Department of Chemistry, Rice University, 6100 Main Street, Houston, TX, 77005, USA.
Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA.
Adv Mater. 2018 May;30(21):e1707319. doi: 10.1002/adma.201707319. Epub 2018 Apr 2.
An efficient metal-free catalyst is presented for oxygen evolution and reduction based on oxidized laser-induced graphene (LIG-O). The oxidation of LIG by O plasma to form LIG-O boosts its performance in the oxygen evolution reaction (OER), exhibiting a low onset potential of 260 mV with a low Tafel slope of 49 mV dec , as well as an increased activity for the oxygen reduction reaction. Additionally, LIG-O shows unexpectedly high activity in catalyzing Li O decomposition in Li-O batteries. The overpotential upon charging is decreased from 1.01 V in LIG to 0.63 V in LIG-O. The oxygen-containing groups make essential contributions, not only by providing the active sites, but also by facilitating the adsorption of OER intermediates and lowering the activation energy.
本文提出了一种基于氧化激光诱导石墨烯（LIG-O）的高效无金属催化剂，用于氧的析出和还原。通过 O 等离子体对 LIG 的氧化，形成 LIG-O，从而提高其在析氧反应（OER）中的性能，表现出低的起始电位 260 mV 和低的 Tafel 斜率 49 mV dec ，以及对氧还原反应的增强活性。此外，LIG-O 在催化 Li-O 电池中 LiO 分解方面表现出出人意料的高活性。充电时的过电势从 LIG 的 1.01 V 降低到 LIG-O 的 0.63 V。含氧基团不仅通过提供活性位点，而且通过促进 OER 中间体的吸附和降低活化能，做出了重要贡献。
