Carbon quantum dots modified high-entropy oxides for promoting oxygen evolution reaction

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-09-01 DOI:10.1016/j.ceramint.2025.06.196

Yihang Yu , Zenghui Li , Jinhui Sun , Xiaojing Wen , Yanguo Liu , Xiwei Qi , Zhiyuan Wang , Dan Wang

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引用次数: 0

Abstract

High-entropy oxides (HEOs) are promising electrocatalysts for oxygen evolution reaction (OER) because of their huge compositional adjustability, electronic structure controllability, and unique microstructure. The poor electrical conductivity of HEO and the tendency to agglomerate nanocatalysts during the formation process limited the application of HEO in the OER process. Herein, the carbon quantum dots (CQDs) coupled with high entropy oxide (FeCoNiCrMn)₃O₄ (HEO/CQDs) nanomaterials are synthesized by microwave solvothermal methods for high-efficiency OER catalyst. Due to the intervention of the CQDs, the composite electrocatalysts exhibit more uniform nanoparticle dispersion, increased specific surface area, and improved electrical conductivity compared with pure HEOs. The HEO/CQDs-10 with the optimal CQDs load exhibits outstanding OER performance with a low overpotential (258 mV, 10 mA cm⁻²) and low Tafel slope (44.4 mV dec⁻¹) and superior durability. The synergistic effect between the CQDs and the HEOs promotes the evolution of the active transition metal elements' surface electronic structure, thereby facilitating the OER's kinetics. The lattice oxygen-mediated mechanism (LOM) mechanism is verified for the HEO/CQDs OER catalyst. This study provides an effective strategy for synthesizing HEO-derived materials with superior OER performance.

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碳量子点修饰高熵氧化物促进析氧反应

高熵氧化物（HEOs）由于其巨大的成分可调节性、电子结构可控性和独特的微观结构，是很有前途的析氧反应（OER）电催化剂。HEO导电性差，在形成过程中容易聚集纳米催化剂，限制了HEO在OER工艺中的应用。本文采用微波溶剂热法合成了碳量子点（CQDs）与高熵氧化物（FeCoNiCrMn）3O4 （HEO/CQDs）纳米材料，用于高效OER催化剂。由于CQDs的介入，复合电催化剂表现出比纯HEOs更均匀的纳米颗粒分散、更大的比表面积和更高的导电性。具有最佳CQDs负载的HEO/CQDs-10具有较低的过电位（258 mV, 10 mA cm−2）和较低的Tafel斜率（44.4 mV dec−1）以及优异的耐久性能。CQDs和heo之间的协同作用促进了活性过渡金属元素表面电子结构的演化，从而促进了OER的动力学。验证了HEO/CQDs OER催化剂的晶格氧介导机理（LOM）。该研究为合成具有优异OER性能的heo衍生材料提供了有效的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.