Abstract
Layered metal sulfides (MoS2, WS2, SnS2, and SnS) offer high potential as advanced anode materials in sodium ion batteries upon integration with highly-conductive graphene materials. However, in addition to being costly and time-consuming, existing strategies for synthesizing sulfides/graphene composites often involve complicated procedures. It is therefore essential to develop a simple yet scalable pathway to construct sulfide/graphene composites for practical applications. Here, we highlight a one-step, template-free, high-throughput “self-bubbling” method for producing MoS2/graphene composites, which is suitable for large-scale production of sulfide/graphene composites. The final product featured MoS2 nanoflakes distributed in three-dimensional macroporous monolithic graphene. Moreover, this unique MoS2/graphene composite achieved remarkable electrochemical performance when being applied to Na-ion battery anodes; namely, excellent cycling stability (474 mA h g−1 at 0.1 A g−1 after 100 cycles) and high rate capability (406 mA h g−1 at 0.25 A g−1 and 359 mA h g−1 at 0.5 A g−1). This self-bubbling approach should be applicable to delivering other graphene-based composites for emerging applications such as energy storage, catalysis, and sensing.
Highlights
Linfeng Fei, a Ming Xu,ac Juan Jiang,ad Sheung Mei Ng,a Longlong Shu,b Li Sun, e Keyu Xie, fg Haitao Huang, a Chi Wah Leung,a Chee Leung Mak*a and Yu Wang*b
We demonstrate a one-step “self-bubbling” system, for the rst time, to synthesize the graphene/MoS2 composite in this work
(NH4)2MoS4 decomposes into MoS2 and crystallizes while the released gas species blow the melted glucose to form crowded bubbles with ultrathin walls, which are graphitized into 3D graphene networks at high temperature
Summary
Linfeng Fei, a Ming Xu,ac Juan Jiang,ad Sheung Mei Ng,a Longlong Shu,b Li Sun, e Keyu Xie, fg Haitao Huang, a Chi Wah Leung,a Chee Leung Mak*a and Yu Wang*b. The final product featured MoS2 nanoflakes distributed in three-dimensional macroporous monolithic graphene This unique MoS2/graphene composite achieved remarkable electrochemical performance when being applied to Na-ion battery anodes; namely, excellent cycling stability (474 mA h gÀ1 at 0.1 A gÀ1 after 100 cycles) and high rate capability (406 mA h gÀ1 at 0.25 A gÀ1 and 359 mA h gÀ1 at 0.5 A gÀ1). This self-bubbling approach should be applicable to delivering other graphene-based composites for emerging applications such as energy storage, catalysis, and sensing. Carbon materials, especially graphene, have been repeatedly con rmed to be an efficient conductive additive in electrode materials in resolving the above issues.[28,29] Some examples of such effective treatment on electrode materials include sulfur/graphene cathode in lithium–sulfur batteries,[30] lithium metal phosphates/carbon cathode materials in LIBs,[31,32,33,34] and various metal oxides/graphene anode materials in LIBs.[35]
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