High Electrochemical Performance Research Articles

Ultrarapid Nanomanufacturing of High-Quality Bimetallic Anode Library toward Stable Potassium-Ion Storage.

Bimetallic alloy nanomaterials are promising anode materials for potassium-ion batteries (KIBs) due to their high electrochemical performance. The most well-adopted fabrication method for bimetallic alloy nanomaterials is tube furnace annealing (TFA) synthesis, which can hardly satisfy the trade-off among granularity, dispersity and grain coarsening due to mutual constraints. Herein, we report a facile, scalable and ultrafast high-temperature radiation (HTR) method for the fabrication of a library of ultrafine bimetallic alloys with narrow size distribution (≈10-20 nm), uniform dispersion and high loading. The metal-anchor containing heteroatoms (i.e., O and N), ultrarapid heating/cooling rate (≈103 K s-1 ) and super-short heating duration (several seconds) synergistically contribute to the successful synthesis of small-sized alloy anodes. As a proof-of-concept demonstration, the as-prepared BiSb-HTR anode shows ultrahigh stability indicated by negligible degradation after 800 cycles. The in situ X-ray diffraction reveals the K+ storage mechanism of BiSb-HTR. This study can shed light on the new, rapid and scalable nanomanufacturing of high-quality bimetallic alloys toward extended applications of energy storage, energy conversion and electrocatalysis.

Ultrarapid Nanomanufacturing of High‐Quality Bimetallic Anode Library toward Stable Potassium‐Ion Storage

AbstractBimetallic alloy nanomaterials are promising anode materials for potassium‐ion batteries (KIBs) due to their high electrochemical performance. The most well‐adopted fabrication method for bimetallic alloy nanomaterials is tube furnace annealing (TFA) synthesis, which can hardly satisfy the trade‐off among granularity, dispersity and grain coarsening due to mutual constraints. Herein, we report a facile, scalable and ultrafast high‐temperature radiation (HTR) method for the fabrication of a library of ultrafine bimetallic alloys with narrow size distribution (≈10–20 nm), uniform dispersion and high loading. The metal‐anchor containing heteroatoms (i.e., O and N), ultrarapid heating/cooling rate (≈103 K s−1) and super‐short heating duration (several seconds) synergistically contribute to the successful synthesis of small‐sized alloy anodes. As a proof‐of‐concept demonstration, the as‐prepared BiSb‐HTR anode shows ultrahigh stability indicated by negligible degradation after 800 cycles. The in situ X‐ray diffraction reveals the K+ storage mechanism of BiSb‐HTR. This study can shed light on the new, rapid and scalable nanomanufacturing of high‐quality bimetallic alloys toward extended applications of energy storage, energy conversion and electrocatalysis.

Insight into use of biopolymer in hybrid electrode materials for supercapacitor applications—A critical review

The shortage of natural resources due to the progression of the human population and environmental pollution has become crucial concern topics to resolve. One of the best ways to resolve this is to develop renewable energy-based storage systems. Supercapacitors are emerging as promising storage systems via providing rapid charging/discharging and high power delivery, but there is a need to explore low-cost, environment-friendly, non-toxic, abundant, and biodegradable electrode materials for supercapacitors. In this regard, biopolymers are observed to be popular for storage applications as they are of high porosity, cost-effective, easily available, low-weight, and environment friendly and have biodegradability properties. The biopolymer-based electrode has a desirable morphology and high surface area and exhibits admirable electrochemical properties. The focus of this report is to highlight (i) the inclusive details of supercapacitors and their types along with strategies to improve their electrochemical performance, (ii) biopolymers and their types used for supercapacitor applications, (iii) various synthesis routes that could be adopted for designing electrode materials based on biopolymers for supercapacitors, and (iv) challenges and future scope of biopolymers as the electrode material in supercapacitor applications. The detailed study here in this report is found to be a topic of interest for the scientific community to fabricate and prepare low-cost, eco-friendly, high electrochemical performance exhibiting electrode materials for supercapacitor applications.

