Transition Metal Sulfides Research Articles

Electronic structure, optical properties and defect induced half-metallic ferromagnetism in kagome Cs2Ni3S4

Recent research focuses on electronic structure of kagome materials due to their fascinating properties such as topological insulators, Dirac semimetals, and topological superconductors. Materials with sizable electronic band gap are found to play vital role in device applications. Here, by means of density functional theory calculations, we study the electronic and optical properties of ternary transition metal sulphide Cs2Ni3S4 by using the full potential local orbital code. Standard generalized gradient approximation (GGA) has been employed to consider the electron exchange and correlation effect, and modified Becke–Johnson (mBJ) potential has been used to obtain the accurate band gap of the material. From our electronic structure calculations Cs2Ni3S4 is found to be nonmagnetic semiconductor with an indirect band gap of ∼1.4 eV within GGA + mBJ calculations. The structural analysis demonstrates that Ni atoms form a kagome lattice in a two-dimensional plane, resulting in the presence of a dispersionless flat band located below the Fermi energy. From the optical calculations, analyzing the dielectric function, loss function, and optical conductivity, Cs2Ni3S4 is found to be optically active in the visible as well as lower ultraviolet energy ranges. This suggests that Cs2Ni3S4 may be a suitable candidate for the opto-electronic devices. Additionally, this work may provides a foundation for the development of opto-electronic device and a framework for experimental work. We additionally investigated the effect of vacancy defects in Cs2Ni3S4 to see it’s influence on the electronic and magnetic properties. Interestingly, the Cs-vacancy defect give rise to half-metallic ferromagnetism with an effective magnetic moment of per unit cell.

Transition-metal sulfides with excellent hydrogen and oxygen reactions: A mini-review

In order to create sustainable, environmentally friendly energy systems, the Hydrogen Evolution Reaction and Oxygen Evolution Reaction must be prioritized. Transition metal sulfides (TMSs) have been studied extensively as catalysts for both HER and OER because of their high activity, cheap cost, and availability. However, its low stability and conductivity limit its usefulness. Recent research efforts have focused on developing TMS-based nanocomposites, which combine the advantageous properties of TMSs with those of other materials, in order to overcome these concerns. The latest advances in TMS-based nanocomposites for oxygen reduction reaction and hydrogen reduction reaction are outlined in this article. We begin by discussing the broad concepts of HER and OER and the problems of TMSs in these reactions. We have comprehensively addressed the role of Sulfur atoms in electrocatalytic water splitting. We also emphasize the need to improve the contact between TMSs and other materials to enable effective charge transfer. Lastly, we evaluate the performance of TMS-based nanocomposites in HER and OER and compare their activity to that of other cutting-edge catalysts. We also examine the remaining research problems and potential in this subject. TMS-based nanocomposites show significant potential for practical applications of HER and OER in renewable energy systems.

Core-Shell Structure Trimetallic Sulfide@N-Doped Carbon Composites as Anodes for Enhanced Lithium-Ion Storage Performance.

The high specific capacity of transition metal sulfides (TMSs) opens up a promising new development direction for lithium-ion batteries with high energy storage. However, the poor conductivity and serious volume expansion during charge and discharge hinder their further development. In this work, trimetallic sulfide Zn-Co-Fe-S@nitrogen-doped carbon (Zn-Co-Fe-S@N-C) polyhedron composite with a core-shell structure is synthesized through a simple self-template method using ZnCoFe-ZIF as precursor, followed by a dopamine surface polymerization process and sulfidation during high-temperature calcination. The obvious space between the internal core and the external shell of the Zn-Co-Fe-S@N-C composites can effectively alleviate the volume expansion and shorten the diffusion path of Li ions during charge and discharge cycles. The nitrogen-doped carbon shell not only significantly improves the electrical conductivity of the material, but also strengthens the structural stability of the material. The synergistic effect between polymetallic sulfides improves the electrochemical reactivity. When used as an anode in lithium-ion batteries (LIBs), the prepared Zn-Co-Fe-S@N-C composite exhibits a high specific capacity retention (966.6 mA h g-1 after 100 cycles at current rate of 100 mA g-1) and good cyclic stability (499.17 mA h g-1 after 120 cycles at current rate of 2000 mA g-1).

