Hierarchically porous nickel-iridium-ruthenium-aluminum alloys with tunable compositions and electrocatalytic activities towards the oxygen/hydrogen evolution reaction in acid electrolyte

Developing efficient and less noble-metal-dependent electrocatalysts toward both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is one of the key challenges for polymer electrolyte membrane (PEM) electrolyzer applications. Herein, we report the preparation of bifunctional...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2020-04, Vol.8 (13), p.6245-6255
Main Authors: Liu, Na, Yin, Kuibo, Si, Conghui, Kou, Tianyi, Zhang, Ying, Ma, Wensheng, Zhang, Zhonghua
Format: Article
Language:English
Subjects:
Aluminum
Aluminum base alloys
Composition
Electrocatalysts
Electrolytes
Evolution
Hydrogen evolution reactions
Iridium
Metallurgy
Nanotechnology
Nanowires
Nickel
Noble metals
Oxygen
Oxygen evolution reactions
Polymers
Ruthenium
Water splitting
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Developing efficient and less noble-metal-dependent electrocatalysts toward both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is one of the key challenges for polymer electrolyte membrane (PEM) electrolyzer applications. Herein, we report the preparation of bifunctional NiIrRuAl multimetallic nanoporous nanowires (NPNWs) with different compositions through the combination of metallurgical control and a two-step dealloying method. The synthesized NiIrRuAl NPNWs display ultrahigh OER and HER activities in acid solution. With a significantly reduced noble metal (Ir and Ru) content as low as 34 at%, the NiIrRuAl-1/3 electrocatalyst (Ir : Ru = 1 : 3) yields the best OER performance, showing an extremely low overpotential of 237 mV at 10 mA cm −2 , and the overpotential of the NiIrRuAl-3/1 electrocatalyst (Ir : Ru = 3 : 1) in the HER is only 14 mV at 10 mA cm −2 in 0.1 M HClO 4 solution. More significantly, the NiIrRuAl NPNWs only need a cell voltage of 1.464 V to reach 10 mA cm −2 for overall water splitting and show excellent long-term stability. Bifunctional NiIrRuAl nanoporous nanowires obtained by a two-step dealloying method exhibit excellent electrocatalytic performance towards the oxygen/hydrogen evolution reaction in an acid electrolyte.
ISSN:2050-7488
2050-7496
DOI:10.1039/d0ta00445f