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The research results were selected as VIP papers and the first illustration papers. Map provided by China University of Science and Technology

Recently, the research team of Professor Gao Gan of the University of Science and Technology of China and the research team of Yang Qing jointly created a low-cost non-noble metal hydrogen oxidation catalyst with good carbon monoxide tolerance by introducing a small amount of cobalt modified molybdenum-nickel alloy catalyst. Relevant achievements were published in German Applied Chemistry, and were selected as VIP papers and first illustration papers.

Hydrogen and oxygen fuel power cells are expected to play an important role in the national dual-carbon strategy due to their high specific energy and zero emissions. However, commercial platinum-carbon catalysts are very easy to absorb carbon monoxide in hydrogen fuel and cause toxic shock. Especially in alkaline membrane fuel power cells, the hydrogen oxidation reaction kinetics of platinum-based catalysts are slow, and their synergistic use with carbon monoxide poisoning will accelerate the deterioration of battery performance. Therefore, designing and creating new anode catalysts with high activity and high resistance to carbon monoxide poisoning is a difficult problem to be solved in the application of alkaline membrane fuel power cells.

Theoretical calculation shows that the adsorption capacity of carbon monoxide on the nickel site is significantly reduced when cobalt is introduced into the molybdenum nickel alloy. This is because the introduction of cobalt will lead to electron-deficient nickel sites, which is conducive to reducing the adsorption capacity of the catalyst for carbon monoxide. The density of states diagram combined with a series of electronic structure characterization revealed that the center of the d band of a small amount of cobalt modified molybdenum-nickel alloy catalyst was far away from the Fermi level, and the reverse supply of electrons could not occur effectively, which was expected to bring high carbon monoxide tolerance.

The rotating disk electrode test showed that when the hydrogen fuel contained 500ppm carbon monoxide, the activity of the catalyst almost did not decline after 10000 cycles.

The researchers further investigated the anti-carbon monoxide poisoning performance of the catalyst under the membrane electrode assembly, and found that even in the hydrogen fuel containing 250 ppm carbon monoxide, a small amount of cobalt modified molybdenum-nickel alloy catalyst can supply 394 mW/cm2 of peak power density, which is more than 209 mW/cm2 of commercial platinum carbon catalyst. In pure hydrogen fuel, the peak power density of the catalyst can reach 525 mW/cm2, which is in the forefront of non-noble metal catalysts at present.

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