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Spinel CoFe2O4 supported by three dimensional graphene as high-performance bi-functional electrocatalysts for oxygen reduction and evolution reaction
International Journal of Hydrogen Energy ( IF 8.1 ) Pub Date : 2018-12-11 , DOI: 10.1016/j.ijhydene.2018.11.120
Tingwei Zhang , Zhongfang Li , Likai Wang , Zhixu Zhang , Suwen Wang

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.



中文翻译:

三维石墨烯负载的尖晶石型CoFe 2 O 4作为用于氧气还原和放出反应的高性能双功能电催化剂

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。

更新日期:2018-12-11
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