Sequential K+ and Cs+ Intercalation into Ti3C2TX-Reduced Graphene Oxide Hydrogel for Enhanced Performance of Zinc-Ion Hybrid Supercapacitors
Source abstract
Abstract
Abstract Preintercalation engineering is an effective strategy for regulating MXene interlayer structures. However, the competitive behavior among different cations is rarely reported. Herein, we elucidate the competitive intercalation mechanism of Cs+ in K+-preintercalated Ti3C2TX and its impact on the performance of zinc-ion hybrid supercapacitors (ZHSCs). K+ preintercalation expands the interlayer galleries and lowers the diffusion barrier for the subsequent Cs+ insertion. Because of its larger ionic radius and stronger electrostatic interaction, Cs+ competitively replaces most of the preintercalated K+, resulting in a further enlarged and stabilized interlayer spacing. When the resultant K+/Cs+-Ti3C2TX is integrated into a 3D conductive hydrogel, restacking is effectively suppressed, and ion/electron transport is facilitated. For a ZHSC constructed with a zinc plate and an electrode based on reduced graphene oxide-supported K+/Cs+-Ti3C2TX hydrogel, a high specific capacitance of 255 F g–1 is achieved at 1 A g–1 with excellent cycling stability. Results from this work reveal the intrinsic significance of competitive cation intercalation in enhancing the performance of MXenes in energy-storage devices.
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Research context
OpenAlex topics: MXene and MAX Phase Materials · Supercapacitor Materials and Fabrication · Advancements in Battery Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Beijing University of Chemical Technology , , ,
University of California , , 1156 High Street , , ,
Funding
National Basic Research Program of China
References (55)
Show source-provided references
1. A Review on Biomass-Derived Activated Carbon for Next-Generation Supercapacitors: Cutting-Edge Advances and Future Prospects10.1021/acs.energyfuels.4c03842 ↗
2. Synthesis of a MXene/Metal–Organic Framework Composite for Efficient Supercapacitor and Electrocatalytic CO2 Reduction10.1021/acsami.5c07809 ↗
3. CdSe Nanoparticles Synergized with 2D Ti3C2TX MXene as the Dual-Function Composite for Enhanced K+ Ion Storage and Water Splitting10.1021/acsami.4c22281 ↗
4. Microfluidic-oriented assembly of MXene composite fibers for flexible zinc ion supercapacitors with high energy density10.1016/j.cej.2025.162864 ↗
5. Fundamentals and Scientific Challenges in Structural Design of Cathode Materials for Zinc-Ion Hybrid Supercapacitors10.1002/aenm.202202303 ↗
6. Zinc-ion hybrid capacitors: Electrode material design and electrochemical storage mechanism10.1016/j.jpowsour.2024.234638 ↗
7. Recent Developments and Future Prospects for Zinc-Ion Hybrid Capacitors: a Review10.1002/aenm.202003994 ↗
8. A comprehensive review on fundamentals and components of zinc-ion hybrid supercapacitors10.1016/j.est.2023.110370 ↗
9. Dual-metallic site regulation boosts charge storage in zinc-ion hybrid supercapacitors10.1016/j.apmate.2025.100364 ↗
10. MXene/Zwitterionic Hydrogel Oriented Anti-freezing and High-Performance Zinc-Ion Hybrid Supercapacitor10.1002/adfm.202409207 ↗
11. The emerging of zinc-ion hybrid supercapacitors: Advances, challenges, and future perspectives10.1016/j.susmat.2022.e00536 ↗
12. Progress and challenges of zinc ion capacitors: From basic principles to performance optimization strategies10.1016/j.cej.2025.163974 ↗
13. Synergistic Mo/V-Implanted 2D M3X2 MXene Nanoarchitectures for Enhanced Structural Stability and Ultrahigh Proton Storage Performance10.1002/aenm.202505156 ↗
14. Revealing the ionic storage mechanisms of Mo2VC2TZ. (MXene) in multiple aqueous electrolytes for high-performance supercapacitors10.1016/j.cej.2025.165537 ↗
15. Thermal Stability of MXene: Current Status and Future Perspectives10.1002/smll.202505881 ↗
16. Uncovering the strengthening mechanisms of metal vacancies in the structure and capacitance performance of defect-controlled Mo2–□CT MXene10.1016/j.cej.2025.165391 ↗
17. Synthesis of Two-Dimensional Materials by Selective Extraction10.1021/ar500346b ↗
18. Conductive two-dimensional titanium carbide ‘clay’ with high volumetric capacitance10.1038/nature13970 ↗
19. MXene M2C (M = Ti, V, Cr, and Nb) as electrode material for various intercalation batteries (Li, Na, Mg, Al, K, Ca, and Zn -ion): ab-initio studies10.1016/j.surfin.2025.108174 ↗
20. A Review of MXene’s Retroactive Development in Energy Storage Applications10.1002/slct.202502846 ↗
21. MXene-Based Flexible Sensors: Materials, Preparation, and Applications10.1002/admt.202202029 ↗
22. Recent advances and latest technologies in energy storage applications based on 2D MXene10.1016/j.est.2023.110335 ↗
