Cobalt Silicate Research Articles

Lamellar Carbon Composited Cobalt Iron Silicate with a Two-Dimensional Structure Toward Enhanced Electrochemical Properties for Supercapacitors

Transition metal silicates are a potential supercapacitor electrode material due to appreciable theoretical specific capacitance and high energy density. However, the inherent narrow voltage window range and poor conductivity lead to unsatisfactory electrochemical properties. Herein, the carbon composited iron cobalt silicate (denoted as CHOAMFC) with a two-dimensional lamellar structure is designed to enhance the electrical conductivity, where two-dimensional mesoporous silica obtained from montmorillonite was used as the silicon source and template to combine with Fe2+ and Co2+. The CHOAMFC exhibits a specific capacitance of 1008.3 F·g–1 at 0.5 A·g–1 with a long lifespan of 107% after 10 000 cycles. Meanwhile, the assembled hybrid supercapacitor device (CHOAMFC//AC) displays the energy density of 50.9 W h·kg–1 at 275 W·kg–1 as well as excellent cycling stability after 7000 cycles. The great supercapacitor performance is attributed to the uniformly distributed secondary nanosheets on the lamellar substrate that enhance the exposure of sites and the contact with the electrolyte, allowing for easier ion transport. This study explores a strategy of CHOAMFC based on the resource endowment and crystal structure of natural minerals, which provides a feasible idea to obtain two-dimensional layered bimetallic silicate supercapacitor electrode materials with excellent electrochemical performance.

Surface passivation decoration of amorphous cobalt silicate on molybdenum-doped bismuth vanadate for efficient photoelectrochemical water oxidation

Such a subtly strategy greatly promoted the surface holes consumption rate and made composite photoanode dramatically achieve in 2.82 mA /cm2 at 1.23 VRHE (4.7 - fold higher than BiVO4) with a negative onset potential offset of 207 mV. The amorphous Co - species decoration tremendously enhanced surface charge injection efficiency to almost 90 % at 1.23 VRHE. And the biggest photovoltage and lowest charge recombination kinetics of composite photoanode also presented that the amorphous Co species had the potential ability to be passivation layer which were characterized by OCP and IMPS test.

Synthesis of Microporous Cobalt Silicate using Organic Template Derived from 2,6-Dimethylpiperidinium Cations: A Potential Precursor for the Preparation of Double Perovskite Cobalt Materials

Abstract: Synthesis of a microporous cobalt silicate was achieved by using 6,10-dimethyl-5-azoniaspiro[4, 5] decane bromide as structure directing agent. And physicochemical characterization was carried out using XRD, SEM, HTEM, TGA, FT-IR, BET-N2, ICP-OES and EDS. ETS-10 like structure framework was present as a competitive phase. Calcination of the cobalt silicate at 500 oC leads to a new structure. The possibility of this material be cobalt oxide was excluded since Bragg reflections at 2θ = 19.2º; 30.3º; 36.9º; 43.7º; 59.2º were absent (JCPDS#80-1538). Both the indexation of the XRD data for the calcined material which has resulted in a tetragonal unit cell (a = b = 10.39 Å and c = 12.21 Å, α = β = γ = 90°, V= 1317.4 Å3) and HTEM data indicated the cobalt silicate can be used as a precursor for the preparation of double perovskite cobalt materials.

Photothermal Catalytic Reduction of CO2 by Cobalt Silicate Heterojunction Constructed from Clay Minerals

The coupled utilization of solar and thermal energy is considered an efficient way to improve the efficiency of CO2 reduction. Herein, palygorskite (Pal) clay is as a silicon source, while Co2+ is introduced to prepare two-dimensional Co2SiO4 nanosheets, and the excess of Co2+ leads to the growth of Co3O4 on the surface of Co2SiO4 to obtain an S-scheme Co2SiO4/Co3O4−x heterojunction, which facilitates the charge transfer and maintains higher redox potentials. Benefiting from black color and a narrow band gap, the cobalt oxide on the surface can increase the light absorption and produce a local photothermal effect. Under proper thermal activation conditions, the photoelectrons captured by the abundant oxygen vacancies can obtain a secondary leap to the semiconductor conduction band (CB), suppressing the recombination of electron-hole pairs, thus favoring the electron transfer on Co2SiO4/Co3O4−x. The composites not only have abundant oxygen vacancies, but also have a large specific surface area for the adsorption and activation of CO2. The yields of CH3OH on Co2SiO4/Co3O4−5% reach as high as 48.9 μmol·g−1·h−1 under simulated sunlight irradiation. In situ DRIFTS is used to explore the photocatalytic reduction CO2 mechanism. It is found that the thermal effect facilitates the generation of the key intermediate COOH* species. This work provides a new strategy for photothermal catalytic CO2 reduction by taking advantage of natural clay and solar energy.

