The Study Of Transition Metal Oxides Used For Oxygen Evolution Reaction In Alkaline

Water splitting provides a potential path for producing clean, renewable H2 and O2. However, improving the overall efficiency of water splitting is a challenging issue. the research results indicate that the incorporation of nitrogen heteroatom and non-noble transition-metals into carbon materials can greatly improve the electrocatalytic performance. Hence, we designed transition metal oxides nanoparticles coupled nitrogen-enriched porous carbon nanosheets as highly efficient non-precious-metal electrocatalyst for oxygen evolution reaction(OER). The main works are introduced as follows:1. Schiff-base network(SNW) was based on commercially available and inexpensive monomers which were terephthalaldehyde and melamine. The resulting SNW possessed high nitrogen content and high surface areas. The characterization of SNW reveasl a series of agglomerates of interconnected imperfect spherical nanoparticles confined within a continuous pore network. Then Nitrogen-enriched Porous Carbon Nanosheets(NPC) was prepared using SNW as the precursor.2. NiyCo10-yOx/NPC and CoyFe10-yOx/NPC were prepared by the deposition of the Ni-Co and Co-Fe metal nanoparticles on the SNW surface and composites were carbonized in the high temperature. Lastly the materials were modified on glass carbon electrode for oxygen evolution reaction(OER) in alkaline.Electrochemical experiment tests showed that the best efficiency of OER was oneset at 1.51 V and requiring 328 m V over-potential to achieve a stable current density of 10 m A cm-2 for at least 15 h and a Tafel slope of 31.4 m V dec-1 in 1.0 M KOH solution, which were comparable even superior to many other non-noble metal catalysts. Besides, we proved that the role of Fe can increase the OER activity. More importantly, the support of electrode materials comes from the pyrolysis of porous polymers and this idea offers a new possibility for exploring overall water splitting non-precious-metal catalysts.