Hierarchical self-supported NiSe2/TiN@Ni12P5 on nickel foam for the urea oxidation reaction

The development of high-performance, low-cost, and non-noble metal catalysts for the urea oxidation reaction (UOR) as an alternative to oxygen evolution reaction (OER) has received much attention but remains a huge challenge. In this work, NiSe2/TiN@Ni12P5/NF catalysts with a stalactite structure were prepared by chemical vapor deposition to obtain the integrated electrode Ni12P5/NF on the nickel foam (NF), and subsequently NiSe2/TiN was formed on the Ni12P5/NF surface by the hydrothermal method. The designed catalyst delivers an ultra-low potential of 1.270 Vat 10 mA cm-2, and a Tafel slope of 33.3 mV dec-1 for UOR. Furthermore, the catalyst only shows a 1.7% decrease in potential after an 80-h stability test, which demonstrates its excellent stability. The prepared NiSe2/TiN@Ni12P5/ NF shows a high specific surface area, and the strengthening effect between TiN and NiSe2, endowing the catalyst a high activity and durability. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

In this study, NiSe2/TiN@Ni12P5/NF catalysts with a stalactite structure were prepared by chemical vapor deposition for urea oxidation reaction, showing excellent activity and stability.