(中南大學(xué) 冶金科學(xué)與工程學(xué)院, 長(zhǎng)沙 410083)
摘 要: 結(jié)合恒電流階躍和信號(hào)處理技術(shù)， 用統(tǒng)計(jì)直方圖和快速傅里葉變換（FFT）對(duì)電解槽中電解氣泡產(chǎn)生時(shí)電極電位的波動(dòng)信號(hào)進(jìn)行了統(tǒng)計(jì)和頻譜分析。 采用MatLab語言及其提供的信號(hào)處理工具箱構(gòu)造算法， 獲得電位波動(dòng)在頻域上的波形信號(hào)， 通過計(jì)算功率譜密度PSD隨頻率的變化， 分析了電解氣泡行為特性， 獲得平均氣泡脫離速率、 氣泡脫離的平均直徑以及平均氣泡體積等特性參數(shù)。 研究結(jié)果表明：用電位波動(dòng)的直方圖和FFT頻譜分析可以獲得有關(guān)電極表面氣泡釋放行為的信息， 如氣泡脫離時(shí)電位波動(dòng)的平均幅值、平均氣泡脫離速率、 氣泡脫離的平均直徑以及電解氣泡平均體積等特性參數(shù)， 以用于分析研究電解過程電極界面的氣泡行為。
關(guān)鍵字: 電解氣泡； 電位波動(dòng)； 頻譜分析； FFT； MatLab
（College of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China）
Abstract:The potential fluctuations observed under current control during gas evolution were analyzed by statistic histogram and FFT spectral analysis. Potential fluctuation signals were processed by means of program coded with MatLab and its signal processing toolbox. Calculated power spectral densities (PSDs) were used to analyze bubble behaviors occurring at a platinum disk microelectrode of 100um and 1 mm in diameter during galvanostatic polarization. Some characteristic parameters of the gas evolution, such as the average number of detached bubbles per time unit, the average radius of detached bubble and the mean volume of bubble, were derived from measured PSD of potential fluctuation. The results show that useful information related to bubble behaviors on interface of electrode/electrolyte can be obtained by histogram and FFT spectral analysis, which can be applied to investigate the electrolytic bubble occurring within electrochemical reactor.
Key words: electrolytic bubble; potential fluctuation; spectral analysis; FFT; MatLab
