Search results for: Walid A. Daoud

Items from 1 to 20 out of 52 results

article

Amoeba‐Inspired Self‐Healing Electronic Slime for Adaptable, Durable Epidermal Wearable Electronics

Yu Feng, Cong Wu, Meng Chen, Hui Sun, more

Advanced Functional Materials > 34 > 37 > n/a - n/a

Epidermal electronics has garnered significant research attention due to its promising applications in wearable human‐machine interfaces and intelligent healthcare sensing. However, their widespread use faces challenges due to complex manufacturing processes, high material costs, inadaptability to different skin surfaces, and inadequate reusability. Herein, inspired by the biological reshapability...

article

Surfactant Self‐Assembly Enhances Tribopositivity of Stretchable Ionic Conductors for Wearable Energy Harvesting and Motion Sensing

Xiangkun Bo, Hong Zhao, Agnes Valencia, Fei Liu, more

Advanced Materials > 36 > 32 > n/a - n/a

Boosting stretchability and electric output is critical for high‐performance wearable triboelectric nanogenerators (TENG). Herein, for the first time, a new approach for tuning the composition of surface functional groups through surfactant self‐assembly to improve the tribopositivity, where the assembly increases the transferred charge density and the relative permittivity of water polyurethane (WPU)...

article

Decoupling Activation and Transport by Electron‐Regulated Atomic‐Bi Harnessed Surface‐to‐Pore Interface for Vanadium Redox Flow Battery (Adv. Mater. 6/2024)

Xiangyang Zhang, Agnes Valencia, Weilu Li, Kelong Ao, more

Advanced Materials > 36 > 6 > n/a - n/a

Vanadium Redox Flow Batteries In article number 2305415, Xiangyang Zhang, Walid A. Daoud, and co‐workers report a surface‐to‐pore catalytic interface structured electrode that is designed and implemented in vanadium redox flow battery (VRFB), therein lies the concept of decoupling the activation and transport processes. This study addresses a critical challenge in conventional catalyst designs, aiming...

article

Decoupling Activation and Transport by Electron‐Regulated Atomic‐Bi Harnessed Surface‐to‐Pore Interface for Vanadium Redox Flow Battery

Xiangyang Zhang, Agnes Valencia, Weilu Li, Kelong Ao, more

Advanced Materials > 36 > 6 > n/a - n/a

Vanadium redox flow battery (VRFB) promises a route to low‐cost and grid‐scale electricity storage using renewable energy resources. However, the interplay of mass transport and activation processes of high‐loading catalysts makes it challenging to drive high‐performance density VRFB. Herein, a surface‐to‐pore interface design that unlocks the potential of atomic‐Bi‐exposed catalytic surface via decoupling...

article

A Stretchable Solid Ionic Electrode‐Based Triboelectric Nanogenerator for Biomechanical Energy Harvesting and Self‐Powered Sensors

Xiangkun Bo, Lingyun Wang, Hong Zhao, Jasim M. Almardi, more

Small > 19 > 38 > n/a - n/a

Stretchable power devices and self‐powered sensors have become increasingly desired for wearable electronics and artificial intelligence. In this study, an all‐solid‐state triboelectric nanogenerator (TENG) is reported, whose one solid‐state structure prevents delamination during stretch and release cycles and increasing the patch adhesive force (3.5 N) and strain (586% elongation at break). Through...

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High‐Performance Biomechanical Energy Harvester Enabled by Switching Interfacial Adhesion via Hydrogen Bonding and Phase Separation (Adv. Funct. Mater. 38/2022)

Lingyun Wang, Yu Wang, Xiangkun Bo, Haoyu Wang, more

Advanced Functional Materials > 32 > 38 > n/a - n/a

Biomechanical Energy Harvesters In article number 2204304, William W. Yu, Wen Jung Li, Walid A. Daoud, and co‐workers demonstrate a high‐performance flexible biomechanical energy harvester by switching its interfacial adhesion via hydrogen bonding interactions and solvent evaporation induced phase separation. This wearable power source can generate a record high peak power density of 20.5 W m⁻² Hz...

article

High‐Performance Biomechanical Energy Harvester Enabled by Switching Interfacial Adhesion via Hydrogen Bonding and Phase Separation

Lingyun Wang, Yu Wang, Xiangkun Bo, Haoyu Wang, more

Advanced Functional Materials > 32 > 38 > n/a - n/a

Dramatic advances in wearable electronics have triggered tremendous demands for wearable power sources. To mitigate the impact of CO₂ emission on the environment caused by energy consumption, biomechanical energy harvesting for self‐powered wearable electronics offers a promising solution. The output power of devices largely relies on the surface charge density, where adhesion interfaces generate...

article

Seed‐Assisted Growth for Low‐Temperature‐Processed All‐Inorganic CsPbIBr₂ Solar Cells with Efficiency over 10%

Weihai Zhang, Juan Xiong, Jinhua Li, Walid A. Daoud

Small > 16 > 24 > n/a - n/a

All‐inorganic CsPbIBr₂ perovskite has recently received growing attention due to its balanced band gap and excellent environmental stability. However, the requirement of high‐temperature processing limits its application in flexible devices. Herein, a low‐temperature seed‐assisted growth (SAG) method for high‐quality CsPbIBr₂ perovskite films through reducing the crystallization temperature by introducing...

