APEFC non-precious metal catalyst latest research results released

"Nature · Communications" (Nature Communications) published online the latest research results of Zhuang Lin and Xiao Li from the School of Chemistry and Molecular Science on alkaline polymer electrolyte fuel cell (APEFC) non-precious metal catalysts.

The thesis is titled "Synergistic Mn-Co catalyst outperforms Pt on high-rate oxygen reduction for alkaline polymer electrolyte fuel cell" The author Wang Ying is a doctoral student of Professor Zhuang Lin.

APEFC is a new type of fuel cell, which is characterized by the use of non-precious metal catalysts, which is expected to greatly reduce the cost and solve the problem of China's current "stuck neck" that relies on the import of key materials for automotive fuel cells. Three years ago, the research group found that the MnCo spinel (MCS) catalyst found that although the catalytic activity of MCS for oxygen reduction reaction (ORR) in solution is lower than that of platinum (Pt) catalyst, its performance in batteries Not inferior to Pt, even better than Pt electrodes even under low humidity conditions. In the following year, the research team combined a variety of spectroscopy and calculation methods to fully reveal the mechanism behind this novel discovery. In the APEFC cathode, water molecules participate in the ORR but are not abundant, so the activation of water molecules becomes a key factor. In MCS catalysts, Mn and Co respectively play different roles. Mn activates O2 and Co activates H2O, which catalyzes the electrode reaction accompanied by proton transfer. This mechanism is lacking in relatively hydrophobic Pt surfaces.

This discovery not only reveals an important principle of fuel cell catalyst design, but also enables APEFC non-noble metal cathode performance to reach a high level, the single cell power density at 60oC reaches 1.1W / cm2. It is foreseeable that this research progress will strongly promote the practical process of APEFC. In this field, Zhuang Lin's research group has made continuous progress in the research of materials and catalysis since the first non-precious metal catalyst APEFC prototype was reported in the Proceedings of the National Academy of Sciences in 2008. Alkaline polyelectrolyte is a key material Commenced commercialization.

The work was supported by collaborators such as Professor Héctor D. Abruña of Cornell University, Professor Wang Jianbo of the School of Physical Science and Technology of Wuhan University, and Professor Huang Bingzhao of Taiwan University of Science and Technology in synchrotron radiation spectroscopy and spherical aberration correction transmission electron microscope testing. (Correspondent's Garden)

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