文章信息/Info

Title:

Preparation of Nitrogen-Doped Graphene Hydrogel Film and the Electrocatalytic Activity for Oxygen Reduction Reaction

作者:

陶婧穎; 胡飛; 王戈; 符冬菊; 楊曉偉              

同濟大學(xué)材料科學(xué)與工程學(xué)院，. 深圳清華大學(xué)研究院

Author(s):

Jingying Tao;  Fei Hu;  Ge Wang;  Dongju Fu;  Yang Xiaowei              

School of Materials Science and Engineering, Tongji University, Research Institute of Tsinghua University in Shenzhen

關(guān)鍵詞:

石墨烯; 氮摻雜; 氧還原; 水凝膠薄膜; 水熱法

DOI:

10.7502/j.issn.1674-3962.2016.12.02

文獻標志碼:

A

摘要:

以氧化石墨烯分散液為前軀體、尿素為主要氮源，經(jīng)水熱還原和真空抽濾后制得不同氧還原催化活性的氮摻雜石墨烯水凝膠薄膜。采用掃描電子顯微鏡、X射線光電子能譜儀、激光拉曼光譜儀、循環(huán)伏安等手段對材料的形貌、結(jié)構(gòu)和氧還原電催化性能進行表征。結(jié)果顯示：制得的氮摻雜石墨烯水凝膠薄膜的含氮量在2.37-4.22%之間，其中氮元素主要以吡啶型和吡咯型形式存在。當(dāng)?shù)�含量�?.22%時，氮摻雜石墨烯水凝膠薄膜具有最小的氧還原起始電位，約為0.15V，以及最大的極限電流密度，達2.75mA/cm2，顯示出較好的氧還原催化性能。

Abstract:

Nitrogen-doped graphene (NG) hydrogel film was prepared by hydrothermal reduction and then vacuum filtration methods using graphene oxide dispersion as precursor and urea as the main doping agent. The nitrogen-doped graphene with various oxygen reduction reaction activities can be obtained through tuning the urea addition. The morphologies, structures and elelctrocatalytic activities of the as-prepared materials were investigated using Scanning Electron Microscope, X-Ray Photoelectron Spectroscopy, Laser Raman Spectrometer and Cyclic Voltammetry methods. The results showed that the nitrogen-doped graphene hydrogel films have nitrogen contents varying from 2.37% to 4.22%, dominant with pyridinic N and pyrrolic N. The electrochemical tests showed, the ORR onset potential reaches the minimum of 0.15 V when the nitrogen content is 4.22%, with the limiting current density of about 2.75mA/cm2, which shows good ORR catalytic performance.