A Simplified Microcontroller Based Potentiostat for Low-Resource Applications

• 作者: Bolaji Aremo Imoh Bassey Obioh Mosobalaje Oyebamiji Adeoye Odunayo Adetola Adeboye
• 来源期刊: 金属学报(美国)
• 学科: 化学
• 关键词: POTENTIOSTAT VOLTAMMOGRAM MICROCONTROLLER Randles-Sevcik SCAN Rate
• 年，卷（期）: 2015,（4）
• 页码范围: 37-46
• 页数: 10页
• 分类号: O6

摘要

A low component count, microcontroller-based potentiostat circuit was developed through the use of operational amplifiers arranged in different feedback configurations. This was developed to alleviate the cost burden of equipment procurement in low-cost and budget applications. Simplicity was achieved in the design by the use of the microcontroller’s native functionalities and a low-cost R/2R resistor ladder digital-to-analogue converter. The potentiostat was used to investigate the Ni2+/Ni(s) redox couple in a 3-electrode cell with a silver/silver chloride reference electrode and graphite counter and working electrodes. Linear sweep voltammograms were ob-tained at scan rates of 10, 20, 30 and 40 mV/s. The analysis of the peak current versus (scan rate)1/2 plot indicated that the Ni2+/Ni(s) reduction, though conforming to the Randles-Sevcik equation, was a non-reversible redox reaction.a