Transition metal phosphide-precious metal phosphide composite fuel cell catalyst and preparation method and application thereof

A transition metal and fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as weak interaction, catalyst instability, particle migration, etc., to enhance interaction force, realize large-scale production, and improve contact Effect

Active Publication Date: 2018-12-21
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patents 201410669156.9 and 201410669128.7 disclose a synthesis method of noble metal-transition metal phosphide anode electrocatalysts. Although this method greatly improves the activity of the catalyst, the preparation of the catalyst by using carbon as a composite carrier to support noble metal nanoparticles will cause Some serious problems like catalyst instability, particle migration, weak interactions, etc.

Method used

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  • Transition metal phosphide-precious metal phosphide composite fuel cell catalyst and preparation method and application thereof
  • Transition metal phosphide-precious metal phosphide composite fuel cell catalyst and preparation method and application thereof
  • Transition metal phosphide-precious metal phosphide composite fuel cell catalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: Synthesis of PtP 2 -Ni 2 P

[0035] Weigh 0.02mol of nickel chloride hexahydrate, dissolve it in 10ml of ultrapure water, stir at room temperature for 20min, add 10ml (6M) sodium hydroxide solution dropwise, continue stirring for 30min, add 0.6mmol of sodium sulfate to In the above solution, continue to stir for 10 minutes, then transfer to a 50ml autoclave, and keep at 170°C for 24 hours. Naturally cooled to room temperature, centrifuged and washed several times with ultrapure water, the obtained product was vacuum-dried at 60°C for 12 hours, and the product was Ni(OH) 2 .

[0036] Preparation of Pt-Ni(OH) 2 : Depositing Pt noble metal onto Ni(OH) 2 , using microwave-assisted alcohols-reduction method, weighed chloroplatinic acid (containing 10 mg of platinum) and 40 mg of Ni(OH) 2 Evenly disperse in 50ml of ethylene glycol, adjust the pH value to 11 with 1M sodium hydroxide solution, then heat in a 700W microwave oven for 1min, pause for 30s, repea...

Embodiment 2

[0040] Embodiment 2: Synthesis of PtP 2 -CoP

[0041] Preparation method and concrete operation are with embodiment 1, wherein with Ni(OH) 2 Change to Co(OH) 2 , while synthesizing Co(OH) 2 When replacing nickel chloride hexahydrate with cobalt chloride hexahydrate.

[0042] Figure 4 It is the PtP prepared in this embodiment 2 - TEM image of CoP, from which it is evident that PtP 2 The nanoparticles are uniformly dispersed on the CoP. Electrochemical test is identical with embodiment 1 operation, Figure 5 is PtP 2 -Cyclic voltammogram of the CoP catalyst for the electrocatalytic oxidation of ethanol, showing that the catalyst has catalytic performance for the electrocatalytic oxidation of ethanol.

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Abstract

The invention discloses a transition metal phosphide-precious metal phosphide composite fuel cell catalyst and preparation method and application thereof. At first, that noble metal is deposited on the transition metal hydroxide or oxide to prepare a composite body, and then the composite body is subjected to low-temperature phosphating to obtain a transition metal phosphate. The transition metalhydroxide or oxide and the noble metal are taken as raw material, and the noble metal is deposited on the transition metal hydroxide or oxide to prepare a composite body, and then the composite body is subjected to low-temperature phosphating to obtain a transition metal phosphate-precious metal phosphide composite catalyst. The invention directly loads the noble metal on the transition metal hydroxide or oxide, and then carries out low-temperature phosphating, effectively improves the contact between the noble metal and the carrier, enhances the interaction force between the noble metal and the carrier, improves the stability of the catalyst, and reduces the cost of the catalyst. The composite fuel cell catalyst has wide application prospect in fuel cell anode alcohol fuel oxidation and cathode oxygen reduction.

Description

technical field [0001] The invention belongs to the technical field of electrochemical fuel cells, and in particular relates to a transition metal phosphide-noble metal phosphide composite fuel cell catalyst and its preparation method and application. Background technique [0002] Direct alcohol fuel cell is a reaction device that directly uses liquid (such as methanol and ethanol) as fuel to convert chemical energy into electrical energy. Due to its high energy density, easy transportation and storage of fuel, low operating temperature and environmental friendliness It has broad application prospects in portable electronic equipment, electric vehicles and other fields, but some key technical problems still need to be solved before its large-scale commercial application. One of the problems is the electrode catalyst. Currently, the catalysts used in direct alcohol fuel cells are mainly Pt / C or Pd / C catalysts. However, these catalysts have serious disadvantages, such as poor...

Claims

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Application Information

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IPC IPC(8): H01M4/92
CPCH01M4/923H01M4/925Y02E60/50
Inventor 冯立纲王复龙郁旭方波
Owner YANGZHOU UNIV
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