Carbon-based materials derived from metal-organic framework compounds have tunable chemical composition, morphology, and electrochemically active surface combined with good electrical conductivity and stability. In this work, Fe(OH)₃ grows on a zeolitic imidazolate framework, 2-Methylimidazole cobalt salt (ZIF-67), through oxidation and deposition. The Co₉S₈/NC@FeCoS₂/NC composites with hollow yolk shell structure (HYS-Co₉S₈/NC@FeCoS₂/NC) is prepared through solvothermal sulfidation combined with high-temperature carbonization using ZIF-67@Fe(OH)₃ as the precursor. A dye-sensitized solar cell assembled with HYS-Co₉S₈/NC@FeCoS₂/NC as a counter electrode achieves a photovoltaic conversion efficiency of 7.07 % (PCE_Pt = 7.36%). The reason for this phenomenon is that the hollow yolk shell structure of Co₉S₈/NC@FeCoS₂/NC material has a high specific surface area, which affords a good deal of active sites and promotes the contact between electrolyte and catalytic sites. The Fe-Co bimetal center synergies with each other to catalyze the reduction of iodide ion, showing a high catalytic activity. Besides, the material has good electrochemical stability in iodide-based electrolysis.

源自金属有机骨架化合物的碳基材料具有可调的化学成分、形态和电化学活性表面，并具有良好的导电性和稳定性。在这项工作中，Fe(OH) ₃通过氧化和沉积在沸石咪唑酯骨架 2-甲基咪唑钴盐 (ZIF-67) 上生长。以ZIF-67@Fe为原料，通过溶剂热硫化结合高温碳化制备了具有空心蛋壳结构的Co ₉ S ₈ /NC@FeCoS _{2 /NC复合材料（HYS-Co 9} S ₈ /NC@FeCoS ₂ /NC） (OH) ₃作为前体。_{用 HYS-Co 9}组装的染料敏化太阳能电池S ₈ /NC@FeCoS ₂ /NC作为对电极实现了7.07%的光伏转换效率（PCE _Pt  = 7.36%）。造成这种现象的原因是Co ₉ S ₈ /NC@FeCoS ₂ /NC材料的空心蛋黄壳结构具有较高的比表面积，提供了大量的活性位点，促进了电解质与催化位点的接触。Fe-Co双金属中心相互协同催化碘离子的还原，表现出较高的催化活性。此外，该材料在碘化物电解中具有良好的电化学稳定性。