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Bi-functional catalyst for alkaline water system metal/air battery and preparation method thereof

A dual-function catalyst, air battery technology, applied in battery electrodes, fuel cell-type half-cells and primary battery-type half-cells, circuits, etc. problem, to achieve the effect of good conductivity, easy to scale up production, and cheap raw materials

Active Publication Date: 2016-05-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The German Journal of Applied Chemistry (2015) disclosed that a catalyst with certain catalytic activity for oxygen reduction and oxygen evolution reactions can be obtained by loading Ni, Co and its oxides on carbon nanotubes. The catalyst material uses carbon nanotubes. The cost of tube raw materials is high, it is difficult to apply on a large scale at the current stage, and its preparation method is cumbersome, especially when Ni and Co simple substances and their oxides are loaded on the surface of carbon nanotubes, their stability is relatively poor, and it is difficult to meet the application requirements.

Method used

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  • Bi-functional catalyst for alkaline water system metal/air battery and preparation method thereof
  • Bi-functional catalyst for alkaline water system metal/air battery and preparation method thereof
  • Bi-functional catalyst for alkaline water system metal/air battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0042] Add 0.05mol urea to 90mL of 0.05M nickel nitrate solution, stir until it completely dissolves into a transparent solution, package it in a reaction kettle, set the reaction temperature to 120°C, and the reaction time to 4h. Wash several times, filter and dry at 50°C to obtain the reaction precursor; ultrasonically disperse 0.5g of the above reaction precursor in 500mL of deionized water, and slowly dissolve the dopamine hydrochloride Add it, adjust the pH value to 8, stir at room temperature for 12 hours, wash the obtained product with water and alcohol, and then dry it at 50°C; place the above-mentioned dried product in a tube furnace, set the heating rate to 5°C / min, and hold the temperature at 600°C, holding time for 2 hours, and cooling naturally to obtain N-doped carbon-coated composite metal element. The composite catalyst obtained by the present invention has a reduction potential of -0.28V (vs.Ag / AgCl) in a 0.1M oxygen-saturated KOH solution, and an oxygen preci...

Embodiment 2

[0044] Add 0.06mol urea to 90mL solution containing 0.07M nickel nitrate and 0.14M cobalt nitrate, stir until completely dissolved into a transparent solution, package it in a reaction kettle, set the reaction temperature to 120°C, and the reaction time to 6h. The final product was washed several times with water and alcohol, filtered and dried at 50°C to obtain the reaction precursor; the above 0.5g reaction precursor was ultrasonically dispersed in 500mL deionized water, and the mass ratio of the precursor to dopamine hydrochloride monomer was 1 : 1, slowly adding dopamine hydrochloride wherein, adjusting the pH value to 8.8, stirring at room temperature for 24h, washing the product with water and alcohol and then drying at 60°C; 5°C / min, the holding temperature is 600°C, the holding time is 2h, and natural cooling is performed to obtain the N-doped carbon-coated composite metal element. The reduction potential of the composite catalyst obtained in the invention is -0.20V (v...

Embodiment 3

[0046] Add 0.06mol urea to 90mL of 0.1M cobalt nitrate solution, stir until completely dissolved into a transparent solution, package it in a reaction kettle, set the reaction temperature to 110°C, and the reaction time to 6h. Wash several times, filter and dry at 50°C to obtain the reaction precursor; ultrasonically disperse 0.8 g of the above reaction precursor in 800 mL of deionized water, and slowly dissolve the dopamine hydrochloride Add it, adjust the pH value to 8.2, stir at room temperature for 18 hours, wash the product with water and alcohol, and then dry it at 70°C; put the dried product above in a tube furnace, set the heating rate to 3°C / min, and hold the temperature temperature at 620°C, holding time for 2 hours, and cooling naturally to obtain an N-doped carbon-coated composite metal element. The composite catalyst obtained by the present invention has a reduction potential of -0.30V (vs.Ag / AgCl) in a 0.1M oxygen-saturated KOH solution, and an oxygen precipitati...

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Abstract

The invention discloses a bi-functional catalyst for an alkaline water system metal / air battery and a preparation method thereof. The catalyst is a core-shell structure material formed by coating transition metal simple substance particles by nitrogen doped carbon; the preparation process is: taking transition metal salt and urea as raw materials, obtaining precursors of transition metal simple substance particles through a hydrothermal method, coating nitrogen contained polymers on the surfaces of the precursors through in situ polymerization, and carrying out high-heat treatment to obtain the catalyst. The catalyst is good in stability, has bi-functional catalytic activity (ORR and OER) and has high catalytic activity in alkaline environment; the preparation technology is strong in controllability and easy in repetition and satisfies the industrial production demand.

Description

technical field [0001] The invention relates to an oxygen reduction and oxygen evolution catalyst for an alkaline water-based metal / air battery and a preparation method thereof, belonging to the fields of chemical power sources and electrochemical catalysis. Background technique [0002] As a metal fuel cell, alkaline aqueous metal / air battery has the advantages of high specific energy, low cost, environmental friendliness, and mechanical replacement (rapid charging of the metal / air battery can be achieved by replacing the fully discharged metal anode). , has attracted the attention of domestic and foreign scientific research workers in recent years. The alkaline aqueous metal / air battery consists of three parts: a metal anode, an alkaline electrolyte, and an air cathode. During battery discharge, metal dissolution occurs at the metal anode and oxygen reduction reaction (ORR) occurs at the air cathode. The ORR process is relatively complicated. It is generally believed tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/06
CPCH01M4/90H01M4/9041H01M12/06
Inventor 方静赖延清王梦然覃富荣刘文文于范张凯张治安李劼刘业翔
Owner CENT SOUTH UNIV
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