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Volume 18
Issue 17
10.3390/ma18173966
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Communication

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

by
Boon-How Mok
*,
Tengfa Yao
,
Longchao Fu
,
Cheng-Tsung Lu
,
Haoxian Ouyang
,
Zongying Pan
and
Changan Tian
*
School of Chemistry and Civil Engineering, Shaoguan University, Shaoguan 512005, China
*
Authors to whom correspondence should be addressed.
Materials 2025, 18(17), 3966; https://doi.org/10.3390/ma18173966
Submission received: 4 July 2025 / Revised: 3 August 2025 / Accepted: 22 August 2025 / Published: 25 August 2025
(This article belongs to the Special Issue Electrochemical Materials and Devices for Energy Conversion and Storage—2nd Edition)
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Highlights

  1. The solid-state method was used to prepare two equimolar B-site perovskite high-entropy oxides.
  2. Both samples sintered at 1300 °C show an orthorhombic structure with >97% relative density; one has larger grains.
  3. The La(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3 electrode exhibits higher oxidation activity in CV.
  4. It achieves better rate performance in GCD (10% higher retention).

Abstract

This study employed the solid-state method to prepare perovskite-type high-entropy oxide materials La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 and La(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3 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(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3 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(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3 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(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 at high current densities, demonstrating superior rate performance.
Keywords: high-entropy oxides; perovskite; specific capacity; electrochemical property high-entropy oxides; perovskite; specific capacity; electrochemical property

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MDPI and ACS Style

Mok, B.-H.; Yao, T.; Fu, L.; Lu, C.-T.; Ouyang, H.; Pan, Z.; Tian, C. Enhanced Rate Capability in B-Site High-Entropy Perovskite Oxide Ceramics: The Case of La(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3. Materials 2025, 18, 3966. https://doi.org/10.3390/ma18173966

AMA Style

Mok B-H, Yao T, Fu L, Lu C-T, Ouyang H, Pan Z, Tian C. Enhanced Rate Capability in B-Site High-Entropy Perovskite Oxide Ceramics: The Case of La(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3. Materials. 2025; 18(17):3966. https://doi.org/10.3390/ma18173966

Chicago/Turabian Style

Mok, Boon-How, Tengfa Yao, Longchao Fu, Cheng-Tsung Lu, Haoxian Ouyang, Zongying Pan, and Changan Tian. 2025. "Enhanced Rate Capability in B-Site High-Entropy Perovskite Oxide Ceramics: The Case of La(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3" Materials 18, no. 17: 3966. https://doi.org/10.3390/ma18173966

APA Style

Mok, B.-H., Yao, T., Fu, L., Lu, C.-T., Ouyang, H., Pan, Z., & Tian, C. (2025). Enhanced Rate Capability in B-Site High-Entropy Perovskite Oxide Ceramics: The Case of La(Co0.2Cr0.2Ni0.2Ga0.2Ge0.2)O3. Materials, 18(17), 3966. https://doi.org/10.3390/ma18173966

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