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Free-energy diagrams, or reaction coordinate diagrams, are graphs showing the energy changes that occur during a chemical reaction. The reaction coordinate represented on the horizontal axis shows how far the reaction has progressed structurally. Positions along the x-axis close to the reactants have structures resembling the reactants, while positions close to the products resemble the products.  Peaks on the energy diagram represent stable structures with measurable lifetimes, while...
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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Related Experiment Video

Updated: Jan 7, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Engineering an Ordered Intermediate Phase between Disordered Phases for CO2 Reduction to Multicarbon Products.

Xuan Zheng1, Yi Lu2, Jingwen Hu1

  • 1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, P. R. China.

ACS Nano
|December 29, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed an ordered gold-copper alloy (Au1Cu1) for efficient electrochemical carbon dioxide reduction (CO2RR) to valuable multicarbon products. This breakthrough enhances carbon recycling and sustainable energy by overcoming challenges in C-C bond formation.

Keywords:
CO2 reductionbimetallic alloyintermetallic compoundslong-range orderingmulticarbon products

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Electrochemical CO2 reduction (CO2RR) to multicarbon (C2) products is key for carbon recycling but faces challenges in C2 selectivity due to C1 product preference and difficult C-C bond formation.
  • Bimetallic alloys offer tunable catalysis, but random atomic arrangements limit control over active sites and C1/C2 selectivity.

Purpose of the Study:

  • To develop a strategy for synthesizing ordered bimetallic alloys for enhanced CO2RR.
  • To investigate the effect of atomic ordering on C2 product selectivity in CO2RR.

Main Methods:

  • Composition-dependent phase engineering using a polymer nanofiber-mediated approach to synthesize ordered Au1Cu1 and disordered Au3Cu1, Au1Cu3 alloys.
  • Electrochemical performance testing, including Faradaic efficiency measurements.
  • In situ characterizations and theoretical calculations to analyze active site configurations and reaction mechanisms.

Main Results:

  • Ordered Au1Cu1 alloy exhibited optimized d-band center and balanced intermediate binding, favoring C-C coupling over C1 formation.
  • The Au1Cu1/CNFs catalyst achieved a peak Faradaic efficiency of 55.6% for C2 products at -0.5 V vs RHE.
  • Electronic and geometric configurations of Au1Cu1 facilitate the lowest energy barrier for *CHO-*CO coupling.

Conclusions:

  • Precise atomic-level control in bimetallic alloy ordering is demonstrated as a viable strategy for CO2RR.
  • The ordered Au1Cu1 intermetallic alloy effectively guides CO2RR toward valuable multicarbon products, advancing carbon recycling technologies.