Boosting the Performance of BiVO4 Photoanodes by the Simultaneous Introduction of Oxygen Vacancies and Cocatalyst via Photoelectrodeposition.

Photoelectrochemical (PEC) water splitting is a promising way to convert solar energy into hydrogen energy, but the efficiency is limited by severe charge recombination especially in photoanodes. Herein, to reduce the charge recombination in the bulk phase and at the surface of the BiVO4 photoanodes, oxygen vacancy introduction and cocatalyst loading were realized simultaneously by one-step photocathode deposition. A unique re-BiVO4/FeOOH photoanode was obtained by the photocathodic reduction of BiVO4 in an electrolyte containing Fe3+, where the oxygen vacancies were introduced during the reduction process and the deposition of the FeOOH cocatalyst on the surface was induced by the generated OH-. When used for PEC water oxidation, the obtained re-BiVO4/FeOOH photoanode achieved an excellent PEC performance with a photocurrent density of 5.35 mA/cm2 at 1.23 V versus RHE under AM 1.5G illumination, which was considerably higher than those for the pristine BiVO4 photoanode (2.88 mA/cm2) and the re-BiVO4 photoanode obtained by photocathodic reduction without Fe3+ (4.32 mA/cm2). After further modification with a cobalt silicate (Co-Sil) cocatalyst, the resultant re-BiVO4/FeOOH/Co-Sil photoanode exhibited a photocurrent density as high as 6.10 mA/cm2 at 1.23 V versus RHE and a remarkable applied bias photon-to-current efficiency of 2.25%. The outstanding performance of the re-BiVO4/FeOOH/Co-Sil photoanode could be attributed to the coexistence of plenty of oxygen vacancies in BiVO4 reducing recombination of photogenerated carriers, the FeOOH cocatalyst interlayer as a hole-transport layer, and the outer Co-Sil cocatalyst with a high activity toward oxygen evolution. This work may open a new avenue toward multifunctional modifications of photoanode systems for efficient solar conversion.

Preparation of pleated flower-like manganese-cobalt-silicate bimetallic electrode materials for supercapacitors

Transition metal silicates (TMSS) have been studied as potential electrode materials for rechargeable batteries and supercapacitors (SCs), and delicate structural design can further enhance the capacity performance and cycling stability of TMSS electrode materials. Herein, a bimetallic doping modulation strategy was employed, and a novel metal-silicate structure was constructed to obtain SC anode materials with excellent electrochemical properties. Manganese cobalt silicate (AMMnCo) with a pleated flower-like structure was obtained by the reaction of Mn2+ and Co2+ with acid-etched montmorillonite (AM) substrates using a simple hydrothermal method. The benign, competitive bimetallic mechanism accelerates the growth of manganese silicate and cobalt silicate on treated montmorillonite (MMT), which results in more folded ion-transport channels on the lamellae and improves the electrochemical properties of the transition-metal silicates. AMMnCo exhibits a higher specific capacitance (979F·g−1/0.5 A·g−1) and better cycling performance (84 %/10,000 cycles) than its monometallic counterparts. Additionally, AMMnCo//AC (where AC is activated carbon), a hybrid supercapacitor (HSC) device, has a high mass specific capacitance and an energy density reaching 13.7 Wh·kg−1 at a power density of 246.9 W·kg−1. Therefore, AMMnCo is a prospective electrode material for high-performance SC applications.

In situ confined vertical growth of Co2.5Ni0.5Si2O5(OH)4 nanoarrays on rGO for an efficient oxygen evolution reaction

