NiFe-based nanostructures have been attracting attentions as a promising non-noble metal electrocatalysts for oxygen evolution reaction in alkaline. In this paper, a bionic sunflower-like NiFe-polydopamine film was prepared via self-polymerization of dopamine-Ni²⁺/Fe³⁺ followed by partial pyrolysis process. In the films, NiO quantum dots are embedded in Fe-coupled polydopamine due to the space-confined effect of PDA. The self-activation process effect led to in-situ reconstruction of the generation of NiOOH and the migration of Fe sites to NiOOH surface. Abundant Fe sites on the NiOOH surface facilitated formation of stable O* intermediate. Moreover, the coordination-confined effect of PDA for Fe ions in the PDA network gave the PDANF catalyst excellent durability. The NiFe-polydopamine film exhibited excellent intrinsic OER activity with a low overpotential of 254.1 mV for 10 mA cm⁻² and an unprecedentedly low Tafel slope of 23.3 mV dec⁻¹.

NiFe基纳米结构作为一种有前途的非贵金属电催化剂用于碱性析氧反应而备受关注。本文通过多巴胺-Ni ²⁺ /Fe ³⁺自聚合制备了仿生向日葵状NiFe-聚多巴胺薄膜。其次是部分热解过程。在薄膜中，由于 PDA 的空间限制效应，NiO 量子点嵌入在 Fe 耦合的聚多巴胺中。自激活过程效应导致 NiOOH 生成的原位重建和 Fe 位点迁移到 NiOOH 表面。NiOOH 表面上丰富的 Fe 位点促进了稳定的 O* 中间体的形成。此外，PDA对PDA网络中Fe离子的配位限制作用使PDANF催化剂具有优异的耐久性。NiFe-聚多巴胺薄膜表现出优异的内在OER活性，10 mA cm ^{-2 的过}电位为254.1 mV，Tafel斜率空前低，为23.3 mV dec ^-1。