Non-noble metal fuel cell oxygen reduction electrocatalyst

Abstract

The invention relates to a non-noble metal fuel cell oxygen reduction electrocatalyst which is a product obtained by a method comprising the steps of: (1) pretreatment of acetylene black; (2) mechanical grinding: mixing cobalt chloride (CoC12. 6H2O), nitrogen source (melamine or hexamethylene tetramine) and carbon black (acetylene black or Vulcan XC-72R) which have the mass ratio of 1: 2: 10 into a mortar for mechanical grinding for 30min until even dispersion; and (3) heat treatment: adopting a way of sectional type temperature rise under the nitrogen protection, namely, maintaining for 10min when raising 100 DEG C at every time, then raising the temperature again, and so on; finally, maintaining for 1-5h at the required temperature (500-900 DEG C), and stopping heating; and naturally cooling to the room temperature, and then closing nitrogen. The non-noble metal fuel cell oxygen reduction electrocatalyst is low in the price of raw materials, and greatly reduces the preparation cost of oxygen reduction catalyst. The method is simple, convenient and easy, and is suitable for large-scale production and preparation of the catalyst.

Description

technical field [0001] The invention belongs to the field of fuel cell catalysts, and more specifically relates to a non-noble metal fuel cell oxygen reduction electrocatalyst. Background technique [0002] The oxygen reduction reaction of current fuel cells requires the use of expensive platinum-based catalysts with poor methanol resistance, which hinders its large-scale application. Therefore, the research on cathode oxygen reduction catalysts with low price, good stability, good catalytic activity and methanol tolerance is of key significance for the large-scale commercial application of proton exchange membrane fuel cells. [0003] In the past few decades, a variety of non-precious metal or non-platinum catalysts have been developed, among which N 4 - Metal complex catalysts for macrocyclic compounds and derivatives (referred to as TM-N 4 type) is a very important class (Cicero W.B.Bezerra, Lei Zhang, Kunchan Lee, etc. A review of Fe-N / C and Co-N / C catalysts for the ox...

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Problems solved by technology

For example, patent CN101069857A discloses a halogen-substituted dinuclear phthalocyanine iron oxide reduction catalyst; patent CN101417242A discloses a composite non-noble metal oxygen reduction catalyst, etc. The disadvantage of this method is that the preparation process is complicated, the reaction conditions are harsh, and the yield is low Macrocyclic compounds such as porphyrin and phthalocyanine are also relatively expensive materials, and the preparation cost is high; the catalyst prepared by this method also has a gap with platinum-based catalysts in terms of catalytic activity and stability (Rajesh Bashyam, Piotr Zelenay.A class of non-precious metal composite catalysts for fuel cells. Nature, 443 (2006) 63-66)

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