Mn-PtM/C type platinum-based oxygen reduction catalyst as well as preparation method and application thereof

Abstract

The invention provides a Mn-PtM/C type platinum-based oxygen reduction catalyst and a preparation method and application thereof.The preparation method comprises the steps that a conductive carbon carrier with the large specific surface area is selected as a carrier, platinum nano-particles or platinum alloy nano-particles are loaded on the carbon carrier based on a polyol reduction method and with manganese as an auxiliary, and the Mn-PtM/C type platinum-based oxygen reduction catalyst is obtained; the Mn-PtM/C type platinum-based oxygen reduction catalyst is obtained through one-pot preparation, the preparation steps are simple, operation is convenient, and the yield reaches 90%; according to the prepared Mn-PtM/C type platinum-based oxygen reduction catalyst, Mn is used as an auxiliary agent, Mn and Pt do not form an alloy, the content of Pt is low, the cost is low, the addition of the auxiliary agent manganese plays a key role in reduction of platinum or platinum alloy, the dispersity and the particle size of the active component platinum nano particles or platinum alloy nano particles can be adjusted through the addition amount of Mn, and the stability and the stability of the catalyst are improved. The platinum-based oxygen reduction catalyst has improved oxygen reduction performance, and can provide high power density when applied to the field of batteries.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to the field of fuel cells and metal-air batteries, and in particular to a Mn-PtM / C platinum-based oxygen reduction catalyst and its preparation method and application. Background technique [0002] Metal-air battery (MAB) is a special type of fuel cell. It uses metals with negative electrode potential such as magnesium, aluminum, zinc, mercury, iron, etc. as the negative electrode, and uses oxygen in the air or pure oxygen as the active material of the positive electrode. The electrolyte solution of metal-air batteries generally uses an aqueous alkaline electrolyte solution. If lithium, sodium, calcium, etc. with more negative electrode potentials are used as negative electrodes, because they can react with water, only non-aqueous organic electrolytes such as phenol-resistant solid electrolytes or Inorganic electrolytes such as LiBF 4 salt solution etc. Metal-air batteri...

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Problems solved by technology

[0007] However, platinum-based oxygen reduction catalysts in the prior art still have the problem of agglomeration of platinum nanoparticles or platinum alloy nanoparticles, which reduces the loading of platinum nanoparticles or platinum alloy nanoparticles on the carrier, and platinum-based oxygen reduction catalysts in the prior art Oxygen reduction catalysts still suffer from low ORR performance

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