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Published on: August 17, 2019
Near-100% C1-Pathway Selective Ethanol Oxidation on Turing-Type Pd-Based Crystalline/Amorphous Heterointerfaces
Genlei Zhang1, Hao Cheng1, Shuaipeng Liu1
1Anhui Province Key Laboratory of Value-Added Catalytic Conversion and Reaction Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|July 24, 2026
Summary
Researchers developed a novel catalyst for direct ethanol fuel cells, achieving 97.1% C1 pathway selectivity for ethanol oxidation reaction (EOR). This breakthrough enhances fuel cell efficiency by optimizing the reaction pathway.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Direct ethanol fuel cells (DEFCs) face efficiency limitations due to the ethanol oxidation reaction (EOR) favoring the C2 pathway over the desired C1 pathway.
- Developing catalysts that promote C1 selectivity is crucial for advancing DEFC technology.
Purpose of the Study:
- To design and synthesize a novel catalyst that achieves high C1 pathway selectivity for alkaline EOR.
- To elucidate the catalytic mechanism responsible for enhanced C1 selectivity.
Main Methods:
- Fabrication of a Pd-based crystalline/amorphous (C/A) heterointerface catalyst using a carbon engineering strategy with salt-melt templating and annealing.
- Characterization using atomic-resolution microscopy.
- Electrochemical evaluation including in situ FTIR and HPLC.
- Computational analysis using Density Functional Theory (DFT).
Main Results:
- Achieved a record C1 pathway selectivity of 97.1% for alkaline EOR.
- The catalyst features an ultrathin Turing-type nanonet with strained interstitial-carbon-doped PdO (Cint-PdO) and defective amorphous PdCx (a-PdCx).
- In situ FTIR confirmed CO2 production at low overpotentials, and HPLC verified high C1 selectivity.
- DFT revealed a dual-cooperative mechanism involving Cint-PdO and a-PdCx for efficient ethanol oxidation.
Conclusions:
- The developed carbon-engineered C/A heterointerface catalyst effectively suppresses the C2 pathway and promotes the C1 pathway in EOR.
- This catalyst design represents a significant advancement in overcoming the selectivity bottleneck for direct ethanol fuel cells.
- The findings establish carbon-engineered heterointerfaces as a promising strategy for designing high-performance electrocatalysts.
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