Mesoporous reduced graphene oxide/WSe2 composite particles for efficient sodium-ion batteries and hydrogen evolution reactions

被引：49

作者：

Cho, Jung Sang ^{[1
,2
]}

Park, Seung-Keun ^{[1
,3
]}

Jeon, Kyung Min ^{[1
]}

Piao, Yuanzhe ^{[4
,5
]}

Kang, Yun Chan ^{[1
]}

机构：

[1] Korea Univ, Dept Mat Sci & Engn, Seoul 136713, South Korea

[2] Chungbuk Natl Univ, Dept Engn Chem, Cheongju, South Korea

[3] Kongju Natl Univ, Dept Chem Engn, Budae Dong 275, Chungnam 314701, South Korea

[4] Seoul Natl Univ, Grad Sch Convergence Sci & Technol, Program Nano Sci & Technol, 145 Gwanggyo Ro, Suwon 443270, Gyeonggi Do, South Korea

[5] Adv Inst Convergence Technol, 145 Gwanggyo Ro, Suwon 443270, Gyeonggi Do, South Korea

来源：

APPLIED SURFACE SCIENCE | 2018年 / 459卷

关键词：

Tungsten selenide; Sodium ion batteries; Hydrogen evolution; Graphene; Spray pyrolysis; PERFORMANCE ANODE MATERIALS; TRANSITION-METAL DICHALCOGENIDES; MOS2 ULTRATHIN NANOSHEETS; CORE-SHELL COMPOSITES; ACTIVE EDGE SITES; ELECTROCHEMICAL PROPERTIES; CATALYTIC-ACTIVITY; PHASE-TRANSITION; ELECTROCATALYSTS; WSE2;

D O I：

10.1016/j.apsusc.2018.07.200

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Mesoporous WSe2-reduced graphene oxide (WSe2-rGO) composite particles were prepared by spray pyrolysis and subsequent selenization. The WSe2-rGO composite particles had both well-dispersed rGO nanosheets and well-faceted WSe2 nanocrystals with plenty of folded edges. As a comparison sample, hierarchical structured WSe2 particles were produced by selenization of the bare WO3 particles obtained by spray pyrolysis. The WSe2-rGO composite particles showed superior electrochemical properties for sodium-ion batteries (SIBs) and electrocatalytic efficiencies for hydrogen evolution reactions (HERs) compared to those of the bare WSe2 particles. The discharge capacities of the WSe2-rGO composite particles and bare WSe2 particles for the 100th cycle at a current density of 0.5 A g(-1) for sodium-ion storage were 238 and 36 mA h g(-1), respectively; their corresponding capacity retentions measured from the third cycle were 80% and 13%. The WSe2-rGO composite particles showed much lower onset potential and larger current density (36.5 mA cm(-2) at eta = 300 mV) than those of the bare WSe2 particles (0.61 mA cm(-2) at = 300 mV). The Tafel slopes for the WSe2-rGO composite and bare WSe2 particles were approximately 60 and 115 mV dec(-1), respectively.

引用

页码：309 / 317

页数：9

共 57 条

[31] Sodium-ion storage properties of nickel sulfide hollow nanospheres/reduced graphene oxide composite powders prepared by a spray drying process and the nanoscale Kirkendall effect [J].