Enhanced Rate Capability in B-Site High-Entropy Perovskite Oxide Ceramics: The Case of La(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3

This study employed the solid-state method to prepare perovskite-type high-entropy oxide materials La(Co<sub>0.2</sub>Cr<sub>0.2</sub>Fe<sub>0.2</sub>Mn<sub>0.2</sub>Ni<sub>0.2</sub>)O<sub>3</sub> and La(Co<sub>0.2</sub>Cr<sub>0.2</sub>Ni<sub>0.2</sub>Ga<sub>0.2</sub>Ge<sub>0.2</sub>)O<sub>3</sub> with equimolar ratios at the B-site and explored the effects of sintering temperature on the phase structure and electrochemical properties of high-entropy oxide ceramics. The results show that after sintering at 1300°C, both samples exhibit orthorhombic perovskite structures. Both have a relative density of >97%, while La(Co<sub>0.2</sub>Cr<sub>0.2</sub>Ni<sub>0.2</sub>Ga<sub>0.2</sub>Ge<sub>0.2</sub>)O<sub>3</sub> has a significantly larger grain size. Using these materials as electrodes, the cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) results indicate that the working electrode made of La(Co<sub>0.2</sub>Cr<sub>0.2</sub>Ni<sub>0.2</sub>Ga<sub>0.2</sub>Ge<sub>0.2</sub>)O<sub>3</sub> shows higher oxidation reaction activity in CV measurements and achieved a specific capacitance of 74.3 F/g at a current density of 1 A/g in GCD measurements, which still maintained 73% of its initial specific capacitance (54.3 F/g) when the current density was increased to 10 A/g. Its capacitance retention rate is 10 percentage points higher than that of La(Co<sub>0.2</sub>Cr<sub>0.2</sub>Fe<sub>0.2</sub>Mn<sub>0.2</sub>Ni<sub>0.2</sub>)O<sub>3</sub> at high current densities, demonstrating superior rate performance.

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Journal
Materials
Published
2025-08-25
DOI
https://doi.org/10.3390/ma18173966
Primary Topic
High Entropy Alloys Studies
Type
article
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article

Enhanced Rate Capability in B-Site High-Entropy Perovskite Oxide Ceramics: The Case of La(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3

Cheng-Tsung Lu, Changan Tian, Tingting Yao, Hao Ouyang et al.
Materials
High Entropy Alloys Studies
article

Enhanced Rate Capability in B-Site High-Entropy Perovskite Oxide Ceramics: The Case of La(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3

Cheng-Tsung Lu, Changan Tian, Tingting Yao, Hao Ouyang, Zhongli Pan, Liming Fu, B. H. Mok
article en

Abstract

This study employed the solid-state method to prepare perovskite-type high-entropy oxide materials La(Co<sub>0.2</sub>Cr<sub>0.2</sub>Fe<sub>0.2</sub>Mn<sub>0.2</sub>Ni<sub>0.2</sub>)O<sub>3</sub> and La(Co<sub>0.2</sub>Cr<sub>0.2</sub>Ni<sub>0.2</sub>Ga<sub>0.2</sub>Ge<sub>0.2</sub>)O<sub>3</sub> with equimolar ratios at the B-site and explored the effects of sintering temperature on the phase structure and electrochemical properties of high-entropy oxide ceramics. The results show that after sintering at 1300°C, both samples exhibit orthorhombic perovskite structures. Both have a relative density of >97%, while La(Co<sub>0.2</sub>Cr<sub>0.2</sub>Ni<sub>0.2</sub>Ga<sub>0.2</sub>Ge<sub>0.2</sub>)O<sub>3</sub> has a significantly larger grain size. Using these materials as electrodes, the cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) results indicate that the working electrode made of La(Co<sub>0.2</sub>Cr<sub>0.2</sub>Ni<sub>0.2</sub>Ga<sub>0.2</sub>Ge<sub>0.2</sub>)O<sub>3</sub> shows higher oxidation reaction activity in CV measurements and achieved a specific capacitance of 74.3 F/g at a current density of 1 A/g in GCD measurements, which still maintained 73% of its initial specific capacitance (54.3 F/g) when the current density was increased to 10 A/g. Its capacitance retention rate is 10 percentage points higher than that of La(Co<sub>0.2</sub>Cr<sub>0.2</sub>Fe<sub>0.2</sub>Mn<sub>0.2</sub>Ni<sub>0.2</sub>)O<sub>3</sub> at high current densities, demonstrating superior rate performance.

MaterialsVol. 18(17)
Shaoguan University (CN)
Openalex Percentile: Top 78%
High Entropy Alloys Studies
DOIOpen Access PDFOpenAlex
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