揭示锰掺杂 SrTiO3 的阴离子存储特性

IF 3.7 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

ACS Omega Pub Date : 2024-11-15 DOI:10.1021/acsomega.4c0891110.1021/acsomega.4c08911

Dushyant K. Sharma, Susanta S. Roy* and Binson Babu*,

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引用次数: 0

摘要

钛酸锶（STO）是一种立方过氧化物材料，最近作为一种超级电容器活性材料备受关注，其假电容储能归因于阴离子插层。然而，很少有人深入研究过 STO 及其掺杂金属的衍生物化合物的阴离子存储特性。在本研究中，我们探索了掺锰钛酸锶（Mn-STO）与原始 STO 相比的阴离子插入存储机制。通过固态反应合成的多晶 Mn-STO 与原始 STO 相比，电化学表面积增加了 3 倍，阴离子存储能力也得到了增强。详细的阴离子动力学和扩散研究表明，与 STO 相比，Mn-STO 中的阴离子存储主要由体积扩散控制的伪电容过程主导。此外，在含有 0.1 MnSO4 添加剂的 3 M KOH 水电解质中使用 Mn-STO 制造的超级电容器表现出卓越的循环稳定性，在 10000 次循环后仍能保持 100% 的电容，这凸显了 Mn-STO 作为超级电容器电极材料的应用潜力。

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Unraveling the Anion Storage Properties of Manganese-Doped SrTiO3

Strontium titanate (STO), a cubic perovskite material, has gained recent attention as a supercapacitor active material with its pseudocapacitive energy storage attributed to anion intercalation. However, very few in-depth studies have been conducted to understand the anion storage properties of STO and its metal-doped derivative compounds. In this study, we explored the anion-insertion storage mechanism of Mn-doped strontium titanate (Mn-STO) compared to pristine STO. The polycrystalline Mn-STO, synthesized via solid-state reaction, showed 3-fold times higher electrochemical surface area and exhibited enhanced anion storage compared to pristine STO. Detailed anion kinetics and diffusion studies reveal that the anion storage in Mn-STO is dominated by the bulk diffusion-controlled pseudocapacitive process than in STO. Further, the supercapacitor fabricated with Mn-STO in a 3 M KOH aqueous electrolyte with 0.1 M MnSO₄ additives demonstrated excellent cycling stability, retaining 100% capacitance after 10,000 cycles, highlighting the potential of Mn-STO as an electrode material for supercapacitor applications.

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来源期刊

ACS Omega Chemical Engineering-General Chemical Engineering

CiteScore

6.60

自引率

4.90%

发文量

3945

审稿时长

2.4 months

期刊介绍： ACS Omega is an open-access global publication for scientific articles that describe new findings in chemistry and interfacing areas of science, without any perceived evaluation of immediate impact.