研究目的
Design and synthesis of electrocatalysts for oxygen reduction reactions (ORR) with sustainable and high performance for the practical industrial development of fuel cells.
研究成果
The Co-CoOX/Co-N-C possesses enhanced ORR performance in terms of positive onset-potential and half wave potential, high stability, as well as the accelerated reaction kinetics. The uniformly dispersed cobalt exists in the form of Co0, cobalt oxide and Co-N-C accelerate the catalytic activity.
1：Experimental Design and Method Selection:
The coordination of NH2-carbon quantum dots (NCQDs) with Co2+ on carbon black was achieved via one-pot and low-cost hydrothermal treatment. Citric acid (CA) and urea (UA) were used as carbon and nitrogen sources for NCQDs.
2：Sample Selection and Data Sources:
The mixture was sonicated for 20 minutes in 50 mL DI water to form a homogeneous dispersion, then transferred into a Teflon-lined autoclave chamber and heated to 180 oC for 8 h.
3：List of Experimental Equipment and Materials:
TENSOR Model 27 FT-IR spectrometer, UV-3600 UV-vis spectrophotometer, Edinburgh Analytical Instruments FLS920 fluorescence spectrophotometer, Bruker D8 X-ray diffractometer, iHR550 Raman microscope, FEI Tecnai 20 electron microscope, jeol jem2100f HRTEM, PHI Quantera II ESCA System XPS.
4：Experimental Procedures and Operational Workflow:
The obtained samples were centrifuged at 8000 rpm for 10 min to remove excess reactants, then dried in freeze dryer at -40 oC overnight.
5：Data Analysis Methods:
The crystalline nature was investigated by XRD, morphology and size by TEM and HRTEM, and surface functional properties by XPS.
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UV-vis spectrophotometer
UV-3600
Shimadzu
Measuring ultraviolet absorption spectra
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Raman microscope
iHR550
HORIBA scientific
Testing Raman spectra
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FT-IR spectrometer
TENSOR Model 27
Performing Fourier transform infrared (FTIR) spectroscopy
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Fluorescence spectrophotometer
FLS920
Edinburgh Analytical Instruments
Measuring fluorescence excitation and emission spectra
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X-ray diffractometer
Bruker D8
Collecting X-ray diffraction (XRD) patterns
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Transmission electron microscope
FEI Tecnai 20
Analyzing detailed morphology and size
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High-resolution transmission electron microscope
jeol jem2100f
Analyzing detailed morphology and size
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X-ray photoelectron spectroscopy
PHI Quantera II ESCA System
Investigating the crystalline structure and the surface functional properties
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