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.

使用均相沉淀技术合成了具有高形态规律和亚微米横向尺寸的镍铁层状双氢氧化物 (NiFe LDH) 薄片，以高效催化析氧反应 (OER)。考虑到边缘位点是活动点，已努力控制合成分散体中的片晶大小。目标是可控地分离和表征尺寸减小的 NiFe LDH 颗粒。基于已发表的与其他 LDH 材料的工作，用于控制 NiFe LDH 片晶尺寸的合成方法尚未转移，因此，我们改为使用合成后处理技术来提高边缘位点密度。到底，L > = 0.16 ± 0.01 μm，20 wt% SWCNT），这是迄今为止报道的最佳值之一。这种方法也提高了催化剂在操作条件下的长期活性。