Rational design of oxygen evolution reaction (OER) catalysts at low cost would greatly benefit the economy. Taking advantage of earth-abundant elements Si, Co and Ni, we produce a unique-structure where cobalt-nickel silicate hydroxide [Co2.5Ni0.5Si2O5(OH)4] is vertically grown on a reduced graphene oxide (rGO) support (CNS@rGO). This is developed as a low-cost and prospective OER catalyst. Compared to cobalt or nickel silicate hydroxide@rGO (CS@rGO and NS@rGO, respectively) nanoarrays, the bimetal CNS@rGO nanoarray exhibits impressive OER performance with an overpotential of 307 ​mV@10 ​mA ​cm−2. This value is higher than that of CS@rGO and NS@rGO. The CNS@rGO nanoarray has an overpotential of 446 ​mV@100 ​mA ​cm−2, about 1.4 times that of the commercial RuO2 electrocatalyst. The achieved OER activity is superior to the state-of-the-art metal oxides/hydroxides and their derivatives. The vertically grown nanostructure and optimized metal-support electronic interactions play an indispensable role for OER performance improvement, including a fast electron transfer pathway, short proton/electron diffusion distance, more active metal centers, as well as optimized dual-atomic electron density. Taking advantage of interlay chemical regulation and the in-situ growth method, the advanced-structural CNS@rGO nanoarrays provide a new horizon to the rational and flexible design of efficient and promising OER electrocatalysts.

Micro-mechanism of multi-pathway activation peroxymonosulfate by copper-doped cobalt silicate: The dual role of copper

Bimetallic catalysts tend to show excellent catalytic performance to activate peroxymonosulfate (PMS) due to the synergistic effect. Although the outstanding catalytic ability of metal silicates to activate PMS has been clarified for a long time, the synergistic effect and micro-mechanism of bimetal in silicate are still being ignored. In this work, we prepared Cu-doped cobalt silicate (CuCoSi) hollow nanospheres to confirm the synergistic effect of bimetal in silicate for activating PMS. A novel and comprehensive synergistic micro-mechanism at the molecular and electronic levels is proposed. Experimental and theoretical analysis reveals that Co provides unique active sites in CuCoSi and Cu enhances the radical pathway by electron transfer with Co instead of directly participating in the activation of PMS. The increased oxygen vacancies (Ov) in the material promotes the formation of 1O2 due to Cu doping. This work lays a foundation of the development of bimetallic silicates catalysts.

Rational design of double-sandwich-like C@Co,CoO/Co2SiO4/rGO architectures boost electrochemical performances of Co2SiO4 for energy storage devices

• A double-sandwich-like C@Co,CoO/Co 2 SiO 4 /rGO structure with enhanced performance is prepared. • The intimal rGO plays the role of supporting structure and conductive core for Co 2 SiO 4 . • The outer layer C@Co,CoO acts as the protective and conductive carapace for the whole electrode. • C@Co,CoO/Co 2 SiO 4 /rGO achieves the specific capacitance of 360F·g −1 at 0.5 A·g −1 in − 0.4 V ∼ 0.5 V. • C@Co,CoO/Co 2 SiO 4 /rGO delivers super long lifespan with 88 % after 15,000 cycles. The research on developing cobalt silicate (Co 2 SiO 4 )-based materials with high energy and power densities for energy storage devices has sprung up in the field of transition metal silicates (TMSs)-type supercapacitors (SCs). However, the electrochemical performances of the reported Co 2 SiO 4 -based materials are not enough desirable owing to the poor conductivity and narrow voltage ranges originated from the intrinsic shortcomings of Co 2 SiO 4 . Herein, we design a double-sandwich-like composite, C@Co,CoO/Co 2 SiO 4 /rGO/Co 2 SiO 4 /C@Co,CoO (denoted as C@Co,CoO/Co 2 SiO 4 /rGO) architecture, to improve the electrochemical performance of Co 2 SiO 4 , where, reduced graphene oxide (rGO) is inside, both sides of rGO are coated by Co 2 SiO 4 , and carbon@cobalt/cobalt oxide (C@Co,CoO) are formed on the surface of Co 2 SiO 4 . This integrated construction can not only avert the sluggish mass/electron transfer progress caused by the conventional Co 2 SiO 4 , C@Co,CoO and rGO multi-phase mixture system, but also improve the cycle stability by protecting Co 2 SiO 4 from the dissolution and structural collapse during the electrochemical process. As expected, the double-sandwich-like C@Co,CoO/Co 2 SiO 4 /rGO displays promising electrochemical performances. At 0.5 A·g −1 , it achieves the specific capacitance of 360 F·g −1 (324 C·g −1 ) in the potential interval of − 0.4 V ∼ 0.5 V, and super long lifespan with 88 % after 15,000 cycles. Moreover, the hybrid supercapacitor (HSC) device C@Co,CoO/Co 2 SiO 4 /rGO//AC displays the capacitance with 687 mF·cm −2 at 1 mA·cm −2 , energy density with 1.373 Wh·m −2 at 1.5 W·m −2 , and even shows practical application for lightening the LED bulb. This work provides an idea for the preparation of the integrated double-sandwich-like carbon/TMSs/carbon architecture to boost the electrochemical performance of TMSs.

