Porous pdfe intermetallic compound modified by pt or au and its preparation method and application
A technology of intermetallic compounds and porous structures, applied in the field of electrochemistry, can solve the problems of poor cycle stability and low catalytic activity, and achieve high cathode oxygen reduction electrocatalytic activity and stability, good electrochemical stability, and equipment simple effect
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Embodiment 1
[0037] A preparation method of a Pt-modified porous PdFe intermetallic compound electrocatalyst, comprising the following steps:
[0038] (1) Preparation of PdFe intermetallic compound: Weigh 70 mg of carbon carrier and add it to 4 mL of acetic acid solution. After fully ultrasonically dispersed, add 42.65 mg of palladium acetate and 33.06 mg of ferrous acetate. dry solvent, after drying, the precursor sample was obtained, wherein the mass fraction of Pd in the precursor (including carbon support) was 20%; the obtained black powder was heated to 700°C in an argon flow for thermal decomposition treatment, and after 120min Cool to room temperature, that is.
[0039] (2) Porous PdFe intermetallic compound: Add a certain amount of the black powder prepared above into a mixed solvent of ethanol and hydrochloric acid aqueous solution (1:1, volume ratio), soak for 2 hours, and make the Fe atoms on the surface of the PdFe intermetallic compound generate Etching, enriching Pd at the...
Embodiment 2
[0042] A method for preparing a Pt-modified porous PdFe intermetallic compound electrocatalyst, comprising the following steps:
[0043] (1) Weigh 70mg carbon carrier, 42.65mg Pd(Ac) 2 and 33.06mg Fe(Ac) 2 Sequentially added to 4mL acetic acid solution, fully ultrasonicated and homogenized, the solvent was evaporated, and the precursor sample was obtained after drying, wherein the mass fraction of Pd in the precursor (including carbon support) was 20%. The obtained black powder was programmed to heat up to 650° C. for thermal decomposition in a nitrogen gas stream, kept for 120 min and then cooled to room temperature to obtain a PdFe intermetallic compound.
[0044] (2) Add a certain amount of black powder prepared in step (1) into a mixed solvent of ethanol and 0.5mol / L hydrochloric acid aqueous solution (1:1, volume ratio), soak for 2 hours, and make the Fe atoms on the surface of the PdFe intermetallic compound Etching occurs, and Pd is enriched at the same time; the Pd...
Embodiment 3
[0047] A method for preparing a Pt-modified porous PdFe intermetallic compound electrocatalyst, comprising the following steps:
[0048] (1) Weigh 85mg Pd(Ac) 2 and 66mg Fe(Ac) 2 Add it into 8mL acetic acid solution, add 140mg of carbon black after ultrasonic homogenization, evaporate the solvent after ultrasonic homogenization, and obtain a precursor sample after drying, wherein the mass fraction of Pd in the precursor (including carbon support) is 20%. The obtained black powder was programmed to heat up to 650° C. for thermal decomposition in a nitrogen gas stream, kept for 120 min and then cooled to room temperature to obtain a PdFe intermetallic compound.
[0049] (2) Porous PdFe intermetallic compound: Add a certain amount of black powder prepared in step (1) into a mixed solvent of 0.5M hydrochloric acid aqueous solution and ethylene glycol, soak for 1 hour, and make the Fe atoms on the surface of the PdFe intermetallic compound be engraved. At the same time, Pd is e...
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