For the efficient and low-cost utilization of clean energy sources, the preparation of robust catalytic electrodes for the oxygen evolution reaction (OER, the key half-reaction in new energy conversion and storage systems) via a simple and time-saving preparation strategy is important. In this work, bimetallic Ni–Fe phytates are rapidly in situ grown on the surface of nickel foam (Ni–Fe-phy@NF) based on the robust complexation ability of the phytate ion. The phytate ion with multiple complexation sites promotes the formation of large cross-linking networks, which enhances the synergistic effect between Ni, Fe and P and the interaction between active materials and the nickel foam substrate. Besides, the partial dissolution of the phosphorus in the cross-linking networks induces the formation of abound porous structures during the OER process. This process is accompanied by the transformation from metal phytates to amorphous Ni–Fe-based oxides and hydroxides with a high valence state as efficient active sites for the OER. Therefore, the Ni–Fe-phy@NF electrode shows robust OER catalytic activity and enduring stability. Note that the synthetic strategy based on ligands with multiple complexation sites can be further used to rapidly design and prepare other novel three-dimensional electrode materials with improved catalytic performance.

中文翻译：

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植酸辅助超快速原位构建泡沫镍负载的无定形镍铁植酸盐，以提高析氧反应的催化性能

为了高效、低成本地利用清洁能源，通过简单、省时的制备策略制备用于析氧反应（OER，新能源转换和存储系统中的关键半反应）的稳健催化电极是重要的。在这项工作中，双金属 Ni-Fe 植酸盐在原位快速基于植酸离子的强大络合能力，在泡沫镍（Ni-Fe-phy@NF）的表面上生长。具有多个络合位点的植酸根离子促进了大型交联网络的形成，从而增强了Ni、Fe和P之间的协同作用以及活性材料与泡沫镍基材之间的相互作用。此外，交联网络中磷的部分溶解导致在 OER 过程中形成大量的多孔结构。该过程伴随着金属植酸盐向非晶态 Ni-Fe 基氧化物和氢氧化物的转变，这些氧化物和氢氧化物具有高价态作为 OER 的有效活性位点。因此，Ni-Fe-phy@NF 电极显示出强大的 OER 催化活性和持久的稳定性。