Flexible and Binder-Free Iron Phosphide Electrodes Using a Three-Dimensional Support for High Hydrogen Productivity
CHEMELECTROCHEM(2023)
摘要
In this work, an inexpensive and reliable microstructured electrode for the hydrogen evolution reaction (HER) is developed. This cathode is made of Earth-abundant elements consisting of iron phosphide as an electrocatalyst and carbon felt (CF) as a flexible conductive scaffold. Its porous character and binder-free FeP coverage over the carbon fibers generate a high number of accessible active sites for the reaction, achieving a high value of the electrochemically active surface area. The electrode reaches 100 mA center dot cm(-2) by applying only 53 mV vs RHE at 50 degrees C in 0.5 M H2SO4, demonstrating excellent electrocatalytic activity for the HER and outstanding stability in acidic electrolyte. Furthermore, the feasibility of these electrodes for industrial application is evaluated using a PEM electrolyzer. The developed prototype with a cathodic area of 1.8 cm(2) shows a very promising performance, reaching 14.9 mmol H-2 center dot h(-1) center dot cm(-2) (corresponding to 800 mA center dot cm(-2)) at a voltage of only 2.1 V.
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关键词
high hydrogen productivity,electrodes
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