Stabilizing graphene layers by intercalating laponite between them
Publication date: February 2018 Source:New Carbon Materials, Volume 33, Issue 1 Author(s): Jing Li, Jin-can Cui, Zhen-zhen Yang, Han-xun Qiu, Zhi-hong Tang, Jun-he Yang The reduction of graphene oxide (GO) leads to the re-stacking/agglomeration of graphene layers, which results in their precipitation from an aqueous dispersion. A laponite colloid was used to prevent re-stacking and stabilize an aqueous dispersion of reduced graphene oxide (RGO) by dispersing GO in the colloid, followed by reduction with hydrazine hydrate under microwave radiation. Results indicate that re-stacking is prevented as proven by the disa...
Source: New Carbon Materials - March 23, 2018 Category: Chemistry Source Type: research
Carbon-supported metal single atom catalysts
Publication date: February 2018 Source:New Carbon Materials, Volume 33, Issue 1 Author(s): Hai Li, Hai-xia Zhang, Xiao-li Yan, Bing-she Xu, Jun-jie Guo Metal single atom catalysts (SACs) have been attracting increasing attention in recent years owing to their incredible performance in several key catalytic reactions such as the oxygen reduction reaction and CO oxidation. The construction of well dispersed stable SACs can not only make it possible to understand the catalytic reactions on the atomic scale, but is also important for developing novel industrial catalysts. Recent efforts have been focused on dispersing m...
Source: New Carbon Materials - March 23, 2018 Category: Chemistry Source Type: research
An activated carbon derived from tobacco waste for use as a supercapacitor electrode material
Publication date: December 2017 Source:New Carbon Materials, Volume 32, Issue 6 Author(s): Hui Chen, Yan-chuan Guo, Fu Wang, Gang Wang, Pei-rong Qi, Xu-hong Guo, Bin Dai, Feng Yu A tobacco-derived activated carbon (TAC) was prepared from tobacco waste using KOH activation with a KOH/tobacco carbon mass ratio of 3 at 800 °C for 1 h, and was used as an electrode material for a supercapacitor. The tobacco waste was hydrothermally treated in a 10%(v/v) HCl solution to remove metallic impurities and carbonized before activation. The carbonized tobacco has a low Brunauer-Emmett-Teller (BET) surface area of 111.25 m2·...
Source: New Carbon Materials - February 3, 2018 Category: Chemistry Source Type: research
High-performance flexible wire-shaped electrochemical capacitors based on gold wire@reduced graphene oxide
Publication date: December 2017 Source:New Carbon Materials, Volume 32, Issue 6 Author(s): Yun-zhen Chang, Gao-yi Han, Yao-ming Xiao, Hai-han Zhou, Miao-yu Li, Dong-ying Fu, Wen Zhou Flexible gold @reduced graphene oxide sheathed wires (WAu@rGO) were prepared by soaking a gold wire (100μm in diameter) in the center of glass capillaries with inner diameters of 1.0, 1.3 and 1.8 mm in a suspension of graphene oxide (GO) in a L-ascorbic acid aqueous solution at 30 °C for 48 h. The WAu@rGO wires were obtained after removal of the capillaries, and their microstructures were characterized by SEM and their electrochemic...
Source: New Carbon Materials - February 3, 2018 Category: Chemistry Source Type: research
The influence of conductive additives on the performance of a SiO/C composite anode in lithium-ion batteries
Publication date: December 2017 Source:New Carbon Materials, Volume 32, Issue 6 Author(s): Xin Teng, Hong-liang Xu, Qi Liu, Li-li Shi, Liang Gai, Lei Wang, Yu-sheng Yang, Feng Wu Two conductive additives, carbon black (Super-P) and vapor-grown carbon fibers (VGCFs), were used in 2.5 Ah Li ion batteries using LiCoO2 as the cathode and a SiO/C composite as the anode. The electrode shape, peel strength, electrolyte absorption, electrolyte storage capacity, volume change and the electrochemical performance were investigated. Results indicate that both batteries have high energy densities (more than 600 Wh/L), but the...
