Synthesis Of Chromium And Iron - Based Carbon (nitrogen And Phosphorus) Based On Oxygen Reduction And Water Decomposition

Fuel cells and hydrogen which electrolyzed from water are considered the most promising energy conversion and storage means in the 21 st century. However, the core issues limited their development are the high cost, especially the cost of the catalysts which accounted for a large proportion. Currently, the cathodic and anodic reaction catalysts of fuel cells are Pt-based catalysts, and Ir- and Ru-based compounds have the highest activity toward the oxygen evolution reaction(OER), and platinum group metals are the most efficient hydrogen evolution reaction(HER) catalysts. It is the main focus of current research that reduce the usage of noble metals, while maintaining the excellent catalytic properties. Since chromium and iron-based carbide(nitride, phosphide) compounds have excellent electrical catalytic activity and the carbon materials possess superior electron conductivity and stability, which the studies that make their composite as electrocatalysts for fuel cell or water-splitting reaction catalysts is significant. Therefore, the main research contents in this paper have been shown as follows:1. Chromium carbide/ carbon(Cr2C3/C) hybrids have been synthesized via solvothermal-assisted ion-exchange route. Ion exchange resin are used as carbon source, metal ions are exchanged into the resin skeleton at the same time, and after solvothermal and carbide, the hybrids are synthesized. Cr2C3/C are used as highly efficient catalyst carrier for oxygen reduction reaction(ORR). Synthetic 10% Pt-Cr2C3/C shows the similar onset potential, more excellent half potential and stability, when compare with commercial Pt/C catalyst.2. Chromium nitride nanoparticles supported on graphitic carbon nanocapsules containing carbon nitride(CrN/GC) have been synthesized by a solvothermal-assisted ion-exchange route. As a Pt-free catalyst, the CrN/GC hybrid exhibits superior activity, stability, methanol immunity and a dominant 4-electron pathway towards oxygen reduction reaction.3. The CoP/rGO and Ni2P/rGO have been synthesized through solvothermal and phosphating route. The CoP/rGO electrocatalysts show superior catalytic activity and durability for both ORR and OER in strongly basic media. The Ni2P/rGO electrocatalysts has catalytic activity and durability for OER in basic media, at the same time show superior catalytic activity and durability for HER in strongly acidic media.