Charge Storage Capacity Research Articles

Critical review on the derivative of graphene with binary metal oxide-based nanocomposites for high-performance supercapacitor electrodes

Abstract Supercapacitors, owing to their high power density and rapid charge–discharge capabilities, have gained significant attention as energy storage devices in various applications. In the context of electrochemical supercapacitors, this article provides a comprehensive review of the production and electrochemical performance of binary metal oxide (BMO) and reduced graphene oxide (rGO) composite materials. The synthesis processes and synergistic benefits of BMO–rGO composites, with an emphasis on how they perform better than separate parts in terms of specific capacitance and cycle stability, are discussed. The potential of BMO–rGO composites as high-performance electrode materials for supercapacitors is highlighted in this research. In the context of electrochemical supercapacitors, this work provides a comprehensive review of the production and electrochemical performance of binary transition metal oxide (TMO) and rGO composite materials. Composite materials with enhanced electrochemical characteristics that are appropriate for supercapacitor applications are the primary novelty, which is the synergistic combination of rGO with a variety of TMOs. Compared to individual TMOs or other carbonaceous materials, these composites demonstrate enhanced specific capacitance, energy density, power density, cyclic stability, and rate capability. The synthesis processes and synergistic benefits of BMO–rGO composites are discussed, with an emphasis on their superior performance in specific capacitance and cycle stability compared to individual components. This research highlights the potential of BMO–rGO composites as high-performance electrode materials for supercapacitors, showcasing their enhanced specific capacitance, improved charge storage capacity, increased power density, excellent cycling stability, and overall durability even after numerous charge–discharge cycles.

Graphene-Based Microelectrodes with Reinforced Interfaces and Tunable Porous Structures for Improved Neural Recordings.

Invasive neural electrodes prepared from materials with a miniaturized geometrical size could improve the longevity of implants by reducing the chronic inflammatory response. Graphene-based microfibers with tunable porous structures have a large electrochemical surface area (ESA)/geometrical surface area (GSA) ratio that has been reported to possess low impedance and high charge injection capacity (CIC), yet control of the porous structure remains to be fully investigated. In this study, we introduce wet-spun graphene-based electrodes with pores tuned by sucrose concentrations in the coagulation bath. The electrochemical properties of thermally reduced rGO were optimized by adjusting the ratio of rGO to sucrose, resulting in significantly lower impedance, higher CIC, and higher charge storage capacity (CSC) in comparison to platinum microwires. Tensile and insertion tests confirmed that optimized electrodes had sufficient strength to ensure a 100% insertion success rate with a low angle shift, thus allowing precise implantation without the need for additional mechanical enhancement. Acute in vivo recordings from the auditory cortex found low impedance benefits from the recorded amplitude of spikes, leading to an increase in the signal-to-noise ratio (SNR). Ex vivo recordings from hippocampal brain slices demonstrate that it is possible to record and stimulate with graphene-based electrodes with good fidelity compared with conventional electrodes.

Green synthesis of porous carbon for supercapacitors from pine cone/phoenix tree fruit fluff by hydrothermal pre-activation method

Herein, a novel porous carbon was prepared from pine cone/phoenix tree fruit (PCT) by hydrothermal pre-activation method. The PCT-derived porous carbon with appropriate PCT/KOH mass ratio exhibited high specific surface area (2428.72 m2/g) and charge storage capacity. The as-prepared symmetrical supercapacitor displayed an energy density of 5.43 Wh/kg at 1000 W/kg, exhibiting excellent cycling stability with maintaining capacitance 99.74 % and coulombic efficiency 99.69 % after 4000 charge–discharge cycles. Additionally, the hydrothermal pre-activation could avoid corrosion of quartz glass reactor at high temperature. This work highlights the potential of hydrothermal pre-activation of the biomass waste PCT in developing carbon-based supercapacitor by a environmentally friendly strategy.

Continuous Electrochemical Carbon Capture via Redox-Mediated pH Swing─Experimental Performance and Process Modeling.

We investigate a continuous electrochemical pH-swing method to capture CO2 from a gas phase. The electrochemical cell consists of a single cation-exchange membrane (CEM) and a recirculation of a mixture of salt and phenazine-based redox-active molecules. In the absorption compartment, this solution is saturated by CO2 from a mixed gas phase at high pH. In the electrochemical cell, pH is reduced, and CO2 is selectively released in a desorption step. We investigate the influence of redox molecule concentration on the charge storage capacity of the solution, as well as the impact of current density and solution recirculation rate on process performance. A theoretical framework, based on a minimal set of assumptions, is established. This framework describes the data very accurately and can be used for system design and optimization. We evaluate the trade-off between energy consumption and CO2 capture rate and compare with published reports. We report a low energy consumption of 32 kJ/mol of CO2 at a capture rate of 39 mmol/m2/min.

