scholarly journals Oxygenated boron-doped carbon via polymer dehalogenation as an electrocatalyst for high-efficiency O2 reduction to H2O2

2022 ◽  
Author(s):  
Yingna Chang ◽  
Jiawei Li ◽  
Jun Ma ◽  
Yu Liu ◽  
Rong Xing ◽  
...  
Keyword(s):  
High Efficiency ◽  
Boron Doped ◽  
O2 Reduction

Growth of Thin μc-Si:H on Intrinsic a-Si:H for Solar Cells Application

1996 ◽  
Vol 452 ◽  
Author(s):  
P. Pemet ◽  
M. Goetz ◽  
H. Keppner ◽  
A. Shah
Keyword(s):  
Stainless Steel ◽  
Solar Cells ◽  
Solar Cell ◽  
High Efficiency ◽  
Solar Cell Performance ◽  
Hydrogenated Silicon ◽  
Boron Doped ◽  
High Efficiency Solar Cells ◽  
Amorphous Substrates ◽  
Interface Treatment

AbstractThe <p> μc-SiC:H / <i> a-Si:H junction can be considered to be a sub-system of a n/i/p solar cell. Optimised performance of this junction can be assumed to be a key feature for obtaining high efficiency solar cells.In this paper the authors present results on the conductivity of boron doped microcrystalline hydrogenated silicon (<p> μc-Si:H) thin films deposited on amorphous substrates (e.g. glass or glass/<i> a-Si:H). It is shown that, without any treatment of the substrate or of the underlying surface, the <p> layers showed a strongly reduced conductivity. This indicates either a bad nucleation or a poor microcrystalline behaviour. By using an appropriate surface treatment of the substrate, a gain in photoconductivity of about three orders of magnitude could be obtained (σ > 3 S/cm at a layer thickness of 400Å). We conclude from this, that for thin <p> type μc-Si:H layers the nucleation conditions are essential for obtaining best electric properties of the film w.r.t. solar cell performance.Based on these results, interface treatment was successfully implemented in n/i/p solar cells deposited on TCO coated glass and stainless steel. The results of these experiments are also presented.

scholarly journals Comparative electrode kinetics of micro and nano-crystalline boron doped diamond.

2012 ◽  
Vol 1395 ◽  
Author(s):  
E. Saito ◽  
A.F. Azevedo ◽  
F.A. Souza ◽  
N.G. Ferreira ◽  
M.R. Baldan
Keyword(s):  
High Efficiency ◽  
Electrochemical Impedance ◽  
Differential Capacitance ◽  
Nanocrystalline Diamond ◽  
Boron Doped Diamond ◽  
Transfer Constant ◽  
Raman Scattering Spectroscopy ◽  
Boron Doped ◽  
Nano Crystalline ◽  
Boron Source

ABSTRACTComparative study of boron doped micro/nanocrystalline diamond (BDD/BDND) electrodes was performed using electrochemical impedance spectroscopy measurements (EIS). The morphological and structural characterizations of BDD/BDND films were analyzed by scanning electron microscopy and Raman scattering spectroscopy. The films were grown with different boron amounts added in the feed gas. The boron source for BDND was smaller in concentration than that for BDD sample. Nonetheless, differential capacitance (Mott-Schottky plots) and heterogeneous charge transfer constant results showed similar doping level for both electrodes. This behavior indicated the high efficiency to dope nanocrystalline diamond films.

scholarly journals Laser doping of boron-doped Si paste for high-efficiency silicon solar cells

2015 ◽  
Vol 54 (8S1) ◽  
pp. 08KD06 ◽  
Author(s):  
Yuka Tomizawa ◽  
Tetsuya Imamura ◽  
Masaya Soeda ◽  
Yoshinori Ikeda ◽  
Takashi Shiro
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Silicon Solar Cells ◽  
Laser Doping ◽  
Boron Doped

Cutting Performances of Boron Doped Diamond-Coated Milling Tools in Machining Graphite

2011 ◽  
Vol 697-698 ◽  
pp. 458-461 ◽  
Author(s):  
Liang Wang ◽  
X.L. Lei ◽  
Bin Shen ◽  
Fang Hong Sun ◽  
Z.M. Zhang ◽  
...  
Keyword(s):  
Tool Life ◽  
Vapour Deposition ◽  
High Efficiency ◽  
Flank Wear ◽  
Chemical Vapour ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Hot Filament ◽  
Milling Tools ◽  
Scanning Electron

In this investigation, conventional microcrystalline diamond (MCD) and boron doped diamond (BDD) films are deposited onto commercially available cemented tungsten carbide (WC-Co) Ball-nose endmills by using hot filament chemical vapour deposition (HFCVD). The quality and properties of the as-deposited diamond film are characterized by field emission scanning electron microscope (FESEM) and Raman spectroscopy. Milling tests of graphite materials using MCD, BDD coated and uncoated tool are carried out. Experiment results reveal that BDD films possess higher adhesive strength to the substrate than that of MCD films, and the BDD coated mills allow to be given smaller flank wear and longer tool life, when compared with MCD coated and uncoated WC-Co tools. Cutting performances of WC-Co mills in graphite milling are greatly improved by BDD coating, and typically more than 10 times the tool life is obtained. The research results are of great significance for high efficiency and quality machining of graphite materials.

