包埋在富N MOF衍生结构中的Pd纳米颗粒用于碱性介质中的有效氧还原反应

IF 10.7 1区 工程技术 Q1 CHEMISTRY, PHYSICAL
Daqiang Yan, Lin Zhang, Lei Shen, Runyu Hu, Weiping Xiao, Xiaofei Yang
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引用次数: 3

摘要

开发用于氧还原反应(ORR)的高效钯基电催化剂对于碱性膜燃料电池来说仍然是具有挑战性的,因为其具有强的氧吸附能和容易团聚的固有性质。为了同时解决这些问题,设计了具有多孔结构的Pd/Co3O4–N–C多维材料作为ORR催化剂。详细地说,首先合成了具有多面体结构的ZIF-67,然后在高温下退火以制备N掺杂的Co3O4碳基材料,该材料用于均匀地限制Pd纳米颗粒,并获得了Pd/Co3O4–N–C系列催化剂。Co–N和C–N键的形成可以为ORR提供有效的活性位点。同时,Pd和N掺杂的Co3O4之间界面的强电子相互作用可以分散和避免Pd纳米颗粒的团聚,并确保活性位点的暴露,这对于降低ORR的能垒和显著增强ORR动力学至关重要。因此,与Co3O4–N–C和Pd/C相比,Pd/Co3O4–N–C纳米化合物在0.1 mol L−1 KOH溶液中表现出优异的ORR催化性能、理想的Pd质量活性和耐久性。可扩展的合成方法、相对较低的成本和优异的电化学ORR性能表明,所获得的Pd/Co3O4–N–C电催化剂具有在燃料电池上应用的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Pd nanoparticles embedded in N-Enriched MOF-Derived architectures for efficient oxygen reduction reaction in alkaline media

Pd nanoparticles embedded in N-Enriched MOF-Derived architectures for efficient oxygen reduction reaction in alkaline media

Developing high efficient Pd-based electrocatalysts for oxygen reduction reaction (ORR) is still challenging for alkaline membrane fuel cell, since the strong oxygen adsorption energy and easy agglomerative intrinsic properties. In order to simultaneously solve these problems, Pd/Co3O4–N–C multidimensional materials with porous structures is designed as the ORR catalysts. In details, the ZIF-67 with polyhedral structure was firstly synthesized and then annealed at high-temperature to prepare the N-doped Co3O4 carbon-based material, which was used to homogeneously confine Pd nanoparticles and obtained the Pd/Co3O4–N–C series catalysts. The formation of Co–N and C–N bond could provide efficient active sites for ORR. Simultaneously, the strong electronic interaction in the interface between the Pd and N-doped Co3O4 could disperse and avoid the agglomeration of Pd nanoparticles and ensure the exposure of active sites, which is crucial to lower the energy barrier toward ORR and substantially enhance the ORR kinetics. Hence, the Pd/Co3O4–N–C nanocompounds exhibited excellent ORR catalytic performance, ideal Pd mass activity, and durability in 0.1 mol L−1 KOH solution compared with Co3O4–N–C and Pd/C. The scalable synthesis method, relatively low cost, and excellent electrochemical ORR performance indicated that the obtained Pd/Co3O4–N–C electrocatalyst had the potential for application on fuel cells.

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来源期刊
Green Energy & Environment
Green Energy & Environment Energy-Renewable Energy, Sustainability and the Environment
CiteScore
16.80
自引率
3.80%
发文量
332
审稿时长
12 days
期刊介绍: Green Energy & Environment (GEE) is an internationally recognized journal that undergoes a rigorous peer-review process. It focuses on interdisciplinary research related to green energy and the environment, covering a wide range of topics including biofuel and bioenergy, energy storage and networks, catalysis for sustainable processes, and materials for energy and the environment. GEE has a broad scope and encourages the submission of original and innovative research in both fundamental and engineering fields. Additionally, GEE serves as a platform for discussions, summaries, reviews, and previews of the impact of green energy on the eco-environment.
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