posted on 2020-09-01, 20:04authored byXiao Ge, Guirong Su, Wei Che, Jia Yang, Xiao Zhou, Zhiyuan Wang, Yunteng Qu, Tao Yao, Wei Liu, Yuen Wu
Single
atom catalysts (SACs) as a kind of bright star catalyst
have attracted great attention, constituting a series of intriguing
properties for catalytic reactions. Herein, a simple and ingenious
strategy is developed for the fabrication of SACs via atomic filtration
during a solid diffusion process under the assistance of graphene
oxide membranes (GOMs). First, driven by the heat treatment, the Fe
species (atoms, cluster, or particles) are emitted from Fe foam diffused
through the GOMs. By elaborately modulating the layer numbers of the
GOM and their interlayer spacing, the GOM could exclude the cluster
and particles of the Fe species. Thus, the permeable single Fe atoms
were trapped by defective N-rich sites, producing isolated Fe site
catalyst (Fe SAs/N–C). The fabricated SACs exhibited an excellent
catalytic performance for the oxygen reduction reaction (ORR). Furthermore,
this strategy can be easily expanded to prepare other SACs, such as
Co SAs/N–C and Ni SAs/N–C.