Recently, Cell Publishing's flagship journal, Chem Online, published the latest progress in the research of the high-performance FePt-Fe3C interface low platinum fuel cell electrocatalyst for the research group Guo Shaojun.
The commercial application of proton exchange membrane fuel cells is limited by the slow oxygen evolution kinetics of the cathode. At present, the most effective strategy for improving the catalytic activity of oxygen reduction is to optimize the bonding energy between the catalyst and the oxygen-containing species by controlling the transition metal M (M = Fe, Co, Ni, Cu, etc.) and the noble metal Pt alloying. Enhanced oxygen reduction catalytic activity. Recent studies have shown that, compared to surface catalysts, interfacial catalysts can provide another effective way to enhance the oxygen reduction catalytic activity. However, how to design an efficient interface catalyst with a new interface enhancement mechanism remains a huge challenge. Due to their high electrical and thermal conductivity, excellent mechanical strength, hardness, chemical stability, and corrosion resistance, carbides of transition metals have gained considerable attention in recent years. Creating a new interface catalyst is still a huge challenge by combining PtM and transition metal carbides.
To solve these problems, Guo Shaojun's team at the Beijing University of Technology designed and developed a new type of dumbbell-shaped PtFe-Fe2C nanoparticles. The dumbbell-shaped PtFe-Fe2C nanoparticles were obtained by carbonizing dumbbell-shaped PtFe-Fe3O4 nanoparticles (Fig. 1a). Electrochemical tests showed that the specific activity and mass activity of the catalyst for oxygen reduction in acidic media were 3.53 mA cm−2 and 1.50 A mg−1, respectively, which were 11.8 and 7.1 times higher than those of commercial Pt/C, respectively. Extremely excellent electrochemical stability, with almost no attenuation of the activity of the catalyst after 5000 cycles. The team further calculated and found that this unique structure has a novel, barrier-free interface electron transport mechanism that is more conducive to the electrocatalytic reaction and thus enhances electrocatalytic activity (Figure 1b). This barrier-free interface electron transport mechanism can also be extended to other electrocatalytic systems such as electrocatalytic hydrogen evolution reactions and electrocatalytic hydrogen peroxide reduction. The specific activity of the catalyst for hydrogen evolution in acidic media was 28.2 mA cm −2 , which was 2.9 times higher than commercial Pt/C. The detection limit of the hydrogen peroxide based electrochemical sensor reaches 2nM. This work has guiding significance for the theoretical study of electrocatalysis and the development of new high-efficiency fuel cell electrocatalysts, and it also provides new ideas for the structural design of the next generation of high-performance low-cost electrocatalysts.
Figure 1. a) Synthetic diagram; b) PtFe- Fe 3 O 4 nanoparticles; c) PtFe- Fe 2 C nanoparticles; d) DFT calculations
The work was completed by the Guo Shaojun team of the Beijing University’s College of Engineering. Guo Shaojun is the author of the paper, and the postdoctoral fellow Lai Jianping and Dr. Huang Bolong of the Hong Kong Polytechnic University are the co-first authors. The project was supported by projects supported by the National Natural Science Foundation of China and the Ministry of Science and Technology's key R&D plans and the Thousand Talents Program.
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