Fabrication of hierarchical flower-shaped cobalt silicate spheres with boosting performance for lithium storage

As a new type of electrode material, transition metal silicates anode has drawn increasing attention owing to high theoretical capacity, sufficient reserves and nontoxicity. Herein, a unique flower-shaped cobalt silicate was fabricated via an alkali-assisted hydrothermal synthesis method, which feathered large specific surface area and abundant meso-pores. Serving as an anode material for lithium ion batteries, the hierarchical CoSiO 2 material exhibited excellent cycling stability (1111 mAh g −1 at 0.1 A g −1 after 200 cycles) and superior rate capability (411 mAh g −1 at 10 A g −1 ). The novel structure of F–CoSiO 2 anode not only provided abundant active sites for electrochemical reactions and effectively facilitated the migration of Li ions during charge-discharge process, but also contributed to the primary pseudocapacitive charge storage behaviors. This work may open up opportunities in structure design and represent the enormous potential of hierarchical transition metal silicate as practical advanced electrode for lithium storage. • A novel flower-shaped CoSiO 2 anode material for lithium ion batteries was designed and fabricated firstly. • The 3D architecture assembled by 2D nanosheets generated large surface area and abundant mesopores. • The hierarchical structure greatly shortened mass diffusion and fascinated the transport of Li ions. • The CoSiO 2 material exhibited remarkable cycling and rate performance.

Boosting Surface Reconstruction for the Oxygen Evolution Reaction: A Combined Effect of Heteroatom Incorporation and Anion Etching in Cobalt Silicate Precatalyst

The Cover Feature illustrates the silicate etching from cobalt silicate towards efficient oxygen evolution reaction. More information can be found in the Article by D. Sarkar et al.

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

Cobalt silicate (CoSi) is a promising electrode material for supercapacitors (SCs) and an electrocatalytic material for the oxygen evolution reaction (OER). How to synthesize cobalt silicate with excellent energy storage and OER properties has not been reported and it is a great challenge for researchers to accomplish it. In this work, we find that the electrochemical properties of CoSi are particularly affected by critical factors during the synthesis process. Three types of CoSi compounds are synthesized using Stöber SiO2 as the self-sacrificing template via a hydrothermal reaction. The CoSi compounds generated from different reaction systems have obvious differences in the macrostate, microscopic morphology, composition and valence, leading to different electrochemical performances for energy storage and OER properties. The findings reveal that the differences (especially valence) among CoSi are determined by the formation of the metal source in the reaction system. The specific capacitance of CoSi-3 obtained from the system with basic salts as the metal source is eight times higher than that of CoSi-1 obtained from the system with coordination compounds as the metal source, whereas CoSi-1 has a greater advantage in electrocatalytic activity. This work provides insight for the synthesis of cobalt silicates applied to energy storage and conversion.

Boosting Surface Reconstruction for the Oxygen Evolution Reaction: A Combined Effect of Heteroatom Incorporation and Anion Etching in Cobalt Silicate Precatalyst

AbstractElectrochemical water splitting is one of the most desirable techniques for combatting the global challenge of sustainable fuel generation. The generation of highly active electrocatalysts for efficient oxygen evolution reaction (OER) requires the rational design of a precatalyst that can enhance the number density of the active catalyst generated during water splitting. In this work, we report sulfurincorporated iron‐doped cobalt silicate (CoFeSiO−S) nanoparticles, which exhibit a unique ability to show gradual improvement in the electrocatalytic behavior with time. The precatalyst could reach a low overpotential of 267±6 mV at benchmark current density of 10 mA/cm2 and 300 mV at 100 mA/cm2 current density after applying chronopotentiometry for 30 h. The exceptional OER performance is further evidence by a low Tafel slope of 37.0±0.5 mV/dec with a very high TOF value of 1.05 s−1. This improved activity is attributed to 1) facilitation of Co2+/Co3+ by Fe doping, 2) faster catalyst activation due to lower metal‐sulfur bond energy compared to metal‐oxygen bond energy, 3) higher pore diameter that enables faster diffusion of reactants and products, 4) lower charge transfer resistance of sulfur incorporated iron‐doped cobalt phyllosilicate than pristine, and 5) silicate anion etching in the electrolyte. This work establishes a fundamental understanding of the surface reconstruction occurring during the OER process where silicates are employed as precatalyst.

