scholarly journals An improved method of water electrolysis – effect of complexing agent

2016 ◽  
Vol 6 (3) ◽  
pp. 215 ◽  
Author(s):  
Seetharaman Swaminathan ◽  
Balaji Rengarajan ◽  
Ramya Krishnan ◽  
Kaveripatnam Samban Dhathathreyan ◽  
Manickam Velan
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Water Electrolysis ◽  
Complexing Agent ◽  
Improved Method ◽  
Electrodeposition Technique ◽  
Alkaline Water Electrolysis ◽  
Improve Performance ◽  
Nickel Electrodes

<p class="PaperAbstract"><span lang="EN-US">The present work investigates the efficiency of an alkaline water electrolysis process in the presence of a complexing agent like citric acid (CA) when added directly into the electrolyte during the electrolytic process. High surface area nickel electrodes prepared by electrodeposition technique were used as the electrode to evaluate the efficiency of the oxygen evolution reaction (OER) by the polarization measurements and cyclic voltammetry. The quantity of the complexing agent CA in the electrolyte was varied from 0-1 wt. %. An increase in the current density of about 25% resulted at a temperature of 30 °C in the presence of 0.2 wt. % of CA at 1.0 V </span><span lang="EN-US">vs.</span><span lang="EN-US"> Hg/HgO. CA was found to improve performance by forming a complex with the alloy electrode and by formation of the high surface area catalyst for efficient OER.</span></p>

High Surface Area NanoCOT Catalysts on Ni Foam Framework for Efficient Water Electrolysis

2017 ◽  
Vol 77 (9) ◽  
pp. 61-70
Author(s):  
Elizabeth Dyer ◽  
Jeremy Hitt ◽  
Zhichao Shan ◽  
Shanlin Pan
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Water Electrolysis ◽  
Ni Foam

Development of Nano-Micro-Macro-Structured Porous Nickel Electrodes for use in Supercapacitors

2006 ◽  
Vol 973 ◽  
Author(s):  
Jason Manning ◽  
Roger Campbell ◽  
Renee Woo ◽  
Brenda O'Neil ◽  
Leigh McKenzie ◽  
...  
Keyword(s):  
Surface Area ◽  
Metal Ion ◽  
Nickel Foam ◽  
High Surface ◽  
High Surface Area ◽  
Porous Metal ◽  
Ion Concentration ◽  
Self Assembling ◽  
Starting Point ◽  
Nickel Electrodes

ABSTRACTThe extremely high surface areas required for supercapacitors has limited the use of metal based electrodes, despite the other advantages such electrodes might have. Self-assembling surfactants and block co-polymers can be used as templates to produce nanostructured thin films that readily give 60-140 fold increases in surface area on both planar and three-dimensional substrates. However, even when relatively high surface area porous metal substrates such as nickel foam are used as a starting point, the resultant material still has surface area density well short of that available in other types of materials. Micro-emulsions offer a method of generating microstructure that bridges the gap between the 100 micron scale structures of foamed metals and the 10-50 nm scale structure of self-assembling block co-polymers. Electrodeposition of nickel and cobalt from micro-emulsions of Tween surfactants gives rise to structure on the 0.1-10 micron length scale. The scale of the microstructure is strongly influenced by the metal ion concentration and the potential at which the electrodeposition. The nature of the metal ion also strongly effects the ease with which the microstructure can be generated and the distribution of the microstructured film on foamed nickel electrodes. For microstructured nickel films ten fold surface area increases can be achieved. The microstructured films are expected to be compatible with a number of the nanostructuring methods to yield cumulative surface area increases of 1000-2000 fold.

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.

Sign in / Sign up

Export Citation Format

Share Document