Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202009245
Keywords
co‐ based hydroxide; in situ intercalation; iron incorporation; oxygen evolution reaction; vacancy
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Funding
- National Key R&D Program of China [SQ2020YFA0710000]
- National Natural Science Foundation of China [21902047, 51402100, 21825201, 21573066, 21805080]
- Provincial Natural Science Foundation of Hunan [2020JJ5045]
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In this study, Co80Fe20(OH)(OCH3) electrocatalyst with intercalation and rich vacancies was synthesized through a one-step solvothermal reaction, resulting in a significantly increased specific surface area and a reduced overpotential, showing higher electrocatalytic performance.
The efficiency of water splitting is largely hindered by the sluggish kinetics of the oxygen evolution reaction. Cobalt-based (oxy)hydroxides are promising electrocatalysts, but their performance is still under the expected goal due to the restricted active sites and intrinsic activity. Herein, Co80Fe20(OH)(OCH3) (CoFeMe) is synthesized with intercalation and rich vacancies by a cation exsolution process in a one-step solve-thermal reaction. With the help of the Fe incorporation, the specific surface area of CoFeMe increases to 101.6 m(2) g(-1), which is six times that of Co(OH)(OCH3) (CoMe) (16.5 m(2) g(-1)). Also, the induced rich vacancies are traced in the X-ray absorption spectra of CoFeMe. Because of the synergistic effect between the intercalation, Fe incorporation and vacancies, the overpotential of CoFeMe is only 240 mV to drive the current density to 10 mA cm(-2), which is reduced 110 mV compared with that of pristine CoMe (350 mV).
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