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Cubic Cu 2 O/Cu 2 S Particles with a Unique Truncated Edge Structure Anchoring on Reduced Graphene Oxide as An Enhanced Anode Material for Sodium‐Ion Batteries
Author(s) -
Wang Ke,
Huang Ying,
Zhu Yade,
Yu Meng,
Wang Mingyue
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201701162
Subject(s) - graphene , materials science , anode , oxide , composite number , chemical engineering , electrochemistry , composite material , nanotechnology , electrode , metallurgy , chemistry , engineering
Abstract Cubic Cu 2 O/Cu 2 S particles with a novel truncated edge structure anchoring on reduced graphene oxide (Cu 2 O/Cu 2 S‐rGO composites) were synthesized by using a facile growth process. Compared to simple Cu 2 O cubes and bare Cu 2 O/Cu 2 S particles, the Cu 2 O/Cu 2 S‐rGO composite shows a competitive capacity and stable cyclic stability as anode materials for sodium‐ion batteries (SIBs). At a low current density of 60 mA g −1 , the Cu 2 O/Cu 2 S‐rGO composite delivers an initial discharge capacity of 878.6 mAh g −1 , stable cycling stability of 417.35 mAh g −1 after 100 cycles, retaining 73.5 % of its initial charge capacity, demonstrating a significantly improved cycling reversibility and structural stability. The enhanced electrochemical performance for Cu 2 O/Cu x S‐rGO composites might be ascribed to the rGO coating and the “breathable” structure formed by Cu 2 O and Cu 2 S. The outer coated rGO nanosheets could maintain the structural integrity and electrical conductivity, and the main active component (Cu 2 O and Cu 2 S) is present in the form of small clusters, providing “breathable” aggregates capable of effective sequential shrinkage and expansion.