Ionogel-Based Electrodes for Non-Flammable High-Temperature Operating Electrochemical Double Layer Capacitors.

The design of interfaces between nanostructured electrodes and advanced electrolytes is critical for realizing advanced electrochemical double-layer capacitors (EDLCs) that combine high charge-storage capacity, high-rate capability, and enhanced safety. Toward this goal, this work presents a novel and sustainable approach for fabricating ionogel-based electrodes using a renewed slurry casting method, in which the solvent is replaced by the ionic liquid (IL), namely 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMIFSI). This method avoids time-consuming and costly electrolyte-filling steps by integrating the IL directly into the electrode during slurry preparation, while improving the rate capability of EDLCs based on non-flammable ILs. The resulting ionogel electrodes demonstrate exceptional electrolyte accessibility and enable the production of symmetric EDLCs with high energy density (over 30Wh/kg based on electrode material weight) and high-rate performance. These EDLCs could operate at temperatures up to 180°C, far exceeding the limitations of traditional EDLCs based on organic electrolytes (1M TEABF4 in acetonitrile, up to 65°C). Ionogel-type EDLCs exhibit remarkable stability, retaining 88% specific capacity after 10000 galvanostatic charge/discharge cycles at 10Ag-1 and demonstrating superior retention compared to conventional EDLCs (50%), while also maintaining 92.4% energy density during 100h floating tests at 2.7V. These electrochemical properties highlight their potential for robust performance under demanding conditions.

Effect of Ni Incorporation in KCoPO4 on the Charge Storage Capacity of KCo1 − xNixPO4 (0 ≤ x ≤ 0.5) Electrodes for the Fabrication of High‐Performing Hybrid Supercapacitors

ABSTRACTFulfilling the increasing energy demands of the world through renewable energy sources requires the utilization of a highly efficient large‐scale electrochemical energy storage device. A hybrid supercapacitor (HSC) that consists of a battery‐type electrode coupled with a counter‐capacitive electrode, while in principle offering supercapacitor‐like power, cyclability, and higher energy density, can be a potential device for large‐scale energy storage to cater to the energy needs through renewable energy sources. The KCo0.5Ni0.5PO4 electrode demonstrated notably enhanced electrochemical performance, attributed to the synergistic interaction of Co2+ and Ni2+ ions in a phosphate framework. The incorporation of redox‐mediated diffusive charge storage through the incorporation of Ni2+ on the Co2+ site resulted in a large‐scale charge storage capacity, coupled with capacitive‐type surface charge storage on the KCo1−xNixPO4 electrodes. The KCo0.5Ni0.5PO4 delivers 173 mAh/g (capacitance: 1038 F/g) at a current density of 0.5 A/g in an aqueous 2 M KOH electrolyte, accompanied by cyclic stability up to 5000 cycles. HSC mode consists of activated carbon as the negative electrode along with KNi0.5Co0.5PO4 as the positive electrode, displaying high energy density and power density of 183.7 Wh/kg and 7952 W/kg, respectively, in 2 M aqueous KOH electrolyte. The superior performance in HSC mode makes KCo0.5Ni0.5PO4 a potential positive electrode for the development of high‐performing HSCs.

Ti3C2Tx/Au NPs/PPy ternary heterostructure-based intra-capacitive self-powered sensor for DEHP detection.

