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Title: Graphene Wrapped FeSe2 Nano–Microspheres with High Pseudocapacitive Contribution for Enhanced Na–Ion Storage

Abstract

Pseudocapacitance is a Faradaic process that involves surface or near surface redox reactions. Increasing the pseudocapacitive contribution is one of the most effective means to improve the rate performance of electrode materials. In this study, graphene oxide is used as a template to in situ synthesize burr globule–like FeSe2/graphene hybrid (B–FeSe2/G) using a facile one–step hydrothermal method. Structural characterization demonstrates that graphene layers not only wrap the surfaces of FeSe2 particles, but also stretch into the interior of these particles, as a result of which the unique nano–microsphere structure is successfully established. When serving as anode material for Na–ion batteries, B–FeSe2/G hybrid displays high electrochemical performance in the voltage range of 0.5–2.9 V. The B–FeSe2/G hybrid has high reversible capacity of 521.6 mAh·g–1 at 1.0 A g–1. Meanwhile, after 400 cycles, high discharge capacity of 496.3 mAh g–1 is obtained at a rate of 2.5 A g–1, with a high columbic efficiency of 96.6% and less than 1.0% loss of discharge capacity. Even at the ultrahigh rate of 10 A g–1, a specific capacity of 316.8 mAh g–1 can be achieved. Furthermore, kinetic analyses reveal that the excellent performance of the B–FeSe2/G hybrid is largely attributed to the high pseudocapacitivemore » contribution induced by the special nano–micro structure.« less

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [2]
  1. Central South Univ., Changsha (China)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Natural Science Foundation of China (NNSFC); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1530423
Alternate Identifier(s):
OSTI ID: 1511769
Grant/Contract Number:  
AC02-06CH11357; AC02‐06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 9; Journal Issue: 18; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 25 ENERGY STORAGE; burr globule-like; graphene; nano-microspheres; pseudocapacitive contribution; sodium-ion batteries

Citation Formats

An, Changsheng, Yuan, Yifei, Zhang, Bao, Tang, Linbo, Xiao, Bin, He, Zhenjiang, Zheng, Junchao, and Lu, Jun. Graphene Wrapped FeSe2 Nano–Microspheres with High Pseudocapacitive Contribution for Enhanced Na–Ion Storage. United States: N. p., 2019. Web. doi:10.1002/aenm.201900356.
An, Changsheng, Yuan, Yifei, Zhang, Bao, Tang, Linbo, Xiao, Bin, He, Zhenjiang, Zheng, Junchao, & Lu, Jun. Graphene Wrapped FeSe2 Nano–Microspheres with High Pseudocapacitive Contribution for Enhanced Na–Ion Storage. United States. doi:10.1002/aenm.201900356.
An, Changsheng, Yuan, Yifei, Zhang, Bao, Tang, Linbo, Xiao, Bin, He, Zhenjiang, Zheng, Junchao, and Lu, Jun. Tue . "Graphene Wrapped FeSe2 Nano–Microspheres with High Pseudocapacitive Contribution for Enhanced Na–Ion Storage". United States. doi:10.1002/aenm.201900356. https://www.osti.gov/servlets/purl/1530423.
@article{osti_1530423,
title = {Graphene Wrapped FeSe2 Nano–Microspheres with High Pseudocapacitive Contribution for Enhanced Na–Ion Storage},
author = {An, Changsheng and Yuan, Yifei and Zhang, Bao and Tang, Linbo and Xiao, Bin and He, Zhenjiang and Zheng, Junchao and Lu, Jun},
abstractNote = {Pseudocapacitance is a Faradaic process that involves surface or near surface redox reactions. Increasing the pseudocapacitive contribution is one of the most effective means to improve the rate performance of electrode materials. In this study, graphene oxide is used as a template to in situ synthesize burr globule–like FeSe2/graphene hybrid (B–FeSe2/G) using a facile one–step hydrothermal method. Structural characterization demonstrates that graphene layers not only wrap the surfaces of FeSe2 particles, but also stretch into the interior of these particles, as a result of which the unique nano–microsphere structure is successfully established. When serving as anode material for Na–ion batteries, B–FeSe2/G hybrid displays high electrochemical performance in the voltage range of 0.5–2.9 V. The B–FeSe2/G hybrid has high reversible capacity of 521.6 mAh·g–1 at 1.0 A g–1. Meanwhile, after 400 cycles, high discharge capacity of 496.3 mAh g–1 is obtained at a rate of 2.5 A g–1, with a high columbic efficiency of 96.6% and less than 1.0% loss of discharge capacity. Even at the ultrahigh rate of 10 A g–1, a specific capacity of 316.8 mAh g–1 can be achieved. Furthermore, kinetic analyses reveal that the excellent performance of the B–FeSe2/G hybrid is largely attributed to the high pseudocapacitive contribution induced by the special nano–micro structure.},
doi = {10.1002/aenm.201900356},
journal = {Advanced Energy Materials},
number = 18,
volume = 9,
place = {United States},
year = {2019},
month = {3}
}

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