ZnS-embedded porous carbon for peroxydisulfate activation: Enhanced electron transfer for bisphenol A degradation

Transition metal sulfides have garnered increasing attention for their role in persulfate activation, a crucial process in environmental remediation. However, the function of metal sulfides without reversible valence changes, such as ZnS, remains largely unexplored in this context. Here we report ZnS-embedded porous carbon (ZnS-C), synthesized through the pyrolysis of Zn-MOF-74 and dibenzyl disulfide. ZnS-C demonstrates remarkable activity in activating peroxydisulfate (PDS) across a wide pH range, enabling the efficient mineralization removal of bisphenol A (BPA). Through electrochemical investigation and theoretical simulations of charge density distributions, we unveil that the electron transfer from BPA to PDS mediated by the ZnS-C catalyst governs the reaction. This study, both in theory and experiment, demonstrates metal sulfide as electron pump that enhances electron transfer efficiency in PDS activation. These findings redefine the role of metal sulfide catalysts, shedding new light on their potential for regulating reaction pathways in PDS activation processes.

Preparation of 1 T-WS2 under different conditions and its enhancement of Fe(III)/Fe (II) cycle, synergistic catalysis of PMS activation and degradation of organic pollutants

In the Fenton-like system, the activation of sulfate-based AOPs (advanced oxidation processes) is inhibited by the slow conversion of Fe(III) to Fe(II). WS2 and other transition metal sulfides has good reducibility and can promote the conversion of Fe(III) to Fe(II), thus having excellent co-catalytic effect. However, the degradation effects of WS2 in different crystal phases are also different. In this paper, WS2 with different 1 T phase content was prepared under different conditions. The co-catalytic performance of WS2 in the WS2/Fe3+/PMS (peroxymonosulfate) system was further studied. When WCl6/TAA = 1: 12 and the temperature was 200 °C, WS2 had the best co-catalytic effect. 1 T phase WS2 was verified by XRD, Raman and TEM. XPS showed that the content of 1 T phase was the highest in W-200. The WS2/Fe3+/PMS system could efficiently degrade 20 mg/L phenol solution within 20 min. Free radical capture experiments and ESR showed that·SO4-,·OH,·O2- were the main active radicals. The excellent reusability of the 1 T-WS2 was proved by recycling experiments and the generation of sulfur vacancies. The system can be widely applied to the degradation of RhB, OFX and other pollutants. The degradation of different pollutants by WS2 in different oxidation systems was studied.

Rapid microwave preparation of CuS/ZnCdS Z-scheme heterojunction for efficient photocatalytic hydrogen evolution

Low-cost transition metal sulfides have been shown to be ideal candidates for photocatalytic hydrogen evolution. However, most preparation processes have long reaction times and high energy consumption. In this work, CuS/ZnCdS heterojunction was prepared by a rapid and energy-saving microwave method. It was characterized by SEM, TEM, XRD, XPS, and photoelectrochemical tests. The results showed that CuS was successfully loaded with ZnCdS and did not alter the intrinsic structure of ZnCdS. It not only improved the light absorption efficiency, but lowered the position of the conduction band and reduced the forbidden band width. The optimum photocatalytic hydrogen evolution rate of CuS/ZnCdS could get 7.58 mmol g−1 h−1 and the AQE was 10.07% at 420 nm. The enhanced photocatalytic activity can be attributed to the construction of Z-scheme heterojunction to promote the separation and transfer of photogenerated charges. This work provides a valuable route to explore high quality ZnCdS based photocatalysts using a fast, low-cost microwave technique.

Hierarchical FeS2 cathode with suppressed shuttle effect for high performance magnesium-ion batteries

2D transition metal sulfides (such as FeS2) are promising cathode materials for magnesium-ion batteries due to their high capacity, low cost, and abundance. However, unexpected side effects of the electrochemical process result in poor cycling performance, which hamper their widespread use. Herein, we demonstrate the shuttle effects of metal sulfide cathodes in magnesium-ion batteries for the first time and propose a strategy of phase engineering to retard such side effects, improving the magnesium storage performance of the FeS2 cathode. We also show the correlation between structure evolution of FeS2 and electrochemical performance using cryogenic transmission electron microscopy, time-of-flight secondary ion mass spectrometry and X-ray diffraction. The stress caused by the magnesiation-induced expansion of FeS2 is shown to be alleviated in porous hierarchical spheres, which has been verified by finite element simulations. This boosts the electrochemical performance of FeS2, with a respectable capacity of 556 mAh g−1 maintained after 80 cycles at 25 mA g−1. Our results can guide the use of other metal sulfides in magnesium-ion batteries.