Phthalate esters, particularly di(2-ethylhexyl) phthalate (DEHP), are widely used plasticizers found in various consumer products, posing significant environmental and health risks due to their endocrine-disrupting effects. In this study, a novel enzyme-free intra-capacitive biofuel cell self-powered sensor (ICBFC-SPS) was developed. The ICBFC-SPS integrated a ternary heterostructure-based capacitive anode and a cathode with a sensing interface into a single-chamber electrolytic cell. The ternary heterostructure based on Ti3C2Tx MXene with ultra-small Au NPs and polypyrrole (PPy) NPs was prepared to provide the efficient glucose oxidation and robust electron production. Furthermore, the charge storage capacity was significantly enhanced through a synergistic combination of the double-layer capacitor mechanism of Ti3C2Tx and the pseudocapacitive behavior of PPy. Additionally, the intercalation of PPy NPs expanded the interlayer spacing, promoting electrolyte ion diffusion and charge transfer. The ICBFC-SPS demonstrated exceptional sensitivity with a linear detection range from 0.05 to 100000 ng/L and a detection limit of 9.51 pg/L for the sensitive and selective detection of DEHP in complex environmental and biological samples. The ICBFC-SPS addresses the limitations of traditional methods by providing a self-powered, highly sensitive, and portable platform for rapid, on-site DEHP detection. This work underscores the potential of self-powered sensors as transformative tools for real-time environmental monitoring and public health protection.

In situ oxidized Mo2CTx MXene film via electrochemical activation for smart electrochromic supercapacitors.

Mo2CTx MXenes have great potential for multifunctional energy storage applications because of their outstanding electrical conductivity, superior cycling stability, and high optical transmittance. In this study, we fabricate Mo2CTx film electrodes (referred to as Mo2C) on fluorine-doped tin oxide (FTO) substrates using the layer-by-layer (LbL) self-assembly technique. To improve the energy-storage performance of Mo2CTx film electrodes, we develop a convenient electrochemical activation process to prepare in situ oxidized Mo2CTx/MoO3 film electrodes (referred to as EA-Mo2C). The Mo2CTx/MoO3 hybrid film benefits from the addition of MoO3, which introduces extra redox sites and enhances the charge-storage capacity. Furthermore, the unique layered structure of Mo2CTx significantly reduces the diffusion energy barrier for cations. The synergistic interaction between Mo2CTx and MoO3 results in superior electrochemical performance, and the EA-Mo2C displays a remarkable increase in areal specific capacitance, achieving 23.29 mF cm-2 at a current density of 1.5mA cm-2, which is 518% higher than that of Mo2C. The electrochromic supercapacitor, assembled using EA-Mo2C as the ion-storage layer and polyaniline (PANI) as the electrochromic layer, enables power visualization and quantitative display. In summary, this study utilizes in situ electrochemical activation to derive high-performance electrode materials, offering an innovative strategy for advancing MXene-based energy-storage materials.

2D Mesoporous Carbon with Hollow Turtle Shell‐Like Morphology for Resolving Restacking Effect

AbstractIn this work, a unique 2D hollow turtle shell‐like mesoporous carbon (HTMC) synthesized via a ternary heterostructuring strategy to alleviate the restacking tendency of 2D materials is presented. The ternary 2D heterostructuring is achieved via an in situ growth of zeolitic imidazolate framework‐8 (ZIF‐8) on graphene oxide (GO) and a subsequent mesostructured polydopamine (mPDA) coating to obtain ternary heterostructured GO@ZIF‐8@mPDA, which is then converted to the hierarchically porous HTMC having macro‐, meso‐, and micropores via direct carbonization. Additionally, 2D turtle shell‐like microporous carbon (TMC) and 2D mesoporous carbon (MPC) derived from binary heterostructured GO@ZIF‐8 and GO@mPDA, respectively, are synthesized to investigate the porosity effect on alleviating the loss of accessible surface area of restacked 2D carbons. Among them, HTMC demonstrates superior structural advantages for alleviating the negative effects of restacking in 2D materials, exhibiting by far the highest specific capacitance (Csp) across all scan rates (93.7 F g−1 at 500 mV s−1 to 334.47 F g−1 at 1 mV s−1) in 1 M H2SO4. Furthermore, HTMC demonstrates outstanding rate capability while maintaining the greatest charge storage capacity over all scan rates.

Advances in Metal Chalcogenides and Metal Oxides Supercapacitors: A Comprehensive Review of Fundamental Mechanisms and Recent Progress

