与碳纳米管互连的超小型铁纳米团簇碳多面体用于高性能锌-空气电池

IF 3.6 4区工程技术 Q3 ENERGY & FUELS

Energy technology Pub Date : 2024-09-18 DOI:10.1002/ente.202401339

Haihua Wu, Feng Wu, Juanjuan Zhai, Yudan Li, Xin Xu, Yunfang Gao

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引用次数: 0

摘要

金属催化剂的催化活性与其颗粒大小密切相关。然而，电催化氧还原反应（ORR）是金属-空气电池和燃料电池的一个重要反应，其粒度效应尚未得到明确研究。本文采用两步锚定法控制铁催化剂的纳米颗粒（NPs）、超小型纳米团簇（NCTs）、孤立原子以及由碳纳米管（CNTs）互连的碳多面体稳定和分散的形式。与铁 NPs、孤立的铁原子和商用 Pt/C 相比，均匀分布的铁 NCT 具有更优越的 ORR 性能。铁 NCTs 独特的电子结构和丰富的边角活性位点使其具有出色的 ORR 活性。由于碳多面体的多孔结构和 CNT 的高电子传导性，Fe NCTs 在锌-空气电池中也具有出色的放电性能，峰值功率密度高达 213.3 mW cm-2，并且长期稳定。这些发现为设计应用于各种催化反应的金属 NCTs 催化剂开辟了新策略。

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Ultrasmall Fe‐Nanoclusters‐Anchored Carbon Polyhedrons Interconnected with Carbon Nanotubes for High‐Performance Zinc‐Air Batteries

The catalytic activity of metal catalyst is closely related to its particle size. Yet, the size effect in electrocatalytic oxygen reduction reaction (ORR), an important reaction for metal‐air batteries and fuel cells, has not been clearly studied. Herein, a two‐step anchoring method is utilized to control the Fe catalyst in forms of nanoparticles (NPs), ultrasmall nanoclusters (NCTs), and isolated atoms as well as stabilized and dispersed by carbon polyhedrons interconnected with carbon nanotubes (CNTs). The uniformly distributed Fe NCTs displays superior ORR performance compared with Fe NPs, isolated Fe atoms, and commercial Pt/C. The brilliant ORR activity of Fe NCTs is a result of its unique electron structure and abundant edge and corner active sites. Due to the porous structure of carbon polyhedrons and high electron conductivity of CNTs, Fe NCTs also delivers an excellent discharge performance in zinc‐air battery with a peak power density of 213.3 mW cm−2 and long‐term stability. In these findings, a new strategy for the design of metal NCTs catalysts applied in various catalytic reactions is opened up.

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来源期刊

Energy technology ENERGY & FUELS-

CiteScore

7.00

自引率

5.30%

发文量

审稿时长

1.3 months

期刊介绍： Energy Technology provides a forum for researchers and engineers from all relevant disciplines concerned with the generation, conversion, storage, and distribution of energy. This new journal shall publish articles covering all technical aspects of energy process engineering from different perspectives, e.g., new concepts of energy generation and conversion; design, operation, control, and optimization of processes for energy generation (e.g., carbon capture) and conversion of energy carriers; improvement of existing processes; combination of single components to systems for energy generation; design of systems for energy storage; production processes of fuels, e.g., hydrogen, electricity, petroleum, biobased fuels; concepts and design of devices for energy distribution.