Source: New Carbon Materials - February 3, 2018 Category: Chemistry Source Type: research
N, S co-doped porous carbon nanospheres with a high cycling stability for sodium ion batteries
Publication date: December 2017 Source:New Carbon Materials, Volume 32, Issue 6 Author(s): Hong-wei Zhang, Jia-min Lu, Le Yang, Ming-xiang Hu, Zheng-hong Huang, Rui-tao Lu, Fei-yu Kang Developing high-performance and low-cost anode materials is crucial for the practical use of sodium-ion batteries (SIBs) at room-temperature. Porous carbon nanospheres with a uniform diameter for use as SIB anode materials were synthesized by the hydrothermal treatment of glucose to obtain the spheres, and subsequent carbonization and modification with KOH activation and N, S co-doping during or after the activation using thiourea a...
Source: New Carbon Materials - February 3, 2018 Category: Chemistry Source Type: research
SAPO-34 templated growth of hierarchical porous graphene cages as electrocatalysts for both oxygen reduction and evolution
Publication date: December 2017 Source:New Carbon Materials, Volume 32, Issue 6 Author(s): Ling Zhong, Cheng Tang, Bin Wang, Hao-Fan Wang, Shang Gao, Yao Wang, Qiang Zhang Three-dimensional hierarchical porous graphene materials with unique properties are of significant importance for the exploration of advanced electrocatalysts for both the oxygen reduction and evolution reactions (ORR/OER). Templated chemical vapor deposition is a favorable strategy to fabricate this kind of graphene, but the number of effective templates is limited. Here, silicoaluminophosphate (SAPO-34) zeolite crystals were used as the cataly...
Source: New Carbon Materials - February 3, 2018 Category: Chemistry Source Type: research
The structure of an in-situ formed titanium-boron-carbon coating on a graphite substrate
Publication date: October 2017 Source:New Carbon Materials, Volume 32, Issue 5 Author(s): Jin-hua Yang, Quan-gui Guo, Zhan-jun Liu, Hai-peng Qiu, Jian Jiao A titanium-boron-carbon coating was fabricated on a graphite substrate by heating TiB2 powder on a graphite surface above the eutectic temperature. The coating consisted of a pure graphite layer on the outer surface and a TiB2-C alloy layer inside. The graphite layer had many wrinkles due to the difference in the thermal expansion coefficients of TiB2 and graphite. The TiB2-C alloy layer had a continuous three-dimensional interpenetrating network microstructure. ...
Source: New Carbon Materials - December 16, 2017 Category: Chemistry Source Type: research
Microporous activated carbons from coconut shells produced by self-activation using the pyrolysis gases produced from them, that have an excellent electric double layer performance
Publication date: October 2017 Source:New Carbon Materials, Volume 32, Issue 5 Author(s): Kang Sun, Chang-yu Leng, Jian-chun Jiang, Quan Bu, Guan-feng Lin, Xin-cheng Lu, Guang-zhen Zhu Coconut shell-based activated carbons were prepared by self-activation using the pyrolysis gases generated from them. The process was carried out at high temperatures in a closed reactor filled with coconut shell under a high pressure that was generated by pyrolysis gases. Results indicate that the activated carbon prepared at 900 °C for 6h has a specific surface area, total pore volume, micropore percentage, iodine adsorption capa...
Source: New Carbon Materials - December 16, 2017 Category: Chemistry Source Type: research
The effect of nitrogen and/or boron doping on the electrochemical performance of non-caking coal-derived activated carbons for use as supercapacitor electrodes
Publication date: October 2017 Source:New Carbon Materials, Volume 32, Issue 5 Author(s): Qian Lu, Yuan-yuan Xu, Sha-jiang Mu, Wen-cui Li Coal-based activated carbons doped with either N or B or a combination of the two were prepared for use as the electrode materials of supercapacitors by ball milling and subsequent activation using Xinjiang non-caking coal, melamine and boric acid as the respective carbon, nitrogen and boron sources. FTIR spectroscopy and XPS reveal that the B and N atoms are substitutionally incorporated into the carbon skeleton. These doped activated carbons contain a large number of mesopores. C...
