Spinel CoFe₂O₄ supported on three dimensional graphene (3DG) is prepared by hydrothermal reaction, which is denoted as CoFe₂O₄/3DG. The 3DG is prepared by the templated method, where coal tar pitch (CTP) and MgO are used as the carbon source and the template, respectively. The microstructure and composition of the resultant have been investigated by X-ray diffraction as well as X-ray photoelectron spectroscopy indicating the formation of spinel CoFe₂O₄ and composite of CoFe₂O₄/3DG. The multilayer structure of 3DG and CoFe₂O₄/3DG is also examined by the Raman spectra. Electrochemically, CoFe₂O₄/3DG shows high-performance half-wave potential is 0.80 V vs. RHE in O₂-saturated 0.1 M KOH, which is compared to 20 wt% Pt/C. When evaluated for OER activity, CoFe₂O₄/3DG obtains a low overpotential 1.63 V vs. RHE (at j = 10 mA cm⁻²), which is 180 mV better than 20 wt% Pt/C. Moreover, it possesses excellent durability superior to 20 wt% Pt/C.

通过水热反应制备负载在三维石墨烯（3DG）上的尖晶石CoFe ₂ O ₄，称为CoFe ₂ O ₄ / 3DG。3DG通过模板化方法制备，其中煤焦油沥青（CTP）和MgO分别用作碳源和模板。通过X射线衍射以及X射线光电子能谱研究了所得物的微观结构和组成，其表明尖晶石CoFe ₂ O ₄的形成和CoFe ₂ O ₄ / 3DG的复合物。3DG和CoFe ₂ O ₄的多层结构还通过拉曼光谱检查了/ 3DG。电化学上，CoFe ₂ O ₄ / 3DG在O ₂饱和的0.1 M KOH中显示高性能半波电势相对于RHE为0.80 V ，而Pt / C为20 wt％。当评估OER活性时，CoFe ₂ O ₄ / 3DG相对于RHE的低过电势为1.63 V（在j = 10 mA cm ^-2时），比20 wt％Pt / C好180 mV。此外，它具有优于20 wt％Pt / C的优异耐久性。