A modified “gel-blowing” strategy toward the one-step mass production of a 3D N-doped carbon nanosheet@carbon nanotube hybrid network for supercapacitors

Nanoscale ◽  
2019 ◽  
Vol 11 (16) ◽  
pp. 7624-7633 ◽  
Author(s):  
Weiwei Zhou ◽  
Yu Du ◽  
Jinjue Zeng ◽  
Fei Liu ◽  
Yongming Zhu
Keyword(s):  
Carbon Nanotube ◽  
Mass Production ◽  
Large Scale ◽  
Hybrid Network ◽  
Carbon Nanosheets ◽  
One Step ◽  
Large Scale Synthesis ◽  
The One

We have realized the synchronous and large-scale synthesis of 1D CNTs on 2D N-doped carbon nanosheets (NCNS) by a one-step annealing of a gel precursor.

One-step, Large-Scale Synthesis of Isotruxene

2018 ◽  
Vol 42 (11) ◽  
pp. 556-557 ◽  
Author(s):  
Cen Zhou ◽  
Wei Xuan ◽  
Shi-Peng Luo ◽  
Yue-Hua Bao
Keyword(s):  
Large Scale ◽  
Separation Procedure ◽  
One Step ◽  
Large Scale Synthesis ◽  
The One

A concise procedure for the one-step synthesis of isotruxene has been developed. Isotruxene is obtained in around 60% yield on a 150-gram scale through acid-catalysed cyclotrimerisation of equimolar amounts of 1-indanone and 2-indanone. The separation procedure is convenient and is based on different solubilities between isotruxene and side products.

Global Reaction Model to Describe the Kinetics of Catalytic Pyrolysis of Coffee Grounds Waste

2017 ◽  
Vol 899 ◽  
pp. 173-178 ◽  
Author(s):  
Ronydes Batista Jr. ◽  
Bruna Sene Alves Araújo ◽  
Pedro Ivo Brandão e Melo Franco ◽  
Beatriz Cristina Silvério ◽  
Sandra Cristina Danta ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Large Scale ◽  
Catalytic Pyrolysis ◽  
Petroleum Products ◽  
Reaction Model ◽  
Heating Rates ◽  
Coffee Grounds ◽  
One Step ◽  
Global Reaction ◽  
The One

In view of the constant search for new sources of renewable energy, the particulate agro-industrial waste reuse emerges as an advantageous alternative. However, despite the advantages of using the biomass as an energy source, there is still strong resistance as the large-scale replacement of petroleum products due to the lack of scientifically proven efficient conversion technologies. In this context, the pyrolysis is presented as one of the most widely used thermal decomposition processes. The knowledge of aspects of chemical kinetics, thermodynamics these will, heat and mass transfer, are so important, since influence the quality of the product. This paper presents a kinetic study of slow pyrolysis of coffee grounds waste from dynamic thermogravimetric experiments (TG), using different powder catalysts. The primary thermal decomposition was described by the one-step reaction model, which considers a single global reaction. The kinetic parameters were estimated using nonlinear regression and the differential evolution method. The coffee ground waste was dried at 105°C for 24 hours. The sample in nature was analyzed at different heating rates, being 10, 15, 20, 30 and 50 K/min. In the catalytic pyrolysis, about 5% (w/w) of catalyst were added to the sample, at a heating rate of 30 K/min. The results show that the one-step model does not accurately represent the data of weight loss (TG) and its derivative (DTG), but can do an estimative of the activation energy reaction, and can show the differences caused by the catalysts. Although no one can say anything about the products formed with the addition of the catalyst, it would be necessary to micro-pyrolysis analysis, we can say the influence of the catalyst in the samples, based on the data obtained in thermogravimetric tests.

Facile large-scale synthesis of macroscopic 3D porous graphene-like carbon nanosheets architecture for efficient CO2 adsorption

Carbon ◽  
2019 ◽  
Vol 145 ◽  
pp. 751-756 ◽  
Author(s):  
Zhangfeng Shen ◽  
Chenglu Liu ◽  
Chaochuang Yin ◽  
Shifei Kang ◽  
Yanan Liu ◽  
...  
Keyword(s):  
Large Scale ◽  
Co2 Adsorption ◽  
Carbon Nanosheets ◽  
Porous Graphene ◽  
Large Scale Synthesis

An approach combining additive manufacturing and dielectrophoresis for 3D-structured flexible lead-free piezoelectric composites for electromechanical energy conversion

2021 ◽  
Author(s):  
Zehuan Wang ◽  
Jin Cheng ◽  
Renchao Hu ◽  
Xiaoting Yuan ◽  
Zhonghui Yu ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Large Scale ◽  
Lead Free ◽  
Piezoelectric Composites ◽  
Additive Manufacturing Technology ◽  
Electromechanical Energy Conversion ◽  
Electromechanical Energy ◽  
One Step ◽  
The One ◽  
Piezoelectric Devices

Additive manufacturing technology has promoted the development of piezoelectric devices, from the one-step moulding of micro-miniature devices to large-scale devices.

scholarly journals Improving the Activity of Fe/C/N ORR Electrocatalyst Using Double Ammonia Promoted CO2 Laser Pyrolysis

2020 ◽  
Vol 6 (4) ◽  
pp. 63
Author(s):  
Henri Perez ◽  
Mathieu Frégnaux ◽  
Emeline Charon ◽  
Arnaud Etcheberry ◽  
Olivier Sublemontier
Keyword(s):  
Co2 Laser ◽  
Large Scale ◽  
Laser Energy ◽  
Reduction Reaction ◽  
Laser Pyrolysis ◽  
Highly Active ◽  
One Step ◽  
Orr Activity ◽  
Set Up ◽  
The One

