Chang Sun-Tang, Jhong Huan-Ping, Chang Yu-Chung, Liu Chia-Chi, Chiang Tai-Chin, Huang Hsin-Chih, Wang Chen-Hao
Department of Materials Science and Engineering, National Taiwan University of Science and Technology Taipei 10607 Taiwan
Global Development Engineering Program, National Taiwan University of Science and Technology Taipei 10607 Taiwan
RSC Adv. 2020 Mar 20;10(20):11543-11550. doi: 10.1039/d0ra01078b. eCollection 2020 Mar 19.
In this study, biomimetic Mg-N -C from leaves were mixed with carbon black (L/C catalyst), in which the mixture was treated by a conventional microwave oven at 700 W and 2 min, exhibiting high catalytic activity for the oxygen reduction reaction (ORR). By using a microwave-assisted process, it not only offers a cheaper and faster way to synthesize the catalyst compared to the conventional furnace process but also avoids the decomposition of the N-structure. Using the optimized conditions, the L/C catalyst exhibits an electron transfer number of 3.90 and an HO yield of only 5% at 0.25 V RHE, which is close to the perfect four electron-transfer pathway. Besides, the L/C catalyst offers superior performance and long-term stability up to 20 000 s. The L/C catalyst contains a high proportion of quaternary-type nitrogen, Mg-N -C , and -C-S-C- which can be the active sites for the ORR.
在本研究中，将来自树叶的仿生Mg-N-C与炭黑混合（L/C催化剂），其中该混合物在传统微波炉中以700W功率处理2分钟，对氧还原反应（ORR）表现出高催化活性。通过微波辅助工艺，与传统炉法相比，它不仅提供了一种更便宜、更快的催化剂合成方法，还避免了N结构的分解。在优化条件下，L/C催化剂在0.25V（相对于可逆氢电极）时的电子转移数为3.90，HO产率仅为5%，接近完美的四电子转移途径。此外，L/C催化剂具有优异的性能和长达20000秒的长期稳定性。L/C催化剂含有高比例的季氮型、Mg-N-C和-C-S-C-，它们可能是ORR的活性位点。
