Cobalt silicate: critical synthetic conditions affect its electrochemical properties for energy storage and conversion

Abstract

Cobalt silicate (CoSi) is a promising electrode material for supercapacitors (SCs) and electrocatalytic material for oxygen removal reaction (OER). How to synthesize cobalt silicate with excellent energy storage and OER...

Manipulating the Cobalt Species States to Break the Conversion–Selectivity Trade-Off Relationship for Stable Ethane Dehydrogenation over Ligand-Free-Synthesized Co@MFI Catalysts

“…The main phase of 15–20 wt % Co@MFI was confirmed to be amorphous SiO 2 or/and cobalt silicates (Figure S1b). − …”

Mn‐doping ensuring cobalt silicate hollow spheres with boosted electrochemical property for hybrid supercapacitors

“…Finally, as the reaction goes on, the hollow spheres of CoMnSi are in‐situ prepared employing SiO 2 spheres as a sacrificial template. The chemical reactions in the whole process can be summarized as following 46 : $$${\mathrm{NH}}_{3}\,\cdot \,{{\rm{H}}}_{2}{\rm{O}}\leftrightarrow {\mathrm{NH}}_{4}^{+}+{\mathrm{OH}}^{-},$$$ $$${\mathrm{SiO}}_{2}+2{\mathrm{OH}}^{-}\leftrightarrow {\mathrm{SiO}}_{3}^{2-}+{{\rm{H}}}_{2}{\rm{O}},$$$ $$${\mathrm{Co}}^{2+}+{\mathrm{NH}}_{3}\,\cdot \,{{\rm{H}}}_{2}{\rm{O}}+{\mathrm{Cl}}^{-}\leftrightarrow \text{Co}(\text{OH})\text{Cl}+{\mathrm{NH}}_{4}^{+},$$$ $$$2\mathrm{Co}(\mathrm{OH})\mathrm{Cl}+{\mathrm{SiO}}_{3}^{2-}\leftrightarrow {\mathrm{Co}}_{2}{\mathrm{SiO}}_{4}+2{\mathrm{Cl}}^{-}+{{\rm{H}}}_{2}{\rm{O}},$$$ $$${\mathrm{Mn}}^{2+}+2{\mathrm{NH}}_{3}\,\cdot \,{{\rm{H}}}_{2}{\rm{O}}\leftrightarrow {\mathrm{Mn}(\mathrm{OH})}_{2}+2{\mathrm{NH}}_{4}^{+},$$$ …”

“…The ratio of Co/Mn is about 14/1 by XPS and ICP (Supporting Information: Table S1), suggesting that the Mn in the CoSi is smaller than that in the recipe (9/1). In O1s fitted spectrum (Figure 2B), the binding energies of 532.4 and 531.5 eV are assigned to Si‐O and Mn‐O/Co‐O, 46 respectively. Figure 2C depicts the high‐resolution Mn2p spectrum of CoMnSi, which contains three obvious peaks of Mn2p 1/2 (654.1 eV) and Mn2p 3/2 (642.3 eV) with a satellite peak (646.0 eV) 50 .…”

Silica‐Derived Nanostructured Electrode Materials for ORR, OER, HER, CO2RR Electrocatalysis, and Energy Storage Applications: A Review**

“…[146] Cobalt silicate can also be synthesized via a template-free method [209] as composites including FeOOH@silica [210] and cobalt silicates. [211] Silica has a theoretical capacity of 1965 mA h g À 1 which is higher than many reported nanomaterials such as carbon. [173,212] Transition metal ions and their metal oxides can be used to improve the conductivity and electrochemical performance of silicate materials.…”

“…The presence of the Si−O−C bond of rice husks as a SiO 2 source enhances the charge transfer at the electrochemical interface during energy storage as supercapacitors [146] . Cobalt silicate can also be synthesized via a template‐free method [209] as composites including FeOOH@silica [210] and cobalt silicates [211] …”