High-performance of the ZnO/NiS nanocomposite electrode materials for supercapacitor

In this work, a single transition metal oxide (ZnO) and metal sulfide (NiS) synthesized through a hydrothermal method and their combination of composite materials have been successfully prepared a simple and an easy approch a solid-state method. As the synthesized composite (ZnO/NiS) prepared different percentage ratio such as 7:3, 5:5 and 3:7 respectively. The ZnO, NiS and their nanocomposite materials characterized by using the XRD, SEM, HR-TEM, XPS and EDAX analysis. The electrochemical performance of as prepared electrode materials analyzed by CV, GCD and EIS spectra. The synthesized nanocomposite of ZnO/NiS at 5:5 ratio exhibited the brilliant capacitance of 1322 Fg−1 at 1 Ag−1 current density, capacitance retention of 76.66 % for continuous 1000 cycles at 4 Ag−1 and also calculated the power and energy density. These results suggests the ZnO/NiS at 5:5 ratio electrode is favorable electrode for an excellent performance supercapacitor.

Defect-rich MoS2/CoS2 on Mo2TiC2Tx MXene as an efficient catalyst for hydrogen evolution reaction in acidic media

Electrocatalytic hydrogen production is an effective way to produce hydrogen energy, and the key is to find inexpensive and effective catalysts. Loading transition metal sulfides onto two-dimensional transition metal carbide (MXene) is an effective method to prepare cheap and high-performance hydrogen evolution reaction (HER) catalysts. In this study, Mo2TiAlC2 was etched with hydrofluoric acid to prepare Mo2TiC2Tx MXene, which was then composited with MoS2 and CoS2 to prepare defect-rich MoS2/CoS2@Mo2TiC2Tx composite by a hydrothermal method. MoS2/CoS2 provides a large number of active sites for electrocatalysis, while Mo2TiC2Tx MXene as a carrier not only provides nucleation and growth sites for MoS2/CoS2, but also increases the rate of electron transfer in HER process, which achieves good synergy between MoS2/CoS2 and Mo2TiC2Tx MXene. Consequently, MoS2/CoS2-2@Mo2TiC2Tx exhibits an excellent HER performance. When the current density reaches 10 mA cm−2, the optimal MoS2/CoS2-2@Mo2TiC2Tx catalyst only requires an overpotential of 80 mV, and exhibits good cycling stability and durability. This work gives a new idea for the preparation of efficient HER catalysts using non-precious metal composites to replace the precious Pt/C.

One-step synthesis of SnS2/SnO2 nanoflowers for high-performance hybrid supercapacitors

In this work, the flower-like SnS2/SnO2 (nanoflowers, NFs) composite and SnS2 nanosheets (NSs) were respectively prepared in the presence of different amount of thiourea through a facile one-step hydrothermal method. These SnS2/SnO2 NFs and SnS2 NSs exhibited the typical battery-like electrochemical response. At the current load of 1 A g−1, the specific capacity was determined to be 304.6 C g−1 for NFs composite and 244.1 C g−1 for NSs. In order to evaluate the potential of practical application in electrochemical energy storage, a hybrid supercapacitor (HSC) was assembled with these SnS2-based electrode materials as cathode and activated carbon (AC) as anode, and the HSC could be operated over a maximum voltage of 1.6 V. The SnS2/SnO2 NFs//AC HSC delivered an energy density of 33.4 W h kg−1 at the power density of 993.2 W kg−1. In contrast, the SnS2 NSs//AC HSC exhibited 27.4 W h kg−1 at 929.9 W kg−1. Both HSCs showed good cycling performance during the continuous 5000 GCD cycles without any capacity decay. This impressive electrochemical property proves that the SnS2/SnO2 NFs composite can serve as promising electrode material for the assembly of advanced HSC device. In addition, the present synthetic strategy can be extended to the synthesis of other transition metal sulfides (TMSs)-based electrode materials with controllable shapes and excellent electrochemical response.

