The article "Platinum-Gold Nanoparticles: A Highly Active Bifunctional Electrocatalyst for Rechargeable Lithium-Air Batteries" by Yi-Chun Lu et al. (2010) explores the development of a bifunctional electrocatalyst for lithium-air batteries. The authors synthesized PtAu nanoparticles by reducing HAuCl4 and H2PtCl6 in oleylamine, which were then loaded onto Vulcan carbon to form 40 wt% PtAu/C. Transmission electron microscopy and X-ray diffraction confirmed the uniform distribution and solid-solution nature of Pt and Au atoms in the nanoparticles. The electrochemical performance of PtAu/C was evaluated in Li-O2 cells, showing significantly higher round-trip efficiency compared to pure carbon, Pt/C, and Au/C. During discharge (oxygen reduction reaction, ORR), PtAu/C exhibited a higher discharge voltage than pure carbon. During charge (oxygen evolution reaction, OER), the charge voltages of PtAu/C were lower than those of pure carbon, but still efficient. The study also found that the surface Pt and Au atoms of PtAu/C are responsible for the ORR and OER kinetics, respectively, demonstrating the potential of this material as a highly active bifunctional catalyst for Li-air batteries.The article "Platinum-Gold Nanoparticles: A Highly Active Bifunctional Electrocatalyst for Rechargeable Lithium-Air Batteries" by Yi-Chun Lu et al. (2010) explores the development of a bifunctional electrocatalyst for lithium-air batteries. The authors synthesized PtAu nanoparticles by reducing HAuCl4 and H2PtCl6 in oleylamine, which were then loaded onto Vulcan carbon to form 40 wt% PtAu/C. Transmission electron microscopy and X-ray diffraction confirmed the uniform distribution and solid-solution nature of Pt and Au atoms in the nanoparticles. The electrochemical performance of PtAu/C was evaluated in Li-O2 cells, showing significantly higher round-trip efficiency compared to pure carbon, Pt/C, and Au/C. During discharge (oxygen reduction reaction, ORR), PtAu/C exhibited a higher discharge voltage than pure carbon. During charge (oxygen evolution reaction, OER), the charge voltages of PtAu/C were lower than those of pure carbon, but still efficient. The study also found that the surface Pt and Au atoms of PtAu/C are responsible for the ORR and OER kinetics, respectively, demonstrating the potential of this material as a highly active bifunctional catalyst for Li-air batteries.