The utilization of wasted gelatin as an effective binder for a flexible anode membrane

Nowadays, the bendable lithium-ion battery has been an important power source for current smart electrical devices. This requires an effectively free-standing flexible electrode membrane that conveys high electrochemical performance, while capable of great flexibility. One of thekeycomponents to promote bendable fabrication is the functionalized binders that should be compatible with the electrode materials and strongly hold the cell structure. Recently, the rapid growth of the pharmaceutical andhealthcareindustries has left tons of gelatin waste. Regarding itsmulti-carboxy and amino functional groups, it can be expected to serve as a promising binding agent for the electrode material. Currently, TiO2has been widely applied as the potential anode material providing high stability for lithium-ion battery. Hence, this work is aimed to fabricate the free-standing flexible anode membranes for lithium-ion batteries by using TiO2nanosheets as the high specific surface area active material in conjunction with the gelatin based-binder. The TiO2nanosheets were prepared viaahydrothermal process and then composited with carbon nanotubes to increase their conductivity. Meanwhile, the waste gelatin was modified to become a polymerizable substrate for being a functional binder holding the flexible membrane. Material characterization results revealed the successful formation of the anatase TiO2nanosheets and the functionalized gelation-derived binder. The electrochemical performance of the proposed composite anode membrane showed a superior specific capacity over the sameTiO2-basedcomposite anode butemployingthe typical Polyvinylidene Fluoride (PVDF). For instance, the average specific capacities after running for 100 cycles are approximately 149 and 97 mAhg−1for the anode membrane using gelatin-based and PVDF binder, respectively. Usingagelatin-based binder dose not onlyenhancethe electrochemical performance of the electrode membrane but also reduces chemical pollution and waste to the environment.

Synergetic optimization of p-type Ba2+ substitution and carbon nanotubes enwrapping in Na3V2(PO4)3: A superior cathode with high electrochemical and safety performance for half and full cells

Na3V2(PO4)3 (NVP) has been deemed as a promising cathode because of high capacity and good stability. Nevertheless, poor intrinsic conductivity seriously limits its further application. Herein, partial Ba2+ substitution on V3+ site is introduced to modify NVP in terms of increasing cell volume due to larger ionic radius of Ba2+ and generating beneficial hole carriers derived from p-type doping. The expanded crystal channels efficiently facilitate the Na + migration and the hole carriers are beneficial for transfer charge to improve electronic conductivity. Ba2+ doping further enhances the structural stability due to the pillar effect, which has been proved by DSC measurement. The increase of exothermic peak temperature and decrease of heat release rate demonstrates the excellent thermal stability of NVBa0.07P@CNTs. Moreover, disordered carbon layer and enwrapped CNTs construct an effective network to provide abundant routes for electronic transportation. Notably, the optimized NVBa0.07P@CNTs delivers superior electrochemical performance in both half and full cells. It releases a capacity of 117.23 mA h g−1 at 0.1C and submits a capacity of 101.99 mA h g−1 with retention of 80% at 15 C over 2000 cycles. Even at 50 C, it still delivers a high value of 78.33 mA h g−1.

One-step-one-pot hydrothermally derived metal-organic-framework-nanohybrids for integrated point-of-care diagnostics of SARS-CoV-2 viral antigen/pseudovirus utilizing electrochemical biosensor chip

The COVID-19 pandemic has become a global catastrophe, affecting the health and economy of the human community. It is required to mitigate the impact of pandemics by developing rapid molecular diagnostics for SARS-CoV-2 virus detection. In this context, developing a rapid point-of-care (POC) diagnostic test is a holistic approach to the prevention of COVID-19. In this context, this study aims at presenting a real-time, biosensor chip for improved molecular diagnostics including recombinant SARS-CoV-2 spike glycoprotein and SARS-CoV-2 pseudovirus detection based on one-step-one-pot hydrothermally derived CoFeBDCNH2-CoFe2O4 MOF-nanohybrids. This study was tested on a PalmSens-EmStat Go POC device, showing a limit of detection (LOD) for recombinant SARS-CoV-2 spike glycoprotein of 6.68 fg/mL and 6.20 fg/mL in buffer and 10% serum-containing media, respectively. To validate virus detection in the POC platform, an electrochemical instrument (CHI6116E) was used to perform dose dependent studies under similar experimental conditions to the handheld device. The results obtained from these studies were comparable indicating the capability and high detection electrochemical performance of MOF nanocomposite derived from one-step-one-pot hydrothermal synthesis for SARS-CoV-2 detection for the first time. Further, the performance of the sensor was tested in the presence of Omicron BA.2 and wild-type D614G pseudoviruses.

