NDLI: Three-dimensional astrocyte-network Ni–P–O compound with superior electrocatalytic activity and stability for methanol oxidation in alkaline environments

Content Provider	Royal Society of Chemistry (RSC)
Author	Huang, M. L. Tong, Y. Y. Tang, H. Tu, J. P. Zhang, J. L. Gu, C. D. Wang, X. L.
Copyright Year	2015
Abstract	Three Ni–P–O compound catalysts with tunable architectures and compositions have been fabricated using a facile one-pot solvothermal method, which are named astrocyte-network Ni–P (Ni–Pan), silkworm cocoon-like Ni–P (Ni–Psc), and microsphere Ni–P (Ni–Pm), respectively. The final architecture of the Ni–P–O catalysts is strongly dependent on the Ni2+/H2PO2− molar ratio in the reaction system, which leads to a delicate balance between kinetic and thermodynamic growth regimes. Three-dimensional ensemble of Ni–Pan with a higher P content is composed of many amorphous Ni–P nanowires with a diameter of about 4 nm, which delivers a significantly larger BET surface area of 500.5 m2 g−1. Moreover, nickel phosphides and nickel phosphates are formed in the three Ni–P–O samples. Ni–Pan exhibits a higher peak current density of ∼1490 A g−1, better electrode accessibility, faster charge-transfer process, and long-term chronoamperometry stability (≥20 000 s) toward methanol oxidation in alkaline solution, which are superior to most state-of-art Ni–P catalysts and the Ni–Psc and Ni–Pm in this case. The superior catalytic performance of the Ni–Pan catalyst is attributed to its unique microstructure and compositions. According to X-ray photoelectron spectroscopy, a strong electronic interaction between nickel phosphides and nickel phosphates might also contribute to the improved catalytic activity of the Ni–Pan catalyst.
Starting Page	4669
Ending Page	4678
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	8
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta06697a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	BET Bombyx mori Microparticle Nickel Electric current Electrode Chronoamperometry Methanol X-ray photoelectron spectroscopy Photoemission spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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