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carbon doping

Ken-Ichi Saitow, Yufeng Wang, Shintaro Takahashi
Nitrogen and carbon co-doped TiO2 particles with a brilliant yellow-orange color were produced mechanochemically by high-energy ball milling as one-pot synthesis. This facile synthesis required only grinding TiO2 with melamine at room temperature. Using monochoromatic lights with the same intensity in visible and UV, the photocatalytic activity of the TiO2 particles was accurately evaluated with respect to the degradation of an aqueous dye (methylene blue) solution. The activities under visible light (450 and 500 nm) were, respectively, 4 and 2 times higher than that of the unmilled TiO2 under UV light (377 nm), corresponding to 9 and 5 times higher than the UV under the solar light condition...
October 19, 2018: Scientific Reports
Rong Tang, Renli Ding, Xianchuan Xie
A novel metal-free oxygen-doped graphitic carbon nitride (O-g-C3 N4 ) was synthesized by the pre-treatment of bulk graphitic carbon nitride (g-C3 N4 ) with hydrogen peroxide (H2 O2 ), and combined with high-temperature calcination treatment. The obtained 2-O-g-C3 N4 catalyst exhibits high activity in visible light photocatalytic degradation of bisphenol A (BPA) with a mineralization rate as high as 62.3%. According to the characterization results of X-ray diffraction, transmission electron microscopy, UV-visible spectroscopy, Brunauer-Emmett-Teller and photoluminescence spectroscopy analyses, the markedly higher visible-light-driven oxidation activity of 2-O-g-C3 N4 is attributed to the larger specific surface area, wider range of light responses and low charge recombination rate...
October 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Shan Wu, Xuelin Yang, Haishan Zhang, Lin Shi, Qing Zhang, Qiuyu Shang, Zeming Qi, Yue Xu, Jie Zhang, Ning Tang, Xinqiang Wang, Weikun Ge, Ke Xu, Bo Shen
Carbon (C) doping is essential for producing semi-insulating GaN for power electronics. However, to date the nature of C doped GaN, especially the lattice site occupation, is not yet well understood. In this work, we clarify the lattice site of C in GaN using polarized Fourier-transform infrared and Raman spectroscopies, in combination with first-principles calculations. Two local vibrational modes (LVMs) at 766 and 774  cm^{-1} in C doped GaN are observed. The 766  cm^{-1} mode is assigned to the nondegenerate A_{1} mode vibrating along the c axis, whereas the 774  cm^{-1} mode is ascribed to the doubly degenerate E mode confined in the plane perpendicular to the c axis...
October 5, 2018: Physical Review Letters
Binbin Jiang, Tao Wang, Yafei Cheng, Fan Liao, Konglin Wu, Mingwang Shao
Nitrogen doped graphene (NG) chemically coupled with graphitic carbon nitride (g-C3N4) may facilitate the kinetics of overall electrochemical water splitting. Herein, a facile strategy is adopted to synthesize monodispersed Ir nanoparticles on g-C3N4/NG layers. Benefiting from the synergistic effect between different components of the catalyst, the optimal Ir/g-C3N4/NG catalyst with low content of Ir, (5.9 wt%) exhibits highly active for electrochemical water splitting in acidic electrolyte. Specifically, as a HER catalyst, the optimal Ir/g-C3N4/NG exhibits Tafel slope of 22 mV•dec-1...
October 19, 2018: ACS Applied Materials & Interfaces
Sha Zeng, Xiao Tong, Susheng Zhou, Bo Lv, Jian Qiao, Yanhui Song, Minghai Chen, Jiangtao Di, Qingwen Li
As a promising energy-storage device, rechargeable Zn-air batteries have attracted considerable interests. Herein, a bifunctional oxygen electrode film prepared by adhering NiCo2 O4 nanosheets to a nitrogen and oxygen dual-doped carbon nanotubes film in a large scale is reported. The resulting self-supporting film electrode is multifunctional, which integrates a porous conducting structure for air diffusion and charge transfer, high-performance catalysts for oxygen reduction and evolution, and novel structural flexibility...