Recently, we reported the use of CO2 laser pyrolysis for the synthesis of promising Fe/C/N electrocatalysts for Oxygen Reduction Reaction (ORR) in fuel cells. The set-up used single laser pyrolysis of an aerosolized solution of iron acetylacetonate in toluene with ammonia, both as laser energy transfer agent and nitrogen source. In the present paper, we investigate the effect of a second ammonia promoted CO2 laser pyrolysis on the feature and ORR activity of Fe/C/N electrocatalysts. Indeed, compared to single pyrolysis, the second ammonia promoted CO2 laser pyrolysis could be an interesting way to synthesize in one-step performing ORR electrocatalysts on a large scale. For this comparison, a two-stage reactor was built, allowing both single ammonia-induced CO2 laser pyrolysis as reported previously or double ammonia-induced CO2 laser pyrolysis. In the latter configuration, the catalyst nanopowder flow is formed at the first stage of the reactor, then mixed with a second ammonia flow and allowed to cross a second CO2 laser beam, thus undergoing a second ammonia-induced CO2 laser pyrolysis before being collected on filters. It is found that the second ammonia-induced CO2 laser pyrolysis significantly improves the ORR performances of the materials prepared by single CO2 laser pyrolysis. The effect is demonstrated for three different catalysts for which the onset potentials for the ORR from single-stage to double-stage configuration increase from 625 mV to 845 mV, 790 mV to 860 mV, and 800 mV to 885 mV, respectively. The selectivity of the ORR was determined at 600 mV/SHE and lie between 3.41 and 3.72. These promising performances suggesting potentialities for the one-step formation of highly active Fe/C/N ORR electrocatalysts are discussed, based on results of surface analysis by XPS, specific surface area measurements, and Raman spectroscopy.

A Simple and Effective Method for the Preparation of Porous Graphene Nanosheets

2015 ◽  
Vol 719-720 ◽  
pp. 123-126
Author(s):  
Jin Sun ◽  
Qing Zhong Xue ◽  
Yong Gang Du ◽  
Fu Jun Xia ◽  
Qi Kai Guo
Keyword(s):  
Large Scale ◽  
Graphene Nanosheets ◽  
Scale Production ◽  
Green Method ◽  
Porous Graphene ◽  
Large Scale Production ◽  
Potential Applications ◽  
One Step ◽  
Autogenous Pressure ◽  
The One

Porous graphene is a collection of graphene-related materials which exhibits properties distinct from those of graphene, and it has widespread potential applications in various fields. Several approaches have been developed to produce porous graphene. However, the large-scale production of porous graphene nanosheets still remains a great challenge. Moreover, the costs of some methods are prohibitive for its commercial production and the processes are too complicated and time-consuming. In this work, we propose a simple and green method by which graphene nanosheets can be etched by sodium hydroxide under autogenous pressure at 180 °C. The morphologies and surface elements of the porous graphene nanosheets and sizes of pores were characterized. It is demonstrated that the one-step etching of graphene nanosheets is an effective method to obtain large-scale porous graphene nanosheets with high and uniform porosity. The pores in the porous graphene nanosheets were 6 nm depth (the same as the thickness of the graphene nanosheets) and 30-50 nm width.

scholarly journals Ensemble Kalman Filtering with One-Step-Ahead Smoothing

2018 ◽  
Vol 146 (2) ◽  
pp. 561-581 ◽  
Author(s):  
Naila F. Raboudi ◽  
Boujemaa Ait-El-Fquih ◽  
Ibrahim Hoteit
Keyword(s):  
Data Assimilation ◽  
Large Scale ◽  
Sequential Data ◽  
Bayesian Filtering ◽  
Error Statistics ◽  
Background Error ◽  
One Step ◽  
The One ◽  
Lorenz 96 ◽  
Ensemble Kalman Filtering

The ensemble Kalman filter (EnKF) is widely used for sequential data assimilation. It operates as a succession of forecast and analysis steps. In realistic large-scale applications, EnKFs are implemented with small ensembles and poorly known model error statistics. This limits their representativeness of the background error covariances and, thus, their performance. This work explores the efficiency of the one-step-ahead (OSA) smoothing formulation of the Bayesian filtering problem to enhance the data assimilation performance of EnKFs. Filtering with OSA smoothing introduces an updated step with future observations, conditioning the ensemble sampling with more information. This should provide an improved background ensemble in the analysis step, which may help to mitigate the suboptimal character of EnKF-based methods. Here, the authors demonstrate the efficiency of a stochastic EnKF with OSA smoothing for state estimation. They then introduce a deterministic-like EnKF-OSA based on the singular evolutive interpolated ensemble Kalman (SEIK) filter. The authors show that the proposed SEIK-OSA outperforms both SEIK, as it efficiently exploits the data twice, and the stochastic EnKF-OSA, as it avoids observational error undersampling. They present extensive assimilation results from numerical experiments conducted with the Lorenz-96 model to demonstrate SEIK-OSA’s capabilities.

Large-scale synthesis and HRTEM analysis of single-walled B- and N-doped carbon nanotube bundles

Carbon ◽  
2000 ◽  
Vol 38 (14) ◽  
pp. 2017-2027 ◽  
Author(s):  
D. Golberg ◽  
Y. Bando ◽  
L. Bourgeois ◽  
K. Kurashima ◽  
T. Sato
Keyword(s):  
Carbon Nanotube ◽  
Large Scale ◽  
Nanotube Bundles ◽  
Large Scale Synthesis
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