Interface Engineering of SRu-mC[sub.3]N[sub.4] Heterostructures for Enhanced Electrochemical Hydrazine Oxidation Reactions

• Published in: Catalysts 2022-12, Vol.12 (12)
• 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: Hydrazine; Oxidation-reduction reaction
• ISSN: 2073-4344; 2073-4344
• DOI: 10.3390/catal12121560

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-mC[sub.3]N[sub.4]) 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-mC[sub.3]N[sub.4] shows an ultra-low onset potential of 0.88 V vs. RHE, and with a current density of 10 mA/cm[sup.2] the observed potential was 1.19 V vs. RHE, compared with mesoporous carbon nitride (mC[sub.3]N[sub.4]) (1.77 V vs. RHE). Electrochemical impedance spectroscopy (EIS) and chronoamperometry (i-t) studies on SRu-mC[sub.3]N[sub.4] show a smaller charge-transfer resistance (R[sub.Ct]) of 2950 Ω and long-term potential, as well as current stability of 50 h and 20 mA/cm[sup.2], respectively. Herein, an efficient and enhanced activity toward HzOR was demonstrated on SRu-mC[sub.3]N[sub.4] from its synergistic platform over highly porous C[sub.3]N[sub.4], possessing large and independent active sites, and improving the subsequent large-scale reaction.