Laser-induced graphene electrodes scribed onto novel carbon black-doped polyethersulfone membranes for flexible high-performance microsupercapacitors

A facile and expandable methodology was successfully developed to fabricate laser-induced graphene from novel pristine aminated polyethersulfone (amPES) membranes. The as-prepared materials were applied as flexible electrodes for microsupercapacitors. The doping of amPES membranes with various weight percentages of carbon black (CB) microparticles was then performed to improve their energy storage performance. The lasing process allowed the formation of sulfur- and nitrogen-codoped graphene electrodes. The effect of electrolyte on the electrochemical performance of as-prepared electrodes was investigated and the specific capacitance was significantly enhanced in 0.5 M HClO4. Remarkably, the highest areal capacitance of 47.3 mF·cm−2 was achieved at a current density of 0.25 mA·cm−2. This capacitance is approximately 12.3 times higher than the average value for commonly used polyimide membranes. Furthermore, the energy and power densities were as high as 9.46 µWh·cm−2 and 0.3 mW·cm−2 at 0.25 mA·cm−2, respectively. The galvanostatic charge–discharge experiments confirmed the excellent performance and stability of amPES membranes during 5,000 cycles, where more than 100% of capacitance retention was achieved and the coulombic efficiency was improved up to 96.67%. Consequently, the fabricated CB-doped PES membranes offer several advantages including low carbon fingerprint, cost-effectiveness, high electrochemical performance and potential applications in wearable electronic systems.

Plasma-enhanced vanadium-based hybrid capacitive deionization for high selective removal of Pb2+

Lead ion is one of the toxic metal ions contaminants in wastewater, and its efficient removal is a critical challenge in wastewater treatment. Therefore, developing a low-cost hybrid capacitive-deionization (HCDI) technology with high adsorption capacity is imminent. Herein, we fabricated (NH4)2V10O25·8H2O (NVO) micro flowers with large layer spacing and achieved enhanced hydrophilicity and rich oxygen vacancies by Ar plasma treatment. The plasma-treated (NH4)2V10O25·8H2O (P-NVO) electrode exhibits high electrochemical performance (204.6 F/g at 1 A/g). Additionally, the P-NVO//active carbon (AC) cell displays a superior adsorption capacity (49.56 mg/g) than that of the NVO//AC cell in Pb(NO3)2) solution. The enhanced adsorption capacity can be attributed to the increased oxygen vacancies, improved hydrophilicity and ion-insertion mechanism induced by plasma treatment. More importantly, the P-NVO//AC cell holds a superior regeneration performance and excellent ion selectivity, as confirmed by experimental results and DFT calculations. Interestingly, we display the concept of aqueous lead-ion batteries based on this cell, demonstrating the potential of combining Pb2+ energy storage and removal. Overall, this work highlights the significance of developing high-performance technology for removing lead ions from wastewater.

Molecular-scale polysiloxane-crosslinking hydrophobic coating boosting high-performance Ni-rich cathode in damp-heat environment

Ni-rich layered oxide, one of the most promising cathode materials for lithium-ion batteries (LIBs) with high energy density, is suffering from the intrinsic hypersensitivity to moisture and acid gas (CO2, SO2, etc.) in the environment, leading to the generation and growth of residual lithium compounds (e.g. Li2CO3), accompanied by surficial phase transition, high alkalinity and electrochemical deterioration. Eliminating these negative effects would require considerable energy and manpower, which hinders the promotion of Ni-rich cathode materials. Herein, we introduced crosslinked poly-methylhydrosiloxane (PMHS) and hydroxy‑terminated poly-dimethylsiloxane (denoted as PDMS-OH) hydrophobic film to in situ coat single-crystal LiNi0.8Co0.1Mn0.1O2 (NCM811), isolating its Ni-rich electrode surface from moisture and acid gas to prevent side reactions. Specifically, the desired crosslinking layer, which is optimized by increasing the relative content of PMHS and decreasing the absolute content of PDMS-OH, endows the coated NCM811 with an appreciable improvement in hydrophobicity and storage performances and effectively suppresses the formation and growth of residual lithium compounds on the surface of NCM811 particles in a simulated damp-heat storage environment. Simultaneously, the crosslinked coating diminished the extraction of Li and Ni during exposure and maintained the high electrochemical performance of NCM811. This proposed strategy to crosslink polysiloxane film on the surface of Ni-rich cathode materials greatly alleviates the problem of storage failure, which will promote the practical popularization of Ni-rich cathode materials in LIBs.

