期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 10, 期 9, 页码 4817-4824出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta10546a
关键词
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资金
- National Key Research and Development Project from MOST, China [2019YFA0210300]
- National Postdoctoral Program of Innovative Talents [BX20200041]
- Outstanding Talent Fund from BUCT
In this study, a highly active and stable bifunctional electrocatalyst of RuFe@NF was prepared for the hydrogen/oxygen evolution reaction (HER/OER) in water splitting. The catalyst exhibited low voltage and ultra-long stability, surpassing other reported water splitting catalysts, which indicates its potential for large-scale water splitting technology.
Pursuing highly active and stable bifunctional electrocatalysts for the hydrogen/oxygen evolution reaction (HER/OER) is significantly important for overall water splitting. Herein, we prepare an electrocatalyst of ultra-small Ru nanoparticles embedded on Fe-Ni(OH)(2) nanosheets in situ grown on a Ni foam (RuFe@NF) by a one-pot room temperature immersion method. The RuFe@NF only needs an overpotential of 28 mV to attain 10 mA cm(-2) towards the HER and an overpotential of 265 mV to deliver 50 mA cm(-2) for the OER in 1 M KOH solution. When RuFe@NF is used as both the cathode and anode for an overall water splitting electrolytic cell, it exhibits a relatively low cell voltage of 1.54 V to obtain 10 mA cm(-2). Impressively, the RuFe@NF based electrolytic cell exhibits ultra-long stability over 680 hours at 10 mA cm(-2) and even at larger current density up to 100 mA cm(-2), which is obviously superior to the noble Pt/C||IrO2 couple (i.e., 180 mV voltage increase at 50 mA cm(-2) after 36 h), ranking the top among the water splitting catalysts previously reported thus far. The integrated electrode possesses different highly active HER and OER sites and a robust in situ network structure, which collectively improves the electron transport and therefore achieves high activity and stability of the RuFe@NF at an elevated current density. This work offers an alternative bifunctional electrocatalyst, which can be widely extended to large-scale water splitting technology.
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