Nitrogen-Doped Graphene Aerogels as Efficient Supercapacitor Electrodes and Gas Adsorbents

Abstract

Nitrogen-doped graphene has been demonstrated to be an excellent multifunctional material due to its intriguing features such as outstanding electrocatalytic activity, high electrical conductivity, and good chemical stability as well as wettability. However, synthesizing the nitrogen-doped graphene with a high nitrogen content and large specific surface area is still a challenge. In this study, we prepared a nitrogen-doped graphene aerogel (NGA) with high porosity by means of a simple hydrothermal reaction, in which graphene oxide and ammonia are adopted as carbon and nitrogen source, respectively. The microstructure, morphology, porous properties, and chemical composition of NGA were well-disclosed by a variety of characterization methods, such as scanning electron microscopy, nitrogen adsorption-desorption measurements, X-ray photoelectron spectroscopy, and Raman spectroscopy. The as-made NGA displays a large Brunauer-Emmett-Teller specific surface area (830 m(2) g(-1)), high nitrogen content (8.4 atom %), and excellent electrical conductivity and wettability. On the basis of these features, the as-made NGA shows superior capacitive behavior (223 F g(-1) at 0.2 A g(-1)) and long-term cycling performance in 1.0 mol L(-1) H2SO4 electrolyte. Furthermore, the NGA also possesses a high carbon dioxide uptake capacity at 1.0 bar and 273 K (11.3 wt %).

Super-adsorbent material based on functional polymer particles with a multilevel porous structure

“…1 Owing to their superior physical and chemical features, including a large specific surface area, unique pore structure and tunable pore surface property, adsorbent materials have found utility in multiple applications, such as separation/purification, 2 as catalyst supports, 3 adsorption, 4 drug delivery, 5 gas separation/ storage, 6 electrode materials for electrochemical double layer capacitors and fuel cells 7,8 and so on.…”

A Roadmap for Achieving Sustainable Energy Conversion and Storage: Graphene-Based Composites Used Both as an Electrocatalyst for Oxygen Reduction Reactions and an Electrode Material for a Supercapacitor

“…This on the large scale hinders electrolyte transfer and ion accessibility, especially in ion liquids with a high viscosity. A potential solution to this aggregation is to synthesize graphene with porous or 3D structure [60]. EDL storage depends on the charge accumulation at electrode surface.…”

“…The NGA displayed excellent capacitance value (223 F/g at 0.2 A/g) and long-term cycling performance. The promising electrochemical performance can be attributed to the beneficial porous network, favorable electron transport, high nitrogen content and the uniform distribution of functional groups bonded covalently on the basal sheets of graphene [60].…”

Electromagnetic interference shielding properties and mechanisms of chemically reduced graphene aerogels

“…Graphene aerogels (GAs), firstly fabricated by Worsley [16], exhibited great performance in various applications, such as energy storage [17,18], supercapacitor electrode [19,20], gas sensor [21], etc. The applications greatly benefitted from the assembly of two-dimensional (2D) graphene sheets into three-dimensional (3D) porous structures and the intrinsic advantages shown by graphene itself, such as high electrical conductivity, large aspect ratio, and excellent mechanical properties [22][23][24][25][26].…”