Abstract
As one of the pentlandites, Fe5Ni4S8 (FNS) based materials have attracted increasing attention due to their excellent catalytic properties and promising applicability. The control over the catalyst surface structure often benefits its heterogeneous catalytic activity. However, this has not been investigated for FNS materials at the nanoscale regarding the catalytic activity related to high-index facets. Herein, FNS nanoparticles (FNSNPs) with enclosed continuous tunable high-index facets were prepared and studied to clarify the relationship between the structure and catalytic functionality. The results suggested strong dependence between exposed facets of FNSNPs and their sizes. The decline in the average size to 5.8 nm led to enclosing by high-index facets (422) and (511) to yield optimal electrocatalytic activities toward the hydrogen evolution reaction. The catalytic activity of FNSNPs was closely related to the surface energy of the main exposed facets. These findings clarified the relationship between high-index-facet and high-surface-energy FNSNPs, as promising approaches in crystal surface control engineering.
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