Atomic Layer Deposition of Ultrathin Al2O3 Layer on Carbon Nanotube Anodes for Potassium Ion Batteries with High Initial Coulombic Efficiency and Electrochemical Performance

AbstractPotassium ion batteries (PIBs) have emerged as one of the most attractive alternatives to lithium‐ion batteries (LIBs) to satisfy the burgeoning energy demand. The continuous growth of solid electrolyte interphase (SEI) and consumption of potassium resources cause poor initial Coulombic efficiency (ICE), unstable cycling performance, and even safety issues. Herein, the fabrication of an artificial SEI of an ultrathin Al2O3 layer by atomic layer deposition (ALD) on a multi‐walled carbon nanotubes (MWCNTs) anode for high‐performance PIBs is reported. The SEI resistance and the charge transfer resistance in the MWCNTs electrode are significantly reduced according to electrochemical impedance spectroscopy (EIS) and galvanostatic intermittent titration (GITT) measurements. The MWCNT electrode with a 2‐nm Al2O3 layer exhibits a much higher ICE of up to 85.9% than that of the uncoated one (20.8 %). It also maintains a remarkably high reversible capacity of 284 mA h g−1 at 100 mA g−1 after 100 cycles. In particular, the anode delivers superior rate capability of 558, 303, 251, 203, and 154 mAh g−1 at a current density of 50, 100, 200, 400, and 800 mA g−1, respectively. This work offers an effective approach for fabricating PIBs with high ICE and electrochemical performance.

Optimized Ga-based nanocomposite for superior Li-ion battery anodes

Among the various liquid metals, Ga has unique properties, such as a low melting temperature, fluidity, and non-toxicity. In addition, Ga can alloy with Li to form a Li2Ga phase, which can be applied to high-capacity anodes for Li-ion batteries (LIBs). However, Ga-based materials readily melt and agglomerate during lithiation/delithiation owing to their low melting temperature and high surface energy, resulting in poor cycling stability. In this study, two structural types of Ga, crystalline and amorphous, were selected and electrochemically investigated as LIB anodes. Subsequently, to address the melting and agglomeration issues of the Ga anode, an optimized Ga-based nanocomposite was developed using a novel synthetic concept, namely a solid-state alloying–dealloying process. This process involves an alloying reaction of Ga and Ti to form various Ga–Ti compounds, such as Ga3Ti, Ga2Ti, and Ga3Ti2, and a dealloying reaction with amorphous C to form a nanocomposite comprising evenly dispersed amorphous Ga and Li-inactive TiC in the amorphous C matrix. The Li-inactive TiC and amorphous C matrix in the nanocomposite effectively confined amorphous Ga, thereby preventing the problems caused by its melting and agglomeration during cycling. In addition, an interesting transformation behavior of amorphous Ga into electrochemically stabilized Ga nanocrystallites (approximately 2–3 nm) was demonstrated during cycling, contributing to the high electrochemical performance. The Ga-based nanocomposite exhibited a superior electrochemical performance. This study proposes a better understanding of high-performance Ga-based anodes for LIBs as well as an effective fabrication method for high-performance nanocomposites by solid-state alloying–dealloying.

Simultaneous Sensing of Cd(II), Pb(II), and Cu(II) Using Gold Nanoparticle-Modified APTES-Functionalized Indium Tin Oxide Electrode: Effect of APTES Concentration.

In this work, indium tin oxide (ITO) electrodes were functionalized with varying 3-aminopropyltriethoxysilane (APTES) concentration percentages (0.5, 0.75, 1.0, and 2.0 wt %) to obtain the optimum conditions for the assembly of the as-synthesized gold nanoparticles (AuNPs). The AuNP coverage, wettability, and electrochemical performance of the modified electrodes were evaluated. The AuNP/0.75% APTES-ITO-modified electrode exhibited uniform coverage of AuNPs and high electrochemical performance for the simultaneous detection of Cd(II), Pb(II), and Cu(II) ions. Under the optimum conditions, the AuNP/0.75% APTES-ITO-modified electrode showed a linear detection range of 5-120 ppb and limit of detection of 0.73, 0.90, and 0.49 ppb for the simultaneous detection of Cd(II), Pb(II), and Cu(II) ions, respectively, via square wave anodic stripping voltammetry. The modified electrode demonstrated good anti-interference toward other heavy metal ions, good reproducibility, and suitability for application in environmental sample analysis.