Catalytic effect of double transition metal sulfide NiCo2S4 on hydrogen storage properties of MgH2

The limited practicality of magnesium hydride (MgH2) is due to its remarkable thermodynamic steadiness and sluggish hydrogen (H2) storage rate. In this study, NiCo2S4, a double transition metal sulfide, was synthesized and used to promote the kinetic properties of MgH2. Starting release temperature of MgH2- 10 NiCo2S4 composite is 203 °C. MgH2-10 NiCo2S4 composite releases 6.11 wt% H2 in 5 min at 325 °C, and absorbs 5.54 wt% H2 in 1 min at 150 °C. Besides, the Arrhenius equation yields the activation energy (Ea) of MgH2-10 NiCo2S4 composite to be 86.50 ± 2.00 kJ/mol. It is noteworthy that the MgH2-10 NiCo2S4 composite generated MgS, Mg2Ni and Mg2Co in situ active species during the first dehydrogenation process. The synergistic effect between the MgS, Mg2Ni/Mg2NiH4 and Mg2Co/Mg2CoH5 multiphase catalytic systems was generated in the cycle, which observably boosted the kinetics of Mg/MgH2.

High-performance energy storage hybrid supercapacitor device based on NiCoS@CNT@graphene composite electrode material

The novel asymmetric supercapacitor, sometimes referred to as a ‘supercapattery,’ merges the favourable attributes of batteries, such as high energy density, with the exceptional cycle life and specific power of supercapacitors (SCs). In this study, carbon nanotubes and graphene were physically mixed with nickel cobalt sulfide (NiCoS), which was produced using a hydrothermal method. Using both a three-electrode and a two-electrode arrangement, the material’s electrical properties were carefully examined. The NiCoS@CNT@graphene composite exhibited a striking specific capacity (Qs) of 1814 C g−1 at 2 Ag−1, within the three-electrode system. The NiCoS@CNT@graphene//AC composite hybrid device revealed outstanding Qs of 190 Cg−1 at 2 Ag−1. Additionally, this material demonstrated an exceptional power density (Pd) of 2000 W kg−1 and a noteworthy Ed of 40.5 Wh Kg−1. The nanocomposite electrode showed remarkable capacity retention (CR ∼ 88%) after 5000 cycles, which was one of its most notable features, highlighting its long-term stability and potential for extensive usage. A viable strategy includes mixing transition metal sulfides with conductive carbon-based nanomaterials to produce high-performance energy storage devices with surpassed capabilities.

Amorphous bimetallic polysulfide for all-solid-state batteries with superior capacity and low-temperature tolerance

Transition-metal sulfides with high capacity and low cost have been widely acknowledged as promising cathode candidate for all-solid-state batteries (ASSBs). However, the solid-solid conversion reaction mechanism based on ordered crystal structures and the high concentration of metal element result in sluggish reaction kinetics and sacrificed specific capacity. Herein, an amorphous bimetallic polysulfide (Mo0.5Ti0.5S4) is designed to create abundant reaction sites, improve diffusion kinetics and attain sulfur-equivalent capacity. As a result of the decreased elastic modulus through the introduction of Ti, the amorphization of crystalline MoS2 is accelerated during ball milling. Compared with its counterpart (MoS4, 757 mAh g−1), Mo0.5Ti0.5S4 ASSB delivers a much higher reversible capacity (914 mAh g−1), thanks to the abundant reaction sites and suppressed S/Li2S separation from amorphous Mo-Sx matrix. Moreover, due to the improved diffusion kinetics and pseudocapacitive contribution, the capacity retention of Mo0.5Ti0.5S4 at 4 C current rate increases from 47.2 % to 65.8 %. In addition, Mo0.5Ti0.5S4 shows excellent low-temperature performances, including good long-term cycle stability and rate capability (with a capacity retention of 50.5 % at 0.5 C) at −20 ℃, and increased capacity retention (from 35.1 % to 50.7 %) at −40 ℃. Therefore, Mo0.5Ti0.5S4 with bimetallic amorphous structure and enriched sulfur anions has enormous potential on high-rate and low-temperature ASSB applications.

Efficient One-Step Synthesis of a Pt-Free Zn0.76Co0.24S Counter Electrode for Dye-Sensitized Solar Cells and Its Versatile Application in Photoelectrochromic Devices.

In this study, we synthesized a ternary transition metal sulfide, Zn0.76Co0.24S (ZCS-CE), using a one-step solvothermal method and explored its potential as a Pt-free counter electrode for dye-sensitized solar cells (DSSCs). Comprehensive investigations were conducted to characterize the structural, morphological, compositional, and electronic properties of the ZCS-CE electrode. These analyses utilized a range of techniques, including X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The electrocatalytic performance of ZCS-CE for the reduction of I3- species in a symmetrical cell configuration was evaluated through electrochemical impedance spectroscopy and cyclic voltammetry. Our findings reveal that ZCS-CE displayed superior electrocatalytic activity and stability when compared to platinum in I-/I3- electrolyte systems. Furthermore, ZCS-CE-based DSSCs achieved power conversion efficiencies on par with their Pt-based counterparts. Additionally, we expanded the applicability of this material by successfully powering an electrochromic cell with ZCS-CE-based DSSCs. This work underscores the versatility of ZCS-CE and establishes it as an economically viable and environmentally friendly alternative to Pt-based counter electrodes in DSSCs and other applications requiring outstanding electrocatalytic performance.

