Interplay of the Open Circuit Potential-Relaxation and the Dissolution Behavior of a Single H2 Bubble Generated at a Pt Microelectrode
Interplay of the Open Circuit Potential-Relaxation and the Dissolution Behavior of a Single H2 Bubble Generated at a Pt Microelectrode
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Pt 微电极产生的单个 H2 气泡的开路电位弛豫与溶解行为的相互作用
DOI：
10.1021/acs.jpcc.6b02305
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发表时间：
2016
影响因子：
3.7
通讯作者：
M. Uhlemann
中科院分区：
文献类型：
--
作者：
F. Karnbach;X. Yang;G. Mutschke;J. Froehlich;J. Eckert;A. Gebert;K. Tschulik;K. Eckert;M. Uhlemann
研究了在Pt微电极上电化学产生的单个H2气泡在1 M H2SO 4中的溶解行为。记录极化结束后的开路电位（OCP）弛豫，并与电极/电解质/气体界面处的溶解H2浓度进行关联。同时，通过高速照相机光学跟踪气泡的收缩。此外，分析建模和数值模拟的气泡溶解。在OCP和气泡半径瞬变中确定了三个特征区域：（i）缓慢松弛和收缩，（ii）过渡区域，以及（iii）长期减缓的溶解过程。极化后的高过饱和度保持的时间比理论预测的长，并在区域（i）中供给气泡。这降低了气泡的溶解速率，这与非电化学产生的气泡的溶解速率显著不同。数值多物种模拟证明，溶解在电解质中的氧和氮另外影响气泡溶解和减缓其收缩相比，纯氢扩散。在区域（iii）中，氢气与氮气和氧气的完全交换已经在气泡中发生。
The dissolution behavior of a single H2bubble electrochemically generated at a Pt microelectrode in 1 M H2SO4was studied. The open circuit potential (OCP) relaxation after the polarization end was recorded and correlated with the dissolved H2concentration at the interface electrode/electrolyte/gas. Simultaneously, the shrinking of the bubble was followed optically by means of a high speed camera. In addition, analytical modeling and numerical simulations for the bubble dissolution were performed. Three characteristic regions are identified in the OCP and the bubble radius transients: (i) slow relaxation and shrinking, (ii) transition region, and (iii) a long-term slowed down dissolution process. The high supersaturation after polarization remains longer than theoretically predicted and feeds the bubble in region (i). This reduces the dissolution rate of the bubble which differs significantly from that of nonelectrochemically produced bubbles. Numerical multispecies simulations prove that oxygen and nitrogen dissolved in the electrolyte additionally influence the bubble dissolution and slow down its shrinkage compared to pure hydrogen diffusion. In region (iii), a complete exchange of hydrogen gas with nitrogen and oxygen has occurred in the gas bubble.
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DOI：
10.1088/0953-8984/25/18/184008
发表时间：
2013-04
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
作者：
S. Nakabayashi;R. Shinozaki;Y. Senda;H. Yoshikawa
通讯作者：
S. Nakabayashi;R. Shinozaki;Y. Senda;H. Yoshikawa
铂电极上氢的欠电位沉积的能量学 I. 不存在共吸附物质
影响因子：
3.9
作者：
A. Zolfaghari;M. Chayer;G. Jerkiewicz
通讯作者：
G. Jerkiewicz
影响因子：
3.2
作者：
LIEBERMANN, L
通讯作者：
LIEBERMANN, L
暴露于小尺度磁场梯度的电极处磁性物质传质的数值模拟
影响因子：
0.7
作者：
G. Mutschke;K. Tschulik;M. Uhlemann;J. Fröhlich
通讯作者：
J. Fröhlich
DOI：
10.1021/acs.langmuir.5b01825
发表时间：
2015-07
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
Xuegeng Yang;Franziska Karnbach;M. Uhlemann;S. Odenbach;K. Eckert
通讯作者：
Xuegeng Yang;Franziska Karnbach;M. Uhlemann;S. Odenbach;K. Eckert