Two-Dimensional Free-Standing Platinum Supra-Nanostructures Film with Excellent Electrocatalytic Activity for Fuel Cell Application

The development of new electrocatalysts with high activity and oxidation stability for fuel cells is an emerging challenge for the development of advocate clean energy. However, most reports focus on the catalytic reaction path and improved stability by using bimetallic or trimetallic alloys. That undoubtedly increases its cost of catalysis and limits commercial applications. Herein, we have developed a universal strategy to construct a two-dimensional large-area hollow platinum supra-nanostructures film through a sacrificial template method. The obtained platinum supra-nanostructure film exhibits high catalytic activity and excellent durability for the electrooxidation of ethanol and methanol, owing to its unique ultra-thin hollow structure and interparticle synergistic effects of platinum supra-nanostructure array, which would effectively improve the atom utilization rate and the electron transfer rate. The platinum supra-nanostructures film with the thickness of 6 nm was the most prominent for the methanol catalytic reaction, showed a mass-normalized activity of 116.67 mA mg(-1), which was higher than the values of most reports. The film also had outstanding cycle stability with more than 200 CV cycles. The constructed platinum supra-nanostructures film is a promising candidate as high-performance electrocatalysts for fuel cells.