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Updated: Sep 11, 2025
Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
Published on: January 17, 2020
Cavity-confined Au@Cu2O yolk-shell nanoreactors enable switchable CH4/C2H4 selectivity
Zekun Zhang1, Hua Guo2, Shiji Li1
1Department of Environmental Science and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
None:
The regulation of product selectivity in electrochemical CO2 reduction (ECO2R) remains fundamentally constrained by the dynamic equilibrium between intermediate transport and surface coverage. In this study, we report a progress in catalytic architecture through precision-engineered Au@Cu2O yolk-shell tandem nanoreactors featuring dual-tunable parameters: cavity confinement dimensions and shell thickness gradients. This structural modulation enables dynamic control over both *CO intermediate enrichment and reaction pathway bifurcation. ECO2R performance evaluations demonstrate significant product selectivity switching at -1.31 V (vs. reversible hydrogen electrode (RHE)). The Faradaic efficiency (FE) for CH4 exhibits significant architectural dependence, increasing from 43.02% (thick-shell/large-cavity) to 65.54% (medium-dimension) and then decreasing to 23.26% (thin-shell/small-cavity). Conversely, the FE for C2H4 demonstrates an inverse structural correlation, improving from 6.68% (medium-dimension) to 38.73% (thin-shell/small-cavity). The spatial domain-limiting mechanism of the yolk-shell structure directly controls the transition between protonation-dominated CH4 formation and coupling-driven C2H4 production. This work establishes a pioneering paradigm for dynamically steering catalytic selectivity through purely geometrical modulation, bypassing traditional compositional tuning limitations, thereby opening avenues for precision design of advanced electrocatalytic systems.
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