A5083714894- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Advanced Battery Materials and Technologies
- Fuel Cells and Related Materials
- Advanced Sensor and Energy Harvesting Materials
- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Synthesis and properties of polymers
- Advanced Memory and Neural Computing
- Polyoxometalates: Synthesis and Applications
- Electrochemical sensors and biosensors
- Hybrid Renewable Energy Systems
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Organic Electronics and Photovoltaics
- Electrospun Nanofibers in Biomedical Applications
University College London
2021-2025
The Faraday Institution
2022-2025
National Chemical Laboratory
2015-2020
Academy of Scientific and Innovative Research
2015-2020
Tokyo Institute of Technology
2020
A scalable method to produce flexible PEDOT/cellulose paper by surfactant-free interfacial polymerization is developed and its application demonstrated for a solid-state supercapacitor.
Electrochemical impedance spectroscopy (EIS) is widely used in battery analysis as it simple to implement and non-destructive. However, the data provided a global representation of all electrochemical processes within cell much useful information ambiguous or inaccessible when using traditional techniques. This major challenge EIS analyse systems with complex chemistries, like lithium-sulfur (Li-S), one strongest candidates supersede conventional Li-ion batteries. Here we demonstrate...
Transition metal oxide derived materials are very important for various applications, such as electronics, magnetism, catalysis, electrochemical energy conversion, and storage. Development of efficient durable catalysts the oxygen reduction reaction (ORR), an in fuel cells metal–air batteries, is highly desirable. Moreover, futuristic these applications need to be cost-effective order ensure a competitive edge devices market. This article describes synthesis electrocatalyst ORR. It based on...
Conjugated donor–acceptor copolymers based on naphthalene diimide (NDI) as acceptor and thiophene-terminated oligophenylenevinylene donor moieties (P1 P2, respectively) were synthesized using the direct (hetero) arylation (DHAP) polymerization route. Nitrile groups introduced at vinylene linkage in one copolymer (P2) to fine-tune its electrochemical properties. Both polymers show π–π* transition 300–480 nm region intramolecular charge transfer (ICT) from thiophene NDI 500–800 absorption...
Polyaniline (PANI) as a pseudocapacitive material has very high theoretical capacitance of 2000 F g–1. However, its practical been limited by low electrochemical surface area (ESA) and unfavorable wettability toward aqueous electrolytes. This work deals with strategy wherein the ESA PANI achieved induction superhydrophilicity together alignment exclusively on carbon fibers thin layer to form hybrid assembly. Superhydrophilicity is induced functionalization Toray paper, which further induces...
While lithium-sulfur (Li-S) batteries are a promising next-generation technology, their complex chemistry means they can degrade and fail via numerous mechanisms. To minimize or overcome these modes of failure, we must develop tools that differentiate between chemical processes in the operating cell, reveal effects on cell health, monitor cells throughout lifetimes. In this study undertake comprehensive investigation failure exhibited by Li-S cells, using distribution relaxation times (DRT)...
Abstract The cycling performance of lithium‐sulfur (Li−S) batteries is hampered by polysulfide dissolution which impacts the overall Li−S batteries. Here we report synthesis and characterization trapping cathode material for based on Co 3 O 4 nanocubes supported within a nitrogen‐doped entangled graphene (Co /NEGF). highly porous conductive network shown to facilitate fast electron transport ion diffusion while nitrogen dopants polar offer both abundant active sites conversion promoting...
Here, we report the preparation of a flexible, free-standing, Pt- and TCO-free counter electrode in dye-sensitized solar cell (DSSC)-derived from polyethylenedioxythiophene (PEDOT)-impregnated cellulose paper. The synthetic strategy making thin flexible PEDOT paper is simple scalable, which can be achieved via situ polymerization all through roll coating technique. very low sheet resistance (4 Ω/□) obtained film 40 μm thick (PEDOT-p-5) found to superior conventional fluorine-doped tin oxide...
Fe-Nx and Fe-S-based ORR electrocatalysts have emerged as rightful candidates to replace Pt in fuel cells make the technology cheap sustainable. Fe-N-C catalysts are generally prepared by pyrolysis of conducting polymers, metal-organic frameworks, aerogels, etc., combination multiple heteroatoms metal precursors. These precursors mostly expensive their synthesis involves steps. In this report, we demonstrated a catalyst from waste leather obtained footwear other leather-consuming industries....
Donor–acceptor pi-conjugated polymers are emerging as interesting electrode materials for supercapacitor device applications. They offer an exciting possibility of charge storage in both positive and negative electrodes because they p- n-dopable. The ambipolar charging enables higher operating voltage, which can afford specific energy power densities. donor–acceptor design be either donor-alternate-acceptor or donor-random-acceptor. This architectural variation has the potential to modify...
