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 cataly

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

Examples

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Example Embodiment

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

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

[0036] Preparation of Pt-Ni(OH) 2 :Pt precious metal is deposited on Ni(OH) 2 , Using microwave-assisted alcohol-reduction method, weigh chloroplatinic acid (10mg platinum) and 40mg Ni(OH) 2 Disperse it evenly in 50ml of ethylene glycol, adjust the pH to 11 with 1M sodium hydroxide solution, then heat it in a 700W microwave oven for 1 min, pause for 30 seconds, repeat the operation three times, cool to room temp...

Example Embodiment

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

[0041] The preparation method and specific operation are the same as in Example 1, where 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 Is the PtP prepared in this example 2 -The TEM image of CoP, it can be clearly seen from the figure that PtP 2 The nanoparticles are uniformly dispersed on CoP. The electrochemical test is the same as in Example 1. Figure 5 Is PtP 2 The cyclic voltammogram of the electrocatalytic oxidation of ethanol by the CoP catalyst shows 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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