Deepak P Dubal

• Doctor of Philosophy
• Professor at Queensland University of Technology

The development of safety alarm systems and sustainable power generators that can sustain extreme temperature environments and contact with fire can be lifesaving, but challenging at the same time. Here, a biomaterial (chitosan‐phytic acid) coated non‐flammable cotton fabric‐based triboelectric nanogenerator (TENG) is developed that can be used as...

Nickel cobalt sulfide (NiCo2S4) has considerable potential electrode material for supercapacitors owing to its distinct physical and chemical characteristics. However, the practical applications of pristine NiCo2S4 have been limited by issues such as small specific surface area, agglomeration, and volume changes during cycling, leading to low speci...

This study presents an analysis of the structural, electronic, and surface properties of NiO using first‐principles density functional theory (DFT) calculations. The investigation focuses on three lattice parameters (a = 4.23 Å, 4.187 Å, and 4.183 Å) to explore how lattice strain influences the electronic band structure, density of states (DOS), qu...

Advances in tactile and haptic intelligence are driven by development of advanced funtional materials capable of translating subtle physical interactions into precise electrical signals. This study presents an innovative approach to enhancing touch sensitivity by incorporating 3D Zinc Oxide (ZnO) tetrapods into a piezoelectric polymer matrix. The d...

Transition metal molybdates are one of the most prominent materials for energy storage devices. The present investigation establishes a strong correlation between the structure and electrochemical performance of NiMoO4 through Density Functional Theory (DFT). Initially, the NiMoO4 microspheres are directly deposited on nickel foam using a hydrother...

The growing demand for high‐energy density Ni‐rich cathode materials, driven by the rise in lithium‐ion batteries for electric vehicles and electronics necessitates fast, efficient production methods. Traditional methods for Ni‐rich cathodes are energy‐intensive, taking up to 24 hours, which increases costs and CO2 emissions. In contrast, this stud...

The present review offers a strategic roadmap for overcoming conventional photocatalyst limitations and emphasizes recent advancements in hybrid photocatalysts, thereby addressing electrode and topology‐associated challenges for sustainable hydrogen (H₂) production and storage. Unlike traditional reviews, this paper explores the latest developments...

In the present study, self-assembled hierarchical CoMn-LDH, CoMn@CuZnS, and CoMn@CuZnFeS heterostructured composites were synthesized for bifunctional applications. As an electrode for a supercapacitor, CoMn-LDH demonstrated superior areal and specific capacitance of 5.323 F cm⁻² (279.49 mAh/g) at 4 mA cm⁻², comparable to or even higher than other...

Transition metal molybdates (AMoO 4 where A = Ni, Co, Mn, Fe, and Zn) have attracted much attention as promising electrode materials for energy storage devices due to their multi‐electron redox capability, higher electrical conductivity, good chemical and thermal stability, and stable crystal structure to get superior electrochemical performance. T...

Herein, NaCl‐templated mesoporous hard carbons (NMCs) have been designed and engineered with tunable surface properties as anode materials for potassium‐ion batteries (KIBs) and hybrid capacitors (KICs). By utilizing “water‐in‐oil” emulsions, the size of NaCl templates is precisely modified, leading to smaller particles that enable the formation of...

Recently transition metal compounds containing phosphorous, such as metal phosphates and phosphides have attracted great attention for energy storage devices such as supercapacitors. Benefiting from high ion conductivity, good chemical...

Enhanced electrochemical performance of Cu-doped LFP compared with bare LFP through the solution combustion synthesis method.

To address the challenge of low electronic and ionic conductivities in lithium-ion batteries (LIBs), we synthesized oxidized mixed-phase Ti3C2Tx MXene nanosheets using a wet chemical etching route. This prepared negative electrode demonstrated a reversible specific discharge capacity of 538.49 mAh/g at 0.1C (67 mA/g), which is significantly higher...

The rise of electronic societies is driving a surge in the demand for energy storage solutions, particularly in the realm of renewable energy technologies like batteries, which rely heavily on efficient electrode materials and separators. As an answer to this necessity, Covalent Organic Frameworks (COFs) are emerging and a highly intriguing class o...