The effect of substituting La and Co with Ca and Ti in LaCoO3/KIT-6 on its properties and possible catalytic application in syngas conversion

Perovskite-type samples La1-xCaxCo1-xTixO3/KIT-6 (x = 0–0.5) were synthesized by citrate method. KIT-6 is partially embedded in the perovskite structure. The complete reduction of cobalt in perovskites in the presence of KIT-6 occurs at a temperature of ca. 670 °C due to the formation of a cobalt silicate phase. With the substitution of titanium for cobalt cations, the complete reduction of cobalt occurs at temperatures above 720 °C. The proportion of cobalt that is reduced at temperatures below 500 °C increases with an increase in the ratio of Co3+/Co2+ cations. Partial substitution of cobalt cations with titanium cations decreases the selectivity ratios SCH3OH/SC2+OH and SCH4/SC2-8. The introduction of calcium cations leads, proportionally to its content, to a strong decrease in selectivity to methanol and an increase in selectivity for light hydrocarbons C2-8 in syngas conversion. It was shown that the maximum selectivity for higher alcohols with a low selectivity for methanol is observed at x = 0.3 on a sample containing calcium. A significant amount of the cobalt carbide phase Co2C in the used KIT-6-free sample of LaCoO3 is accompanied by the predominance of the methanation reaction (CH4 selectivity 58.7%). The synthesized samples on KIT-6 have higher selectivity to alcohols compared to a conventional CoAl oxide catalyst and somewhat lower activity in syngas conversion.

Fabrication of Phosphorus-Doped Cobalt Silicate with Improved Electrochemical Properties.

The development of electrode materials for supercapacitors (SCs) is greatly desired, and this still poses an immense challenge for researchers. Cobalt silicate (Co2SiO4, denoted as CoSi) with a high theoretical capacity is deemed to be one of the sustainable electrode materials for SCs. However, its achieved electrochemical properties are still not satisfying. Herein, the phosphorus (P)-doped cobalt silicate, denoted as PCoSi, is synthesized by a calcining strategy. The PCoSi exhibits 1D nanobelts with a specific surface area of 46 m2∙g−1, and it can significantly improve the electrochemical properties of CoSi. As a supercapacitor’s (SC’s) electrode, the specific capacitance of PCoSi attains 434 F∙g−1 at 0.5 A∙g−1, which is much higher than the value of CoSi (244 F∙g−1 at 0.5 A∙g−1). The synergy between the composition and structure endows PCoSi with attractive electrochemical properties. This work provides a novel strategy to improve the electrochemical performances of transition metal silicates.

Surface Reconstruction of Cobalt Species on Amorphous Cobalt Silicate-Coated Fluorine-Doped Hematite for Efficient Photoelectrochemical Water Oxidation.

The slow kinetics of photoelectrochemical (PEC) water oxidation reaction is the bottleneck of PEC water splitting. Here, we report a comprehensive method to improve the PEC water oxidation performance of a hematite (α-Fe2O3) photoanode, that is, fluorine doping and an ultrathin amorphous cobalt silicate (Co-Sil) oxygen evolution reaction (OER) cocatalyst by photo-assisted electrophoretic deposition (PEPD). Detailed investigations reveal that fluorine doping can reduce the interfacial transfer resistance of charge and increase the carrier density to improve the conductivity of hematite. Also, simultaneously, the Co-Sil is used as an excellent OER cocatalyst to accelerate OER kinetics. Specifically, surface reconstruction of cobalt species occurred, and its average oxidation state increased significantly, which was more conducive to water oxidation. In addition, the presence of silicate groups could reduce the OOH* adsorption free energy. The synergistic effect of these efforts significantly reduced the onset potential and overpotential and enhanced the charge separation of the α-Fe2O3 photoanode, resulting in an excellent photocurrent density around 2.61 mA cm-2 at 1.23 V vs RHE (4.75 times higher than the primitive α-Fe2O3). This work provides a feasible strategy for the construction and development of a potential hematite photoanode.

