Controllable construction of bifunctional sites on Ir@Ni/NiO core/shell porous nanorod arrays for efficient water splitting

Dandan Li, Lei Ding, Qiang Zhao, Feng Yang and Sihang Zhang

Applied Energy, 2024, vol. 356, issue C, No S0306261923017336

Abstract: Ir-modified Ni/NiO core/shell porous nanorod arrays (Ir@Ni/NiO PNAs) are constructed for efficient alkaline full water splitting via a simple and controllable electro-etching process, where the introduced Ir tunes electronic structure of NiO and builds unique bifunctional Ir-Ni3+ catalytic sites. Specially, the high current density during electro-etching dominates the Ir modification and casting of bifunctional Ir-Ni3+ sites. Ir serves as the active site in a high valence state and cooperates with Ni3+ to catalyze the OER. Meanwhile, Ir promotes the recombination of Had while Ni3+ as the co-catalyst accelerates the cleavage of the H-OH bond, which jointly improve the HER activity. Ir@Ni/NiO exhibits extraordinary overall water splitting performance, with an overpotential of 193.8 mV for OER and 54.7 mV for HER at 10 mA cm−2. Furthermore, the two-electrode cell assembled with Ir@Ni/NiO requires only a low cell voltage of 1.50 V to achieve a current density of 10 mAcm−2, outperforming the commercial IrO2 and Pt. This work blazes the trail for the rational design of water-splitting catalysts and the advancement of alkaline water-splitting for hydrogen production.

Keywords: Full water splitting; Bifunctional catalytic sites; Ir-Ni3+; Core/shell porous nanorod arrays (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261923017336
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:356:y:2024:i:c:s0306261923017336

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2023.122369

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().