Interface Engineering of SRu-mC3N4 Heterostructures for Enhanced Electrochemical Hydrazine Oxidation Reactions

Hydrazine oxidation in single-atom catalysts (SACs) could exploit the efficiency of metal atom utilization, which is a substitution for noble metal-based electrolysers that results in reduced overall cost. A well-established ruthenium single atom over mesoporous carbon nitride (SRu-mC3N4) catalyst i...

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Bibliographic Details
Published in:Catalysts 2022-12, Vol.12 (12), p.1560
Main Authors: Munde, Ajay, Sharma, Priti, Dhawale, Somnath, Kadam, Ravishankar G., Kumar, Subodh, Kale, Hanumant B., Filip, Jan, Zboril, Radek, Sathe, Bhaskar R., Gawande, Manoj B.
Format: Article
Language:English
Subjects:
Carbon
Carbon nitride
Catalysts
Charge transfer
Chemical reactions
Electrochemical impedance spectroscopy
Electrodes
Fuel cells
Heterostructures
Hydrazines
Nanoparticles
Nitrogen
Noble metals
Oxidation
Ruthenium
Single atom catalysts
Substitution reactions
Transmission electron microscopy
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Summary:Hydrazine oxidation in single-atom catalysts (SACs) could exploit the efficiency of metal atom utilization, which is a substitution for noble metal-based electrolysers that results in reduced overall cost. A well-established ruthenium single atom over mesoporous carbon nitride (SRu-mC3N4) catalyst is explored for the electro-oxidation of hydrazine as one of the model reactions for direct fuel cell reactions. The electrochemical activity observed with linear sweep voltammetry (LSV) confirmed that SRu-mC3N4 shows an ultra-low onset potential of 0.88 V vs. RHE, and with a current density of 10 mA/cm2 the observed potential was 1.19 V vs. RHE, compared with mesoporous carbon nitride (mC3N4) (1.77 V vs. RHE). Electrochemical impedance spectroscopy (EIS) and chronoamperometry (i-t) studies on SRu-mC3N4 show a smaller charge-transfer resistance (RCt) of 2950 Ω and long-term potential, as well as current stability of 50 h and 20 mA/cm2, respectively. Herein, an efficient and enhanced activity toward HzOR was demonstrated on SRu-mC3N4 from its synergistic platform over highly porous C3N4, possessing large and independent active sites, and improving the subsequent large-scale reaction.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal12121560