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Design parameters impact on output characteristics of flexible hybrid energy harvesting generator: Experimental and theoretical simulation based on a parallel hybrid model

Xiya Yang, Walid A. Daoud

Nano Energy > 2018 > 50 > C > 794-806

The impact of design and external parameters on the intrinsic output properties and load characteristics of hybrid energy harvesting generator is significant in both designing the generator and power management circuit and achieving high energy conversion efficiency. In this work, the intrinsic output characteristics of a hybrid triboelectric and piezoelectric generator is investigated, where the...

article

Water tank triboelectric nanogenerator for efficient harvesting of water wave energy over a broad frequency range

Xiya Yang, Szeyan Chan, Lingyun Wang, Walid A. Daoud

Nano Energy > 2018 > 44 > C > 388-398

A water tank triboelectric nanogenerator based on polytetrafluoroethylene (PTFE) is fabricated for harvesting water wave energy. The impacts of contact frequency over a broad frequency range including the frequency range of ocean waves and output characteristics under resistive and capacitive loads for different liquid types are investigated in order to identify the optimal contact frequency and load...

article

Efficient ZnO aqueous nanoparticle catalysed lactide synthesis for poly(lactic acid) fibre production from food waste

Yunzi Hu, Walid A. Daoud, Bin Fei, Lei Chen, more

Journal of Cleaner Production > 2017 > 165 > C > 157-167

This study demonstrates the feasibility of poly(lactic acid) fibre production using fermentative lactic acid from food waste. Poly(lactic acid) was synthesized through ring-opening polymerization, in which the precursor lactide was produced by a novel catalytic method. Zinc oxide aqueous nanoparticle (30–40 nm) dispersion was applied as efficient catalyst due to its large surface area and rapid equilibrium...

article

CH3NH3PbI3−xBrx perovskite solar cells via spray assisted two-step deposition: Impact of bromide on stability and cell performance

Gaoda Chai, Shiqiang Luo, Hang Zhou, Walid A. Daoud

Materials & Design > 2017 > 125 > C > 222-229

Fully converting the lead salt to perovskite is crucial for the performance of perovskite solar cells via the two-step deposition method. In this study, full conversion of PbI₂ to perovskite is achieved via a spray assisted two-step deposition method with excess CH₃NH₃I sprayed onto the PbI₂ layer. The influence of adding CH₃NH₃Br in the PbI₂ solution in the first step on the resulting solar cells...

article

Enhanced antimicrobial coating on cotton and its impact on UV protection and physical characteristics

Esfandiar Pakdel, Walid A. Daoud, Tarannum Afrin, Lu Sun, more

Cellulose > 2017 > 24 > 9 > 4003-4015

This research intends to enhance the antimicrobial activity of cotton fabrics coated with metallized TiO₂-based colloids through integrating noble metals (Ag, Au) and silica in the synthesis process. Colloids were synthesized through a low-temperature sol–gel method and applied to the surface of fabrics at ambient temperature. Four molar ratios of metal to TiO₂ (0.01, 0.1, 0.5 and 1%) were used in...

article

Advances in hybrid solar photovoltaic and thermoelectric generators

Priscilla Huen, Walid A. Daoud

Renewable and Sustainable Energy Reviews > 2017 > 72 > C > 1295-1302

Development of renewable energies, particularly solar energy, is crucial for meeting future energy needs. Solar light and thermal energy can provide sufficient electricity needed in daily life. In this pursuit, photovoltaics and thermoelectrics have been developing for energy conversion. While photovoltaics mainly convert the UV and visible regions of the solar spectrum, thermoelectrics utilize the...

article

Continuous ultrasonic-mediated solvent extraction of lactic acid from fermentation broths

Yunzi Hu, Tsz Him Kwan, Walid A. Daoud, Carol Sze Ki Lin

Journal of Cleaner Production > 2017 > 145 > C > 142-150

A novel method of lactic acid recovery from fermentation broths by continuous ultrasonic solvent extraction is disclosed in this study. Fermentation broths from defined medium, mixed food waste hydrolysate and bakery waste hydrolysate were employed. Ultrasonication was applied to improve the extraction efficiency combined with ethyl acetate optimum solvent to replace conventional amine-based complex...

article

Nanogenerators: Triboelectric and Piezoelectric Effects in a Combined Tribo‐Piezoelectric Nanogenerator Based on an Interfacial ZnO Nanostructure (Adv. Funct. Mater. 45/2016)

Xiya Yang, Walid A. Daoud

Advanced Functional Materials > 26 > 45 > 8355 - 8355

The individual triboelectricity and piezoelectricity generation form a combined effect generator is investigated by X. Y. Yang and W. A. Daoud on page 8194. Consisting of aluminum‐polydimethylsiloxane/polyvinylidene fluoride composite carbon, the generator delivers an excellent output upon surface modification with ZnO nanorods. By combining high output with efficient energy generation, the device...

