Advanced Materials:Fe Co existing Fe and Ni atoms on ordered porous carbon surface promote oxygen reduction efficiently
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proton exchange membrane fuel cell has the advantages of high energy conversion environmental protection. It has great potential in solving energy environmental problems. Its device efficiency cost greatly depend on its cathode electrocatalyst for oxygen reduction reaction. At present carbon supported metal single atom electrocatalyst is the most promising alternative to platinum. However this kind of electrocatalyst still has some problems such as insufficient catalytic activity difficult mass transfer of reactants in the cathode so on. Recent studies have shown that by introducing a second metal atom optimizing the nanostructure it is expected to further enhance the performance of carbon supported metal atom electrocatalysts. However it is still a challenge to develop a general method to prepare electrocatalysts with the above advantages.
recently Professor Zhao Huijun of Griffith University in Australia reported a heteroatom (h-sas) oxygen reduction (ORR) electrocatalyst. In this work nitrogen coordinated Fe Ni atoms are Co doped on ordered hierarchical porous carbon support which is composed of highly ordered macropores interconnected by micro / mesoporous. Xaner EXAFS confirmed that Fe - Ni SAS were anchored on carbon supports by fe-n4 ni-n4 coordination bonds. The prepared Fe / ni-h-sa electrocatalyst showed excellent orr activity which was superior to the electrocatalyst containing only Fe - or Ni SAS the benchmark Pt / C catalyst. The experimental theoretical results show that the high catalytic activity comes from the synergistic effect of co existing fe-n4 ni-n4 sites the ordered porous carbon supports promote the mass transfer ability of the materials. Based on this the electrocatalyst has significantly enhanced orr performance can be used as cathode material to enhance the device performance of zinc air cells proton exchange membrane fuel cells. This article was published in the international top material journal advanced materials (DOI: 10.1002/adma.202004670). The work of
not only provides a feasible way for efficient orr electrocatalysts zinc air cells proton exchange membrane fuel cells but also provides a reference for the rational design of other electrocatalysts involving the reaction of dissolved gases (such as N2 CO2). In addition it is expected to be applied in other metal air batteries metal sulfur batteries other fields.
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