Kim Jeheon, Zhou Ruifeng, Murakoshi Kei, Yasuda Satoshi
Department of Chemistry, Faculty of Science, Hokkaido University Sapporo 060-0810 Japan
Institute for International Collaboration, Hokkaido Univ. Sapporo 060-0815 Japan.
RSC Adv. 2018 Apr 17;8(26):14152-14156. doi: 10.1039/c8ra01636d.
Metal-free carbonaceous catalysts have potential applications for oxygen evolution reaction (OER) devices because of their low-cost and abundant supply. We report that fluorine-doped carbon black is an active catalyst for OER. Fluorine-doped carbon black (F-KB) is simply synthesized by the pyrolysis of KETJENBLACK (KB) as carbon substrate with Nafion as fluorine precursor. As a result, the OER activity of F-KB is significantly higher than that of pristine KB in alkaline media. The OER catalytic activity of F-KB is found to be dependent on the quantity and characteristics of carbon-fluorine bonding (C-F) which can be controlled by the pyrolysis temperature. It is further found that the OER activity depends on the quantity of semi-ionic C-F bonds, but not covalent C-F bonds. This result proves the importance of carbon atoms with semi-ionic C-F bonds as the active sites for OER.
无金属碳质催化剂因其低成本和丰富的供应而在析氧反应（OER）装置中具有潜在应用。我们报道氟掺杂炭黑是一种用于OER的活性催化剂。氟掺杂炭黑（F-KB）通过以科琴黑（KB）作为碳基底，以全氟磺酸离子交换膜（Nafion）作为氟前驱体进行热解简单合成。结果，在碱性介质中F-KB的OER活性显著高于原始KB。发现F-KB的OER催化活性取决于碳氟键（C-F）的数量和特性，其可通过热解温度来控制。进一步发现OER活性取决于半离子C-F键的数量，而非共价C-F键的数量。该结果证明了具有半离子C-F键的碳原子作为OER活性位点的重要性。
