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Oxygen reduction and oxygen evolution cobalt phosphide@NPC double-function compound catalyst and preparation method and application thereof

A composite catalyst and bifunctional technology, applied in the field of electrocatalysis, can solve the problems of low activity and electrical conductivity, and achieve the effects of simple preparation method, high electrocatalytic activity, and obvious synergistic effect.

Active Publication Date: 2017-08-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For a single CoP in the prior art 2 As an ORR and OER electrocatalyst, there are defects of low activity and electrical conductivity. One of the purposes of the present invention is to provide a catalyst with high catalytic activity and good stability, which has both ORR and OER electrocatalytic activity, and its comprehensive catalytic performance is close to that of a commercial catalyst. Precious Metals 20wt% Pt / C and RuO 2 Catalyst Co 2 P@NPC bifunctional composite catalyst

Method used

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  • Oxygen reduction and oxygen evolution cobalt phosphide@NPC double-function compound catalyst and preparation method and application thereof
  • Oxygen reduction and oxygen evolution cobalt phosphide@NPC double-function compound catalyst and preparation method and application thereof
  • Oxygen reduction and oxygen evolution cobalt phosphide@NPC double-function compound catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] co 2 Preparation of P@NPC:

[0031] A synthetic method using two-step heat treatment, the specific process is as follows: 0.1g Co(Ac) 2 4H 2 O, 18.5 μL of concentrated phosphoric acid and 10 g of urea were dissolved in 5 mL of deionized water at 80 °C, and evaporated with stirring for about 40 min. Then the solid mixture was transferred to a 100 mL porcelain crucible with a cover and placed in a muffle furnace, the temperature was raised to 450 °C at a heating rate of 5 °C / min, kept for 1 h and then cooled naturally. After grinding the precursor evenly, the high-purity N 2 Heating to 800°C at a rate of 10°C / min in the atmosphere, holding for 1h, and cooling naturally to obtain Co 2 P@NPC-1. co 2 The mass percentage content of P nanorods and nanoparticles is about 26%, the mass percentage content of the N and P co-doped carbon layer is about 74%, the N mass percentage content in the N-doped carbon layer is about 12%, and the P-doped carbon layer The mass percent c...

Embodiment 2

[0040] According to the method of Example 1, the raw material is changed into 0.2g Co(Ac) 2 4H 2 O, 37 μL concentrated phosphoric acid and 10 g urea to prepare Co 2 P@NPC-2 complex.

[0041] The evaluation method of catalytic performance is the same as in Example 1.

[0042] co 2 The P@NPC-2 composite exhibited a peak potential of 0.838 V (vs. RHE) in the CV curve as an ORR catalyst. The LSV curve shows that Co 2 The half-wave potential of P@NPC-1 is 0.820V (vs.RHE), and the limiting current density is 4.068mA / cm 2 .

[0043] co 2 The P@NPC-2 composite was used as an OER catalyst, and the LSV curves were shown at current densities of 10 and 20 mA / cm 2 The required overpotential is η 10 =337mV and η 20 =379mV, the Tafel slope is 135mV / dec.

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Abstract

The invention discloses an oxygen reduction and oxygen evolution Co2P@NPC double-function compound catalyst and a preparation method and application thereof. The compound catalyst comprises N-P-codoped carbon layer coated Co2P nano rods and / or nano particles. The preparation method includes: evaporating and drying the solution of cobalt acetate, concentrated phosphoric acid and urea, and performing high-temperature treatment under protective atmosphere to obtain the compound catalyst. The preparation method has the advantages that the method is simple, low in cost and beneficial to industrial production; the prepared oxygen reduction and oxygen evolution Co2P@NPC double-function compound catalyst is applicable to fuel cell and water decomposition, high in activity and good in stability, the catalytic performance of the compound catalyst is close to that of a commercial precious metal 20wt% Pt / C and RuO2 catalyst, and the compound catalyst is promising in application prospect.

Description

technical field [0001] The present invention relates to an oxygen reduction (ORR) and oxygen evolution (OER) Co 2 P@NPC dual-functional composite catalyst and its preparation and application methods, especially an oxygen evolution N and P co-doped carbon layer coated Co that can be used for oxygen reduction in fuel cells and water splitting 2 P(Co 2 The invention discloses a P@NPC) bifunctional composite catalyst and a preparation method thereof, belonging to the technical field of electrocatalysis. Background technique [0002] ORR and OER reactions are important electrochemical reaction processes in fuel cells and water electrolysis, respectively. However, the complex multi-electron transfer process in the reaction will lead to high overpotential, which makes them have a slow reaction control step, and it is necessary to find efficient catalysts to increase the reaction rate to meet the needs of practical applications. At present, the best ORR catalyst is Pt-based catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J27/24H01M4/90C25B1/04C25B11/06
CPCB01J27/1853B01J27/24C25B1/04C25B11/04H01M4/9083Y02E60/36Y02E60/50
Inventor 钱东李军闵紫嫣刘桂雨刘贝贝
Owner CENT SOUTH UNIV
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