Effect of Platinum Precursor on the Properties of Pt/N-Graphene Catalysts in Formic Acid Decomposition

Abstract

Properties of a novel catalytic material, Pt/N-graphene, in gas-phase decomposition of formic acid to obtain pure hydrogen were studied. The graphene powder doped with nitrogen atoms was used as the carbon support. The following methods were used to characterize the synthesized catalysts: X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), EXAFS and CO chemisorption. It was determined that the platinum precursor substantially affects the state of the metal in the Pt/N-graphene catalysts. When Pt(NO3)4 was used as the precursor, platinum on the catalyst surface was in the form of nanocrystals. Meanwhile, the use of H2PtCl6 led to the formation of atomically dispersed platinum stabilized on the surface of N-graphene. Carbon structures containing defects in the graphene layer surrounded by four nitrogen atoms had strong interactions with platinum atoms and acted as the sites where atomic platinum was stabilized.

Interfacial and Electronic Modulation of M-Bridged Heterostructures with L-Tryptophan and Transition Metallic Oxides: Enhancing Corrosion Resistance and Photocatalytic Activity

“…The deconvolution of Zr 3d from ZrOF sample in Figure 6 (a) led to two peaks at ∼184.8 and ∼182.4 eV corresponded to the Zr−O bonding in the ZrOF complex. 38 As shown in Figure 6 39 As for TiOF sample, the Ti 2p spectrum in Figure 6(d) was fitted into two peaks at ∼463.90 and ∼458.22 eV corresponded to Ti 4+ 2p 1/2 and Ti 4+ 2p 3/2 confirming the formation of TiOF complex detected on the XRD analysis. 40 The deconvolution of C 1s and N 1s spectra in Figure 6(e),(f) led to similar peaks to those obtained in the case of ZrOF sample.…”

“…As shown in Figure (b), the fitting of C 1s spectrum led to four peaks at ∼284.5, ∼285.5, ∼286.4, and ∼290.3 eV, corresponded to C–C/CC, C–N, C-NH, and OC–O, respectively in the Trp structure. Deconvolution of N 1s shown in Figure (c) for ZrOF sample led to four peaks at binding energies of ∼403.2, ∼400.5, ∼399.6, and ∼398.8 eV, assigned to oxidized N, C–NH–C, N–H, and C–N–C, respectively . As for TiOF sample, the Ti 2p spectrum in Figure (d) was fitted into two peaks at ∼463.90 and ∼458.22 eV corresponded to Ti 4+ 2p 1/2 and Ti 4+ 2p 3/2 confirming the formation of TiOF complex detected on the XRD analysis .…”