Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK.
Centre of Excellence for Energy Storage Technology (CEST), Department of Chemical and Biomolecular Engineering, Vidyasirimedhi Institute of Science and Technology, School of Energy Science and Engineering, Rayong 21210, Thailand.
Sensors (Basel). 2023 Jan 25;23(3):1360. doi: 10.3390/s23031360.
Zero-emission hydrogen and oxygen production are critical for the UK to reach net-zero greenhouse gasses by 2050. Electrochemical techniques such as water splitting (electrolysis) coupled with renewables energy can provide a unique approach to achieving zero emissions. Many studies exploring electrocatalysts need to "electrically wire" to their material to measure their performance, which usually involves immobilization upon a solid electrode. We demonstrate that significant differences in the calculated onset potential for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) can be observed when using screen-printed electrodes (SPEs) of differing connection lengths which are immobilized with a range of electrocatalysts. This can lead to false improvements in the reported performance of different electrocatalysts and poor comparisons between the literature. Through the use of electrochemical impedance spectroscopy, uncompensated ohmic resistance can be overcome providing more accurate Tafel analysis.
零排放的氢气和氧气生产对于英国到 2050 年实现温室气体净零排放至关重要。水分解（电解）与可再生能源相结合的电化学技术可以为实现零排放提供独特的方法。许多探索电催化剂的研究需要“电连接”到它们的材料来测量它们的性能，这通常涉及到固定在固体电极上。我们证明，当使用具有不同连接长度的丝网印刷电极（SPE）固定一系列电催化剂时，可以观察到氢析出反应（HER）和氧析出反应（OER）的计算起始电位的显著差异。这可能导致不同电催化剂的报告性能出现错误的改善，以及文献之间的比较不佳。通过使用电化学阻抗谱，可以克服未补偿的欧姆电阻，提供更准确的塔菲尔分析。
