Nano-V2O5/Ti porous membrane electrode with enhanced electrochemical activity for the high-efficiency oxidation of cyclohexane

2018 ◽  
Vol 20 (17) ◽  
pp. 3944-3953 ◽  
Author(s):  
Yujun Zhang ◽  
Yubo Qi ◽  
Zhen Yin ◽  
Hong Wang ◽  
Benqiao He ◽  
...  
Keyword(s):  
High Efficiency ◽  
Porous Membrane ◽  
Electrochemical Activity ◽  
Membrane Electrode

In ECMR, V2O5 nanocatalysts with different morphologies were loaded onto a Ti membrane, demonstrating superior activity toward CHA oxidation.

Determination of subnanogram amounts of sulfur dioxide and sulfites by pneumatopotentiometry

1986 ◽  
Vol 51 (10) ◽  
pp. 2077-2082 ◽  
Author(s):  
Jan Langmaier ◽  
František Opekar
Keyword(s):  
Sulfur Dioxide ◽  
Redox Potential ◽  
Sodium Hydroxide ◽  
Porous Membrane ◽  
Membrane Electrode ◽  
Iodine Monochloride ◽  
Membrane Pores ◽  
Relative Standard ◽  
Limit Of Quantitation

Gold porous membrane electrode has been used for the potentiometric determination of small amounts of sulfur dioxide absorbed in the solutions of sodium tetrachloromercurate or sodium hydroxide. Sulfur dioxide is released by the reaction with an acid into a stream of nitrogen and led to the electrode immersed into the solution of iodine monochloride. Part of SO2 penetrates through the membrane pores into the solution where it is oxidized. The electrode redox potential change is a measure of the SO2 concentration in the absorption solution. In the solution of 1 . 10-5 M[ICl2]- in 0.02 M-HClO4 the limit of quantitation was found to be 0.07 ng SO2 . ml-1. The relative standard deviations of 1.4% and 2.5% were found for the determinations of 10 ng and 0.5 ng of SO2, respectively. Higher concentrations of H2S interfere only in the hydroxide solution. About 10 samples can be analyzed per one hour.

An ultrathin suspended hydrophobic porous membrane for high-efficiency water desalination

2017 ◽  
Vol 9 ◽  
pp. 1-9 ◽  
Author(s):  
M.L. Perrotta ◽  
G. Saielli ◽  
G. Casella ◽  
F. Macedonio ◽  
L. Giorno ◽  
...  
Keyword(s):  
High Efficiency ◽  
Porous Membrane ◽  
Water Desalination

Morphology/phase-dependent MoS2 nanostructures for high-efficiency electrochemical activity

2020 ◽  
Vol 818 ◽  
pp. 152909 ◽  
Author(s):  
Liang Zhou ◽  
Tianyu Xia ◽  
Tianqi Cao ◽  
Lingrui Wang ◽  
Yongsheng Chen ◽  
...  
Keyword(s):  
High Efficiency ◽  
Electrochemical Activity

A gradient hexagonal-prisms Fe3Se4@SiO2@C configuration as a highly reversible sodium conversion anode

2022 ◽  
Author(s):  
Wenxi Zhao ◽  
Xiaoqing Ma ◽  
Luchao Yue ◽  
Longcheng Zhang ◽  
Yongsong Luo ◽  
...  
Keyword(s):  
High Efficiency ◽  
Electrochemical Activity ◽  
Intrinsic Conductivity ◽  
Physicochemical Features ◽  
Metal Selenides ◽  
Sodium Storage

Metal selenides have attracted great concern for high-efficiency sodium storage thanks to the remarkable advantages of physicochemical features and electrochemical activity. However, the enormous issues (e.g. poor intrinsic conductivity, severe...

scholarly journals KOH-doped Porous Polybenzimidazole Membranes for Solid Alkaline Fuel Cells

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 525
Author(s):  
Jong-Hyeok Park ◽  
Jin-Soo Park
Keyword(s):  
Fuel Cells ◽  
Potassium Hydroxide ◽  
Peak Power ◽  
Dibutyl Phthalate ◽  
Membrane Electrode Assembly ◽  
Porous Membrane ◽  
Skin Layer ◽  
Membrane Electrode ◽  
Alkaline Fuel Cells ◽  
Dense Membrane

In this study the preparation and properties of potassium hydroxide-doped meta-polybenzimidazole membranes with 20–30 μm thickness are reported as anion conducting polymer electrolyte for application in fuel cells. Dibutyl phthalate as porogen forms an asymmetrically porous structure of membranes along thickness direction. One side of the membranes has a dense skin layer surface with 1.5–15 μm and the other side of the membranes has a porous one. It demonstrated that ion conductivity of the potassium hydroxide-doped porous membrane with the porogen content of 47 wt.% (0.090 S cm−1), is 1.4 times higher than the potassium hydroxide-doped dense membrane (0.065 S cm−1). This is because the porous membrane allows 1.4 times higher potassium hydroxide uptake than dense membranes. Tensile strength and elongation studies confirm that doping by simply immersing membranes in potassium hydroxide solutions was sufficient to fill in the inner pores. The membrane-electrode assembly using the asymmetrically porous membrane with 1.4 times higher ionic conductivity than the dense non-doped polybenzimidazole (mPBI) membrane showed 1.25 times higher peak power density.

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.

Enclosure/Open Cathode Fuel Cell Mathematical Model for Analyzing System Performance Under Arctic Conditions

2012 ◽  
Author(s):  
Samantha M. Miller ◽  
Marc Secanell
Keyword(s):  
Mathematical Model ◽  
Fuel Cell ◽  
Energy Transport ◽  
High Efficiency ◽  
Coupled System ◽  
Membrane Electrode Assembly ◽  
Operating Conditions ◽  
Membrane Electrode ◽  
Power Sources ◽  
Fuel Cell Stack

Polymer electrolyte fuel cells (PEFC) provide the option of a remote power source with high efficiency and minimal green-house gases, NOx, SOx and particulate matter. To protect the PEFC stack from the environment in which remote power sources are required, an actively controlled enclosure to provide optimal temperature and relative humidity to the open-air cathode PEFC stack is studied. A mathematical model of a transient, non-isothermal, lumped parameter, open-cathode fuel cell stack is developed and coupled with an enclosure model. The open-cathode fuel cell stack mathematical model includes characterization of the cathode channel, the anode channel and the membrane electrode assembly (MEA). The transient mass and energy transport equations for the coupled system are solved to determine the optimal operating conditions for the PEFC stack within the enclosure.

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