ZnFe2O4@carbon core-shell nanoparticles encapsulated in reduced

2 hours ago - User Resources. About Us · ACS Members · Librarians · ACS Publishing Center · Website Demos · Privacy Policy · Mobile Site ...
0 downloads 0 Views 1MB Size
Subscriber access provided by UNIV OF LOUISIANA

Energy, Environmental, and Catalysis Applications

ZnFe2O4@carbon core-shell nanoparticles encapsulated in reduced graphene oxide for high-performance Li-ion hybrid supercapacitors Chongyang Yang, Minqiang Sun, Long Zhang, Peiying Liu, Peng Wang, and Hongbin Lu ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.8b20305 • Publication Date (Web): 02 Apr 2019 Downloaded from http://pubs.acs.org on April 2, 2019

Just Accepted “Just Accepted” manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides “Just Accepted” as a service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. “Just Accepted” manuscripts appear in full in PDF format accompanied by an HTML abstract. “Just Accepted” manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are citable by the Digital Object Identifier (DOI®). “Just Accepted” is an optional service offered to authors. Therefore, the “Just Accepted” Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the “Just Accepted” Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these “Just Accepted” manuscripts.

is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Published by American Chemical Society. Copyright © American Chemical Society. However, no copyright claim is made to original U.S. Government works, or works produced by employees of any Commonwealth realm Crown government in the course of their duties.

Page 1 of 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

ACS Applied Materials & Interfaces

ZnFe2O4@carbon core-shell nanoparticles encapsulated in reduced graphene oxide for high-performance Li-ion hybrid supercapacitors Chongyang Yang,†,‡ Minqiang Sun,† Long Zhang,† Peiying Liu,† Peng Wang,† Hongbin Lu*,†

†State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Collaborative Innovation Center of Polymers and Polymer Composites, Fudan University, 2005 Songhu Road, Shanghai 200438, China ‡National Engineering Research Center for Supercapacitor for Vechicles, Shanghai Aowei Technology Development Co., Ltd., Shanghai 201203, China

Abstract: Li-ion hybrid supercapacitors (Li-HSCs) are attracting extensive attention because of the high energy/power densities. However, the performance of most Li-HSCs suffers from the limitation from sluggish kinetics of battery-type anodes. Herein, we demonstrate that with dual protection of carbon and graphene, the three-dimensional, strongly coupled ZnFe2O4@C/RGO composite anode provides an effective solution to this issue. The covalent C-O-M linkage between ZnFe2O4 nanoparticles and C/RGO promotes the charge transfer and enhances structural stability. Two kinds of carbon-based buffering layers are able to well accommodate the volume change during charging/discharging, endowing the composite anode with high rate performance (692 mAh g-1 at 5 A g-1) and outstanding cycle life (98.3% of capacity retention after 700 cycles at 1 A g-1). The resulting ZnFe2O4@C/RGO// activated carbon (AC) Li-HSC shows an ultrahigh energy density of 174 Wh kg-1, excellent power density of 51.4 kW kg-1 (at 109 Wh kg-1) and cycle life (80.5% retention of capacity after 10000 cycles at 5 A g-1).

KEYWORDS: ZnFe2O4, carbon shell, graphene, anode, Li-ion hybrid supercapacitor 1

ACS Paragon Plus Environment

ACS Applied Materials & Interfaces 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Page 2 of 23

1. Introduction Nowadays, energy-storage devices with both high energy/power densities and long cycle life are urgently desired owing to the ever-increasing portable electronics, smart electric grids and electric vehicles (EVs). By integrating the advantages of Li-ion batteries (LIBs) and supercapacitors (SCs), Li-ion hybrid supercapacitors (Li-HSCs) have become an effective approach to balance the high energy and high power.1-3 Generally, Li-HSC consists of a battery-type anode that affords high capacity and a capacitor-type cathode that achieves fast charge-discharge,

implying

that

two

different

energy

storage

mechanisms

work

simultaneously in this hybrid system.4-6 Despite considerable effort in recent years,7-11 the high energy densities (50-200 Wh kg-1) achieved in the majority of the reported results are usually sacrificing power densities (