论文标题
在新型3电极流通电池中的多孔镍电极处的气泡尺寸分布和电极覆盖率
Bubble size distribution and electrode coverage at porous nickel electrodes in a novel 3-electrode flow-through cell
论文作者
论文摘要
引入了一种新型的3电极细胞类型，以在多孔电极上的碱性电解质中进行H $ _2 $进化的参数研究。与高速光学测量系统结合使用的电化学方法同时应用了电极和气泡动力学以气泡尺寸分布和工作电极的覆盖范围来表征。在| J |的应用电流密度下研究了三种由扩展镍制成的不同阴极。 = 10至200 mA cm $^{ - 2} $没有强制流，流速为5 ml min $^{ - 1} $。发现所施加的电流密度显着影响分离的气泡的尺寸和工作电极的表面覆盖率。发现穿过阴极的强制流可将气泡尺寸强烈降低至当前密度约为100 mA cm $^{ - 2} $，而直到阴极表面完全被气泡完全覆盖的初始瞬态只会受气泡的影响。
A novel 3-electrode cell type is introduced to run parametrical studies of H$_2$ evolution in an alkaline electrolyte on porous electrodes. Electrochemical methods combined with a high-speed optical measurement system are applied simultaneously to characterize the electrodes and the bubble dynamics in terms of bubble size distribution and coverage of the working electrode. Three different cathodes made of expanded nickel are investigated at applied current densities of |j| = 10 to 200 mA cm$^{-2}$ without forced flow and at a flow rate of 5 ml min$^{-1}$. The applied current density is found to significantly influence both the size of detached bubbles and the surface coverage of the working electrode. The forced flow through the cathodes is found to strongly reduce the bubble size up to current densities of about 100 mA cm$^{-2}$, whereas the initial transient until the cathode surface is completely covered by bubbles is only marginally affected by the flow-through.
