%0 Journal Article
%T Isolated Fe Single Atomic Sites Anchored on Highly Steady Hollow Graphene Nanospheres as an Efficient Electrocatalyst for the Oxygen Reduction Reaction
%A Dongmei Sun
%A Huan Pang
%A Jingchun Wang
%A Lin Xu
%A Shaohua Wei
%A Xiaoyu Qiu
%A Yawen Tang
%J Archive of "Advanced Science".
%D 2019
%R 10.1002/advs.201801103
%X The rational design of economical and high©\performance nanocatalysts to substitute Pt for the oxygen reduction reaction (ORR) is extremely desirable for the advancement of sustainable energy©\conversion devices. Isolated single atom (ISA) catalysts have sparked tremendous interests in electrocatalysis due to their maximized atom utilization efficiency. Nevertheless, the fabrication of ISA catalysts remains a grand challenge. Here, a template©\assisted approach is demonstrated to synthesize isolated Fe single atomic sites anchoring on graphene hollow nanospheres (denoted as Fe ISAs/GHSs) by using Fe phthalocyanine (FePc) as Fe precursor. The rigid planar macrocycle structure of FePc molecules and the steric©\hindrance effect of graphene nanospheres are responsible for the dispersion of Fe¨CNx species at an atomic level. The combination of atomically dispersed Fe active sites and highly steady hollow substrate affords the Fe ISAs/GHSs outstanding ORR performance with enhanced activity, long©\term stability, and better tolerance to methanol, SO2, and NOx in alkaline medium, outperforming the state©\of©\the©\art commercial Pt/C catalyst. This work highlights the great promises of cost©\effective Fe©\based ISA catalysts in electrocatalysis and provides a versatile strategy for the synthesis of other single metal atom catalysts with superior performance for diverse applications
%K 3D graphene
%K nonprecious metals
%K oxygen reduction reaction
%K single Fe atoms
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6343057/