Functional integration and self-template synthesis of hollow core–shell carbon mesoporous spheres/Fe₃O₄/nitrogen-doped graphene to enhance catalytic activity in DSSCs

Abstract

Excellent corrosion resistance is crucial for photovoltaic devices to acquire high and stable performance under high corrosive complicated environments. Creative inspiration comes from sandwich construction, whereby Fe3O4 nanoparticles were anchored onto hollow core-shell carbon mesoporous microspheres and wrapped by N-graphene nanosheets (HCCMS/Fe3O4@N-RGO) to obtain integrated high corrosive resistance and stability. The as-prepared multiple composite material possesses outstanding performance as a result of structure optimization, performance improvement, and interface synergy. Therefore, it can effectively suppress corrosion from the electrolyte in recycled tests many times, indicating the ultrahigh corrosion resistance life of this double carbon-based nanocomposite. Furthermore, the electrical conductivity and conversion efficiency of the composite are well maintained due to the triple synergistic interactions, which could serve as a guideline in establishing high-performance multifunctional HCCMS/Fe3O4@N-RGO with great prospects in energy devices, such as lithium batteries, supercapacitors and electrode materials, etc.

Facile synthesis and promising application of iron‐doped nickel selenide nanoparticles as high‐efficiency counter electrodes of dye‐sensitized solar cells

“…The peak-to-peak separation (E pp ) and the cathodic peak current density (J ox-1 ) are generally utilized to characterize the electrocatalytic performance of electrode materials. 41,42 Following that, the multiple cyclic voltammetry was measured at a scan rate of 25 mV·s −1 to further evaluate the electrochemical duration and invertibility. 39 Besides, the biggest J ox-1 belongs to the cell based on 10% Fe-Ni 0.85 Se, revealing the faster triiodide reduction speed.…”

“…In addition, the four CEs present a linear relationship between the square root of the scan rate and the peak current density, which express that the catalysts and I − /I 3 − redox are not participated in the electrochemical reaction, thus lead to high stability and reversibility. 41,42 Following that, the multiple cyclic voltammetry was measured at a scan rate of 25 mV·s −1 to further evaluate the electrochemical duration and invertibility. As displayed in Figure 9, 10% Fe-Ni 0.85 Se distinctly possessed more excellent electrochemical stability during 20-cyclic CV curves comparing with other electrodes, which may profit from the synergistic effect between the appropriate introduction of iron and nickel selenide.…”

Size-controllable synthesis of NiCoSe2 microspheres as a counter electrode for dye-sensitized solar cells

“…. 6,7 Several low-cost materials with excellent performances, such as alloys, 8,9 transition metal compounds, 4,10,11 carbonaceous materials, 12,13 composites, 14,15 and conductive polymers, 16,17 have been successfully utilized as Pt-free CEs in DSSCs. Among these Pt-free CE materials, metal selenides are competitive candidates because of their outstanding electrocatalytic activity for triiodide reduction.…”

Enhanced Roles of Carbon Architectures in High-Performance Lithium-Ion Batteries

“…Nevertheless, conventional templating methods may result in structural collapse during template-removal treatments, making it difficult to obtain more complicated structures (e.g., yolk-shelled and multi-shelled structures). Hence, a few advanced sacrificial template approaches, such as selftemplating [32][33][34], chemical oxidation [35], and thermal decomposition [36] methods, have been well developed. Typically, self-templated strategies can directly convert templates into hollow structures by controlled etching, outward diffusion, or heterogeneous contraction [37].…”