“…In the circumstance, supercapacitor has again attracted significant interest in recent years owing to their outstanding properties, including high rate capacity and long cycle life compared with batteries in energy storage devices [2][3][4][5][6][7]. As an important pseudocapacitor material, transition metal oxides is being widely exploited for high performance supercapacitors due to their low cost, low toxicity and high theoretical specific capacity [8,9].…”
“…In the circumstance, supercapacitor has again attracted significant interest in recent years owing to their outstanding properties, including high rate capacity and long cycle life compared with batteries in energy storage devices [2][3][4][5][6][7]. As an important pseudocapacitor material, transition metal oxides is being widely exploited for high performance supercapacitors due to their low cost, low toxicity and high theoretical specific capacity [8,9].…”
“…Figure 7a displays their CV curves at the sweeping rate of 20 mV s –1 . There are a pair of redox peaks in both CV curves of Ni 3 Si 2 O 5 (OH) 4 /RGO and bare Ni 3 Si 2 O 5 (OH) 4 microspheres, which arise from the transition of nickel ions between different oxidation states [10, 27, 30]:Fig. 7
a CV curves of Ni 3 Si 2 O 5 (OH) 4 /RGO hollow microspheres ( black curve ), bare Ni 3 Si 2 O 5 (OH) 4 hollow microspheres ( red curve ), and bare RGO material ( blue curve ) tested at the scanning rate of 20 mV s –1 in 2 M KOH.…”
Section: Resultsmentioning
confidence: 99%
“…implying their pseudocapacitive characteristics [27, 30], while there are no obvious redox peaks in the CV curve of bare RGO material, suggesting its electric double-layer capacitance nature [2, 4]. The peak current density and the integral area enclosed by the CV curve of Ni 3 Si 2 O 5 (OH) 4 /RGO hollow microspheres are higher than those of bare Ni 3 Si 2 O 5 (OH) 4 hollow microspheres and bare RGO material, indicating the best capacitance [4, 9].…”
Nickel silicate hydroxide/reduced graphene oxide (Ni3Si2O5(OH)4/RGO) composite hollow microspheres were one-pot hydrothermally synthesized by employing graphene oxide (GO)-wrapped SiO2 microspheres as the template and silicon source, which were prepared through sonication-assisted interfacial self-assembly of tiny GO sheets on positively charged SiO2 substrate microspheres. The composition, morphology, structure, and phase of Ni3Si2O5(OH)4/RGO microspheres as well as their electrochemical properties were carefully studied. It was found that Ni3Si2O5(OH)4/RGO microspheres featured distinct hierarchical porous morphology with hollow architecture and a large specific surface area as high as 67.6 m2 g–1. When utilized as a supercapacitor electrode material, Ni3Si2O5(OH)4/RGO hollow microspheres released a maximum specific capacitance of 178.9 F g−1 at the current density of 1 A g−1, which was much higher than that of the contrastive bare Ni3Si2O5(OH)4 hollow microspheres and bare RGO material developed in this work, displaying enhanced supercapacitive behavior. Impressively, the Ni3Si2O5(OH)4/RGO microsphere electrode exhibited outstanding rate capability and long-term cycling stability and durability with 97.6% retention of the initial capacitance after continuous charging/discharging for up to 5000 cycles at the current density of 6 A g−1, which is superior or comparable to that of most of other reported nickel-based electrode materials, hence showing promising application potential in the energy storage area.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-017-2094-9) contains supplementary material, which is available to authorized users.
“…Secondly, in order to chase the diversity, we devised a scheme to combine Co, Ni and Si, forming a type of ternary composition. [43] We took three steps and finally obtained the 1D Ni(SO 4 ) 0.3 (OH) 1.4 nanobelts material coated with SiO 2 , yielding Co 2. 18 Ni 0.82 Si 2 O 5 (OH) 4 .…”
Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning
This account mainly introduces and reviews our recent progress in three projects: antibacterial nanomaterial, electrocatalyst for detecting and electrode nanomaterial of energy storage device, especially the supercapacitor. Besides, our thought and idea about the design, fabrication and application of corresponding nanomaterials are sketched throughout the whole article in order to reveal the structure-function relationship and corresponding mechanism. In the end, we tend to attach importance to the bottleneck of nanomaterial's development and put forward our understanding in this field.
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