23. MXene-based heterostructures: Current trend and development in electrochemical energy storage devices10.1016/j.pecs.2023.101097 ↗
24. 2,6-Diaminoanthraquinone modified MXene (Ti3C2TX)/graphene as the negative electrode materials for ionic liquid-based asymmetric supercapacitors10.1016/j.gee.2024.08.004 ↗
25. One-Dimensional pi-d Conjugated Coordination Polymer Intercalated MXene Compound for High-Performance Supercapacitor Electrode10.1002/smtd.202201539 ↗
26. Intercalation of C60 into MXene Multilayers: A Promising Approach for Enhancing the Electrochemical Properties of Electrode Materials for High-Performance Energy Storage Applications10.1021/acsomega.3c04058 ↗
27. Ti3C2TX/carbon nanotube/porous carbon film for flexible supercapacitor10.1016/j.cej.2021.132002 ↗
28. Interlayer-Expanded Metal Oxide/Sulfide Composites for Ultrastable Flexible Hybrid Supercapacitors10.1021/acsami.5c20865 ↗
29. Organic intercalation-induced interlayer engineering of V2CTX MXene for high-performance zinc-ion batteries10.1016/j.cej.2025.166812 ↗
30. Quantitative pre-intercalation of alkali metal ions enables precisely modulating Li+ storage of MXenes10.1016/j.ensm.2024.103828 ↗
31. Metal Cation Pre-Intercalated Ti3C2TX MXene as Ultra-High Areal Capacitance Electrodes for Aqueous Supercapacitors10.1021/acsaem.2c00653 ↗
32. MXene-Based Materials for Electrochemical Sodium-Ion Storage10.1002/advs.202003185 ↗
33. A Review of the Structural Design of Anode Materials in Sodium-Ion Batteries Based on MXenes and Their Composites10.3390/batteries9010048 ↗
34. Emerging 2D MXenes as next-generation materials for energy storage applications10.1016/j.est.2023.108004 ↗
35. High-performance Zn-ion hybrid supercapacitor based on 3D K+-intercalated Ti3C2TX hydrogel cathode10.1016/j.jallcom.2025.179588 ↗
36. Selectivity for intercalated ions in MXene toward a high-performance capacitive electrode10.1007/s40843-022-2243-2 ↗
37. Multi-ion competition mechanism within MXene interlayer and Li ion intercalated electrode function10.1016/j.apsusc.2023.157043 ↗
38. Highly Electrically Conductive Three-Dimensional Ti3C2TX MXene/Reduced Graphene Oxide Hybrid Aerogels with Excellent Electromagnetic Interference Shielding Performances10.1021/acsnano.8b05739 ↗
39. High-Energy-Density Asymmetric Supercapacitor Based on Free-Standing Ti3C2TX@NiO-Reduced Graphene Oxide Heterostructured Anode and Defective Reduced Graphene Oxide Hydrogel Cathode10.1021/acsami.2c02507 ↗
40. Design and characterization of 2D MXene-based electrode with high-rate capability10.1557/s43577-021-00150-z ↗
41. Effect of synthesis temperature on the phase structure, morphology and electrochemical performance of Ti3C2 as an anode material for Li-ion batteries10.1016/j.ceramint.2018.05.267 ↗
42. Rapid Fabrication of Cobalt/Cobalt Oxide Heterostructured Catalysts for Efficient Electrochemical Water Splitting10.1002/asia.70647 ↗
43. X-ray photoelectron spectroscopy characterization of the layered intercalated compound K2xMn1–xPS310.1016/j.apsusc.2005.03.167 ↗
44. The effect of cesium dopant on APCVD graphene coating on copper10.1016/j.jmrt.2020.06.091 ↗
45. Recommended strategies for quantifying oxygen vacancies with X-ray photoelectron spectroscopy10.1016/j.jeurceramsoc.2024.116709 ↗
46. Carbon nanotubes boosts the toughness and conductivity of wet-spun MXene fibers for fiber-shaped super capacitors10.1016/j.carbon.2022.08.045 ↗
47. The Mass-Balancing between Positive and Negative Electrodes for Optimizing Energy Density of Supercapacitors10.1021/jacs.4c00486 ↗
48. High energy-power density Zn-ion hybrid supercapacitors with N/P co-doped graphene cathode10.1016/j.jpowsour.2021.230941 ↗
49. 3D porous H-Ti3C2TX films as free-standing electrodes for zinc ion hybrid capacitors10.1016/j.cej.2022.135052 ↗
50. Self-Supporting Lignin-Based Carbon Material Flexible Supercapacitor Prepared by the Microwave Method10.1021/acs.energyfuels.2c01613 ↗
51. A Quasi-Solid-State Li-Ion Capacitor Based on Porous TiO2 Hollow Microspheres Wrapped with Graphene Nanosheets10.1002/smll.201602331 ↗
52. A high-capacity aqueous Zn-ion hybrid energy storage device using poly(4,4′-thiodiphenol)-modified activated carbon as a cathode material10.1039/C9TA08693E ↗
53. Spatially confined synthesis of TiNb2O7 quantum dots onto mesoporous carbon and Ti3C2TX MXene for boosting lithium storage10.1016/j.gee.2024.03.004 ↗
54. Porous nitrogen-doped carbon/carbon nanocomposite electrodes enable sodium ion capacitors with high capacity and rate capability10.1016/j.nanoen.2019.104240 ↗
55. Continuous Fabrication of Ti3C2TX MXene-Based Braided Coaxial Zinc-Ion Hybrid Supercapacitors with Improved Performance10.1007/s40820-021-00757-6 ↗