Encapsulating Fe2O3 Nanotubes into Carbon‐Coated Co9S8 Nanocages Derived from a MOFs‐Directed Strategy for Efficient Oxygen Evolution Reactions and Li‐Ions Storage. Issue 51 (15th October 2021)

• Record Type: Journal Article
• Authors: Huang, Shoushuang; Jin, Zhiqiang; Ding, Yanwei; Ning, Ping; Chen, Qiaochuan; Fu, Jie; Zhang, Qian; Zhang, Jie; Xin, Peijun; Jiang, Yong; Hu, Zhangjun
• Is Part Of: Small. Volume 17:Issue 51(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-10-15
• Subjects: chemical etching -- energy storage -- Fe 2O 3 -- hollow structure -- oxygen evolution reaction; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202103178
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: The development of high‐efficiency, robust, and available electrode materials for oxygen evolution reaction (OER) and lithium‐ion batteries (LIBs) is critical for clean and sustainable energy system but remains challenging. Herein, a unique yolk–shell structure of Fe2 O3 nanotube@hollow Co9 S8 nanocage@C is rationally prepared. In a prearranged sequence, the fabrication of Fe2 O3 nanotubes is followed by coating of zeolitic imidazolate framework (ZIF‐67) layer, chemical etching of ZIF‐67 by thioacetamide, and eventual annealing treatment. Benefiting from the hollow structures of Fe2 O3 nanotubes and Co9 S8 nanocages, the conductivity of carbon coating and the synergy effects between different components, the titled sample possesses abundant accessible active sites, favorable electron transfer rate, and exceptional reaction kinetics in the electrocatalysis. As a result, excellent electrocatalytic activity for alkaline OER is achieved, which delivers a low overpotential of 205 mV at the current density of 10 mA cm −2 along with the Tafel slope of 55 mV dec −1 . Moreover, this material exhibits excellent high‐rate capability and excellent cycle life when employed as anode material of LIBs. This work provides a novel approach for the design and the construction of multifunctional electrode materials for energy conversion and storage. Abstract : A unique yolk‐shell structure of Fe2 O3 nanotube@hollow Co9 S8 nanocage@C is rationally designed and synthesized via engineering a Fe2 O3 nanotube@ZIF‐67 core‐shell structure followed by chemical etching/anion exchange and carbonization at high temperature in sequence. This material exhibits outstanding electrocatalytic activity and stability for alkaline oxygen evolution reaction, and good high‐rate capability as anode material of Li‐ions batteries.