Hollow hybrid heterostructures are regarded to be promising materials as bifunctional electrocatalysts for highly efficient water electrolysis due to their intriguing morphological features and remarkable electrochemical properties. Herein, with FeNi-PBA as both a precursor and morphological template, we demonstrate the rational construct of cost-effective (Fe,Ni)S₂@MoS₂/NiS₂ hollow hybrid heterostructures as bifunctional electrocatalysts for alkaline overall water splitting. Microstructural analysis shows that the hybrid is a kind of hierarchical heterostructure composed of MoS₂/NiS₂ nanosheets/nanoparticles in situ grown on hollow (Fe,Ni)S₂ nanocubes with abundant heterointerfaces, which effectively maximizes the electrochemical active sites to the accessible electrolyte ions, leading to the promoted charge transfer. As expected, the hybrid shows remarkable alkaline electrocatalytic performance, such as hydrogen evolution overpotential of 176 mV and oxygen evolution overpotential of 342 mV at 50 mA cm⁻², as well a cell voltage of 1.65 V at 20 mA cm⁻². Moreover, the stability and durability are greatly enhanced under harsh electrochemical conditions. This study opens a new venue for developing earth-abundant bifunctional electrocatalysts with hollow hybrid heterostructures for alkaline water electrolysis in the future.

中空杂化异质结构因其有趣的形态特征和显着的电化学性能而被认为是作为高效水电解双功能电催化剂的有前景的材料。在此，我们以 FeNi-PBA 作为前体和形态模板，证明了合理构建具有成本效益的 (Fe,Ni)S ₂ @MoS ₂ /NiS ₂空心杂化异质结构作为碱性整体水分解的双功能电催化剂。微观结构分析表明，该杂化物是一种由MoS ₂ /NiS ₂纳米片/纳米颗粒在空心(Fe,Ni)S _2上原位生长的分级异质结构。具有丰富异质界面的纳米立方体，有效地将电化学活性位点最大化到可接近的电解质离子，从而促进电荷转移。正如预期的那样，该杂化物表现出显着的碱性电催化性能，例如在 50 mA cm -2 时析氢过电位为 176 mV，析氧过电位为 342 mV，^{在 20 mA cm -2时}电池电压为 1.65 V。此外，在恶劣的电化学条件下，稳定性和耐用性大大提高。这项研究为未来开发用于碱性水电解的具有空心杂化异质结构的储量丰富的双功能电催化剂开辟了新的途径。