DataVXACS Applied Materials & InterfacesPaper
journal article·2022-06-08

Electron Tomography Reveals Porosity Degradation Spatially on Individual Pt-Based Nanocatalysts

Weiwei Xia, Mingxing Gong, Chuanyun Wang, Lianyang Chen, Yu Wang, Ran Cai, Zhichao Liu, Mengqian Zhang, Qiubo Zhang, Litao Sun

ACS Applied Materials & Interfaces· Volume 14· Issue 22
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Source abstract

Abstract

Probing porosity evolution is essential to understand the degradation mechanism of electrocatalytic activity. However, spatially dependent degradation pathways for porous catalysts remain elusive. Here, we reveal the multiple degradation behaviors of individual PtCu3 nanocatalysts spatially by three-dimensional (3D) electron tomography. We demonstrate that the surface area–volume ratio (SVR) of cycled porous particles decreases linearly rather than reciprocally with particle size. Additionally, an improved SVR (about 3-fold enhancement) results in increased oxygen reduction reaction (ORR) efficiency at the early stage. However, in the subsequent cycles, the degradation of catalytic activity is due to the excessive growth of pores, the reduction of reaction sites, and the chemical segregation of Cu atoms. The spatial porosity evolution model of nanocatalysts is applicable for a wide range of catalytic reactions, providing a critical insight into the degradation of catalyst activity.
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Research context

NanomaterialsCatalysis & surfaces

OpenAlex topics: Electrocatalysts for Energy Conversion · Nanoporous metals and alloys · Advanced Electron Microscopy Techniques and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shaanxi Materials Analysis and Research Center, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710000, China

Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China

School of Aeronautics, Northwestern Polytechnical University, Xi’an 710000, China

Beijing Advanced Innovation Center for Intelligent Robots and Systems and Institute of Engineering Medicine, Beijing Institute of Technology, Beijing 100081, China

SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096, China

Funding

China Postdoctoral Science Foundation · Central University Basic Research Fund of China · National Natural Science Foundation of China

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