Study on the behavior of single oxygen bubble regulated by salt concentration in photoelectrochemical water splitting

Wang, Mengsha; Nie, Tengfei; She, Yonglu; Tao, Leqing; Luo, Xinyi; Xu, Qiang; Guo, Liejin

doi:10.1016/j.ijhydene.2023.03.113

Cited by 15 publications

(7 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For ease of description, the diameter of the sphere in which the bubble is located, obtained by computer recognition in the captured photographs, is referred to as the bubble diameter d b , and the length of the contact line segment in which the bubble sphere is in contact with the electrode surface, obtained by observation from the camera direction, is referred to as the contact diameter d contact . The images are processed in the following way: ,,, selecting images at intervals among a large number of images; noise reduction processing of each image and binarization of the image to extract the boundaries of the bubble in the image; identifying d b and d contact , respectively, using the Hough transform and cropping, and calculating the contact angle θ contact of the bubble according to eq . Actually, at this time, d b and d contact obtained by the computer are still units of pixels.…”

Section: Methodsmentioning

confidence: 99%

“…8,15 Various measures have been taken to remove bubbles from the electrode surface. 6,7,16,17 In addition to selecting electrodes with better performance, most scholars choose to use reinforcement to enhance the mass transfer effect on the electrode surface, reduce bubble coverage, and improve reaction efficiency. 18,19 Currently, common methods of adding external perturbations include adding a supergravity field, ultrasonic field, magnetic field and vibration, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Various measures have been taken to remove bubbles from the electrode surface. ,,, In addition to selecting electrodes with better performance, most scholars choose to use reinforcement to enhance the mass transfer effect on the electrode surface, reduce bubble coverage, and improve reaction efficiency. , Currently, common methods of adding external perturbations include adding a supergravity field, ultrasonic field, magnetic field and vibration, etc. − Cho et al investigated the electrocatalytic decomposition of water under the influence of ultrasound. It was found that the ultrasonic field promoted bubble fragmentation as well as drift, resulting in a significant decrease in the size of the bubbles retained on the electrode and a significant increase in the current density.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study on Bubble Dynamics in Photoelectrochemical Water Splitting with Low-Rate Flow Fields

Ye,

Xu,

Nie

et al. 2023

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

In this study, we explored the effect of the flow rate on bubble dynamics in photoelectrochemical water splitting using a low-rate rotating flow field. With the flow rate increasing from 0 to 8.4 mm s −1 , the bubble life cycle and the bubble detachment diameter both decrease. However, the mass flow rate of the gas entering the bubble through the "direct injection" mode is not affected by the variation in the flow rate. Different from static conditions, increasing laser power in the flow field will cause the bubble life cycle to first increase and then decrease. In addition, the difference in the dissolved oxygen concentration between the reaction position and the bulk of the liquid phase can be reduced to at most about 1/10 of that under static conditions, which makes it easier for the bubbles to detach. Calculations show that the Marangoni force rather than the lift force remains the important factor affecting bubble departure in a low-rate flow field.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on Bubble Dynamics in Photoelectrochemical Water Splitting with Low-Rate Flow Fields

Ye,

Xu,

Nie

et al. 2023

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

show abstract

“…4b, it is concluded that the bubble detachment diameter and the bubble growth period also decrease. This indicates that when the electrolyte concentration increases, the solute Marangoni force on the bubble induced by the difference of the O 2 concentration between the photoanode reaction site area and the liquid bulk decreases continuously, 5,23 that is, the resistance of the bubble detachment is reduced, 55 so that the bubble detachment frequency and the bubble detachment diameter show a decreasing and accelerating trend, respectively. In short, the electrolyte concentration has a significant influence on the bubble detachment characteristics obtained by photoelectrochemical water splitting.…”

Section: Effect Of the Electrolyte Concentration On Bubble Evolution ...mentioning

confidence: 99%

Growth characteristics and the mass transfer mechanism of single bubble on a photoelectrode at different electrolyte concentrations

Wang,

Xu,

Nie

et al. 2023

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is essential to study the oxygen bubble behavior and evolution mechanism for improving the reaction efficiency . A large amount of work has been done on the impacts of electrode surface morphology, bubble coverage, light loss, and other studied reaction factors on the bubble behavior and reaction rate via in situ investigation of high-speed camera and signal acquisition techniques. – Qin et al compared the hydrogen bubble behaviors on the smooth, nanoporous, and nanoarray Pt electrode surfaces. They found that the time coefficient of bubble evolution decreased sequentially, and the smallest bubble detachment size appeared on the nanoarray electrode .…”

Section: Introductionmentioning

confidence: 99%

In Situ Investigation of Oxygen Bubble Evolution at Photoanode Surface Affected by Reaction Temperature

She

Nie

et al. 2023

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

A significant challenge associated with photoelectrochemical water splitting is the reduction of the anode photocurrent due to bubble adhesion. To achieve in situ observation of bubble evolution on the electrode surface, an electrochemistry system coupled with a high-speed camera was developed. The relations between photocurrent curves and bubble morphology were clarified on a fixed TiO 2 thin-film electrode at various reaction temperatures (303.15−343.15 K). The photocurrent during the nucleation waiting, growth, and detachment of bubble evolution increased approximately linearly with the reaction temperature, indicating a higher reaction rate and a reduction in the impedance that must be overcome during bubble growth. The shortened nucleation waiting period was illustrated via a homogeneous nucleation model. The study found that the required concentration of dissolved gas for bubble nucleation decreased with an increasing reaction temperature. The bubble oscillations (∼25 Hz) under high reaction temperatures promoted the bubble mass transfer from the perspective of gas evolution efficiency. Besides, a force balance model was established based on the experimental data of bubbles. Because of the decrease of solutal Marangoni force with the increase of reaction temperature, the bubble growth periods were shortened, along with the relatively large bubble detachment diameter, thereby efficiently accelerating bubble removal from the electrode surface.

show abstract

Study on the behavior of single oxygen bubble regulated by salt concentration in photoelectrochemical water splitting

Cited by 15 publications

References 75 publications

Study on Bubble Dynamics in Photoelectrochemical Water Splitting with Low-Rate Flow Fields

Study on Bubble Dynamics in Photoelectrochemical Water Splitting with Low-Rate Flow Fields

Growth characteristics and the mass transfer mechanism of single bubble on a photoelectrode at different electrolyte concentrations

In Situ Investigation of Oxygen Bubble Evolution at Photoanode Surface Affected by Reaction Temperature

Contact Info

Product

Resources

About