Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 20, Issue 38, Pages 12183-12189Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201403471
Keywords
energy conversion; energy-storage materials; nanostructures; reduced graphene oxides; synthesis design
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MEST) [2012R1A2A2A02046367]
- Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy, Republic of Korea [201320200000420]
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A facile, one-pot method for synthesizing spherical-like metal sulfide-reduced graphene oxide (RGO) composite powders by spray pyrolysis is reported. The direct sulfidation of ZnO nanocrystals decorated on spherical-like RGO powders resulted in ZnS-RGO composite powders. ZnS nanocrystals with a size below 20 nm were uniformly dispersed on spherical-like RGO balls. The discharge capacities of the ZnS-RGO, ZnO-RGO, bare ZnS, and bare ZnO powders at a current density of 1000 mAg(-1) after 300 cycles were 628, 476, 230, and 168 mAhg(-1), respectively, and the corresponding capacity retentions measured after the first cycles were 93, 70, 40, and 21 %, respectively. The discharge capacity of the ZnS-RGO composite powders at a high current density of 4000 mAg(-1) after 700 cycles was 437 mAhg(-1). The structural stability of the highly conductive ZnS-RGO composite powders with ultrafine crystals during cycling resulted in excellent electrochemical properties.
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