October 17, 2018: Small
Yaqin Wang, Xinxin Xu, Luyao Liu, Jin Chen, Guimei Shi
Zn-air batteries, promising energy storage equipment with high energy density, light weight and a compact structure, are a perfect power source for electric vehicles. For a Zn-air battery, the activity of the air cathode electrocatalyst plays an important role in its performance. Here, employing a coordination polymer as a precursor, a composite material built from Co3O4 and Co-N active centres with nitrogen-doped mesoporous carbon as a matrix has been synthesized successfully. This composite material possesses outstanding activity and stability in the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) processes...
October 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Min Jiang, Jun Li, Xiaofan Cai, Yu Zhao, Lijia Pan, Qingqi Cao, Dunhui Wang, Youwei Du
The development of noble-metal-free highly efficient oxygen evolution reaction (OER) catalysts is crucial for electrochemical energy technology but still challenging. Herein, ultrafine cobalt-iron bimetallic phosphide nanoparticles embedded in carbon nanosheets are synthesized using two-dimensional (2D) metal-organic frameworks (MOFs) as the precursor. The 2D morphology of the carbon matrix and the ultrafine character of Co1-xFexP nanoparticles make contributions to OER catalysis. By optimizing the molar ratio of Co/Fe atoms in MOFs, a series of Co1-xFexP/C catalysts are prepared...
October 17, 2018: Nanoscale
Jae-Yeop Kim, Jun-Hyun Mo, Young Hun Kang, Song Yun Cho, Kwang-Suk Jang
High-performance thermoelectric composite fibers were prepared via simple wet-spinning of single-walled carbon nanotube (SWCNT)/poly(vinylidene fluoride) (PVDF) pastes using a common solvent/coagulation system. By improving the content and dispersion state of SWCNTs in the composite fibers, the thermoelectric performance could be effectively enhanced. With n-type doping of SWCNTs using polyethylenimine, high-performance n-type SWCNT/PVDF composite fibers could be prepared. The power factors of the p- and n-type SWCNT/PVDF composite fibers with the SWCNT content of 50 wt% were 378 ± 56 and 289 ± 98 μW m-1 K-2, respectively...
October 17, 2018: Nanoscale
Megha A Deshmukh, Gajanan A Bodkhe, Sumedh Shirsat, Arunas Ramanavicius, Mahendra D Shirsat
Heavy metal ions are considered as one of the major water pollutants, revealing health hazards as well as threat to the ecosystem. Therefore, investigation of most versatile materials for the sensitive and selective detection of heavy metal ions is need of the hour. Proposed work emphasizes the synthesis of conducting polymer and carbon nanotube nanocomposite modified with chelating ligand for the detection of heavy metal ions. Carbon nanotubes are having well known features such as tuneable conductivity, low density, good charge transport ability, and current carrying capacity...
