Zhang Huihui, Yang Dan, Ma Tianyi, Lin Han, Jia Baohua
Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia.
Small Methods. 2021 Jul;5(7):e2100225. doi: 10.1002/smtd.202100225. Epub 2021 Jun 18.
Production of high-capacitance electrodes beyond the theoretical limit of 550 F g of pure graphene materials is highly desired for energy storage applications, yet remains an open challenge, especially with a facile and simple process. By rational design of reaction condition guided by theoretical analysis, the ultrafast (within millisecond) fabrication of high-performance graphene/MnO electrodes via a low-cost and one-step flash reduction process is proposed and demonstrated. This simple method enables high-quality porous graphene networks and the effective synthesis of embedding pseudocapacitive-active MnO nanomaterials simultaneously. Due to the high-density and homogeneous distribution of MnO nano-needles on 3D graphene networks, an ultrahigh capacitance (up to 1706 F g based on electrode mass and 2150 F g based on MnO mass only) is demonstrated. Functional supercapacitor prototype further illustrates the broad potential applications enabled by the fabricated electrodes in energy storage, sensing, and catalysts.
对于储能应用而言，制备超出纯石墨烯材料理论极限550 F/g的高电容电极是非常有必要的，但这仍然是一个悬而未决的挑战，尤其是采用简便简单的工艺时。通过理论分析指导下的反应条件合理设计，提出并证明了通过低成本一步闪速还原法超快（在毫秒内）制备高性能石墨烯/MnO电极。这种简单的方法能够同时实现高质量多孔石墨烯网络和嵌入的赝电容活性MnO纳米材料的有效合成。由于MnO纳米针在三维石墨烯网络上的高密度和均匀分布，展示了超高电容（基于电极质量高达1706 F/g，仅基于MnO质量则为2150 F/g）。功能性超级电容器原型进一步说明了所制备电极在储能、传感和催化剂方面具有广泛的潜在应用。
