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NiFe-layered double hydroxide/CoP2@MnP heterostructures of clustered flower nanowires on MXene-modified nickel foam for overall water-splitting.
- Source :
-
Journal of Colloid & Interface Science . Dec2023, Vol. 651, p1054-1069. 16p. - Publication Year :
- 2023
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Abstract
- [Display omitted] • A simple and effective method for the synthesis of 3D heterogeneous structures. • The synergistic effect between the components improves the activity of the material. • The catalyst depicts exceptional performance in all three reactions of OER, HER, and overall water splitting. • The electrocatalytic mechanism of HER and OER was studied by DET calculation. Exploiting efficient and economical electrocatalysts is indispensable to promoting the sluggish kinetics of overall water-splitting. Herein, we designed a phosphate reaction and two-step hydrothermal method to construct a 3D porous clustered flower-like heterogeneous structure of NiFe-layered double hydroxide (NiFe) and CoP 2 @MnP (CMP) grown in-situ on MXene-modified nickel foam (NF) substrate (denoted as NiFe/CMP/MX), with favorable kinetics. Density functional theory calculations (DFT) demonstrate that the self-driven transfer of heterojunction charges causes electron redistribution of the catalyst, and optimizes the electron transfer rate of the active site and the d-band center near the Fermi level, thereby reducing the adsorption energy of H and O reaction intermediates (H*, OH*, OOH*). As expected, the combination of CMP and NiFe with naturally conductive MXene forms a strong chemical and electron synergistic effect, which enables the synthesized NiFe/CMP/MX heterogeneous structure exhibits good activity for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) with a low overpotential of 200 mV and 126 mV at 10 mA cm−2, respectively. Furthermore, the overpotential of 1.58 V is enough to drive a current density of 10 mA cm−2 in a two-electrode configuration, which is better than noble metals (RuO 2 (+)//Pt/C(−)) (1.68 V). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219797
- Volume :
- 651
- Database :
- Academic Search Index
- Journal :
- Journal of Colloid & Interface Science
- Publication Type :
- Academic Journal
- Accession number :
- 171992087
- Full Text :
- https://doi.org/10.1016/j.jcis.2023.07.019