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Catalysis02:50

Catalysis

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Spontaneous Chemical Reactions
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Liquid Metal Dynamic Interface Enabled Reverse Hydrogen Spillover Boosting Electrocatalytic Nitrate Reduction.

Wenda Chen1, Wei Zeng2, Zanyu Chen1

  • 1School of Materials Science and Engineering, State Key Laboratory of Precious Metal Functional Materials, Tianjin University, Tianjin, 300350, P.R. China.

Angewandte Chemie (International Ed. in English)
|October 29, 2025
PubMed
Summary
This summary is machine-generated.

A novel liquid metal catalyst, Co@Ga, reverses hydrogen spillover for efficient electrochemical nitrate reduction to ammonia. This breakthrough enhances ammonia synthesis rates and stability, offering a new strategy for complex electrocatalysis.

Keywords:
AmmoniaGalliumLiquid metalNitrate reductionReverse hydrogen spillover

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Electrochemical nitrate reduction (NO3-RR) to ammonia is vital but hindered by complex proton-coupled electron transfer (PCET) pathways.
  • Efficient regulation of active hydrogen (H*) flux is critical for improving NO3-RR efficiency.

Purpose of the Study:

  • To develop a novel liquid metal-based catalyst for enhanced electrochemical nitrate reduction.
  • To investigate a reverse hydrogen spillover mechanism for improved catalytic performance.

Main Methods:

  • Fabrication of a Co@Ga liquid metal catalyst with a dynamic liquid Ga core-solid Co shell interface.
  • Operando characterization to study the catalyst's behavior under reaction conditions.
  • Electrochemical measurements to evaluate ammonia yield rate, Faraday efficiency, and stability.

Main Results:

  • The Co@Ga catalyst demonstrated an unprecedented reverse hydrogen spillover mechanism.
  • Achieved an ultra-high ammonia yield rate of 51 mol h-1 gCo-1 and a Faraday efficiency of 94.5% at -0.3 V versus RHE.
  • Exhibited outstanding stability over 400 hours at 1 A cm-2.

Conclusions:

  • The dynamic liquid-solid-liquid interface of Co@Ga enables efficient regulation of H* flux via reverse hydrogen spillover.
  • This strategy significantly boosts electrochemical nitrate reduction to ammonia, offering a universal approach for complex electrocatalytic reactions.