研究目的
Investigating the synthesis of graphene nanoribbon-graphene quantum dot (GNR-GQD) hybrids and their application in composite electrolyte membranes for direct methanol fuel cells (DMFCs) to enhance performance and durability.
研究成果
The sGNR-sGQD nanohybrids significantly enhance the performance and durability of sPEEK-based membranes in DMFC applications, demonstrating improved electrochemical selectivity and reduced methanol crossover.
研究不足
The study does not address the scalability of the synthesis process or the long-term stability of the nanocomposite membranes beyond 100 hours of operation.
1：Experimental Design and Method Selection:
The study involves the synthesis of GNR-GQD hybrids through ultrasonication in chlorosulfonic acid, followed by sulfonation via diazotization. The nanohybrids are then dispersed in sulfonated poly(ether ether ketone) (sPEEK) to form nanocomposite membranes.
2：Sample Selection and Data Sources:
Pristine graphene nanoribbons (GNR) were purchased from Sigma Aldrich. Other chemicals were obtained from various suppliers as detailed in the paper.
3：List of Experimental Equipment and Materials:
High-resolution transmission electron microscopy (HR-TEM), laser-Raman spectroscopy, atomic force microscopy (AFM), Fourier transform-infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), thermo-gravimetric analysis (TGA), field emission-scanning electron microscopy (FE-SEM), and energy dispersive X-ray spectroscopy (EDS) were used for characterization.
4：Experimental Procedures and Operational Workflow:
The synthesis of GNR-GQD hybrids, their sulfonation, and incorporation into sPEEK membranes are described. The membranes were characterized for physico-chemical properties and tested in DMFC setups.
5：Data Analysis Methods:
Proton conductivity, methanol permeability, and DMFC performance were analyzed using standard electrochemical techniques.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
Graphene nanoribbons
≥ 90.0% carbon basis, L × W: 2-15 μm × 40- 250 nm
Sigma Aldrich
Used as a base material for synthesizing GNR-GQD hybrids.
-
Chlorosulfonic acid
Merck, Germany
Used for the synthesis of GNR-GQD hybrids.
-
Sulfanilic acid
ACS reagent
Acros organics, USA
Used for the preparation of 4-benzenediazonium sulfonate precursor.
-
Hypophosphorous acid
50 % AR
LobaChemie Pvt. Ltd. India
Used in the sulfonation process of GNR-GQD hybrids.
-
Ethyl alcohol
Hayman Group Ltd. UK
Used as a solvent in the synthesis process.
-
sPEEK polymer fibers
fumion? E-600, IEC ~ 1.65 meq g-1, Mw = 50,000 g mol-1, Mn = 14,000
Fumatech BWT GmbH, Germany
Used as the base polymer for nanocomposite membranes.
-
DMFC Anode and Cathode
Alfa Aesar, Germany
Used in the fabrication of membrane electrode assemblies (MEAs).
-
N, N-Dimethyl Acetamide
Sisco Research Laboratories Pvt. Ltd. India
Used as a solvent for membrane preparation.
-
Methanol
Rankem
Avantor performance Materials India limited, India
Used as fuel in DMFC performance evaluation.
-
Deionized water
MQ Res: 18.2 M?cm
Milli-Q
Used for washing and preparation of solutions.
-
登录查看剩余8件设备及参数对照表
查看全部
