Shape-controlled synthesis of CoMoO4@Co1.5Ni1.5S4 hybrids with rambutan-like structure for high-performance all-solid-state supercapacitors

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2018-08, Vol.346, p.193-202
• Main Authors: Wang, Chao, Guan, Zhishu, Shen, Yanbin, Yu, Shuhui, Fu, Xian-Zhu, Sun, Rong, Wong, Ching-Ping
• Format: Article
• Language: English
• Subjects: All-solid-state supercapacitors; CoMoO4@Co1.5Ni1.5S4; Rambutan-like structure; Synergistic effect
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2018.03.160

CoMoO4@Co1.5Ni1.5S4 rambutan-like hybrids for electrochemical energy storage were directly synthesized on Ni foam by a facile hydrothermal method. The hybrids exhibited a high specific capacitance of 1405 F g−1 at the current density of 1 A g−1 and an excellent cyclic stability (92% of its initial specific capacitance retained after 1000 cycles at a current density of 10 A g−1). In addition, the all-solid-state asymmetric supercapacitor based on the CoMoO4@Co1.5Ni1.5S4 electrode material delivered a high energy density of 127.86 W h kg−1 at a power density of 2003.88 W kg−1. Moreover, the ASC devices in series were applied for lighting a red LED for a long time. Thus, the ASC devices exhibited great potential applications in the fields of energy storage and wearable electronics. [Display omitted] •The hybrids with rambutan-like structure were synthesized directly on Ni foam.•A high-performance all-solid-state asymmetric supercapacitor was constructed.•The hybrids showed an outstandingly high value of specific capacitance.•The hybrids showed an excellent cycling stability.•This work can be extended to electric and electronic applications. Hybrid-structured nanoparticles have demonstrated superior chemical, physical or electrochemical properties over a single component owing to the synergistic effects from each component. Here we report on rambutan-like cobalt molybdate@nickel cobalt sulfides (CoMoO4@Co1.5Ni1.5S4) hybrids for electrochemical energy storage which are synthesized on Ni foam by a facile hydrothermal method. CoMoO4 microspheres are directly grown on the Ni foam as the core and Co1.5Ni1.5S4 nanorods grown in sequence in shape of branches. This exceptional structure is beneficial for rapid electron transport and fast diffusion of ions owing to the existence of vast channels. Consequently, this hybrid electrode material exhibits an overall improved capacitive performance, including a high specific capacitance of 1405 F g−1 at the current density of 1 A g−1 and an excellent cyclic stability (92% retained after 1000 cycles at 10 A g−1). In addition, an all-solid-state asymmetric supercapacitor is fabricated which exhibits a high specific capacitance of 221.3 F g−1 collected at 1.5 A g−1, and a high energy density of 127.86 W h kg−1 is gained at a power density of 2003.88 W kg−1. After rapid charging (3 s), two such all-solid-state devices in series light a red light-emitting diode over 10 min. Thus, our work provides a remarkable candidate for energy