2018: Frontiers in Chemistry
László Vanyorek, Gábor Muranszky, Emőoke Sikora, Xénia Pénzeli, Ádám Prekob, Adrienn Kiss, Béla Fiser, Béla Viskolcz
Nitrogen-doped bamboo-shaped carbon nanotubes (N-BCNT) were synthesized from butylamine using the catalytic chemical vapor deposition (CCVD) process. The carbon source was nitrogen content organic molecules, namely butylamine. Reaction conditions such as temperature, amount of carbon source and catalyst were optimized to produce high quality N-BCNT samples. The nitrogen content was measured by CHNS element analysis, while the butylamine conversion was calculated based on the weight of deposited carbon materials...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Qian Yuan Shan, Bo Guan, Jun Ming Zhang, Fan Dong, Xiao Ying Liu, Yu Xin Zhang
The rational design and synthesis of electrode materials with large specific capacitance and good cycling stability have gained tremendous attention but remained as a challenge. Herein, NiCo₂O₄@g-C₃N₄(C) hybrid was synthesized by growing spinel nickel cobaltite (NiCo₂O₄) on the carbon doped graphitic carbon nitride (g-C₃N₄(C)). The elegant synergy between NiCo₂O₄ and g-C₃N₄(C) leads to a high specific capacitance of 325.7 F·g-1 at the current density of 1 A·g-1 and an exceptional cycling stability (93...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Zhaodi Huang, Jianhua Liu, Zhenyu Xiao, Hui Fu, Weidong Fan, Ben Xu, Bin Dong, Di Liu, Fangna Dai, Daofeng Sun
A coral-like NiSe@NC nanohybrid as an effective electrocatalyst for the hydrogen evolution reaction (HER) at all pH values, constructed via the in situ selenation of a Ni-MOFs precursor, is reported. The electrocatalyst shows overpotentials of 123 mV, 250 mV and 300 mV in 0.5 M H2SO4, 1.0 M KOH and 1.0 M PBS, respectively, to afford a current density of 10 mA cm-2. Meanwhile, NiSe@NC also exhibits a small Tafel slope and superior long-term stability over a wide pH range. The excellent electrocatalytic performance should be ascribed to the unique coral-like structure with a large BET specific surface area (125...
October 16, 2018: Nanoscale
Xin-Lu Liu, Hong-Fei Yao, Mei-Hong Chai, Wei He, Yan-Ping Huang, Zhao-Sheng Liu
The facile fabrication of single-walled carbon nanotubes (SWCNTs)-doping molecularly imprinted polymer (MIP) nanocomposite-based binary green porogen system, room-temperature ionic liquids (RTILs), and deep eutectic solvents (DESs) was developed for drug delivery system. With fenbufen (FB) as template molecule, 4-vinylpyridine (4-VP) was used as functional monomer, ethylene glycol dimethacrylate as cross-linking monomer, and 1-butyl-3-methylimidazoliumtetrafluoroborate and choline chloride/ethylene glycol as binary green solvent, in the presence of SWCNTs...
October 15, 2018: AAPS PharmSciTech
Emőke Sikora, Ádám Prekob, Gyula Halasi, László Vanyorek, Péter Pekker, Ferenc Kristály, Tamás Varga, János Kiss, Zoltán Kónya, Béla Viskolcz
Nitrogen-doped, bamboo-like carbon nanotubes (BCNTs) were synthesized from butylamine by catalytic chemical vapor deposition (CCVD method). The nanotubes were oxidized by H2 SO4 /HNO3 treatment and used to prepare calcium alginate gelled BCNT spheres. These beads were first carbonized and then Pd, Rh and Ni nanoparticles were anchored on the surface of the spheres. These systems were then applied as catalysts in CO2 hydrogenation. The BCNT support was examined by Raman spectroscopy, dynamic light scattering (DLS) and X-ray photoelectron spectroscopy (XPS)...
October 2018: ChemistryOpen
Jinli Qiu, Fuqiang Liu, Cailiang Yue, Chen Ling, Aimin Li
A novel nanosheet of Mo/N-codoped TiO2 nanorods immobilized on carbon nanofibers (MNTC nanosheet) was self-synthesized through two facile steps. The Mo/N-doped TiO2 nanorods dispersed through in situ growth on the network constructed by long and vertical carbon nanofibers (CNFs). The fabricated MNTC nanosheet displayed superb photocatalytic activity of methylene blue (MB), and the degradation ratio by the MNTC nanosheet was nearly twice than that of pure nanoparticles. The photocatalytic activities during the degradation process in the presence of environmental media such as inorganic salts and natural organic matter (NOM) were also determined...