Source: New Carbon Materials - December 16, 2017 Category: Chemistry Source Type: research
An arm-like electrothermal actuator based on superaligned carbon nanotube/polymer composites
Publication date: October 2017 Source:New Carbon Materials, Volume 32, Issue 5 Author(s): Zhi-wei Zhou, Qin-hua Yan, Chang-hong Liu, Shou-shan Fan A superaligned carbon nanotube film embedded in polymers shows promising applications in the fields of electrothermal actuation because of their homogenous conductivity, good biocompatibility and mechanical properties. We fabricated a simple U-shaped gadget from the composite to investigate the electrothermal actuation mechanism. The gadget can curl to 730°, which is several times larger than existing actuators. A helix-shaped arm-like actuator (artificial arm) was also m...
Source: New Carbon Materials - December 16, 2017 Category: Chemistry Source Type: research
Barium (II)-doped zinc ferrite-reduced graphene oxide nanohybrids for superior adsorption and magnetic properties
Publication date: October 2017 Source:New Carbon Materials, Volume 32, Issue 5 Author(s): Peng Fei, Jun Qiao, Jin-xian Huo, Jian-hong Liu, Ming Zhong, Bi-tao Su A one-step solvothermal method was used to prepare barium (II)-doped zinc ferrite/reduced graphene oxide (Ba2+-ZF/rGO) magnetic nanohybrid adsorbents. During the solvothermal treatment, Ba2+-ZF nanoparticles were formed from Ba2+, Fe3+and Zn2+ chlorides, which were anchored on the surface of rGO obtained from the reduction of GO with ethylene glycol. TEM and SEM results show that the Ba2+-ZF nanoparticles are uniformly distributed on the rGO sheets without ...
Source: New Carbon Materials - December 16, 2017 Category: Chemistry Source Type: research
The use of carbon quantum dots as fluorescent materials in white LEDs
Publication date: October 2017 Source:New Carbon Materials, Volume 32, Issue 5 Author(s): Bo Cui, Xiao-ting Feng, Feng Zhang, Ya-ling Wang, Xu-guang Liu, Yong-zhen Yang, Hu-sheng Jia Carbon quantum dots (CQDs) have attracted a lot of attention for their potential applications in light-emitting diodes (LEDs), ion detection, bioimaging, solar technology and photocatalysis. Among these, LEDs, mainly white LEDs, have become a research focus and have developed rapidly. Recent advances in white LEDs constructed from different fluorescent materials, including the CQD-containing composites and single CQDs, are described. ...
Source: New Carbon Materials - December 16, 2017 Category: Chemistry Source Type: research
Synthesis of nitrogen-doped graphitic carbon nanocapsules from a poly(ionic liquid) for CO2 capture
Publication date: August 2017 Source:New Carbon Materials, Volume 32, Issue 4 Author(s): Lei Liu, Juan Lu, Yi-xin Zhang, Meng Liu, Yi-feng Yu, Ai-bing Chen A poly(ionic liquid) was prepared from an ionic liquid monomer that was obtained by the reaction of 1-vinylimidazole, 4-vinyl-benzene chloride with 2,6-di-tert-butyl-4-methylphenol. The poly(ionic liquid) was mixed with K3[Fe(CN)6] and a 5 nm silica colloidal sol, carbonized at 900 °C for 4h, and sequentially treated with HNO3 and NaOH to remove the iron and silica to obtain nitrogen-doped graphitic carbon nanocapsules. The iron and silica acted as a graphitiza...
Source: New Carbon Materials - November 8, 2017 Category: Chemistry Source Type: research
Ablation performance of a 4D-braided C/C composite in a parameter-variable channel of a Laval nozzle in a solid rocket motor
Publication date: August 2017 Source:New Carbon Materials, Volume 32, Issue 4 Author(s): Wei-hua Hui, Fu-ting Bao, Xiang-geng Wei, Yang Liu Ablation of a 4D-braided C/C composite fabricated with axial rods in the parameter-variable channel of a Laval nozzle (or a convergent-divergent nozzle, a tube that is pinched in the middle) was performed in the experimental conditions of a solid rocket motor. Gas-solid flow and erosion were also simulated with the discrete phase model. The ablation of the composite was caused by thermochemical and mechanical erosion and was analyzed based on the morphology of different sections ...
Source: New Carbon Materials - November 8, 2017 Category: Chemistry Source Type: research
