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Related Concept Videos

Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Related Experiment Video

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In Situ Bismuth Exsolution-Driven Controllable Bi/Bi4Ti3O12 Heterointerface Catalysts for Enhanced Photocatalytic

Guojun Li1, Zhen Chen1, Yunlong Wang1

  • 1State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, P.R. China.

Angewandte Chemie (International Ed. in English)
|February 16, 2026
PubMed
Summary

Engineered bismuth nanoparticles on bismuth titanate create strong built-in electric fields (BIEF), boosting photocatalytic CO2 reduction to formic acid. This breakthrough enhances charge transfer and CO2 activation for efficient catalysis.

Keywords:
Bi/BTOVsbuilt‐in electric‐fieldheterointerface engineeringin situ exsolutionphotocatalytic CO2 to HCOOH

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Chemical Engineering

Background:

  • Heterointerface engineering using built-in electric fields (BIEF) is key for efficient photocatalytic CO2 reduction.
  • Creating strongly coupled heterointerfaces to maximize BIEF effects is a significant challenge.

Purpose of the Study:

  • To develop a novel strategy for constructing strongly coupled heterointerfaces with enhanced BIEF.
  • To investigate the relationship between BIEF intensity and nanoparticle size in photocatalytic CO2 reduction.
  • To optimize photocatalyst design for efficient and selective conversion of CO2 to formic acid.

Main Methods:

  • An off-equilibrium solvothermal strategy was used to exsolve bismuth (Bi) nanoparticles from Bi4Ti3O12 (BTOVs).
  • Experimental and theoretical analyses were employed to study BIEF intensity, charge transfer, and electronic structure.
  • The photocatalytic performance was evaluated by measuring formic acid yield and selectivity.

Main Results:

  • A homologous Bi/Bi4Ti3O12 (Bi/BTOVs) heterointerface catalyst was successfully synthesized.
  • A volcano-type relationship was observed between BIEF intensity and Bi nanoparticle size.
  • The optimized catalyst exhibited a high HCOOH yield of 4126.25 µmol·g-1·h-1 with near-unity selectivity.
  • Localized photothermal effects from Bi nanoparticles accelerated CO2 reaction kinetics.

Conclusions:

  • The study presents a generalizable strategy for designing BIEF-based heterointerfaces for photocatalytic CO2 reduction.
  • Optimized BIEF strengthens interfacial charge transfer and CO2 activation, enhancing formic acid production.
  • The findings offer a transferable design principle for advanced photocatalyst development.