Preparation and Electrocatalysis Performance of Graphene Supported Pt-Co High-Efficiency Catalyst AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY23030036

Chinese Library Classification Number:TM911

Citation Information:

As is known to all，environmental pollution and energy crisis are serious challenges faced by human society due to the rapid growth of energy demand and the burning of fossil fuels. Direct ethanol fuel cell （DEFC） has received extensive attention from researchers in various countries because of its advantages of low noise and high energy. However，it cannot be industrialized because of its low efficiency and high cost. Therefore，a series of high-efficiency nanocatalysts with graphene oxide as the carrier were prepared by adjusting the molar ratio of Pt-Co metal precursors by microwave synthesis，used ethylene glycol as the reducing agent and chloroplatinic acid as the precursor material，and reduced the amount of Pt-Co by adding non-noble metal Co，and a series of high-efficiency nanocatalysts with graphene oxide as the carrier were prepared，so the in-situ growth of catalyst grains on graphene oxide support was realized. X-ray diffraction （XRD） patterns showed that：when Co was inserted into Pt lattice instead of a solid solution，the atomic radius of Co was less than the atomic radius of Pt，and the smaller Co atom replaces Pt atom，causing Pt lattice to contract，causing the diffraction peak to move at a large angle. From transmission electron microscope （TEM） and high-resolution TEM （HRTEM） images，it could be seen that the average grain size of Pt₁Co_1/7/G catalyst was 3.00 nm，which corresponded to the （111） crystal plane of PtCo. The interplanar crystal spacing of Pt₁Co_x/G catalyst were 0.224 nm，which were less than the interplanar crystal spacing of Pt（111） by 0.230 nm，showing that the addition of Co could reduce the grain size of Pt nanocatalysts and PtCo alloys were formed in Pt₁Co_x/G catalysts. X-ray photoelectron spectroscopy （XPS） results showed that there were two states of Pt（0） and Pt（Ⅱ） in the synthesized catalyst，and it was proved that the introduction of Co affected the electronic structure of the surface layer of Pt，and Co electrons were transferred to Pt，so that the electronic properties of Pt 4f changed，and the electrons on the surface of Pt increased. The electron density of Pt surface increased，and the binding energy decreased. This change could weaken the adsorption of toxic substances in the catalytic reaction，which was conducive to improve the electrocatalytic performance of Pt₁Co_x/G catalysts. The electrochemical test results showed that：when the molar ratio of Pt/Co was 1∶1/7 （Pt₁Co_1/7/Gcatalyst），the catalytic activity of the catalyst was the highest，the electrocatalytic active surface area was 73.14 m²·g^-1，the peak oxidation current density was 905.38 mA·cm^-2，and the steady-state current density was 194.97 mA·cm^-2. Pt₁Co_x/G catalyst had good electrocatalytic performance，and its electrocatalytic performance was 3 times higher than commercial Pt/C catalyst，indicating that high-performance Pt₁Co_x/G catalysts could be prepared by microwave synthesis and the addition of cheap metal Co. It showed that Pt₁Co_x/G catalysts prepared by microwave-assisted method，with ethylene glycol as reducing agent and chloroplatinic acid as precursor material，and reduced the amount of Pt by adding non-precious metal Co had excellent performance. This research could provide a theoretical basis for the development and application of catalyst materials.