Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Publication date: 11th July 2022
The development of robust and cost-effective catalysts is vital for the clean energy economy. Among of the non-noble metallic catalysts, transition metal nitrides showed promising electrocatalytic activities, and many possible structures were yet to be explored. Herein, nanostructured Cu3N, Ni3N, and a bimetallic hybrid structure were synthesized. The crystallographic structure was analyzed by X-ray diffraction, the morphology was characterized by transmission electron microscopy, and the surface analysis was done by photoelectron X-ray spectroscopy. These nanostructures were used for electrocatalysis of hydrogen evolution reaction (HER), oxygen reduction reaction (ORR), and methanolysis of ammonia-borane (AB). Cu3N showed superior catalytic activity for ORR with onset potential of 784 mV vs RHE, and for AB methanolysis with TOF of 0.84 min-1 at 30 °C. However, Ni3N showed better catalytic activity for HER in acidic media with overpotential of 245 mV at 10 mAcm-1 and Tafel slope of 145 mVdec-1,, also for alkaline media with 241 mV tat 10 mAcm-2 and tafel slope of 159 mVdec-1. The bimetallic hybrid showed intermediate activity between the binary materials.
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