Barekati Neda Sadat, Farsi Hossein, Farrokhi Alireza, Moghiminia Shokufeh
Department of Chemistry, University of Birjand, Birjand, Iran.
DNEP Research Lab, University of Birjand, Birjand, Iran.
Heliyon. 2024 Feb 10;10(4):e26281. doi: 10.1016/j.heliyon.2024.e26281. eCollection 2024 Feb 29.
Electrocatalytic CO reduction, as an effective way to reduce the CO concentration, has gained attention. In this study, we prepared ZIF-67 nanoparticles and nanosheets and investigated them as electrocatalysts for CO reduction. It was found that ZIF-67 nanosheets, because of their two-dimensional morphologies, provide more under-coordinated cobalt nodes and have lower overpotentials for both hydrogen evolution and CO reduction reactions. Also, the rate-determining step for hydrogen evolution changes from Volmer for ZIF-67 nanoparticles to Hyrovsky for ZIF-67 nanosheets. Also, the presence of Mg ions in solution causes more facile CO reduction, especially for ZIF-67 nanosheets.
作为降低一氧化碳浓度的有效方法，电催化一氧化碳还原已受到关注。在本研究中，我们制备了ZIF-67纳米颗粒和纳米片，并将它们作为一氧化碳还原的电催化剂进行了研究。结果发现，ZIF-67纳米片由于其二维形态，提供了更多配位不足的钴节点，并且在析氢和一氧化碳还原反应中具有更低的过电位。此外，析氢的速率决定步骤从ZIF-67纳米颗粒的Volmer反应变为ZIF-67纳米片的Heyrovsky反应。而且，溶液中镁离子的存在使一氧化碳还原更容易进行，特别是对于ZIF-67纳米片。
