Ultrathin VS₂ nanoplate with in-plane and out-of-plane defects for an electrochemical supercapacitor with ultrahigh specific capacitance

Abstract

We report the rational design and synthesis of ultrathin VS2 TMD nanoplate with in-plane and out-of-plane defects for supercapacitor applications.

Novel Sub‐5 nm Layered Niobium Phosphate Nanosheets for High‐Voltage, Cation‐Intercalation Typed Electrochemical Energy Storage in Wearable Pseudocapacitors

“…The specific capacitance of the NPene@CFC electrode was 1421.6 F g −1 at the scan rate of 2 mV s −1 in HCl (3.0 m ) electrolyte. More importantly, the operating potential window of the present NPene@CFC electrode in acid electrolyte is up to 1.0 V (Figure S17, Supporting Information), depicting a higher potential window than most of the other conventional materials for WSSPs (Figure e) …”

“…The reason should be ascribed to the decomposition of NPene in an alkaline condition and the rapid Faradaic pseudocapacitance process activated by H + or Li + . [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] Note that the CV curves show widely separated peaks associated with the redox of the metal centers involved in charge storage. The Nyquist plot of the NPene@CFC electrode shows the nearly negligible charge transfer resistance (R ct ) of the electrode, demonstrating the fast transportation procedure of ions ( Figure S16, Supporting Information).…”

TMDs beyond MoS2 for Electrochemical Energy Storage

“…Alternatively, there are studies in which VS 2 is the active material for supercapacitors that did not employ CVD for its synthesis. In fact, as reported by Guo et al., materials with low degree of crystallinity, as well as amorphous ones, may provide more active sites and shorter pathways for electrolyte ion diffusion, therefore providing enhanced diffusion rate . By using a colloidal method, defect‐rich VS 2 nanoplates were prepared and studied as supercapacitor materials.…”

A Facile Grinding Method for the Synthesis of 3D Ag Metal–Organic Frameworks (MOFs) Containing Ag6Mo7O24 for High‐Performance Supercapacitors

“…In addition, the supercapacitor performances of the symmetrical button battery ( Figure S23 in the Supporting Information) of the {Ag 6 Mo 7 O 24 }@Ag-MOF electrode with foamedn ickel as the current collector were also studied. The CV curvesa td ifferent scanning speeds ( Figure S24 in the Supporting Information, 5-100 mVs À1 )w ere tested with aw ide voltage window of 1.2 V. The GCD curves (Figure 8a)were investigated at different current densities of 1-5 Ag À1 .W hen the current density is 1Ag À1 ,t he highest specific capacitance is 55.4 Fg À1 .A ss hown in Figure 8b Figure 8d.W hen the P value of the button battery is 600.1 Wkg À1 ,t he E max reaches 11.1 Wh kg À1 ,w hich is significantly better than many previouslyr eported supercapacitors [43][44][45][46][47][48] (Table S1 in the Supporting Information).…”

“…The EIS (Figure c) curves were found to be 5.6 and 5.9 Ω before and after the cycles (Figure S25 in the Supporting Information). The Ragone plot of the {Ag 6 Mo 7 O 24 }@Ag‐MOF‐based supercapacitor is shown in Figure d. When the P value of the button battery is 600.1 W kg −1 , the E max reaches 11.1 Wh kg −1 , which is significantly better than many previously reported supercapacitors (Table S1 in the Supporting Information).…”