October 8, 2018: Chemosphere
Zhongben Pan, Yicheng Wang, Yongguang Zhao, Maciej Kowalczyk, Jarosław Sotor, Hualei Yuan, Yan Zhang, Xiaojun Dai, Huaqiang Cai, Ji Eun Bae, Sun Young Choi, Fabian Rotermund, Pavel Loiko, Josep Maria Serres, Xavier Mateos, Uwe Griebner, Valentin Petrov
We demonstrate a mode-locked (ML) femtosecond laser based on the disordered garnet crystal Tm,Ho:CNGG. Employing a single-walled carbon nanotube saturable absorber, pulses as short as 83 and 76 fs at 2081 nm are achieved without and with external compression, respectively. The latter represents, to the best of our knowledge, the shortest pulse duration obtained from any Ho-doped or Tm,Ho-codoped laser. The average power amounts to 67 mW at a repetition rate of 102 MHz. By analyzing the soliton ML regime, the nonlinear refractive index of Tm,Ho:CNGG is estimated to be ∼1...
October 15, 2018: Optics Letters
Zhijun Guo, Xiaoyu Feng, Xingxing Li, Xuming Zhang, Xiang Peng, Hao Song, Jijiang Fu, Kang Ding, Xian Huang, Biao Gao
Lithium-sulfur batteries (LSBs), with large specific capacity (1,675 mAh g-1 ), are regarded as the most likely alternative to the traditional Lithium-ion batteries. However, the intrinsical insulation and dramatic volume change of sulfur, as well as serious shuttle effect of polysulfides hinder their practical implementation. Herein, we develop three-dimensional micron flowers assembled by nitrogen doped carbon (NC) nanosheets with sulfur encapsulated (S@NC-NSs) as a promising cathode for Li-S to overcome the forementioned obstacles...
2018: Frontiers in Chemistry
Shang-Yu Yu, Gautier Schrodj, Karine Mougin, Joseph Dentzer, Jean-Pierre Malval, Hsiao-Wen Zan, Olivier Soppera, Arnaud Spangenberg
Metal oxides are an important class of materials for optoelectronic applications. In this context, developing simple and versatile processes for integrating these materials at the microscale and nanoscale has become increasingly important. One of the major remaining challenges is to control the microstructuration and electro-optical properties in a single step. It is shown here that near-infrared femtosecond laser irradiation can be successfully used to prepare amorphous or crystallized TiO2 microstructures in a single step using a direct laser writing (DLW) approach from a TiO2 precursor thin film doped with a suitable dye...
October 15, 2018: Advanced Materials
Md Selim Arif Sher Shah, Jooyoung Lee, Ali Rauf, Jong Hyeok Park, Byungkwon Lim, Pil J Yoo
Pt, a representative electrocatalyst for the oxygen reduction reaction (ORR), has suffered from high cost and poor stability, and thus it is essential to develop alternative electrocatalyst with a high catalytic activity comparable to Pt. Herein, we propose a rationally designed metal-free electrocatalyst with exposed active sites using an N, P, and S ternary-doped and graphene-incorporated porous carbon foam. We developed a novel template-free synthetic approach wherein the electrostatically-mediated complexation of graphene oxide (GO) with 2-aminothiazole (2AT) and branched polyethylenimine (PEI) in the presence of phytic acid (PA) was first induced, followed by a carbonization process to drive the formation of a three-dimensionally interconnected porous carbon foam...
October 15, 2018: Nanoscale
Hui-Juan Zhang, Sunwu Yao, Jing Geng, Zi-Feng Ma, Junhe Yang
In this study, we successfully demonstrate an efficient, metal-free nitrogen, fluoride-codoped carbon (NFC) oxygen reduction reaction (ORR) electrocatalyst, which is produced by directly pyrolyzing melamine hydrogen fluoride salt (using as a single N and F precursor for the first time) mixed with carbon black BP2000 in a N2 atmosphere. The ORR electrocatalytic performances are evaluated by rotating ring disk electrode experiments in 0.1 M KOH. The NFC electrocatalyst prepared at the optimized temperature of 1000 °C (NFC1000) demonstrates a high ORR electrocatalytic activity with a peak potential of 0...
October 9, 2018: Journal of Colloid and Interface Science
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