Constructing highly efficient nonprecious electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is essential to improve the efficiency of overall water splitting, but still remains lots of obstacles. Herein, a novel 3D peony flower-like electrocatalyst was synthesized by employing Mo–Ni₂S₃/NF nanorod arrays as scaffolds to in situ growth ultrathin NiFe LDH nanosheets (Mo-Ni₂S₃@NiFe LDH). As expected, the novel peony flower-like Mo–Ni₂S₃@NiFe LDH displays superior electrocatalytic activity and stability for both OER and HER in alkaline media. Low overpotentials of only 228 mV and 109 mV are required to achieve the current densities of 50 mA cm⁻² and 10 mA cm⁻² for OER and HER, respectively. Additionally, the material remarkably accelerates water splitting with a low voltage of 1.54 V at 10 mA cm⁻², which outperforms most transition metal electrodes. The outstanding electrocatalytic activity benefits from the following these features: 3D peony flower-like structure with rough surface provides more accessible active sites; superhydrophilic surfaces lead to the tight affinity between electrode with electrolyte; metallic Ni substrate and highly conductive Mo–Ni₂S₃ nanorods scaffold together with offer fast electron transfer; the nanorod arrays and porous Ni foam accelerate gas bubble release and ions transmission; the strong interfacial effect between Mo-doped Ni₃S₂ and NiFe LDH shortens transport pathway, which are benefit for electrocatalytic performance enhancement. This work paves a new avenue for construction and fabrication the 3D porous structure to boost the intrinsic catalytic activities for energy conversion and storage applications.

构建用于析氧反应（OER）和析氢反应（HER）的高效非贵金属电催化剂对于提高总水分解效率至关重要，但仍然存在许多障碍。在此，以Mo-Ni ₂ S ₃ / NF纳米棒阵列为支架，原位生长超薄NiFe LDH纳米片（Mo-Ni ₂ S ₃ @NiFe LDH），合成了一种新颖的3D牡丹花状电催化剂。不出所料，新型牡丹花状的Mo–Ni ₂ S ₃ @NiFe LDH在碱性介质中对OER和HER均显示出优异的电催化活性和稳定性。只需228 mV和109 mV的低过电位即可达到50 mA cm的电流密度OER和HER分别为^-2和10 mA cm ^-2。另外，该材料在10 mA cm ^-2下以1.54 V的低电压显着加速了水分解，其性能优于大多数过渡金属电极。出色的电催化活性得益于以下这些特征：具有粗糙表面的3D牡丹花状结构提供了更易于接近的活性位点；超亲水表面导致电极与电解质之间的紧密亲和力；金属Ni衬底和高导电Mo–Ni ₂ S ₃纳米棒支架，可提供快速的电子转移；纳米棒阵列和多孔镍泡沫促进气泡释放和离子传输。钼掺杂镍之间的强界面效应₃ S ₂和NiFe LDH缩短了运输途径，有利于增强电催化性能。这项工作为构造和制造3D多孔结构铺平了一条新途径，以增强用于能量转换和存储应用的固有催化活性。