Evolution of Electrolytic Hydrogen Bubbles on Microstructured Electrodes

2017 ◽  
Keyword(s):  
Hydrogen Bubbles ◽  
Electrolytic Hydrogen

scholarly journals Revisiting Gas to Solids Ratio for Activated Sludge Clarification by Electrolytic Hydrogen Bubbles: Theoretical and Experimental Evaluations

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1413
Author(s):  
Jiseon Kim ◽  
Chong Min Chung ◽  
Kangwoo Cho ◽  
Tai Hak Chung
Keyword(s):  
Activated Sludge ◽  
Water Electrolysis ◽  
Green Energy ◽  
Governing Parameter ◽  
Hydraulic Loading ◽  
Micro Particles ◽  
Hydrogen Bubbles ◽  
Electrolytic Hydrogen ◽  
Practical Guidelines ◽  
The Given

Molecular hydrogen (H2), as the green energy carrier from water electrolysis, can be utilized for separation of suspended micro-particles as electroflotation (EF). This study provides practical guidelines for the gas to solids (G/S) ratio as the governing parameter in EF, based on theoretical estimations and experiments for clarification of activated sludge. The G/S ratio in EF was controlled linearly by current density (j), under quasi-consistent current efficiency (at j > 8 mA/cm2) for H2 (~1) and O2 (~0.4) bubble generations on Ti cathode and IrTaOx anode, respectively. Based on the measured sizes of bubbles (approximated to 35 µm) and biological flocs (discretized to mean sizes of 22.5, 40, 60, 135, and 150 µm), batch flotation experiments estimated the maximum collision-attachment efficiency of 0.057. The rise velocities of floc-bubble aggregate were computed to derive the limiting G/S ratio to overcome the given influent hydraulic loading. Consequently, the estimates (5.23 × 10−4 and 5.92 × 10−4 at hydraulic loading of 0.87 and 1.73 cm/min, respectively) were compatible with the continuous EF experiments.

Growth and detachment of single hydrogen bubbles in a magnetohydrodynamic shear flow

2017 ◽  
Vol 2 (9) ◽  
Author(s):  
Dominik Baczyzmalski ◽  
Franziska Karnbach ◽  
Gerd Mutschke ◽  
Xuegeng Yang ◽  
Kerstin Eckert ◽  
...  
Keyword(s):  
Shear Flow ◽  
Hydrogen Bubbles

scholarly journals The effect of magnetic field on the dynamics of gas bubbles in water electrolysis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yan-Hom Li ◽  
Yen-Ju Chen
Keyword(s):  
Magnetic Field ◽  
Swirling Flow ◽  
Gas Bubbles ◽  
Water Electrolysis ◽  
Platinum Electrodes ◽  
Optimal Layout ◽  
Parallel Magnetic Field ◽  
Hydrogen Bubbles ◽  
The Magnetic Field ◽  
Sluggish Flow

AbstractThis study determines the effect of the configuration of the magnetic field on the movement of gas bubbles that evolve from platinum electrodes. Oxygen and hydrogen bubbles respectively evolve from the surface of the anode and cathode and behave differently in the presence of a magnetic field due to their paramagnetic and diamagnetic characteristics. A magnetic field perpendicular to the surface of the horizontal electrode causes the bubbles to revolve. Oxygen and hydrogen bubbles revolve in opposite directions to create a swirling flow and spread the bubbles between the electrodes, which increases conductivity and the effectiveness of electrolysis. For vertical electrodes under the influence of a parallel magnetic field, a horizontal Lorentz force effectively detaches the bubbles and increases the conductivity and the effectiveness of electrolysis. However, if the layout of the electrodes and magnetic field results in upward or downward Lorentz forces that counter the buoyancy force, a sluggish flow in the duct inhibits the movement of the bubbles and decreases the conductivity and the charging performance. The results in this study determine the optimal layout for an electrode and a magnetic field to increase the conductivity and the effectiveness of water electrolysis, which is applicable to various fields including energy conversion, biotechnology, and magnetohydrodynamic thruster used in seawater.

Status of advanced electrolytic hydrogen production in the United States and abroad☆

1984 ◽  
Vol 9 (4) ◽  
pp. 269-275 ◽  
Author(s):  
M BONNER ◽  
T BOTTS ◽  
J MCBREEN ◽  
A MEZZINA ◽  
F SALZANO ◽  
...  
Keyword(s):  
United States ◽  
Hydrogen Production ◽  
The United States ◽  
Electrolytic Hydrogen

Model for hydrogen bubbles and connection to roughness of etched surfaces

2008 ◽  
Vol 129 (15) ◽  
pp. 156101 ◽  
Author(s):  
Teemu Hynninen ◽  
Miguel A. Gosálvez
Keyword(s):  
Hydrogen Bubbles

An electrolytic-hydrogen-fed moving bed biofilm reactor for efficient microbial electrosynthesis of methane from CO2

2022 ◽  
Vol 428 ◽  
pp. 132093
Author(s):  
Wenfang Cai ◽  
Kai Cui ◽  
Zhuangzhuang Liu ◽  
Xiaodan Jin ◽  
Qingyun Chen ◽  
...  
Keyword(s):  
Biofilm Reactor ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Microbial Electrosynthesis ◽  
Electrolytic Hydrogen
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