The rising worldwide demand for energy storage devices has driven significant advancements in studies regarding supercapacitor (SC), particularly in the context of renewable green energy systems and electronics. SCs have come up as a critical technology, providing ultra-fast charging, long lifespan and high-power density when compared to conventional batteries. These attributes make SCs ideal for applications that needs surging energy delivery, such as electric vehicles and grid energy storage systems. Lately wide range of research has been focused on enhancing the energy density through the development of advanced evolved materials and device architectures. This review article discusses recent advancements in SC, particularly in electrode materials, such as transition metal oxides (e.g., RuO2, MnO2, V2O5) and metal chalcogenides (e.g., MoS2), which exhibit high surface area, great electrical conductivity, and mechanical stability. These materials, alongside carbon-based materials like graphene and conducting polymers, have demonstrated significant improvements in charge storage capacity and energy transfer efficiency. Hybrid materials containing metal oxides with carbon-based contents have shown great promise in enhancing both energy and power densities. The review also discusses recent trends in electrolytes, including ionic liquids, aqueous solutions, and solid-state electrolytes, which have played significant role in improving SC performance by widening the voltage window and enhancing stability. Despite these technological advancements, challenges such as cost-effective material production and scalability remain barriers to widespread commercialization. The customization of SCs into hybrid energy storage systems alongside batteries and fuel cells presents a promising avenue for future development. This review article pins down the importance of ongoing research to overcome these challenges while fully realizing the potential of SCs in the evolving energy landscape.

Tetragonal Tungsten Oxide for Supercapacitor Electrodes: Study of Phase-Driven Charge Storage Mechanism and Work Function Control.

The crystal phase of pseudocapacitive materials significantly influences charge storage kinetics and capacitance; yet, the underlying mechanisms remain poorly understood. This study focuses on tungsten oxide (WO3), a material exhibiting multiple crystal phases with potential for energy storage. Despite extensive research on WO3, the impact of different crystal structures on charge storage properties remains largely unexplored. Here, the successful synthesis and electrochemical characterization of tetragonal WO3 are reported. This investigation demonstrates that tetragonal WO3 exhibits superior energy storage capabilities compared to other WO3 polymorphs. According to in situ Raman spectroscopy and ultraviolet photoelectron spectroscopy combined with in-depth electrochemical analyses, this enhancement is attributed to a unique charge storage mechanism and an expanded potential window facilitated by an engineered electrode work function. This study highlights the critical role of the crystal phase in optimizing the performance of pseudocapacitive materials and provides valuable insights for the development of next-generation energy storage devices.

Ultrathin Bioelectrode Array with Improved Electrochemical Performance for Electrophysiological Sensing and Modulation.

To achieve high accuracy and effectiveness in sensing and modulating neural activity, efficient charge-transfer biointerfaces and a high spatiotemporal resolution are required. Ultrathin bioelectrode arrays exhibiting mechanical compliance with biological tissues offer such biointerfaces. However, their thinness often leads to a lack of mechano-electrical stability or sufficiently high electrochemical capacitance, thus deteriorating their overall performance. Here, we report ultrathin (∼115 nm) bioelectrode arrays that simultaneously enable ultraconformability, mechano-electrical stability and high electrochemical performance. These arrays show high opto-electrical conductivity (2060 S cm-1@88% transparency), mechanical stretchability (110% strain), and excellent electrochemical properties (24.5 mC cm-2 charge storage capacity and 3.5 times lower interfacial impedance than commercial electrodes). The improved mechano-electrical and electrochemical performance is attributed to the synergistic interactions within the poly(3,4-ethylenedioxythiophene) sulfonate (PEDOT:PSS)/graphene oxide (GO) interpenetrating network (PGIN), where π-π and hydrogen bonding interactions improve conductive pathways between PEDOT chains and enhance the charge-transfer mobility. This ultrathin bioelectrode is compatible with photolithography processing and provides spatiotemporally precise signal mapping capabilities for sensing and modulating neuromuscular activity. By capturing weak multichannel facial electromyography signals and applying machine learning algorithms, we achieve high accuracy in silent speech recognition. Moreover, the high transparency of the bioelectrode allows simultaneous recording of electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) signals, facilitating dual-mode brain activity analysis with both high temporal and high spatial resolution.

A Body-Temperature-Triggered In Situ Softening Peripheral Nerve Electrode for Chronic Robust Neuromodulation.

Implantable peripheral nerve electrodes are crucial for monitoring health and alleviating symptoms of chronic diseases. Advanced compliant electrodes have been developed because of their biomechanical compatibility. However, these mechanically tissue-like electrodes suffer from unmanageable operating forces, leading to high risks of nerve injury and fragile electrode-tissue interfaces. Here, a peripheral nerve electrode is developed that simultaneously fulfills the criteria of body temperature softening and tissue-like modulus (less than 0.8MPa at 37°C) after implantation. The central core is altered from the tri-arm crosslinker to the star-branched monomer to kill two birds (close the translation temperature to 37°C and decrease the modulus after implantation) with one stone. Furthermore, the decreased interfacial impedance (325.1±46.9Ω at 1kHz) and increased charge storage capacity (111.2±5.8mCcm-2) are achieved by an in situ electrografted conductive polymer on the strain-insensitive conductive network of Au nanotubes. The electrodes are readily wrapped around nerves and applied for long-term stimulation in vivo with minimal inflammation. Neuromodulation experiments demonstrate their potential clinical utility, including vagus nerve stimulation in rats to suppress seizures and alleviation of cardiac remodeling in a canine model of myocardial infarction.

