A highly efficient electrochemical oxygen evolution reaction catalyst constructed from a S-treated two-dimensional
Jinlei Wang1, Meilin Zhang2, Jinhui Li2
1School of Chemical Engineering and Technology, North University of China, Taiyuan, Shanxi 030051, China and State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China. gyq@nuc.edu.cn.
Dalton Transactions (Cambridge, England : 2003)
|October 8, 2020
Summary
A novel sulfur-treated cobalt-iron bimetallic Prussian blue analogue (PBA) on carbon fiber paper (CFP) shows excellent oxygen evolution reaction (OER) electrocatalysis. This material offers a new pathway for designing efficient porous coordination polymer (PCP)-based catalysts.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Porous coordination polymers (PCPs), including metal-organic frameworks (MOFs) and Prussian blue analogues (PBAs), are desirable for electrocatalysis.
- Maintaining the intrinsic characteristics of PCPs during electrocatalysis is crucial, avoiding high-temperature calcination.
- Developing efficient electrocatalysts for the oxygen evolution reaction (OER) is vital for energy conversion technologies.
Purpose of the Study:
- To develop a highly efficient oxygen evolution reaction (OER) electrocatalyst based on a porous coordination polymer.
- To investigate the effect of sulfur treatment on the structure and electrocatalytic performance of a CoFe bimetallic PBA.
- To explore a new strategy for designing advanced PCP-based electrocatalysts without high-temperature conversion.
Main Methods:
- Synthesis of a two-dimensional (2D) CoFe bimetallic PBA grown on carbon fiber paper (CFP).
- Sulfur treatment of the CoFe PBA to create S-CoFe-PBA/CFP.
- Electrocatalytic testing for the oxygen evolution reaction (OER) in 1 M KOH.
- Characterization of the catalyst's structure and surface properties.
Main Results:
- The S-CoFe-PBA/CFP exhibited significantly enhanced OER catalytic activity.
- Low overpotentials of 235, 259, and 272 mV were required for current densities of 10, 50, and 100 mA cm-2, respectively.
- A low Tafel slope of 35.2 mV dec-1 and a 6.4 times higher current density compared to commercial Ir/C were achieved.
- Sulfur treatment facilitated H+ capture and in situ formation of amorphous CoSx nanogauze, improving charge transfer and intermediate adsorption.
Conclusions:
- The S-treated CoFe PBA/CFP is a highly efficient electrocatalyst for the oxygen evolution reaction.
- Sulfur treatment enhances OER performance by modifying surface chemistry and electronic interactions.
- This approach offers a promising new avenue for designing high-performance PCP-based electrocatalysts.
