recently reported cellulose-derived nanocarbons. This method provides a pathway for the effective fabrication of high-performance cellulose-derived 3D porous nanocarbons.

Monolithic three-dimensional graphene frameworks derived from inexpensive graphite paper as advanced anodes for microbial fuel cells

2016 ◽  
Vol 4 (17) ◽  
pp. 6342-6349 ◽  
Author(s):  
Meiqiong Chen ◽  
Yinxiang Zeng ◽  
Yitong Zhao ◽  
Minghao Yu ◽  
Faliang Cheng ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cells ◽  
Surface Area ◽  
Microbial Fuel Cells ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Great Promise ◽  
Macroporous Structure

Three dimensional graphene-based frameworks (3DGFs) hold great promise for microbial fuel cells (MFCs) due to their macroporous structure, outstanding electrical conductivity, high surface area and prominent biocompatibility.

Palladium aerogel as a high-performance electrocatalyst for ethanol electro-oxidation in alkaline media

2017 ◽  
Vol 5 (21) ◽  
pp. 10244-10249 ◽  
Author(s):  
Mehdi Zareie Yazdan-Abad ◽  
Meissam Noroozifar ◽  
Ali Reza Modaresi Alam ◽  
Hamideh Saravani
Keyword(s):  
Surface Area ◽  
Noble Metal ◽  
High Performance ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Alkaline Media ◽  
3D Nanostructures ◽  
Electro Oxidation

Noble metal aerogels as three-dimensional (3D) nanostructures with high surface area and large porosity are known to be exceptional materials that can be applied in the area of catalysis applications.

High surface area activated carbon from rice husk as a high performance supercapacitor electrode

2016 ◽  
Vol 192 ◽  
pp. 110-119 ◽  
Author(s):  
Ellie Yi Lih Teo ◽  
Lingeswarran Muniandy ◽  
Eng-Poh Ng ◽  
Farook Adam ◽  
Abdul Rahman Mohamed ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Rice Husk ◽  
High Performance ◽  
High Surface ◽  
High Surface Area ◽  
Supercapacitor Electrode

Carbon nanofibers by pyrolysis of self-assembled perylene diimide derivative gels as supercapacitor electrode materials

2015 ◽  
Vol 3 (30) ◽  
pp. 15513-15522 ◽  
Author(s):  
Xia Liu ◽  
Aled Roberts ◽  
Adham Ahmed ◽  
Zhenxin Wang ◽  
Xu Li ◽  
...  
Keyword(s):  
Surface Area ◽  
Carbon Nanofibers ◽  
High Performance ◽  
Electrode Materials ◽  
High Surface ◽  
High Surface Area ◽  
Perylene Diimide ◽  
Supercapacitor Electrode ◽  
Water Based ◽  
Supercapacitor Electrode Materials

A water-based approach to fabricating CNFs from a perylene diimide derivative via gelation and carbonization is described. Pluronic F-127 as templates can be readily incorporated to form CNFs with high surface area, showing high performance as electrode materials for supercapacitors.

From ZIF nanoparticles to hierarchically porous carbon: toward very high surface area and high-performance supercapacitor electrode materials

2019 ◽  
Vol 6 (1) ◽  
pp. 32-39 ◽  
Author(s):  
Fangfang Wang ◽  
Liangkui Zhu ◽  
Ying Pan ◽  
Zhan Li ◽  
Pingping Yang ◽  
...  
Keyword(s):  
Surface Area ◽  
High Performance ◽  
Electrode Materials ◽  
High Surface ◽  
High Surface Area ◽  
High Specific Capacitance ◽  
Supercapacitor Electrode ◽  
Capacitive Energy Storage ◽  
Energy Storage Material ◽  
Supercapacitor Electrode Materials

A high-performance capacitive energy storage material was derived from a new nanoscale ZIF precursor by using the activating reagent KOH, exhibiting a high surface area of 3253 m2 g−1 and an ultra-high specific capacitance.

scholarly journals Structural differences between Sb- and Nb-doped tin oxides and consequences for electrical conductivity

2016 ◽  
Vol 40 (3) ◽  
pp. 2655-2660 ◽  
Author(s):  
Emma Oakton ◽  
Jérémy Tillier ◽  
Georges Siddiqi ◽  
Zlatko Mickovic ◽  
Olha Sereda ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Tin Oxides ◽  
Structural Differences ◽  
Co Precipitation

High surface area Nb and Sb-doped tin oxides are prepared by co-precipitation. The differences in conductivity are rationalised using HT-XRD, SSNMR and Nb K-edge XANES characterisation.

