In:
Dalton Transactions, Royal Society of Chemistry (RSC), Vol. 50, No. 46 ( 2021), p. 17265-17274
Kurzfassung:
Electrochemical water splitting is convinced as one of the most promising solutions to combat the energy crisis. The exploitation of efficient hydrogen and oxygen evolution reaction (HER/OER) bifunctional electrocatalysts is undoubtedly a vital spark yet challenging for imperative green sustainable energy. Herein, through introducing a simple pH regulated redox reaction into a tractable hydrothermal procedure, a hierarchical Fe 3 O 4 @MnO x binary metal oxide core–shell nano-polyhedron was designed by evolving MnO x wrapped Fe 3 O 4 . The MnO x effectively prevents the agglomeration and surface oxidation of Fe 3 O 4 nano-particles and increases the electrochemically active sites. Benefiting from the generous active sites and synergistic effects of Fe 3 O 4 and MnO x , the Fe 3 O 4 @MnO x -NF nanocomposite implements efficient HER/OER bifunctional electrocatalytic performance and overall water splitting. As a result, hierarchical Fe 3 O 4 @MnO x only requires a low HER/OER overpotential of 242/188 mV to deliver 10 mA cm −2 , a small Tafel slope of 116.4/77.6 mV dec −1 , combining a long-term cyclability of 5 h. Impressively, by applying Fe 3 O 4 @MnO x as an independent cathode and anode, the overall water splitting cell supplies a competitive voltage of 1.64 V to achieve 10 mA cm −2 and super long cyclability of 80 h. These results reveal that this material is a promising candidate for practical water electrolysis application.
Materialart:
Online-Ressource
ISSN:
1477-9226
,
1477-9234
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2021
ZDB Id:
1472887-4
