Bi-Functional Fe3 O4 /Au/CoFe-LDH Sandwich-Structured Electrocatalyst for Asymmetrical Electrolyzer with Low Operation Voltage.
Fengchao SunYan ZhouZihan YouHanhan XiaYongxiao TuoShutao WangCuiping JiaJun ZhangPublished in: Small (Weinheim an der Bergstrasse, Germany) (2021)
The reduction of the overall electrolysis potential to produce hydrogen is a critical target for fabricating applicable hydrogen evolution cells. Sandwich-structured Fe3 O4 /Au/CoFe-LDH is synthesized via a spontaneous galvanic displacement reaction. A series of structural characterizations indicate the successful synthesis of sandwich-structured Fe3 O4 /Au/CoFe-LDH electrocatalyst. The trace amount of Au laying between Fe3 O4 and CoFe-LDH significantly improves the intrinsic conductivity and catalytic activity of the composite catalyst. In-depth investigations indicate that Fe3 O4 and CoFe-LDH are responsible for the electrocatalytic hydrogen evolution reaction (HER) whereas Au is responsible for the electrocatalytic glucose oxidation (GOR). The electrocatalytic tests indicate Fe3 O4 /Au/CoFe-LDH offers excellent electrocatalytic activity and stability for both HER and GOR, even at high current density (i.e., 1000 mA cm-2 ). Further electrochemistry examinations in a two-compartment cell with a two-electrode configuration show that Fe3 O4 /Au/CoFe-LDH can significantly reduce the overall potential for this asymmetrical cell, with only 0.48 and 0.89 V required to achieve 10 mA cm-2 current density with and without iR-compensation, which is the lowest overall potential requirement ever reported. The design and synthesis of Fe3 O4 /Au/CoFe-LDH pave a new way to electrochemically produce hydrogen and gluconate under extremely low cell voltage, which can readily match with a variety of solar cells.
Keyphrases
- reduced graphene oxide
- sensitive detection
- gold nanoparticles
- visible light
- metal organic framework
- single cell
- cell therapy
- type diabetes
- quantum dots
- solar cells
- risk assessment
- heavy metals
- climate change
- skeletal muscle
- nitric oxide
- insulin resistance
- signaling pathway
- cell proliferation
- carbon nanotubes
- ionic liquid
- room temperature