Hierarchical Nano/Micro-structured Surfaces with High Surface Area/Volume Ratios

2021 ◽  
pp. 1-36
Author(s):  
Ketki Lichade ◽  
Yizhou Jiang ◽  
Yayue Pan
Keyword(s):  
Surface Structure ◽  
Surface Area ◽  
Light Trapping ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Structure Design ◽  
Surface Structures ◽  
Structured Surfaces ◽  
Design And Manufacture

Abstract Recently, many studies have investigated additive manufacturing of hierarchical surfaces with high surface area/volume (SA/V) ratios, and their performance has been characterized for applications in next-generation functional devices. Despite recent advances, it remains challenging to design and manufacture high SA/V ratio structures with desired functionalities. In this study, we established the complex correlations among the SA/V ratio, surface structure geometry, functionality, and manufacturability in the Two-Photon Polymerization (TPP) process. Inspired by numerous natural structures, we proposed a 3-level hierarchical structure design along with the mathematical modeling of the SA/V ratio. Geometric and manufacturing constraints were modeled to create well-defined three-dimensional hierarchically structured surfaces with a high accuracy. A process flowchart was developed to design the proposed surface structures to achieve the target functionality, SA/V ratio, and geometric accuracy. Surfaces with varied SA/V ratios and hierarchy levels were designed and printed. The wettability and antireflection properties of the fabricated surfaces were characterized. It was observed that the wetting and antireflection properties of the 3-level design could be easily tailored by adjusting the design parameter settings and hierarchy levels. Furthermore, the proposed surface structure could change a naturally-hydrophilic surface to near-superhydrophobic. Geometrical light trapping effects were enabled and the antireflection property could be significantly enhanced (>80% less reflection) by the proposed hierarchical surface structures. Experimental results implied the great potential of the proposed surface structures for various applications such as microfluidics, optics, energy, and interfaces.

scholarly journals UV/Vis Light Induced Degradation of Oxytetracycline Hydrochloride Mediated by Co-TiO2 Nanoparticles

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 249 ◽  
Author(s):  
Soukaina Akel ◽  
Redouan Boughaled ◽  
Ralf Dillert ◽  
Mohamed El Azzouzi ◽  
Detlef W. Bahnemann
Keyword(s):  
Surface Area ◽  
Bacterial Infections ◽  
High Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
High Surface ◽  
High Surface Area ◽  
Initial Reaction Rate ◽  
Initial Reaction ◽  
Co Doping ◽  
Vis Spectroscopy

Pharmaceuticals, especially antibiotics, constitute an important group of aquatic contaminants given their environmental impact. Specifically, tetracycline antibiotics (TCs) are produced in great amounts for the treatment of bacterial infections in both human and veterinary medicine. Several studies have shown that, among all antibiotics, oxytetracycline hydrochloride (OTC HCl) is one of the most frequently detected TCs in soil and surface water. The results of the photocatalytic degradation of OTC HCL in aqueous suspensions (30 mg·L−1) of 0.5 wt.% cobalt-doped TiO2 catalysts are reported in this study. The heterogeneous Co-TiO2 photocatalysts were synthesized by two different solvothermal methods. Evonik Degussa Aevoxide P25 and self-prepared TiO2 modified by the same methods were used for comparison. The synthesized photocatalysts were characterized by X-ray powder diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), UV/vis diffuse reflectance spectroscopy (DRS), and N2 adsorption (BET) for specific surface area determination. The XRD and Raman results suggest that Ti4+ was substituted by Co2+ in the TiO2 crystal structure. Uv/visible spectroscopy of Co-TiO2-R showed a substantial redshift in comparison with bare TiO2-R. The photocatalytic performance of the prepared photocatalysts in OTC HCL degradation was investigated employing Uv/vis spectroscopy and high-performance liquid chromatography (HPLC). The observed initial reaction rate over Co-TiO2-R was higher compared with that of Co-TiO2-HT, self-prepared TiO2, and the commercial P25. The enhanced photocatalytic activity was attributed to the high surface area (153 m2·g−1) along with the impurity levels within the band gap (2.93 eV), promoting the charge separation and improving the charge transfer ability. From these experimental results, it can be concluded that Co-doping under reflux demonstrates better photocatalytic performances than with the hydrothermal treatment.

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