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α‐Co(OH) 2 Thin‐Layered Cactus‐Like Nanostructures Wrapped Ni 3 S 2 Nanowires: A Robust and Potential Catalyst for Electro‐oxidation of Hydrazine
Author(s) -
Xie Yichun,
Wang Zining,
Wang Hui,
Lu Lei,
Subramanian Palaniappan,
Ji Shan,
Kannan Palanisamy
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202100068
Subject(s) - nanowire , materials science , catalysis , thin film , hydrazine (antidepressant) , nanostructure , chemical engineering , nanotechnology , substrate (aquarium) , chemistry , organic chemistry , chromatography , engineering , oceanography , geology
It is of significant urgency to fabricate highly active catalysts for electro‐oxidation of hydrazine for application in direct hydrazine fuel cells (DHFCs). Thus, in this work we grow three‐dimensional (3‐D) α‐Co(OH) 2 thin‐layered cactus‐like nanostructures (shell) on the surface of Ni 3 S 2 nanowires (core) enveloped nickel (Ni) foam substrate. HRTEM images clearly reveal that the α‐Co(OH) 2 thin‐layered cactus‐like nanostructures (shell) are evenly surrounded on the surface of Ni 3 S 2 nanowires (core). Notably, α‐Co(OH) 2 /Ni 3 S 2 thin‐layered cactus‐like nanowires modified Ni foam displays an enhanced electro‐oxidation of hydrazine (340 mA current response and the onset oxidation potential of −1.10 V) than α‐Co(OH) 2 sponge‐like, and Ni 3 S 2 nanowire structures. The obtained enhanced electro‐catalytic response is mainly due to its electron rich Ni active centers, larger electrochemically active surface area, higher electrical conductivity, and porous surface‐structure formed by growing α‐Co(OH) 2 thin‐layered cactus‐like nanostructures on the Ni 3 S 2 nanowires, henceforth increasing the inherent activity and the number of available active sites/spots. Further, the α‐Co(OH) 2 /Ni 3 S 2 thin‐layered cactus‐like nanowire catalyst shows notable stability (stable for more than a week) towards electro‐oxidation of hydrazine. Thus, as fabricated cactus‐like thin‐layered α‐Co(OH) 2 /Ni 3 S 2 core‐shell nanowires catalyst can be considered as potential and robust catalyst for electro‐oxidation of hydrazine.