Defect and Donor Manipulated Highly Efficient Electron-Hole Separation in a 3D Nanoporous Schottky Heterojunction.

Given the rapid recombination of photogenerated charge carriers and photocorrosion, transition metal sulfide photocatalysts usually suffer from modest photocatalytic performance. Herein, S-vacancy-rich ZnIn2S4 (VS-ZIS) nanosheets are integrated on 3D bicontinuous nitrogen-doped nanoporous graphene (N-npG), forming 3D heterostructures with well-fitted geometric configuration (VS-ZIS/N-npG) for highly efficient photocatalytic hydrogen production. The VS-ZIS/N-npG presents ultrafast interfacial photogenerated electrons captured by the S vacancies in VS-ZIS and holes neutralization behaviors by the extra free electrons in N-npG during photocatalysis, which are demonstrated by in situ XPS, femtosecond transient absorption (fs-TA) spectroscopy, and transient-state surface photovoltage (TS-SPV) spectra. The simulated interfacial charge rearrangement behaviors from DFT calculations also verify the separation tendency of photogenerated charge carriers. Thus, the optimized VS-ZIS/N-npG 3D hierarchical heterojunction with 1.0 wt % N-npG exhibits a comparably high hydrogen generation rate of 4222.4 μmol g-1 h-1, which is 5.6-fold higher than the bare VS-ZIS and 12.7-fold higher than the ZIS without S vacancies. This work sheds light on the rational design of photogenerated carrier transfer paths to facilitate charge separation and provides further hints for the design of hierarchical heterostructure photocatalysts.

An extensive exploration of non-conventional sources for preparing NiS and its potential applications in battery and photodegradation processes

In this study, we explore the synthesis of transition metal sulphide nanoparticles, focusing on the effects of different fabrication methods on their morphology and performance. We compare the single source method (S-M) and multisource method (M-M) precursors to understand their contrasting properties. Through comprehensive characterization using PXRD, EDX, SEM, TEM, HRTEM, and XPS, we analyze the resulting nanomaterials. Electrochemical performance is evaluated for NiS nanoparticles produced via the S-M method, specifically in the context of Li/Li+ batteries. Additionally, we assess the photocatalytic activity of both materials across the entire spectrum for dyes such as methyl violet, malachite green, methylene blue, and rhodamine B. Our findings indicate that the S-M method yields nanomaterials with a larger external surface area, leading to superior photocatalytic activity compared to the M-M method. These results highlight the substantial influence of the fabrication method on the final morphology and performance of the synthesized nanomaterials.

Ni3S2/Ni2O3 heterojunction anchored on N-doped carbon nanosheet aerogels for dual-ion hybrid supercapacitors

As a member of transition metal sulfides, Ni3S2 has been reported as one type of the effective pseudocapacitive electrode materials for supercapacitors, due to its good electrical conductivity and high electrochemical activity. To further improve the energy density of the Ni3S2-based supercapacitors, we propose a novel approach to the Ni3S2/Ni2O3 heterojunction anchored on N-doped carbon nanosheet aerogels (Ni3S2/Ni2O3@N-CNA), which is used as the cathode for Zn-ion hybrid supercapacitors with the dual-ion electrolytes. The Ni3S2/Ni2O3@N-CNA samples can be prepared through the bubble-templated polymerization of pyrrole and the carbonization of the polypyrrole nanosheet hydrogel/Ni2+. The Ni3S2/Ni2O3@N-CNA cathode is immersed into the Li-ion catholyte for Li+ storage, while the Zn foil anode is immersed into the Zn-ion anolyte for Zn2+ storage. Electrochemical kinetic analysis of the dual-ion hybrid supercapacitor indicates its evident capacitance characteristic. Additionally, theoretical calculations reveal that the Ni3S2/Ni2O3 heterojunction can facilitate the adsorption and dehydration of a hydrated Li+ ion to further play a great role in the enhancement of pseudocapacitance. Based on the novel strategy of the alkaline dual-ion electrolytes, this dual-ion hybrid supercapacitor with the high energy density (64.2 Wh kg−1) opens up a new avenue to develop high-performance Zn-ion hybrid supercapacitors.

