scholarly journals Anodic CaO-TiO2Nanotubes Composite Film for Low Temperature CO2Adsorption

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Chin Wei Lai
Keyword(s):  
Low Temperature ◽  
Composite Film ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Anodic Oxidation ◽  
Active Surface ◽  
Optimum Concentration ◽  
Electrochemical Anodization ◽  
Active Surface Area ◽  
One Dimensional

A novel one-dimensional anodic CaO-TiO2nanotubes composite film was prepared using a rapid-anodic oxidation electrochemical anodization technique for low temperature CO2absorption application. This study aims to determine the optimum concentration of Ca(NO3)2·4H2O used as the CaO precursor for loading CaO species on TiO2nanotubes. In this study, an optimum content of CaO on TiO2nanotubes (0.15 at% of Ca element) could enhance the CO2adsorption capacity up to 2.45 mmol/g at 400°C. This behavior was attributed to the large active surface area of CaO species were covered on the surface of TiO2nanotubes. The conversion of CaO into CaCO3could be achieved effectively for CO2absorption during the carbonate looping process.

scholarly journals Modification of One-Dimensional TiO2Nanotubes with CaO Dopants for High CO2Adsorption

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Chin Wei Lai
Keyword(s):  
Nitrate Solution ◽  
Calcium Nitrate ◽  
Active Surface ◽  
Electrochemical Anodization ◽  
Active Surface Area ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Calcium Source ◽  
Field Emission Microscopy

One-dimensional calcium oxide (CaO-) based titanium dioxide (TiO2) nanotubes were successfully synthesized through a rapid electrochemical anodization and chemical wet impregnation techniques. In this study, calcium nitrate solution was used as a calcium source precursor. The reaction time and concentration of calcium source on the formation of CaO-TiO2nanotubes were investigated using field emission microscopy, energy dispersion X-ray spectroscopy, and X-ray diffraction. The adsorption capacity of CO2was determined by thermal gravimetric analyzer. A maximum of 4.45 mmol/g was achieved from the CaO-TiO2nanotubes (6.64 at% of Ca). The finding was attributed to the higher active surface area for CaO to adsorb more CO2gas and then formed CaCO3compound during cyclic carbonation-calcination reaction.

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>

Increasing Active Surface Area to Fabricate Ultra-Hydrophobic Surface by Using “Black Silicon” with Bosch Etching Process

2012 ◽  
Vol 12 (6) ◽  
pp. 4919-4927 ◽  
Author(s):  
Nithi Atthi ◽  
Jakrapong Supadech ◽  
Gaetan Dupuy ◽  
On-uma Nimittrakoolchai ◽  
Apirak Pankiew ◽  
...  
Keyword(s):  
Surface Area ◽  
Hydrophobic Surface ◽  
Active Surface ◽  
Etching Process ◽  
Black Silicon ◽  
Active Surface Area

Facile deposition of Pt nanoparticles on Sb-doped SnO2 support with outstanding active surface area for the oxygen reduction reaction

2018 ◽  
Vol 8 (10) ◽  
pp. 2672-2685 ◽  
Author(s):  
Rhiyaad Mohamed ◽  
Tobias Binninger ◽  
Patricia J. Kooyman ◽  
Armin Hoell ◽  
Emiliana Fabbri ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Surface Area ◽  
Pt Nanoparticles ◽  
Active Surface ◽  
Reduction Reaction ◽  
Active Surface Area

Synthesis of Sb–SnO2 supported Pt nanoparticles with an outstanding ECSA for the oxygen reduction reaction.

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