论文标题
激光辅助溶液合成高性能石墨烯支持的电催化剂
Laser Assisted Solution Synthesis of High Performance Graphene Supported Electrocatalysts
论文作者
论文摘要
需要简单但多才多艺的方法，可以用金属（氧化物）纳米颗粒功能化石墨烯片，尤其是对于晚期催化剂的开发。在此基于光诱导的电化学基于激光辅助，连续的溶液途径，以同时还原和修饰氧化石墨烯与催化纳米颗粒。电化学石墨烯氧化物（EGO）由于其低氧化程度而用作起始材料和电子孔对源，从而赋予结构完整性和承受光降解的能力。只需用248 nm波长激光器照亮含有自我和金属盐（例如H2PTCL6或RUCL3）的溶液流就会产生降低的自我（Rego，氧含量4.0 at％）片，并用Pt（〜2.0 nm）或RUO2（〜2.8 nm）纳米颗粒装饰。 RUO2-Rego薄片表现出对氧气进化反应的优质催化活性，需要小势为225 mV才能达到10 mA CM-2的电流密度。与20 wt％PT/C催化剂相比，PT-Rego薄片（PT的10.2 wt％）显示出氢进化反应的质量活性增强，氧还原反应的性能相似。这种简单的生产方法还用于将PTPD合金和MNOX纳米颗粒沉积在Rego上，证明其在合成功能性纳米粒子修饰的石墨烯材料中的多功能性。
Simple, yet versatile, methods to functionalize graphene flakes with metal (oxide) nanoparticles are in demand, particularly for the development of advanced catalysts. Herein, based on light-induced electrochemistry, a laser-assisted, continuous, solution route for the simultaneous reduction and modification of graphene oxide with catalytic nanoparticles is reported. Electrochemical graphene oxide (EGO) is used as starting material and electron-hole pair source due to its low degree of oxidation, which imparts structural integrity and an ability to withstand photodegradation. Simply illuminating a solution stream containing EGO and metal salt (e.g., H2PtCl6 or RuCl3) with a 248 nm wavelength laser produces reduced EGO (rEGO, oxygen content 4.0 at%) flakes, decorated with Pt (~2.0 nm) or RuO2 (~2.8 nm) nanoparticles. The RuO2-rEGO flakes exhibit superior catalytic activity for the oxygen evolution reaction, requiring a small overpotential of 225 mV to reach a current density of 10 mA cm-2. The Pt-rEGO flakes (10.2 wt% of Pt) show enhanced mass activity for the hydrogen evolution reaction, and similar performance for oxygen reduction reaction compared to a commercial 20 wt% Pt/C catalyst. This simple production method is also used to deposit PtPd alloy and MnOx nanoparticles on rEGO, demonstrating its versatility in synthesizing functional nanoparticle-modified graphene materials.
