稀土掺杂工程定制具有可调结构的高级氧空位 Co3O4 以实现高效储能,Small

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稀土掺杂工程定制具有可调结构的高级氧空位 Co3O4 以实现高效储能
Small ( IF 13.0 ) Pub Date : 2022-12-11 , DOI: 10.1002/smll.202206956
Yao He ₁ , Weiqiang Zhou ₁ , Danqin Li ₁ , Yanmei Liang ₁ , Shixing Chao ₁ , Xueqian Zhao ₁ , Mingming Zhang ₁ , Jingkun Xu ₁

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具有高理论电容的Co ₃ O ₄ 是一种很有前途的高端能源应用电极材料，但Co 3 O 4 未激发的整体电化学活性、低电导率和较差的动力学_导致电荷_存储容量不令人满意。为了提高其储能能力，具有丰富氧空位的稀土 (RE) 掺杂 Co ₃ O ₄ 纳米结构是通过简单、经济且通用的化学沉淀法构建的。通过改变不同类型的稀土（RE = La、Yb、Y、Ce、Er、Ho、Nd、Eu）作为掺杂剂，稀土掺杂的Co ₃ O ₄^{纳米结构可以很好地从大纳米片转变为卷曲的微小纳米片，最终转变为超细纳米粒子，同时，其比表面积、孔隙分布、Co 2+} /Co ³⁺ 比值、氧空位含量、晶相、微应变参数和电容性能经常受到影响。值得注意的是，具有良好循环稳定性的 Eu 掺杂 Co ₃ O ₄纳米粒子在 2 A g ^{-1时显示出 1021.3 F g}^-1（90.78 mAh g ^-1 ）的最大比电容，高于 388 F g ^-1（34.49 mAh g ^-1 ) 的原始 Co ₃ O ₄ 纳米片。组装的非对称超级电容器可在 1.2 kW kg -1 的高功率密度下^{提供 48.23 Wh kg -1}^的高能量密度。这些发现表明稀土掺杂的Co ₃ O ₄ 在开发高效储能方面的重要性和巨大潜力。

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Rare Earth Doping Engineering Tailoring Advanced Oxygen-Vacancy Co3O4 with Tunable Structures for High-Efficiency Energy Storage

Co₃O₄ with high theoretical capacitance is a promising electrode material for high-end energy applications, yet the unexcited bulk electrochemical activity, low conductivity, and poor kinetics of Co₃O₄ lead to unsatisfactory charge storage capacity. For boosting its energy storage capability, rare earth (RE)-doped Co₃O₄ nanostructures with abundant oxygen vacancies are constructed by simple, economical, and universal chemical precipitation. By changing different types of RE (RE = La, Yb, Y, Ce, Er, Ho, Nd, Eu) as dopants, the RE-doped Co₃O₄ nanostructures can be well transformed from large nanosheets to coiled tiny nanosheets and finally to ultrafine nanoparticles, meanwhile, their specific surface area, pore distribution, the ratio of Co²⁺/Co³⁺, oxygen vacancy content, crystalline phase, microstrain parameter, and the capacitance performance are regularly affected. Notably, Eu-doped Co₃O₄ nanoparticles with good cycle stability show a maximum specific capacitance of 1021.3 F g⁻¹ (90.78 mAh g^-1) at 2 A g^-1, higher than 388 F g^-1 (34.49 mAh g^-1) of pristine Co₃O₄ nanosheets. The assembling asymmetric supercapacitor delivers a high energy density of 48.23 Wh kg^-1 at high power density of 1.2 kW kg^-1. These findings denote the significance and great potential of RE-doped Co₃O₄ in the development of high-efficiency energy storage.

更新日期：2022-12-11

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