Fabrication of binder-free mixed sulphide/PANI nanocomposite based electrode for supercapacitor application

In a pursuit to satisfy the rising energy demand, researchers to create novel, environmentally safe electrode materials for several energy storage devices. The electrochemical performance could be compromised as a result of the polymer binders employed in the electrode coating procedure. Binder-free electrode materials accelerate electron transport pathways by providing enough room to accommodate the active material's large volume changes during charging and discharging. Lower electronegativity of sulphur compared to oxygen provides increased flexibility in the structure of transition metal sulphides which makes them stand out as the promising candidates in the search for innovative electrode materials. Likewise, although PANI possess high conductivity and specific capacitance, it's ineffective to be used in the purest form for practical applications owing to its inability to retain the capacitance when it undergoes multiple charging/discharging cycles. In this work, we describe the development of binder-free Cu-Mn mixed sulphide and its nanocomposite with PANI on carbon fibre paper (CP) substrates. Characterization techniques such as XPS, FE-SEM along with elemental mapping helped in understanding the successful formation of the nanocomposite. In contrast to pure PANI and Cu-Mn mixed sulphide at the same current density in a neutral 1 M Na2SO4 electrolyte, the composite of Cu-Mn mixed sulphide and PANI demonstrated an enhanced areal capacitance of 550.95 mF cm−2 at 1 mA cm−2. Incorporating PANI with Cu-Mn mixed sulphides has not only improved their capacitance but also reduced the rate at which pristine PANI's capacitance degrades when subjected to a greater number of charge/discharge cycles which is reflected in the enhanced capacity retention property of the nanocomposite, wherein the composite maintained 99.02% of its original capacitance at a current density of 10 mA cm−2 than of pure PANI on CP substrates.

First-principles study on a promising intrinsic d0f0-type half-metallic nanosheet LaS2 with high Curie temperature

Two-dimensional transition-metal sulfides (2D-TMS) have caused great attention due to their possible high Curie temperature and promising application in spintronics. However, few half-metallic 2D-TMS have been found so far. In this paper, based on the first-principles calculation, a promising intrinsic d0f0-type half-metallic 2D-TMS LaS2 with high Curie temperature and the ferromagnetic ground state was predicted. Its primitive magnetic moment is 1.00 μB, which origins mainly from the S-ions. In a strain range from −5% to +5%, its half-metallic character remains stable. Its half-metallic stability may be improved the tensile strains, absorption of Cl/F atoms bilaterally and charge states, respectively. After Cl/F atoms absorb on surface of this nanosheet bilaterally, its primitive magnetic moment may be raised up to 3.00 μB. With the increase of positive charge states, its magnetic moments are also raised. Thus, the absorption of Cl/F atoms and charged states both evidently improve the magnetic properties of this nanosheet. The calculated magnetic moments agree well with those analyzed by the molecular orbital theory.

Cobalt sulfide nanosheets synthesized by anion exchange method for efficient Hg0 removal from flue gas

Transition metal sulfide adsorption has been recognized as a potential method for Hg0 removal, and the physicochemical properties of the adsorbent can significantly affect the Hg0 removal efficiency. The nanosheet structure with abundant unsaturated surface atoms can result in lower mass transfer resistance and give more adsorption sites. Thus, in the present work, cobalt sulfide nanosheet adsorbents with different Co/S ratio were synthesized by anion exchange method. Characterization results show that CS-10 has the lowest crystallinity and the highest Co3+/Co2+ and S22−/S2− ratio. These results give CS-10 the best Hg0 removal efficiency of nearly 100 % at a high GHSV of 180 000 h−1 at 60 °C. In addition, CS-10 has a good resistance to SO2 whose Hg0 removal efficiency decrease after SO2 introduction but recover to original level after SO2 cutting off. After being impregnated in Na2S solution, the adsorption efficiency of the used CS-10 can be easily regenerated. XPS results show that HgS can resolve in Na2S solution via HgS(ad) + S2− → [HgS2]2−. Furthermore, Co3+ and S22− as the main active sites for Hg0 removal can be replenished during the impregnation in Na2S solution. Kinetic study points that Hg0 adsorption characteristics on CS-10 obey pseudo-first-order and pseudo-second-order kinetic models, suggesting that the Hg0 diffusion on the external surface and the reaction at the adsorption site can both influence the Hg0 removal process.