Postsynthetic treatment of nickel–iron layered double hydroxides for the optimum catalysis of the oxygen evolution reaction
Zeitschrift:
npj 2D Materials and Applications
Jahrgang:
5
Heftnummer:
1
Verlegende Institution:
Nature Publishing Group
Publikationsdatum:
11.08.2021
Jahr:
2021
Seiten von - bis:
1-8
Sprache:
Englisch
Abstract:
Nickel–iron-layered double hydroxide (NiFe LDH) platelets with high morphological regularity and submicrometre lateral dimensions were synthesized using a homogeneous precipitation technique for highly efficient catalysis of the oxygen evolution reaction (OER). Considering edge sites are the point of activity, efforts were made to control platelet size within the synthesized dispersions. The goal is to controllably isolate and characterize size-reduced NiFe LDH particles. Synthetic approaches for size control of NiFe LDH platelets have not been transferable based on published work with other LDH materials and for that reason, we instead use postsynthetic treatment techniques to improve edge-site density. In the end, size-reduced NiFe LDH/single-wall carbon nanotube (SWCNT) composites allowed to further reduce the OER overpotential to 237±7 mV (< L>= 0.16±0.01 μm, 20 wt% SWCNT), which is one of the …