Promotion Centre for Global Materials Research (PCGMR), Department of Material Science and Engineering, National Cheng Kung University, Tainan, Taiwan.
Sci Rep. 2014 Feb 28;4:4237. doi: 10.1038/srep04237.
This study demonstrates a facile, mild and environmentally-friendly sustainable (soft processing) approach for the efficient electrochemical exfoliation of graphite using a sodium hydroxide/hydrogen peroxide/water (NaOH/H2O2/H2O) system that can produce high-quality, anodic few-layer graphene nanosheets in 95% yield at ambient reaction conditions. The control experiment conducted using NaOH/H2O revealed the crucial role of H2O2 in the exfoliation of graphite. A possible exfoliation mechanism is proposed. The reaction of H2O2 with hydroxyl ions (HO(-)) leads to the formation of highly nucleophilic peroxide ions (O2(2-)), which play a crucial role in the exfoliation of graphite via electrochemical-potential-assisted intercalation and strong expansion of graphite sheets.
本研究展示了一种简便、温和且环保的可持续（软处理）方法，可使用氢氧化钠/过氧化氢/水 (NaOH/H2O2/H2O) 系统高效地进行石墨的电化学剥离，在环境反应条件下以 95%的产率生成高质量的、阳极少层石墨烯纳米片。使用 NaOH/H2O 进行的对照实验揭示了 H2O2 在石墨剥离中的关键作用。提出了一种可能的剥离机制。H2O2 与氢氧根离子 (HO(-)) 的反应导致高亲核过氧离子 (O2(2-)) 的形成，其通过电化学势辅助插层和石墨层的强力膨胀在石墨的剥离中发挥关键作用。