Fabrication and evaluation of Wrap Around Neural-Pass to record and stimulate neural activity in the cervical spinal cord

Abstract We have successfully fabricated a Wrap Around Recording Electrode to record neural activity in the Cervical Spinal Cord (CSC) and a Wrap Around Stimulating Electrode to stimulate the CSC. These are used in the Wrap Around Neural-Pass to improve the QOL of patients with CSC injury by restoring motor, sensory, upper limb, and lower limb nerves minimally invasively that invades only the CSC. The fabricated electrodes had sufficient wrapping ability to be wrapped around the CSC of rats and could record neural activity in the rat’s spinal cord. We also clarified the optimal polymerization conditions for PEDOT used as the stimulating electrode material for the Wrap Around Stimulating Electrode, and the electrodes had low impedance, high Cathodal Charge Storage Capacity (CSCC), and Charge Injection Capacity (CIC) suitable for stimulating the CSC nerves.

Restricted growth of polyaniline nanofiber arrays between holey graphene sheets on carbon cloth towards improved charge storage capacity

The rapid−growing demand for flexible and wearable electronics has driven increased interest in developing porous electrodes with outstanding charge storage capacity especially areal capacity for polymeric and hybrid supercapacitors. Herein, unique porous polyaniline/holey graphene/carbon cloth (PANI/HG/CC) composite electrodes were constructed by combining rapid frozen interfacial polymerization and layer−by−layer spraying to restrict the growth of PANI nanofiber arrays between carbon−based materials. Benefiting from rapid charge transport, more electroactive sites and improved electrolyte penetration provided by hierarchical porous structure and highly oriented PANI nanofibers in the composite (P − G) by growing directly PANI array on the CC and applying graphene sheets as interlayer and cover layer, an areal specific capacitance of 3.22 F cm−2 at 5 mA cm−2 was achieved. A maximum areal energy density of up to 104.86 μWh cm−2, and excellent capacity retention of 89.5 % at 20 mA cm−2 after 5000 cycles also were achieved for flexible symmetric all−solid−state supercapacitor. Furthermore, the zinc−ion hybrid supercapacitor (P − G||Zn) assembled with P − G cathode and Zn anode could display a capacity of 217.7 mAh g−1 at 0.2 A g−1, and the maximum energy density of 130.6 Wh kg−1 at the power density of 120 W kg−1.

Interconnecting EDOT-Based Polymers with Native Lignin toward Enhanced Charge Storage in Conductive Wood.

The 3D micro- and nanostructure of wood has extensively been employed as a template for cost-effective and renewable electronic technologies. However, other electroactive components, in particular native lignin, have been overlooked due to the absence of an approach that allows access of the lignin through the cell wall. In this study, we introduce an approach that focuses on establishing conjugated-polymer-based electrical connections at various length scales within the wood structure, aiming to leverage the charge storage capacity of native lignin in wood-based energy storage electrodes. We demonstrate that poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) PEDOT/PSS, integrated within the cell wall lumen, can be interfaced with native lignin through the wood cell wall through in situ polymerization of a water-soluble S-EDOT monomer. This approach increases the capacitance of the conductive wood to 315 mF cm-2 at a scan rate of 5 mV s-1, which is seven and, respectively, two times higher compared to the capacitance of conductive wood made with the single components PEDOT/PSS or S-PEDOT. Moreover, we show that the capacitance is contributed by both the electroactive polymers and native lignin, with native lignin accounting for over 70% of the total charge storage capacity. We show that accessing native lignin through in situ creation of electrical interconnections within the wood structure offers a pathway toward sustainable, wood-based electrodes with improved charge-storage capacity for applications in electronics and energy storage.

