Issue 11, 2024

Facile synthesis of nanostructured Ni/NiO/N-doped graphene electrocatalysts for enhanced oxygen evolution reaction

Abstract

Electrocatalysts containing a Ni/NiO/N-doped graphene interface have been synthesised using the ligand-assisted chemical vapor deposition technique. NiO nanoparticles were used as the substrate to grow N-doped graphene by decomposing vapours of benzene and N-containing ligands. The method was demonstrated with two nitrogen-containing ligands, namely dipyrazino[2,3-f:2′,3′-h]quinoxaline-2,3,6,7,10,11-hexacarbonitrile (L) and melamine (M). The structure and composition of the as-synthesized composites were characterized by XRD, Raman spectroscopy, SEM, TEM and XPS. The composite prepared using the ligand L had NiO sandwiched between Ni and N-doped graphene and showed an overpotential of 292 mV at 10 mA cm−2 and a Tafel slope of 45.41 mV dec−1 for the OER, which is comparable to the existing noble metal catalysts. The composite prepared using the ligand M had Ni encapsulated by N-doped graphene without NiO. It showed an overpotential of 390 mV at 10 mA cm−2 and a Tafel slope of 78.9 mV dec−1. The ligand-assisted CVD route demonstrates a facile route to control the microstructure of the electrocatalysts.

Graphical abstract: Facile synthesis of nanostructured Ni/NiO/N-doped graphene electrocatalysts for enhanced oxygen evolution reaction

Supplementary files

Article information

Article type
Communication
Submitted
15 Feb 2024
Accepted
22 Apr 2024
First published
22 Apr 2024
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2024,6, 2813-2822

Facile synthesis of nanostructured Ni/NiO/N-doped graphene electrocatalysts for enhanced oxygen evolution reaction

R. Madampadi, A. B. Patel, C. P. Vinod, R. Gupta and D. Jagadeesan, Nanoscale Adv., 2024, 6, 2813 DOI: 10.1039/D4NA00141A

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