Phosphoric acid-assisted synthesis of layered MoS2/graphene hybrids with electrolyte-dependent supercapacitive behaviors. Issue 92 (19th September 2016)

• Record Type: Journal Article
• Authors: Xie, Bingqiao; Chen, Ying; Yu, Mengying; Zhang, Shanshan; Lu, Luhua; Shu, Zhu; Zhang, Yong
• Is Part Of: RSC advances. Volume 6:Issue 92(2016)
• Page Start: 89397
• Page End: 89406
• Publication Date: 2016-09-19
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra17109e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : An electrolyte-dependent behavior (greatly differ in pseudocapacitance) was investigated in the modified freestanding layered MoS2 /graphene hybrid. Abstract : A reformative graphene-supported MoS2 hybrid has been synthesized by a phosphoric acid (H3 PO4 )-assisted hydrothermal process. The effect of H3 PO4 on the growth, morphology, structure, and composition of the MoS2 /graphene hybrid has been explored by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results indicate that H3 PO4 can control the process of both the reduction of graphene oxide and the crystallization of MoS2 . The electrochemical performance suggests that involvement of H3 PO4 in the reaction bestows the hybrid with electrolyte-dependent capacitive behaviors in which contribution from electric double-layer capacitance (EDLC) and pseudocapacitance can be distinguished in acidic and alkaline electrolytes, respectively. While the quasi-EDLC behavior of the hybrid dominates in an alkaline electrolyte (258 F g −1 at 2 A g −1 ), the pseudocapacitance of the hybrid in an acidic electrolyte can be significantly enhanced due to oxygen-containing groups and Mo active in the total capacitance value (351 F g −1 at 2 A g −1 ). Moreover, a superior cycling performance and quick frequency response of the hybrid reinforces its potential for supercapacitor applications.