Electrochemical performances and gassing behavior of high surface area titanium niobium oxides

2016 ◽  
Vol 4 (29) ◽  
pp. 11531-11541 ◽  
Author(s):  
Lucienne Buannic ◽  
Jean-François Colin ◽  
Marlène Chapuis ◽  
Mohamed Chakir ◽  
Sébastien Patoux
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Electrochemical Performances ◽  
Full Cell ◽  
Niobium Oxides

High surface area TiNb2O7 and Ti2Nb10O29 show improved electrochemical performances, however full cell studies indicate a non-negligible gassing behavior.

High surface area niobium oxides as catalysts for improved hydrogen sorption properties of ball milled MgH2

2008 ◽  
Vol 460 (1-2) ◽  
pp. 507-512 ◽  
Author(s):  
V.V. Bhat ◽  
A. Rougier ◽  
L. Aymard ◽  
G.A. Nazri ◽  
J.-M. Tarascon
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Sorption Properties ◽  
Hydrogen Sorption ◽  
Niobium Oxides

Hierarchical nanosheet-based NiMoO4 nanotubes: synthesis and high supercapacitor performance

2015 ◽  
Vol 3 (2) ◽  
pp. 739-745 ◽  
Author(s):  
Zhuoxun Yin ◽  
Shen Zhang ◽  
Yujin Chen ◽  
Peng Gao ◽  
Chunling Zhu ◽  
...  
Keyword(s):  
Surface Area ◽  
Hydrothermal Treatment ◽  
High Surface ◽  
High Surface Area ◽  
Diffusion Reaction ◽  
Electrochemical Performances ◽  
Reaction Method ◽  
Ultrathin Nanosheets ◽  
Supercapacitor Performance

Hierarchical nanosheet-based NiMoO4 nanotubes with a high surface area of 128.5 m2 g−1, composed of highly ordered ultrathin nanosheets with a thickness of less than 10 nm, were synthesized by a hydrothermal treatment and a subsequent in situ diffusion reaction method, exhibiting excellent electrochemical performances.

scholarly journals Facile synthesis of ultrahigh-surface-area hollow carbon nanospheres for enhanced adsorption and energy storage

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Fei Xu ◽  
Zhiwei Tang ◽  
Siqi Huang ◽  
Luyi Chen ◽  
Yeru Liang ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Electrochemical Performances ◽  
Outer Diameter ◽  
Carbon Nanospheres ◽  
Nanoporous Carbons ◽  
Formidable Challenge ◽  
Enhanced Adsorption ◽  
Hollow Carbon

Abstract Exceptionally large surface area and well-defined nanostructure are both critical in the field of nanoporous carbons for challenging energy and environmental issues. The pursuit of ultrahigh surface area while maintaining definite nanostructure remains a formidable challenge because extensive creation of pores will undoubtedly give rise to the damage of nanostructures, especially below 100 nm. Here we report that high surface area of up to 3,022 m2 g−1 can be achieved for hollow carbon nanospheres with an outer diameter of 69 nm by a simple carbonization procedure with carefully selected carbon precursors and carbonization conditions. The tailor-made pore structure of hollow carbon nanospheres enables target-oriented applications, as exemplified by their enhanced adsorption capability towards organic vapours, and electrochemical performances as electrodes for supercapacitors and sulphur host materials for lithium–sulphur batteries. The facile approach may open the doors for preparation of highly porous carbons with desired nanostructure for numerous applications.

CoOOH ultrafine nanoparticles for supercapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 70947-70951 ◽  
Author(s):  
Wei Wen ◽  
Dong Liang ◽  
Ji-Peng Cheng ◽  
Jin-Ming Wu
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Electrochemical Performances

CoOOH ultrafine nanoparticles with a high surface area were prepared by a novel route to achieve enhanced electrochemical performances.

scholarly journals Carbon Nanotubes-Based Nanomaterials and Their Agricultural and Biotechnological Applications

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1679 ◽  
Author(s):  
Dinesh K. Patel ◽  
Hye-Been Kim ◽  
Sayan Deb Dutta ◽  
Keya Ganguly ◽  
Ki-Taek Lim
Keyword(s):  
Carbon Nanotubes ◽  
Physicochemical Properties ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Synthesis Process ◽  
Laser Vaporization ◽  
Electrochemical Performances ◽  
Advantages And Disadvantages ◽  
Walled Cnts