Liquid Metal-Based Electronic Textiles Coated with Au Nanoparticles as Stretchable Electrode Materials for Healthcare Monitoring

Liquid metals (LMs) have gained great attention due to their fluidic behavior and metallic characteristics, suggesting the LMs to be an ideal electrode material for stretchable electronic textiles (e-textiles) in real-time healthcare systems. Despite advancements in material design techniques enabling LMs to monitor physiologic conditions on the skin, the low biostability of LMs remains challenging for practical use in e-textile. Here, we introduce a mechanically responsive and conductive gold nanoparticle (Au NP) layer as encapsulation on the LM layer to monitor healthcare systems with stretchable benefits. The Au NP-encapsulated LM-based e-textile (AuLM textile) shows high electrical and mechanical stabilities under stretching deformation. We also demonstrate that Au NPs can maintain bonding to the fluidic LM layer when stretched and after stretching. The AuLM textile is equipped with biocompatibility and high electrochemical performance, resulting in multimodal biomedical applications. The electrochemical performance of the AuLM textile allows for sweat component detection and noninvasive, high sensitivity estimation of blood sugar contents. In addition, electrocardiography and electromyography measurements determined that the stretchable platform provides stable monitoring results under motion, and the Au NP encapsulation solves the biostability issue caused by a bare LM environment. This is the first demonstration of preparing stretchable e-textiles using the LM platform with practical and multimodal benefits. The study will open numerous design opportunities for next-generation stretchable bioelectronic applications.

Antimony Oxides-Based Anode Materials for Alkali Metal-Ion Storage.

With the increasing demand for renewable energy, alkali metal-ion (lithium/sodium/potassium-ion) batteries play more and more important roles in the field of static storage and electrical vehicle industry. Novel anode materials with high reversible capacity, safety and long-term cycling stability are desiderated to meet the ever-growing demand for alkali metal-ion batteries with high electrochemical performance. Antimony oxides (Sbx Oy ) show electrochemical reaction activity with all of lithium, sodium and potassium, and are expected to be promising anode materials for alkali metal-ion storage due to their high theoretical capacities, appropriate operating potential and excellent safety properties. This review is devoted to overview the research progress on reaction mechanism and improvements in electrochemical performance of antimony oxides for alkali metal-ion storage, and look forward to their further prospects.

Direct writing additive-free V2CTx MXene architectures enables Zn-ion hybrid capacitor with ultrahigh energy density

Constructing a Zinc ion hybrid supercapacitor (ZHMSC) configuration with excellent electrochemical performance for progressive energy storage is worldwide attractive but yet still a considerable challenge. In this study, a universal and effective strategy has been proposed and developed for 3D-writing additive-free V2CTx MXene architected ZHMSC to realize the excellent electrochemical performance. With proper designs of printable electrochemical materials and direct ink writing architectures, 3D printed ZHMSC devices with high areal capacitance and excellent areal energy density have been achieved in a limited footprint area. Benefitting from the excellent ion diffusion and highly conductive networks, the 3D printed ZHMSCs device achieves the ultrahigh specific capacitance of 3.82 F cm−2, large energy density of 1.36 mW h cm−2 and remarkable cyclic performance with the capacitance retention of 97.8 % after 12,000 cycles at 20 mA cm−2. This work not only provides new insights on direct ink writing for high-performance Zn-Ion hybrid capacitor, but also offers a facile and efficient method to construct large-scale energy storage devices with high electrochemical performance for future energy storage.

Polymer incorporated with graphene oxide composite for high electrochemical performance

In this present work the Polyaniline/Graphene Oxide composite (PANI/GO) synthesized by chemical polymerization. XRD pattern shows crystal plane (200) and (002) reveals the presence of GO in the PANI/GO composite, UV-absorption spectra exhibits three distinguished peaks at 235 nm is corresponding to the π to π* transition of C–C in GO, 354 nm and 642 nm indexed with bi-polaronic transition of PANI in red shift, surface morphology revels the PANI homogenously dispersed on the surface of GO. CV curve indicates the PANI/GO composite electrode current rate and surface area 5 fold higher than the PANI electrode, which is suggested that the PANI/GO composite electrode is highly suitable for energy storage devices. EIS spectra show the semi-circle arc, and Rct value of PANI is found to be 28.61 Ω and PANI/GO composite electrode found to be 16.15 Ω. These results represent the PANI/GO composite electrode having more storage capacitive than the PANI, it shows high electrical conductivity, and also enhances the electrochemical performance.

Interface Engineering of Fe7S8/FeS2 Heterostructure in situ Encapsulated into Nitrogen-Doped Carbon Nanotubes for High Power Sodium-Ion Batteries

HighlightsIron sulfide-based heterostructure in situ hybridized with nitrogen-doped carbon nanotubes was prepared through a successive pyrolysis and sulfidation approach.The as-prepared Fe7S8/FeS2/NCNT electrode exhibits superior sodium storage performance in both ester and ether-based electrolytes.The structure advantages of the electrode contribute to high electrochemical performance in the ester-based electrolyte, while fast ionic diffusion and favorable capacitive behavior result in the robust sodium storage performance in the ether-based electrolyte.

