Hybrid cobalt–manganese oxides prepared by ordered steps with a ternary nanosheet structure and its high performance as a binder-free electrode for energy storage,Nanoscale

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Hybrid cobalt–manganese oxides prepared by ordered steps with a ternary nanosheet structure and its high performance as a binder-free electrode for energy storage
Nanoscale ( IF 5.8 ) Pub Date : 2020-12-31 , DOI: 10.1039/d0nr08624j
Qingjie Lu _{1,

2,

3,

4,

5} , Shiqiang Zhou _{1,

2,

3,

4,

5} , Mingpeng Chen _{6,

7,

8} , Bo Li _{1,

2,

3,

4,

5} , Haitang Wei _{1,

2,

3,

4,

5} , Baoye Zi _{1,

2,

3,

4,

5} , Yumin Zhang _{1,

2,

3,

4,

5} , Jin Zhang _{1,

2,

3,

4,

5} , Qingju Liu _{1,

2,

3,

4,

5}

Affiliation

Binder-free electrodes for supercapacitors have attracted much attention as no additive is required in their preparation processes. Herein, a hybrid metal oxide composed of graphene oxide (Co₃O₄/MnO₂/GO) was successfully prepared. Briefly, electrochemical deposition and sintering were applied to grow Co₃O₄ nanosheets on nickel foam. Subsequently, MnO₂ nanosheets were deposited on Co₃O₄ nanosheets via the thermal decomposition of a KMnO₄ aqueous solution. Finally, graphene oxide was added to improve the performance of the composite. Particularly, the as-obtained Co₃O₄/MnO₂/GO sample grown on nickel foam possessed a ternary nanosheet structure, and when applied as a binder-free electrode in a supercapacitor, it exhibited an excellent electrochemical performance. Firstly, the electrode exhibited an ultrahigh capacitance value of 2928 F g⁻¹ at 1 A g⁻¹ in a three-electrode system. Besides, the electrode showed a promising rate performance of 853 F g⁻¹ at a high current density of 20 A g⁻¹. Moreover, the electrode displayed a relatively high energy density of 97.92 W h kg⁻¹ at a power density of 125 W kg⁻¹ and long cycle life of 93% retention after 5000 cycles at 10 A g⁻¹ in a two-electrode system. Thus, all the electrochemical tests suggest that the Co₃O₄/MnO₂/GO binder-free electrode is a potential candidate for energy storage.

中文翻译：

通过有序步骤制备的具有三元纳米片结构的钴-钴混合氧化物，其高性能作为无粘合剂的储能电极

超级电容器用无粘合剂电极备受关注，因为在制备过程中不需要添加剂。在此，成功制备了由氧化石墨烯（Co ₃ O ₄ / MnO ₂ / GO）组成的杂化金属氧化物。简而言之，进行电化学沉积和烧结以在泡沫镍上生长Co ₃ O ₄纳米片。随后，通过KMnO ₄水溶液的热分解将MnO ₂纳米片沉积在Co ₃ O ₄纳米片上。最后，添加氧化石墨烯以改善复合材料的性能。特别地，所获得的Co ₃在镍泡沫上生长的O ₄ / MnO ₂ / GO样品具有三元纳米片结构，当作为超级电容器中的无粘合剂电极使用时，其表现出优异的电化学性能。首先，在三电极系统中，该电极在1 A g ^-1下表现出2928 F g ^-1的超高电容值。此外，该电极在20 A g ^-1的高电流密度下显示出有希望的853 F g ^-1的速率性能。此外，电极在125 W kg ^-1的功率密度下显示出97.92 W h kg ^-1的相对较高的能量密度，在10 A g ^{-1的条件下}经过5000次循环后，具有93％的长循环寿命在两电极系统中。因此，所有的电化学测试表明，无Co ₃ O ₄ / MnO ₂ / GO粘结剂电极是潜在的储能候选材料。

更新日期：2021-01-22

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