Low-Cost High-Performance Hydrogen Evolution Electrocatalysts based on Pt-CoP Polyhedra with Low Pt Loading in both Alkaline and Neutral Media
Platinum is the most active and commonly used electrocatalyst for hydrogen evolution reaction(HER). Unfortunately, its expensive price and scarce supply limit its world-wild use for mass production of H2 by water electrolysis. Promising candidates for high-performance hydrogen evolution reaction with exceptionally low Pt loadings are seriously urged to obtain clean and sustainable chemical fuels. Herein, yolk-shell Pt-CoP polyhedra were prepared to realize a low Pt loading on low-cost CoP polyhedra substrates through a low temperature calcination, phosphorization of ZIF-67, combined with subsequent microwave-assisted platinum reduction process. Owing to the unique york-shell structure, large surface area, numerous active sites, trace Pt modification and the improved conductivity, the resulted catalyst exhibits high-efficiency electrocatalytic activities for HER with low overpotentials of only 48 mV and 88mV at 10 mA cm-2, respectively, and excellent stability in 1 M KOH and 1 M PBS solution, superior to most of newly reported noble metal based or transition metal based catalysts, even the state-of-the-art Pt/C catalysts.