具有增强ORR性能的单原子铁氮电催化剂的石墨烯量子点锚定策略合成

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Functional Materials Letters Pub Date : 2023-10-17 DOI:10.1142/s1793604723400313

Huinian Zhang, Suping Jia, Ning Li, Xiaolin Shi, Ziyuan Li

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引用次数: 0

摘要

单原子催化剂(SACs)，尤其是原子分散的Fe-N -C基SACs，在氧还原反应(ORR)中有望取代pt基电催化剂。目前，具有原子分散Fe-N[公式:见本文]位结构的高活性ORR电催化剂由于其表面自由能高，容易迁移，聚集严重，仍然具有挑战性。在此，我们设计了一种通用石墨烯量子点(GQDs)锚定策略，通过煅烧N-GQDs-Fe修饰的多孔碳(PC)和三聚氰胺来合成一种应用于ORR的单铁原子电催化剂(Fe-N-GQDs /PC)。实验表明，N-GQDs含有丰富的氧合基团，可以使金属离子络合，从而促进SACs的形成。此外，Fe-N-GQDs /PC电催化剂在0.1 M KOH介质中表现出出色的电催化ORR活性，Pt/C的半波电位为0.84 V，而Pt/C的半波电位为0.85 V。这一策略为生产电化学能源装置用sac开辟了新的可行思路。

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Facile graphene quantum dot-anchoring strategy synthesis of single-atom iron-nitrogen electrocatalyst with enhanced ORR performance

Single-atom catalysts (SACs), especially atomically dispersed Fe–N[Formula: see text]–C based SACs, hold great promise to replace Pt-based electrocatalysts for oxygen-reduction reaction (ORR). Currently, synthesizing high-activity ORR electrocatalysts with atomically dispersed Fe–N[Formula: see text] site structures is still challenging due to their high surface free energy, which leads to easy migration and serious aggregation. Herein, we have designed a general graphene quantum dots (GQDs)-anchoring strategy to synthesize a single-iron-atom electrocatalyst (Fe–N-GQDs/PC) applied to ORR through calcining of N-GQDs-Fe[Formula: see text] modified porous carbon (PC) and melamine. Experiments demonstrate the N-GQDs consist of abundant oxygenated groups, which could lead to complexing metal ions and thus facilitating the formation of SACs. Furthermore, the Fe–N-GQDs/PC electrocatalyst exhibits outstanding electrocatalytic ORR activity in 0.1 M KOH media with half-wave potentials of 0.84 versus 0.85 V for Pt/C. This strategy has opened up new feasible ideas to produce SACs for electrochemical energy devices.

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来源期刊

Functional Materials Letters 工程技术-材料科学：综合

CiteScore

2.40

自引率

7.70%

发文量

审稿时长

1.9 months

期刊介绍： Functional Materials Letters is an international peer-reviewed scientific journal for original contributions to research on the synthesis, behavior and characterization of functional materials. The journal seeks to provide a rapid forum for the communication of novel research of high quality and with an interdisciplinary flavor. The journal is an ideal forum for communication amongst materials scientists and engineers, chemists and chemical engineers, and physicists in the dynamic fields associated with functional materials. Functional materials are designed to make use of their natural or engineered functionalities to respond to changes in electrical and magnetic fields, physical and chemical environment, etc. These design considerations are fundamentally different to those relevant for structural materials and are the focus of this journal. Functional materials play an increasingly important role in the development of the field of materials science and engineering. The scope of the journal covers theoretical and experimental studies of functional materials, characterization and new applications-related research on functional materials in macro-, micro- and nano-scale science and engineering. Among the topics covered are ferroelectric, multiferroic, ferromagnetic, magneto-optical, optoelectric, thermoelectric, energy conversion and energy storage, sustainable energy and shape memory materials.