Tailorable boron-doped carbon nanotubes as high-efficiency counter electrodes for quantum dot sensitized solar cells

2021 ◽  
Author(s):  
Wenhua Li ◽  
Shule Zhang ◽  
Qianqiao Chen ◽  
Qin Zhong
Keyword(s):  
Carbon Nanotubes ◽  
Solar Cells ◽  
Quantum Dot ◽  
High Efficiency ◽  
Cdse Qds ◽  
Counter Electrodes ◽  
Boron Doped ◽  
Excellent Activity ◽  
Sensitized Solar Cells

1. Tunable BCNTs are prepared by the pre-oxidation strategy. 2. B-Doped CNTs exhibit excellent activity for Sn2− reduction. 3. The QDSSC based on CdS/CdSe QDs and BCNT1 shows a PCE of 4.55% under one sunlight illumination.

scholarly journals N-Doped Porous Carbon from Sargassum spp. as Efficient Metal-Free Electrocatalysts for O2 Reduction in Alkaline Fuel Cells

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 346 ◽  
Author(s):  
K. Pérez-Salcedo ◽  
Xuan Shi ◽  
Arunachala Kannan ◽  
Romeli Barbosa ◽  
Patricia Quintana ◽  
...  
Keyword(s):  
Surface Area ◽  
Current Density ◽  
Porous Carbon ◽  
High Efficiency ◽  
High Surface ◽  
High Surface Area ◽  
Membrane Electrode ◽  
Activation Process ◽  
Onset Potential ◽  
O2 Reduction

This work reports the synthesis of N-doped porous carbon (NPC) with a high surface area from Sargassum spp. as a low-cost alternative for electrocatalyst production for the oxygen reduction reaction (ORR). Sargassum spp. was activated with potassium hydroxide at different temperatures (700, 750, and 800 °C) and then doped with pyridine (N700, N750, and N800). As a result of the activation process, the 800 °C sample showed a high surface area (2765 m2 g−1) and good onset potential (0.870 V) and current density (4.87 mA cm−2). The ORR performance of the electrocatalysts in terms of their current density was N800 > N750 > N700 > 750 > 800 > 700, while the onset potential decreased in the following order: N800 > 800 > 750 > 700 > N700 > N750. The fuel cell performance of the membrane electrode assembly (MEA) prepared with electrocatalyst synthesized at 750 °C and doped with pyridine was 12.72 mW cm−2, which was close to that from Pt/C MEA on both the anode and cathode (14.42 mW cm−2). These results indicate that NPCs are an alternative to the problem of Sargassum spp. accumulation in the Caribbean due to their high efficiency as electrocatalysts for ORR.

scholarly journals Study of non fire-through metallization processes of boron-doped polysilicon passivated contacts for high efficiency silicon solar cells

2019 ◽  
Author(s):  
Maxim Hayes ◽  
Benoit Martel ◽  
Sébastien Dubois ◽  
Audrey Morisset ◽  
Olivier Palais
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Silicon Solar Cells ◽  
Boron Doped

Anodic Oxidation of Aqueous Wastes Containing Hydroquinone on BDD Electrode

2015 ◽  
Vol 18 (1) ◽  
Author(s):  
Hassen Trabelsi ◽  
Nasr Bensalah ◽  
Abdellatif Gadri
Keyword(s):  
High Efficiency ◽  
Supporting Electrolyte ◽  
Electrochemical Process ◽  
Applied Current ◽  
Boron Doped Diamond ◽  
Potential Region ◽  
Boron Doped ◽  
Electro Oxidation ◽  
Discontinuous Mode ◽  
Hplc Analyses

AbstractThe electrochemical oxidation of 1,4 dihydroxybenzene, was studied by galvanostatic electrolysis using boron-doped diamond (BDD) as anode. The efficiency of the electrochemical process was found to depend mainly on the pollutant concentration present in the waste and on the applied current density. The voltammetric results showed that hydroquinone oxidation takes place in the same potential region as that of phenol where the supporting electrolyte is stable. Synthetic wastewaters containing hydroquinone have been treated in a bench-scale electrolysis plant. This plant operates in a discontinuous mode by recirculating the waste continuously through a single-chamber electrochemical flow cell. The complete mineralization of hydroquinone and the electro-generated pollutants is obtained in the electrolytic device. HPLC analyses show the formation of carboxylic acids as the main intermediates. The high efficiency of this technology can be explained in terms of the direct electro-oxidation at the BDD surface and the oxidation carried out by hydroxyl radicals and other electro-generated oxidants.

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