A Simplified Microcontroller Based Potentiostat for Low-Resource Applications
A Simplified Microcontroller Based Potentiostat for Low-Resource Applications作者机构：Department of Materials Science and Engineering Obafemi Awolowo University Ile-Ife Nigeria Centre for Energy Research and Development Obafemi Awolowo University Ile-Ife Nigeria Department of Agricultural Engineering Obafemi Awolowo University Ile-Ife Nigeria
出 版 物：《Open Journal of Metal》 (金属学报（美国）)
年 卷 期：2015年第5卷第4期
页 面：37-46页
主 题：Potentiostat Voltammogram Microcontroller Randles-Sevcik Scan Rate
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.
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