A highly efficient all-solid-state asymmetric supercapacitor device fabricated using electrodeposited V<sub>2</sub>O<sub>5</sub> with a non-aqueous polymer gel electrolyte.
Commercial platinum-supported carbon (Pt/C) catalyst is the most widely used oxygen reduction reaction (ORR) electrocatalyst in polymer electrolyte membrane fuel cells (PEMFCs). However, oxidation Pt/C during operation of PEMFCs poses serious issues, particularly meeting long-term durability cells. Although carbon-free Pt-based catalysts are considered to be best alternatives, single-cell performances reported for many such systems found inferior that carbon-based systems. As a practical way...
Stability of 2D MoS<sub>2</sub> nanomaterial is due to cage structure SC6 and it acts as an active nucleation site for anchoring PANI nanostructure. Calixarene plays a positive synergistic effect in by improvement overall electrochemical performance.
It is widely accepted that the commercial application of lithium-sulfur batteries inhibited by their short cycle life, which primarily caused a combination Li dendrite formation and active material loss due to polysulfide shuttling. Unfortunately, while numerous approaches overcome these problems have been reported, most are unscalable hence further hinder Li-S battery commercialization. Most suggested also only tackle one primary mechanisms cell degradation failure. Here, we demonstrate use...
A carbon–iron cyclotetraphosphate composite derived from the pyrolysis of a ferric phytate gel is demonstrated as high-performance and highly durable capacitive material.
Abstract Resistance of the electrode material play a vital role for applications in supercapacitors, where lowering resistance leads to improved performance. Poly(3,4‐ethylene dioxythiophene) (PEDOT) possesses high theoretical conductivity; however, density grain boundaries, low accessible surface area, and rate capability have been pervasive issues affecting PEDOT‐based supercapacitors. To this end, hydrothermal method is proposed work oxygen functional groups incorporated on carbon...
Abstract Commercially available platinum‐supported carbon (Pt/C) catalysts are the most widely used oxygen reduction reaction (ORR) electrocatalysts in polymer electrolyte membrane fuel cells (PEMFCs). However, inadequate active triple‐phase boundary formation and oxidation Pt/C during PEMFC operation shorten its lifetime efficiency. In this direction, a new class of carbon‐free for ORR is prepared by dispersing Pt nanoparticles on ZrP (Zirconium phosphates) nanoplates. one case (ZrP@Pt),...
Even though various Pt-free electrocatalysts for oxygen reduction reaction (ORR) have been introduced, many of them are found to be active only in alkaline conditions. Considering Nafion, phosphoric acid-doped polybenzimidazole (PBI), and so on as the prominent ionomer membranes, used commercially available polymer electrolyte membrane fuel cells (PEMFCs), it becomes important that any development catalysts should ensure better ORR performance under acidic The present work effectively...
Abstract A flexible solid‐state supercapacitor is prepared from carbon nanotube (CNT)‐based buckypaper after forming a thin layer of polyethylenedioxythiophene (PEDOT) on the surface CNTs in paper. highly conducting PEDOT phase obtained by interfacial polymerization, which polymerization confined at interface two immiscible liquids. The hydrophilic interaction between functionalized and oxidizing agent (iron perchlorate, Fe(ClO 4 ) 3 ), located aqueous phase, restricted with EDOT monomer...
Development of flexible supercapacitors is limited by the availability and durable conducting substrates; a cheap substrate for active material deposition essential breakthrough progress in this direction.
The development of an economical, eco-friendly, and easy method for the production carbon nanosheets heteroatom-doped has been a challenge material scientists. In this study, we developed synthesis (CNS) nitrogen-doped (NCNS) high quality from organic compounds. We exploited electrostatic interaction among ionic crystals (NaCl in present case) polarized aromatic molecules (3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) 3,4,9,10-perylene diimide (PTCDI) work) to obtain uniform coverage...
An electrocatalyst comprising PdP nanoparticles anchored over WO 3 nanorods (PdP/WO ) was prepared, which acts as a carbon-free system with multi-functional activity for ORR, MOR, and FOR in Direct Liquid Fuel Cells (DLFCs).
Abstract Iron and cobalt metal atoms are effective active centers for the synthesis of carbon‐based noble‐metal‐free catalysts oxygen reduction reaction (ORR) owing to their cost‐effective intrinsic activity tunable properties. Annealing center with conducting carbon enhances ORR significantly. Herein, we have engrafted Fe Co in homemade performance has been closely observed under acidic basic pH conditions understand influence medium participating moieties towards performance. In half‐cell...
Abstract Aqueous Zn‐ion batteries (AZIBs) are widely acknowledged as viable future energy storage solutions, particularly for low‐cost stationary applications. However, the interfacial instability of zinc anodes represents a major challenge to commercial potential systems, promoting an array side reactions including spontaneous corrosion, hydrogen evolution, and dendrite growth that destabilize cell performance, lower Coulombic efficiency ultimately lead early failure. While other...