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 best values reported to date. This approach as well improved the long-term activity of the catalyst in operating conditions.
Highlights
One of the most significant concerns in modern society is the imminent energy crisis, which will be faced if fossil fuels cannot be successfully replaced by some renewable and clean alternative energy source[1,2]
NiFe Layered double hydroxides (LDH) was synthesized by way of homogeneous coprecipitation of Ni2+ and Fe3+ and using a triethanolamine (TEA) capping agent
The sharp hexagonal features and regular planar morphology have significance here because they are qualities which have been shown to improve catalytic performance for the oxygen evolution reaction (OER) relative to other morphologies, which may result from different synthetic routes[17]
Summary
One of the most significant concerns in modern society is the imminent energy crisis, which will be faced if fossil fuels cannot be successfully replaced by some renewable and clean alternative energy source[1,2]. The compatibility of the size-controlled material of NiFe LDH with composite additives will be investigated for even higher OER activity.
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