A Flexible and Highly Sensitive Pressure Sense Electrode Based on Cotton Pulp for Wearable Electronics.

Flexible pressure sensors with high sensitivity have great potential applications in wearable electronics. However, it is still a great challenge to prepare sense electrodes with high flexibility, high sensitivity, and high electrochemical performance. Here, we propose a novel and simple method for carbonizing cotton fibers as excellent electrically conductive materials. Moreover, carbonized cotton fiber (CCF) and polydimethylsiloxane (PDMS) were assembled into a flexible sense electrode. The CCF/PDMS electrode shows a high sensitivity of 10.8 kPa-1, a wide response frequency from 0.2-2.0 Hz, and durability over 900 cycles. The combined CCF/PDMS sensors can monitor human movement and pulse vibration, showing the enormous potential for use in wearable device technology. Additionally, the CCF/PDMS can be used as electrodes with a specific capacitance of 332.5 mF cm-2 at a current density of 5 mA cm-2, thanks to their high electrical conductivity and hydrophilicity, demonstrating the promising prospect of flexible supercapacitors.

Application analysis of nanomaterials in energy storage and sand treatment

In view of the problems of nanomaterials in the field of energy storage and pollution removal, energy storage composite nanomaterials were proposed in the study, including Fe3O4 Fe3O4@C (MFC), Fe3O4@PANI, Fe3O4@C @PANI core–shell nanomaterials. The experimental design includes the preparation of electrode in energy storage, characterization of electrode materials, electrode cyclic voltammetry test, electrode charge discharge test, and the preparation of catalyst, catalyst characterization, and factors affecting the removal effect in the soil pollutant removal experiment. The preparation process of catalyst for pollution removal was given, including nano ferric oxide and Pd loaded composite. The energy storage performance analysis shows that the four Fe3O4 nanocomposites all contain Fe3O4, and the corresponding diffraction peaks appear at six positions of 30.2°, 35.5°, 43.1°, 53.8°, 57.3° and 62.9° respectively. The electrochemical test results show that Fe3O4 Fe3O4@C (MFC), Fe3O4@PANI, Fe3O4@C @PANI has high electrochemical performance basis and high capacitance. The removal effect analysis shows that the optimal value of the reaction rate constant is 2.1635, the optimal current value is 40 mA, and the optimal pH value is 3.0. The experimental results verify that the composite nano materials with FeCl3.6H2O as the iron source can be used as better capacitor materials and have excellent application prospects. At the same time, the pollution removal results show that Pd-Fe3O4 has incomparable advantages compared with other materials, and has high reliability and effectiveness.

Ultrafine nanoparticles of tin-cobalt-sulfide decorated over 2D MXene sheets as a cathode material for high-performance asymmetric supercapacitor

The design of electrode materials for improved electrochemical properties and stable geometric configuration is known as effective research in developing the electrochemical capability of supercapacitors (SCs). However, there is a difficulty in designing innovative composite material with excellent electrical conductivity and superior specific capacity by way of low cost and easy synthesis process. Herein, for the first time, a stable Sn-Co-S/MXene hybrid material is fabricated through the electrochemical assembly by combining positively charged ultrafine Sn-Co-S nanoparticles (NPs) and negatively charged 2D Ti3C2Tx (MXene) sheets due to electrostatic interaction. The Sn-Co-S/MXene hybrid material has displayed excellent electrochemical performance with an ultrahigh specific capacity of 305.71 mA h gm−1 at 1 A g−1 and capacity retention of 94.8% after 10, 000 charge–discharge cycles. The Sn-Co-S/MXene hybrid material of high electrochemical performance has improved charge transfer kinetics during the charge–discharge process, due to the synergistic coupling effect between ultrafine Sn-Co-S nanoparticles and MXene sheets. Furthermore, the Sn-Co-S/MXene//activated carbon (AC) asymmetric supercapacitor (ASC) device has been configured with the assistance of Sn-Co-S/MXene as cathode and AC as anode materials. The Sn-Co-S/MXene//AC ASC device exhibits a stable potential window of 1.7 V, a high specific capacitance of 108.50F g−1 at 1 A g−1, and an energy density of 43.55Wh kg−1 at a power density of 0.83 kW kg−1. This study validates the design and application of highly electroactive Sn-Co-S/MXene hybrid electrode material for ultrastable asymmetric supercapacitors.