Interfacial charge trap engineering of organic semiconductors using reactive oxygen plasma for enhanced performance in phototransistor memory

Significant advancements have been observed in organic photonic field-effect transistors, primarily attributed to the swift evolution of conjugated materials. In this study, plasma oxidation is utilized as a surface modification strategy on a series of quinacridones (QA) based molecules to further exploit the performance of conjugated materials. Accordingly, alkylated QA is incorporated as a memory layer into the photonic field-effect transistor memory devices, with pentacene serving as the transport layer. The study aims to elucidate the correlation between functionalized interfaces and charge storage capacity. The findings indicate that plasma oxidation can elicit charge storage effects due to the formation of tertiary amine species and morphological modifications. The alkylated QA with an optimal chain length, subjected to a 10-s plasma oxidation process, demonstrates remarkable memory ratios reaching as high as 104. Additionally, the retention capabilities of these devices remain approximately 104 after a duration of 10,000 s, signifying substantial durability. These findings underscore the efficacy of plasma oxidation as a significant method for enhancing the operational performance of photonic field-effect transistor memory devices.

Ternary metal oxide carbon composite as high-performance electrode material for supercapacitor applications

Recently, ternary metal oxides carbon composites recognized as metal organic frameworks (MOFs) have gained striking attention for supercapacitor electrode material due to high surface area, porosity, chemical stability, tunable properties, redox activity, and eco-friendly material. ZIF-67 is a novel MOF possessing these characteristics. Therefore, the present work reports the development of ternary iron-nickel–cobalt ZIF-67 composites (FeNiCo ZIF-67) using co-precipitation method with the variation in molar concentration of iron oxide, nickel oxide, and cobalt oxide. Physico-chemical characterizations of developed materials were investigated through X-ray diffraction (XRD), Raman spectroscopy, energy dispersive X-ray (EDX), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) to confirm the successful formation of composites and structure, morphology. Then, the electrodes were fabricated for all three synthesized composites and electrochemical analyses such as cyclic voltammetry (CV), galvanic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS) were performed. The results revealed the porous polyhedral structure of FeNiCo ZIF-67 with different compositions consisting of interconnected nanoparticles played an important role in increasing the charge storage capacity of the material. Among the composites, FeNiCo ZIF-67 (1:2:1) electrode material achieved the highest specific capacitance of 532.7 F/g at a current density of 1 A/g. FeNiCo ZIF-67 (1:2:1) exhibited maximum electrochemical active surface area 89.12. Electrochemical impedance spectroscopy (EIS) demonstrated the minimal resistance of 7.8 Ω by FeNiCo ZIF-67 (1:2:1) composite electrode compared to the other two electrode materials. Cyclic stability study revealed the capacitance retention of 91 % after 10,000 continuous charge discharge cycles at a current density of 10 A/g. Electrode material demonstrated an outstanding electrochemical performance, and this work could provide a simple strategy to fabricate FeNiCo ZIF-67 nanostructured electrode materials for supercapacitors.

Enhancing output performance of triboelectric nanogenerator by increasing charge storage capacity of electrodes

Enhancing output performance of triboelectric nanogenerator by increasing charge storage capacity of electrodes

Coordination and Hydrogen Bond Chemistry in Tungsten Oxide@Polyaniline Composite toward High-Capacity Aqueous Ammonium Storage.

Aqueous ammonium ion batteries (AAIBs) have garnered significant attention due to their unique energy storage mechanism. However, their progress is hindered by the relatively low capacities of NH4 + host materials. Herein, the study proposes an electrodeposited tungsten oxide@polyaniline (WOx@PANI) composite electrode as a NH4 + host, which achieves an ultrahigh capacity of 280.3 mAh g-1 at 1 A g-1, surpassing the vast majority of previously reported NH4 + host materials. The synergistic interaction of coordination chemistry and hydrogen bond chemistry between the WOx and PANI enhances the charge storage capacity. Experimental results indicate that the strong interfacial coordination bonding (N: →W6+) effectively modulates the chemical environment of W atoms, enhances the protonation level of PANI, and thus consequently the conductivity and stability of the composites. Spectroscopy analysis further reveals a unique NH4 +/H+ co-insertion mechanism, in which the interfacial hydrogen bond network (N-H···O) accelerates proton involvement in the energy storage process and activates the Grotthuss hopping conduction of H+ between the hydrated tungsten oxide layers. This work opens a new avenue to achieving high-capacity NH4 + storage through interfacial chemistry interactions, overcoming the capacity limitations of NH4 + host materials for aqueous energy storage.