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Lewis Acids and Bases

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In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
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Lewis Symbols and the Octet Rule

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Updated: Jun 5, 2025

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

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Published on: August 17, 2019

Lewis Acid Sites Assisted PtCu/CeO₂-C Enabling High-Performance for Oxygen Reduction.

Yangyang Ren¹, Beibei Li¹, Guichao Zhang¹

¹School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.

Small (Weinheim an Der Bergstrasse, Germany)

|December 11, 2024

Summary

This summary is machine-generated.

This study presents a new platinum-copper alloy catalyst supported by cerium dioxide (PtCu/CeO2-C) for the oxygen reduction reaction (ORR). This advanced catalyst demonstrates significantly enhanced durability and activity, crucial for clean energy applications.

Keywords:

lewis acid sites metal oxides support metal‐support interaction oxygen reduction reaction platinum

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Developing durable and active low-platinum (Pt) nanocatalysts is crucial for advancing clean energy technologies.
The oxygen reduction reaction (ORR) is a key process in fuel cells, requiring efficient catalysts.

Purpose of the Study:

To develop an efficient cerium dioxide (CeO2) supported platinum-copper (PtCu) alloy catalyst (PtCu/CeO2-C) for ORR in acidic media.
To investigate the role of CeO2 support in enhancing catalyst stability and activity.

Main Methods:

Synthesis of PtCu/CeO2-C nanocatalyst.
Electrochemical characterization including specific and mass activity measurements at 0.9 V.
Theoretical studies to understand the catalytic mechanism, focusing on oxygen vacancies (VO).

Main Results:

PtCu/CeO2-C exhibited significantly higher specific activity (9.9 times) and mass activity (6.1 times) compared to commercial Pt/C.
The CeO2 support effectively anchored PtCu particles, preventing migration and enhancing long-term stability.
Theoretical analysis confirmed that oxygen vacancies on CeO2 facilitate O2 adsorption/dissociation and optimize Pt electronic structure for an efficient 4-electron ORR pathway.

Conclusions:

The rational design of supported Pt-based catalysts, utilizing materials like CeO2, is highly effective for improving ORR efficiency.
PtCu/CeO2-C represents a promising catalyst for clean energy applications due to its superior activity and durability.
Understanding the role of support materials and defects, such as oxygen vacancies, is key to designing next-generation electrocatalysts.