Carbon nanotubes (CNTs) are considered a promising nanomaterial for diverse applications owing to their attractive physicochemical properties such as high surface area, superior mechanical and thermal strength, electrochemical activity, and so on. Different techniques like arc discharge, laser vaporization, chemical vapor deposition (CVD), and vapor phase growth are explored for the synthesis of CNTs. Each technique has advantages and disadvantages. The physicochemical properties of the synthesized CNTs are profoundly affected by the techniques used in the synthesis process. Here, we briefly described the standard methods applied in the synthesis of CNTs and their use in the agricultural and biotechnological fields. Notably, better seed germination or plant growth was noted in the presence of CNTs than the control. However, the exact mechanism of action is still unclear. Significant improvements in the electrochemical performances have been observed in CNTs-doped electrodes than those of pure. CNTs or their derivatives are also utilized in wastewater treatment. The high surface area and the presence of different functional groups in the functionalized CNTs facilitate the better adsorption of toxic metal ions or other chemical moieties. CNTs or their derivatives can be applied for the storage of hydrogen as an energy source. It has been observed that the temperature widely influences the hydrogen storage ability of CNTs. This review paper highlighted some recent development on electrochemical platforms over single-walled CNTs (SWCNTs), multi-walled CNTs (MWCNTs), and nanocomposites as a promising biomaterial in the field of agriculture and biotechnology. It is possible to tune the properties of carbon-based nanomaterials by functionalization of their structure to use as an engineering toolkit for different applications, including agricultural and biotechnological fields.

SAXS Characterization of Carbon Aerogels for Catalytic Supports

2006 ◽  
Vol 45 ◽  
pp. 1847-1856
Author(s):  
Françoise Ehrburger-Dolle ◽  
Sandrine Berthon-Fabry ◽  
Françoise Bley
Keyword(s):  
Surface Area ◽  
Gas Adsorption ◽  
High Surface ◽  
High Surface Area ◽  
Scale Structure ◽  
Carbon Aerogels ◽  
Electrochemical Performances ◽  
Contrast Variation ◽  
Multi Scale ◽  
X Ray Scattering

Carbon aerogels are very promising substrates for electrocatalyst deposition involved in fuel cells. Their advantage over high surface area carbon blacks currently used, is the porous monolithic structure yielding large pore volumes with controlled pore sizes. By changing the synthesis parameters, it is possible to adjust their multi-scale structure which is strongly related to the electrochemical performances. The aim of the lecture is to give a survey of information about the multi-scale structure that can be obtained by small and wide angle X-ray scattering (SAXS and WAXS) techniques combined with contrast variation (CV). To this end, a series of SAXS experiments on carbon aerogels are described and the analysis of the experimental data is explained. Particular attention is paid to the determination of the specific surface area, SSAXS, and to the reasons why WAXS curves combined to SAXS ones make this determination more pertinent. The physical meaning of similarity or difference between SSAXS and surface area determined by gas adsorption, SADS, is discussed and information obtained by using contrast variation (CV) is described for two carbon aerogels prepared in different conditions.

Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

2019 ◽  
Author(s):  
Kailun Yang ◽  
Recep Kas ◽  
Wilson A. Smith
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Catalyst Layer ◽  
Active Surface ◽  
Active Surface Area ◽  
High Concentration ◽  
Copper Electrodes ◽  
Surface Enhanced ◽  
Local Current

<p>This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO<sub>2</sub> electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO<sub>2</sub> electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO<sub>2</sub> electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer. </p> <p> </p>

scholarly journals Rugae-like FeP nanocrystal assembly on a carbon cloth: an exceptionally efficient and stable cathode for hydrogen evolution

Nanoscale ◽  
2015 ◽  
Vol 7 (25) ◽  
pp. 10974-10981 ◽  
Author(s):  
Xiulin Yang ◽  
Ang-Yu Lu ◽  
Yihan Zhu ◽  
Shixiong Min ◽  
Mohamed Nejib Hedhili ◽  
...  
Keyword(s):  
Gas Phase ◽  
Surface Area ◽  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Efficiency ◽  
Carbon Cloth ◽  
Nanocrystal Assembly

High surface area FeP nanosheets on a carbon cloth were prepared by gas phase phosphidation of electroplated FeOOH, which exhibit exceptionally high catalytic efficiency and stability for hydrogen generation.

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