The synthesis of battery materials from biomass as feedstock is not only effective but also aligns with sustainable practices. However, current methods like slow pyrolysis/heating are both energy‐intensive and economically impractical. Hence, integrating energy‐efficient technologies becomes imperative to curtail substantial energy consumption and,...

Exploration of innovative strategies aiming to boost energy densities of supercapacitors without sacrificing the power density and long‐term stability is of great importance. Herein, highly porous nitrogen‐doped carbon spheres (NPCS) are decorated onto the graphite sheets (GSs) through a hydrothermal route, followed by a chemical activation. The ca...

To address the challenge of low electronic and ion conductivities in lithium‐ion batteries (LIBs), we synthesized MoTe2@Ti3C2Tx via a modified hydrothermal route. This 2D van der Waals composite exhibited a stable reversible specific discharge capacity of 566 mAh/g at 0.1C (67 mA/g) and retained 71% of its initial capacity during rate performance t...

As reserves of non‐renewable energy sources decline, the search for sustainable alternatives becomes increasingly critical. Next‐generation energy materials play a key role in this quest by enabling the manipulation of properties for effective energy solutions and understanding interfaces to enhance energy yield. Studying these interfaces is essent...

Present report explores microrod-shaped bimetallic cobalt iron phosphate grown through a cost-effective, single-run chemical route at 70 °C on stainless steel substrate. XRD, FTIR, TEM, and XPS analyses confirm the formation of the Co3Fe4(PO4)6 phase, wherein cobalt exhibits a +2 oxidation state, and iron adopts a +3 oxidation state. SEM analysis r...

Self-powered devices are the most interesting research subject in recent times, focusing on the advancement of the flexible and wearable electronics market. A variety of self-powered systems have been designed using different energy harvesting (solar cells, mechanical as well as thermal energy harvester) and storage devices such as supercapacitors....

Flexible all‐solid‐state asymmetric supercapacitors (FAASC) represent a highly promising power sources for wearable electronics. However, their energy density is relatively less as compared to the conventional batteries. Herein, a novel ultra‐high energy density FAASC is developed using nickel–cobalt sulfide (NiCo2S4)/polyaniline (PANI)/manganese d...

Lead-free double perovskites (DPs) will emerge as viable and environmentally safe substitutes for Pb-halide perovskites, demonstrating stability and nontoxicity if their optoelectronic property is greatly improved. Doping has been experimentally validated as a powerful tool for enhancing optoelectronic properties and concurrently reducing the defec...

Aqueous batteries using non‐metallic charge carriers like proton (H⁺) and ammonium (NH4⁺) ions are becoming more popular compared to traditional metal‐ion batteries, owing to their enhanced safety, high performance, and sustainability (they are ecofriendly and derived from abundant resources). Ammonium ion energy storage systems (AIBs), which use N...

Rechargeable Zn-ion batteries have the potential to address the need for cheap and widely accessible energy storage. Metal-doped manganese oxide cathodes are a common and effective choice for Zn-ion batteries. Zn-ion battery development can be advanced by overcoming the poor cycle life that many metal-doped Mn-oxide cathodes suffer from. Plasma-tre...

Lithium‐ion batteries are commonly used for energy storage due to their long lifespan and high energy density, but the use of unsafe electrolytes poses significant health and safety concerns. An alternative source is necessary to maintain electrochemical efficacy. This research demonstrates new safe glyme‐based electrolytes for silica/carbon (SiOx/...

The rapid growth of global energy consumption and the increasing demand for sustainable and renewable energy sources have urged vast research into harnessing energy from various sources. Among them, the most promising approaches are nanogenerators (NGs) and solar cells (SCs), which independently offer innovative solutions for energy harvesting. Thi...

Energy storage systems with non-metallic charge carriers such as ammonium-ion (NH4+) are inherently safe and enable large-scale storage. Unlike metal ions with spherical symmetry, the intercalation of ammonium ions with...

Exploring non-toxic, multiple oxidation state iron phosphate (Co 3 Fe 4 (PO 4 ) 6 ) anchored MWCNTs with blossomed micro platelets surface architecture as a supercapacitive electrode and design of a large-scale (10 × 4 cm ² ) symmetric device powering a DC fan.

