Calcium-doped lanthanum nickelate layered perovskite and nickel oxide nano-hybrid for highly efficient water oxidation. (March 2015)

• Record Type: Journal Article
• Authors: Liu, Ruochen; Liang, Fengli; Zhou, Wei; Yang, Yisu; Zhu, Zhonghua
• Is Part Of: Nano energy. Volume 12(2015:Mar.)
• Page Start: 115
• Page End: 122
• Publication Date: 2015-03
• Subjects: Water splitting -- Oxygen evolution reaction -- Layered perovskite -- NiO -- Hybrid electrocatalyst; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2014.12.025
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Perovskite oxides have attracted great attention recently for its high intrinsic activity in oxygen evolution reaction (OER) in electrochemical energy storage and conversion systems. However, their specific activity and durability require substantial enhancement to meet the requirement of the practical applications. Here, we demonstrate for the first time that a layered perovskite-metal oxide nano-hybrid electrocatalyst synthesized through a one-pot combustion process shows remarkably high OER activity in alkaline solution. The hybrid consists of two major phases, i.e. NiO and K2 NiF4 -type layered perovskite (La0.613 Ca0.387 )2 NiO3.562, showing synergistically enhanced OER activity and excellent durability under harsh OER operating conditions. The NiO–(La0.613 Ca0.387 )2 NiO3.562 hybrid exhibits the lowest Tafel slope (~42 mV dec −1 ) and highest mass activity (52.2 mA mg −1 @ 1.63 V vs RHE) among all catalysts studied including noble metal oxide RuO2 and well-known perovskite Ba0.5 Sr0.5 Co0.8 Fe0.2 O3− δ . Graphical abstract: Highlights: NiO–(La0.613 Ca0.387 )2 NiO3.562 hybrid electrocatalyst was synthesized through one-pot combustion. The structure of hybrid catalyst exhibited the combination of two major phases: NiO and K2 NiF4 -type layered perovskite structure. The hybrid electrocatalyst had synergetically enhanced activity of oxygen evolution reaction. The hybrid electrocatalyst displayed lower overpotential and increased durability as compared to noble metal oxide RuO2 and well-known perovskite Ba0.5 Sr0.5 Co0.8 Fe0.2 O3− δ .