Observation of Oxygen Bubble Growth near Anode Catalyst Electrode in PEM Water Electrolyzer

Nanorod-array structure gains its popularity in photoelectrode design for water splitting. However, the structure’s effects on solid-liquid interface interaction and reaction product transportation still remain unsolved. Gas bubble generally evolved from photoelectrodes, which provides a starting point for the problem-solving. Based on this, investigations on the gas-evolving photoelectrode are carried out in this paper. By experimental studies of wettability on the photoelectrode nanorod-array surface and oxygen bubble growth from anode, we analyzed the interaction affecting the gas-solid-liquid contact behaviors and product transportation mechanism, which is controlled by diffusion due to the concentration gradient of dissolved gases in the aqueous electrolyte and the microconvection caused by the bubble interface movement. In the end, based on the bubble growth characteristics ofRB(t)~t0.5in the experiment, a model describing the product transport mechanism was presented.

Download Full-text

Self-assembled RuO2@IrOx core-shell nanocomposite as high efficient anode catalyst for PEM water electrolyzer

Applied Surface Science ◽

10.1016/j.apsusc.2020.145943 ◽

2020 ◽

Vol 514 ◽

pp. 145943 ◽

Cited By ~ 4

Author(s):

Hong Lv ◽

Sen Wang ◽

Jiakun Li ◽

Changfeng Shao ◽

Wei Zhou ◽

...

Keyword(s):

Core Shell ◽

Anode Catalyst ◽

High Efficient ◽

Self Assembled ◽

Pem Water Electrolyzer

Download Full-text

Using Pore Former to Improve Performance of Anode Catalyst Layer of a PEM Water Electrolyzer

ECS Meeting Abstracts ◽

10.1149/ma2020-02382453mtgabs ◽

2020 ◽

Vol MA2020-02 (38) ◽

pp. 2453-2453

Author(s):

Manas Mandal ◽

Marc Secanell

Keyword(s):

Catalyst Layer ◽

Anode Catalyst ◽

Improve Performance ◽

Pore Former ◽

Pem Water Electrolyzer

Download Full-text

Direct observations of radiation-enhanced transformations in glass

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100075543 ◽

1983 ◽

Vol 41 ◽

pp. 354-355

Author(s):

J. F. DeNatale ◽

D. G. Howitt

Keyword(s):

Glass Matrix ◽

Diffusion Mechanism ◽

Bubble Formation ◽

Silicate Glasses ◽

Phase Decomposition ◽

Direct Observations ◽

Thin Foils ◽

Oxygen Bubble ◽

Electron Energy Loss ◽

Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

Download Full-text