This introductory book chapter aims to provide a brief overview of the current state of the art in supercapacitor technology. It will discuss the various materials used in supercapacitors and their properties, the design considerations for optimizing performance, and the potential applications of supercapacitors in energy storage, EVs, and portable...

The energy crises are currently the main challenges for human life. Promising solutions are expected from research on novel materials with a wide range of functional benefits. The new family...

Hybrid materials integrate unique organic and inorganic compounds to create innovative materials that harness the optimal characteristics of each component, enhancing the electrochemical performance. Herein, a novel lattice engineering strategy...

One-step hydrothermally synthesized over-oxidized Mo 3 Se 4 with enriched selenium exhibited a specific capacity of 1006.75 mA h g −1 at 0.1C.

With the increasing demand for portable electronic devices and the shortage of conventional energy resources, energy harvesting from natural resources has gained much attention. Herein, they proposed a black soldier fly (BSF) derived chitin biofilm to fabricate high‐performance triboelectric and piezoelectric nanogenerators. The physiochemical char...

Metal–organic frameworks (MOFs) represent a relatively new family of materials that attract lots of attention thanks to their unique features such as hierarchical porosity, active metal centers, versatility of linkers/metal nodes, and large surface area. Among the extended list of MOFs, Zr‐based‐MOFs demonstrate comparably superior chemical and the...

The surging adoption of lithium‐ion batteries, driven by diverse applications including electric vehicles, renewable energy storage, and portable electronics, has intensified the demand for high‐energy cathode materials. The existing methods to produce cathode materials typically include high‐temperature (>800 °C) sintering for a long period of tim...

Recent advancements in Ni material-based supercapacitors have focused on their composites with carbon nanomaterials. These composites demonstrate improved electrical conductivity, enhanced surface area, and superior electrochemical performance by addressing critical issues related to cycling stability and low energy density. This review provides an...

Urea oxidation reaction (UOR) is one of the promising alternative anodic reactions to water oxidation that has attracted extensive attention in green hydrogen production. The application of specifically designed electrocatalysts capable of declining energy consumption and environmental consequences is one of the major challenges in this field. Ther...

Materials Science and Engineering: B Volume 296, October 2023, 116638 Electrochemical detection of dopamine through hydrothermally prepared lanthanum metal–organic framework (La-BTC) /carbon nanotube nanohybrid Author links open overlay panelP.M. Rajaitha a, Sugato Hajra a, Aneeta Manjari Padhan a, Deepak Dubal b, Hoe Joon Kim a c Show more Share C...

Ultra‐high energy density battery‐type materials are promising candidates for supercapacitors (SCs); however, slow ion kinetics and significant volume expansion remain major barriers to their practical applications. To address these issues, hierarchical lattice distorted α‐/γ‐MnS@CoxSy core‐shell heterostructure constrained in the sulphur (S), nitr...

Nickel selenide is an emerging electrode material for high‐performance hybrid supercapacitors; however, poor electrical conductivity and sluggish ion kinetics limit its application. Herein, a unique architecture by decorating NiSe nanoparticles on reduced graphene oxides (rGO) is developed. The synergistic effect of NiSe and rGO facilitated by the...

Nature has gifted superior e-materials to many living organisms. This work investigates a keratinized hexagonal patterned snake ecdysis for advanced electronic applications. The snake ecdysis carries high porosity, flexibility, piezo-sensitivity, and tribopositivity. Furthermore, the presence of various functional groups and high keratinization are...

Nowadays, the increased emission of hazardous volatile organic compounds (VOCs) due to rapid growth in the manufacturing industry has enforced demand for highly sensitive, selective, and stable gas sensors. Among the different types of gas sensors, we resolved issues associated with chemoresistive alcohol sensors like low selectivity, temperature i...

Amid the rapid development of electric vehicles, a flexible and waterproof radiant heater that can withstand repeated bending and washing is highly desirable. Herein, a freestanding, ultra‐flexible, and washable joule heater is constructed using a biocompatible poly(styrene‐isoprene‐styrene) (SIBS) polymer as binder and carbon black (CB) as heating...

High‐energy‐density battery‐type materials have sparked considerable interest as supercapacitors electrode; however, their sluggish charge kinetics limits utilization of redox‐active sites, resulting in poor electrochemical performance. Here, the unique core–shell architecture of metal organic framework derived N–S codoped carbon@CoxSy micropetals...

