Preparation of TiO2 based two-phase composite and its electrocatalytic hydrogen evolution performance
As an inexpensive and widely used metal oxide,TiO2 with improved catalytic activity after processing and modification can be used in electrocatalysis field.In this paper,a hydrophilic anatase TiO2 with hierarchical flower-like structure was prepared and loaded with PdCu NPs on its surface.The obtained two-phase composite nanomaterial PdCu NPs@TiO2 had a large specific surface area and abundant active sites.The samples with different compositions of 5%,10%and 20%PdCu NPs@TiO2 were characterised by SEM,TEM,XRD,XPS and BET,and the activity changes of electrocatalytic hydrogen precipitation were evaluated using electrochemical tests.The results showed that the prepared Pd2Cu NPs@TiO2-10(Pd∶Cu=2∶1)HER electrocatalyst performed the best with low water adsorption/dissociation and H intermediate desorption energy barriers.It had a low overpotential of 35.8mV and a low Tafel slope of 46.3mV/dec at current density up to 10mA/cm2 under acidic condition.
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