A leaf-like Co-Silicate/CNT hybrid film as free-standing anode for lithium and sodium storage

Electrode materials with high theoretical capacity and high conductivity are critical for high performance rechargeable batteries. Herein, a leaf-like cobalt silicate nanosheet/carbon nanotube (Co-Silicate/CNT) hybrid film is synthesized through a hydrothermal strategy. The Co-Silicate nanosheets provide large accessible surface area and abundant low-coordinated surface atoms with high reactivity. Meanwhile, the Co-Silicate nanosheets are strongly coupled with internally connected CNTs, which afford fast electron transfer and high mechanical stability. Moreover, the open pores can effectively reduce the ion migration distance and alleviate volume changes during charging and discharging cycle. When used as a binder-free anode for LIBs, the Co-Silicate CNT hybrid film exhibits a high initial charge capacity of 846.8 mA h g−1, a good rate performance (1451.3mAhg−1 when reset to 0.1 A g−1 after additional 80 cycles) and excellent cycle performance (331.72mAhg−1 after 1000 cycles at 10 A g−1). As anode materials for sodium storage, it also shows a good rate performance and cycle performance (246.3mAhg−1 after 500 cycles at 1 A g−1). Reaction mechanism analysis reveals that the good performance results from the optimized 3D “branch-leaf” structure and combined effect of capacitance and insertion mechanism. These results indicate that the Co-Silicate/CNT hybrid film has great potential in practical applications as LIB/SIB electrodes.

Bamboo Leaves as Sustainable Sources for the Preparation of Amorphous Carbon/Iron Silicate Anode and Nickel–Cobalt Silicate Cathode Materials for Hybrid Supercapacitors

Bamboo Leaves as Sustainable Sources for the Preparation of Amorphous Carbon/Iron Silicate Anode and Nickel–Cobalt Silicate Cathode Materials for Hybrid Supercapacitors

Activating Inert Sites in Cobalt Silicate Hydroxides for Oxygen Evolution through Atomically Doping

Metal silicate hydroxides have been recognized as efficient oxygen evolution reaction (OER) electrocatalysts, yet tailoring of their intrinsic activity remains confused. Herein, Fe had been incorporated into cobalt silicate hydroxide nanosheets and the resulted material achieves a competitive OER catalytic activity. It is found that the doping state obviously affects the electrical transport property. Specifically, highly dispersed Fe atoms (low‐concentration Fe doping) trigger slight electron transfer to Co atoms while serried Fe (high‐concentration Fe doping) attract vast electrons. By introducing 6 at.% Fe doping, partial relatively inert Co sites are activated by atomically dispersed Fe, bearing an optimal metal 3d electronic occupation and adsorption capacity to oxygen intermediate. The introduced Co−O−Fe unit trigger the π‐donation effect and decrease the number of electrons in π*‐antibonding orbitals, which enhance the Fe−O covalency and the structural stability. As a result, the sample delivers a low overpotential of 293 mV to achieve a current density of 10 mA cm−2. This work clarifies the superiority of atomically dispersed doping state, which is of fundamental interest to the design of doped catalyst.

Synthesis of cobalt silicate nanosheets with mesoporous structure and high surface area as the promising electrode for high-performing hybrid supercapacitor

The construction of electrode materials with novel morphology and structure showing enhanced electrochemical properties have received great attention and always been a task full of challenges and opportunities. Herein, mesoporous cobalt silicate nanosheets (Co2SiO4 NSs) with excellent electrochemical properties are firstly synthesized by the sacrificial template stÖber SiO2 spheres. Thanks to the small diameter and high specific surface area (114 m2 g−1), Co2SiO4 NSs can supply abundant reactive sites where the electrochemical reaction occurs, therefore they can accelerate kinetic process for mass transfer and achieve satisfactory electrochemical performance. The Co2SiO4 NSs show the specific capacitance of 638 F g−1 (319 C g−1) at the current density of 0.5 A g−1, and the capacitance stability after 10000 cycles is 82 % of the initial value. The Co2SiO4//AC hybrid supercapacitor (Co2SiO4//AC HSC) comprising of Co2SiO4-3 NSs and activated carbon (AC) achieves the specific capacitance of 571 mF cm−2 (799 mC cm−2, 81 F g−1) at 1 mA cm−2, the capacitance retention of 92 % after 10000 cycles and the energy density of 1.55 Wh m−2 at the power density of 1.75 W m−2. The device also can light the light emitting diode (LED) bulb in the practical application field. This work firstly presents the in-situ growth of mesoporous Co2SiO4 NSs by sacrificial template stÖber SiO2 spheres with noteworthy electrochemical property for high-performing HSC, which can be popularized to synthesize other transition metal silicates (TMSs) with improved electrochemical properties.