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2D Free‐Standing Nitrogen‐Doped Ni‐Ni 3 S 2 @Carbon Nanoplates Derived from Metal–Organic Frameworks for Enhanced Oxygen Evolution Reaction
Author(s) -
Lin Yifan,
Chen Gen,
Wan Hao,
Chen Fashen,
Liu Xiaohe,
Ma Renzhi
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201900348
Subject(s) - materials science , overpotential , carbon fibers , metal organic framework , pyrolysis , chemical engineering , nickel , sulfide , nanoparticle , inorganic chemistry , nanotechnology , nickel sulfide , nanomaterials , graphene , organic chemistry , chemistry , composite material , metallurgy , adsorption , electrode , electrochemistry , composite number , engineering
2D metal–organic frameworks (2D MOFs) are promising templates for the fabrication of carbon supported 2D metal/metal sulfide nanocomposites. Herein, controllable synthesis of a newly developed 2D Ni‐based MOF nanoplates in well‐defined rectangle morphology is first realized via a pyridine‐assisted bottom‐up solvothermal treatment of NiSO 4 and 4,4′‐bipyridine. The thickness of the MOF nanoplates can be controlled to below 20 nm, while the lateral size can be tuned in a wide range with different amounts of pyridine. Subsequent pyrolysis treatment converts the MOF nanoplates into 2D free‐standing nitrogen‐doped Ni‐Ni 3 S 2 @carbon nanoplates. The obtained Ni‐Ni 3 S 2 nanoparticles encapsulated in the N‐doped carbon matrix exhibits high electrocatalytic activity in oxygen evolution reaction. A low overpotential of 284.7 mV at a current density of 10 mA cm −2 is achieved in alkaline solution, which is among the best reported performance of substrate‐free nickel sulfides based nanomaterials.