Optimization of Pt atom utilization efficiency is critical for the development of proton-exchange-membrane fuel cells.Here we aim to develop an efficient oxygen reduction reaction(ORR)catalyst with a low Pt content th...Optimization of Pt atom utilization efficiency is critical for the development of proton-exchange-membrane fuel cells.Here we aim to develop an efficient oxygen reduction reaction(ORR)catalyst with a low Pt content through the concurrent modification of Pt-Co alloy catalysts and carbon substrate.In the present study,ultrafine Pt-Co alloy nanoparticles are successfully synthesized and stabilized by topological carbon defects via adopting the ammonia thermal treatment.Despite the low Pt loading,the obtained catalyst exhibits an impressive half-wave potential of 0.926 V versus the reversible hydrogen electrode in 0.1 M HClO_(4)electrolyte.Furthermore,the durability testing using the timed-current method demonstrates a tiny loss of only 3.6%after 12 h.Both experimental results and theoretical calculations demonstrate that topological carbon defects significantly enhance the charge transfer processes at the alloy/carbon interface,contributing to the strong electronic metal-support interactions between the Pt-Co alloy nanoparticles and topological carbon defects.These interactions,along with the alloy effect,play a crucial role in promoting the ORR performance in acidic media.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52002378 and 52171022)Anhui Provincial Natural Science Foundation(No.2208085Y16)+2 种基金Zhejiang Provincial Natural Science Foundation of China(No.LXR22B030001)Excellent Research and Innovation Team Project of Anhui Province(No.2023AH010001)Ningbo Natural Science Foundation(No.2021J198).
文摘Optimization of Pt atom utilization efficiency is critical for the development of proton-exchange-membrane fuel cells.Here we aim to develop an efficient oxygen reduction reaction(ORR)catalyst with a low Pt content through the concurrent modification of Pt-Co alloy catalysts and carbon substrate.In the present study,ultrafine Pt-Co alloy nanoparticles are successfully synthesized and stabilized by topological carbon defects via adopting the ammonia thermal treatment.Despite the low Pt loading,the obtained catalyst exhibits an impressive half-wave potential of 0.926 V versus the reversible hydrogen electrode in 0.1 M HClO_(4)electrolyte.Furthermore,the durability testing using the timed-current method demonstrates a tiny loss of only 3.6%after 12 h.Both experimental results and theoretical calculations demonstrate that topological carbon defects significantly enhance the charge transfer processes at the alloy/carbon interface,contributing to the strong electronic metal-support interactions between the Pt-Co alloy nanoparticles and topological carbon defects.These interactions,along with the alloy effect,play a crucial role in promoting the ORR performance in acidic media.