Biocompatible energy-harvesting platforms can significantly promote the development of self-powered devices to improve the human lifestyle. However, the low power of these devices is a bottleneck and requires an alternative power source. Herein, we have developed calcium titanate (CTO) perovskite-based polymeric composite (polyvinylidene fluoride (...

Biomass-derived 5-(chloromethyl)furfural (CMF) recently has garnered increasing attention over 5-hydroxymethylfurfural (HMF) as a significant platform molecule for a wide spectrum of value-added chemical compounds. This is due to CMF being able to be produced in higher yields under mild conditions directly from raw biomass compared to HMF. In this...

Metal-organic gels (MOGs) emerged as a novel class of functional soft materials in which the scaffolding framework is fabricated by metal-ligand coordination in combination with other supramolecular interactions (for example, hydrogen bonding or π-π stacking). Through the combination of organic and inorganic (metal/metal-oxo clusters) building bloc...

Rechargeable aqueous zinc ion hybrid capacitors were developed in this work via engineering a Zn‐anode/electrolyte interface and 3D Graphene‐like Carbon Cathode. The designed hybrid device realizes the battery‐like specific energy (203 Wh kg–1) and supercapacitor‐type power capability (4.9 kW kg–1) and cycling stability (96.75% retention over 30000...

A facile conversion of hemicellulose to water-soluble xylooligosaccharides using a functionalized metal-free carbon catalyst was developed. The synergistic effect of both plasma irradiation and acidification to preferentially generate surface carboxylic acid and nitrogen groups on the carbon promoted the selective fractionation and depolymerization...

Rechargeable aqueous zinc ion hybrid capacitors (ZIHCs), as an up‐and‐comer aqueous electrochemical energy storage system, endure in their infancy because of the substandard reversibility of Zn anodes, structural deterioration of cathode materials, and narrow electrochemical stability window. Herein, a scalable approach is described that addresses...

Electroactive Polymers and Their Carbon Nanocomposites for Energy Harvesting

The energy crisis and depletion of non-renewable energy resources have been promoted as a result of the drastic rise of world pollution and the energy demand. Facile production of hydrogen through water splitting has become a popular alternative source of energy owing to the numerous environmentally friendly and economic benefits it provides. Addit...

With growing awareness of a circular economy, it is necessary to utilize all lignocellulose biomass com- ponents as a resource to maintain sustainability. We have selectively targeted the one-step conversion of hemicellulose in sugarcane bagasse to xylooligosaccharides (XOS), which are useful dietary supplements, while keeping the cellulose and lig...

Development of the Vanadium Redox Flow Battery (VRFB) has been widely reported but typically only focuses on one part of the cell (e.g. electrode, electrolyte, or membrane). Improvement to a single part of the cell may cause side effects on other parts during long-term cycling leading to an overall drop in the performance of the battery. To avoid t...

Reinstallation of industrial-grade electrode materials by recycling waste electrochemical energy storage devices is the best way to achieve excellent economic and environmental benefits. In this study, we repaired active carbon materials from end-of-life supercapacitors using simple thermal activation and back-integrated them into high-voltage and...

Herein, we have developed a novel hybrid material based on NiCo2S4 (NCS), halloysite nanotubes (HNTs), and carbon as promising electrodes for supercapacitors (SCs). Firstly, mesoporous NCS nanoflakes were prepared by co-precipitation method followed by physically mixing with HNTs and carbon, and screen printed on nickel foam. After ultrasonication,...

High Performance Piezoelectric Supercapacitors In article number 2100550, Deepak Dupal and colleagues demonstrate how the development of MXene incorporated polymer matrix paves a way towards high performance piezoelectric supercapacitors as integrated energy harvesting and storing technology for next‐generation self‐powered implantable and wearable...

The disposal of expired pharmaceutical drugs is largely unattended, which leads to massive environmental pollution. Herein, a novel strategy is demonstrated to turn expired drugs into a novel tribopositive material in a triboelectric nanogenerator (TENG). To realize the proposed method, three types of expired tablets such as paracetamol, nimesulide...