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Phosphate-modified cobalt silicate hydroxide with improved oxygen evolution reaction.

Chongtao Ding1, Yao Yu2, Yu Wang1

  • 1State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.

Journal of Colloid and Interface Science
|June 10, 2023
PubMed
Summary
This summary is machine-generated.

Phosphate-incorporated cobalt silicate hydroxide (CoSi-P) shows promise as an efficient, low-cost electrocatalyst for the oxygen evolution reaction (OER). This novel material offers enhanced performance compared to existing catalysts, advancing renewable energy technologies.

Keywords:
Co(3)(Si(2)O(5))(2)(OH)(2) hollow spheresElectrocatalystOxygen evolution reactionPhosphorizationSurface decoration

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Area of Science:

  • Electrochemistry and materials science, focusing on catalysis for renewable energy applications.

Background:

  • The oxygen evolution reaction (OER) is critical for renewable energy systems like water splitting.
  • Developing efficient and affordable OER catalysts is a significant scientific challenge.

Purpose of the Study:

  • To synthesize and evaluate phosphate-incorporated cobalt silicate hydroxide (CoSi-P) as a novel electrocatalyst for OER.
  • To investigate the structural and performance enhancements resulting from phosphate incorporation.

Main Methods:

  • Synthesis of cobalt silicate hydroxide (CoSi) hollow spheres using SiO2 templates via a hydrothermal method.
  • Introduction of phosphate (PO43-) to CoSi, inducing structural reconstruction into sheet-like architectures.
  • Electrochemical characterization to assess OER performance, including overpotential, ECSA, and Tafel slope.

Main Results:

  • The CoSi-P electrocatalyst exhibited a low overpotential of 309 mV at 10 mA·cm−2.
  • CoSi-P demonstrated a large electrochemical active surface area (ECSA) and a low Tafel slope.
  • Performance of CoSi-P surpassed that of CoSi hollow spheres and cobaltous phosphate (CoPO).

Conclusions:

  • Phosphate incorporation significantly enhances the OER performance of cobalt silicate hydroxide.
  • CoSi-P presents a high-efficiency, low-cost, non-noble metal catalyst for OER.
  • This work highlights phosphates' potential in designing advanced transition metal silicate catalysts for energy applications.