article

Triboelectric and Piezoelectric Effects in a Combined Tribo‐Piezoelectric Nanogenerator Based on an Interfacial ZnO Nanostructure

Xiya Yang, Walid A. Daoud

Advanced Functional Materials > 26 > 45 > 8194 - 8201

In this contribution, combined triboelectric and piezoelectric generators (TPEG) with a sandwich structure of aluminum‐polydimethylsiloxane/polyvinylidene fluoride composite‐carbon (Al‐PPCF‐Carbon) are fabricated for the purpose of mechanical energy harvesting. Improved by the surface modification of PPCF with zinc oxide (ZnO) nanorods through a hydrothermal method, the TPEG generates an open‐circuit...

article

Temperature influence on the reaction kinetics of V(IV)/V(V) in methanesulfonic acid for all-vanadium redox flow battery

Qiuhong Wang, Walid A. Daoud

Electrochimica Acta > 2016 > 214 > C > 11-18

In this study, methanesulfonic acid has been investigated as the supporting electrolyte for vanadium solutions due to the improvement of mass transfer rate and reaction kinetics. Here, we applied different temperatures (0–55°C) for electrochemical experiments of 0.1M vanadium ions in 1.0M MSA electrolyte on gold, platinum and glassy carbon electrodes separately to study the temperature-related kinetics...

article

Vanadium microfluidic fuel cell with novel multi-layer flow-through porous electrodes: Model, simulations and experiments

Li Li, Georgios Nikiforidis, Michael K.H. Leung, Walid A. Daoud

Applied Energy > 2016 > 177 > C > 729-739

This paper presents computational and experimental studies of a vanadium microfluidic fuel cell using a novel configuration of multi-layer flow-through porous carbon paper electrodes. A priori modeling and simulation revealed that these porous substrates operated with non-uniform reaction rate and the reaction rate distribution is highly sensitive to the flow rate condition. Comparable cell performance...

article

The influence of chloride on interdiffusion method for perovskite solar cells

Shiqiang Luo, Peng You, Gaoda Cai, Hang Zhou, more

Materials Letters > 2016 > 169 > C > 236-240

Fully converting the lead salt to perovskite is crucial for the performance of the perovskite solar cells via the sequential deposition method. By applying mixture of PbI₂ and PbCl₂ as the lead salts here, a fast conversion rate was found and a new PbICl phase was involved.

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INFONA - science communication portal

Search results for: Walid A. Daoud

Amoeba‐Inspired Self‐Healing Electronic Slime for Adaptable, Durable Epidermal Wearable Electronics

Surfactant Self‐Assembly Enhances Tribopositivity of Stretchable Ionic Conductors for Wearable Energy Harvesting and Motion Sensing

Decoupling Activation and Transport by Electron‐Regulated Atomic‐Bi Harnessed Surface‐to‐Pore Interface for Vanadium Redox Flow Battery (Adv. Mater. 6/2024)

Decoupling Activation and Transport by Electron‐Regulated Atomic‐Bi Harnessed Surface‐to‐Pore Interface for Vanadium Redox Flow Battery

A Stretchable Solid Ionic Electrode‐Based Triboelectric Nanogenerator for Biomechanical Energy Harvesting and Self‐Powered Sensors

High‐Performance Biomechanical Energy Harvester Enabled by Switching Interfacial Adhesion via Hydrogen Bonding and Phase Separation (Adv. Funct. Mater. 38/2022)

High‐Performance Biomechanical Energy Harvester Enabled by Switching Interfacial Adhesion via Hydrogen Bonding and Phase Separation

Seed‐Assisted Growth for Low‐Temperature‐Processed All‐Inorganic CsPbIBr₂ Solar Cells with Efficiency over 10%

Design parameters impact on output characteristics of flexible hybrid energy harvesting generator: Experimental and theoretical simulation based on a parallel hybrid model

Water tank triboelectric nanogenerator for efficient harvesting of water wave energy over a broad frequency range

Efficient ZnO aqueous nanoparticle catalysed lactide synthesis for poly(lactic acid) fibre production from food waste

CH3NH3PbI3−xBrx perovskite solar cells via spray assisted two-step deposition: Impact of bromide on stability and cell performance

Enhanced antimicrobial coating on cotton and its impact on UV protection and physical characteristics

Advances in hybrid solar photovoltaic and thermoelectric generators

Continuous ultrasonic-mediated solvent extraction of lactic acid from fermentation broths

Nanogenerators: Triboelectric and Piezoelectric Effects in a Combined Tribo‐Piezoelectric Nanogenerator Based on an Interfacial ZnO Nanostructure (Adv. Funct. Mater. 45/2016)

Triboelectric and Piezoelectric Effects in a Combined Tribo‐Piezoelectric Nanogenerator Based on an Interfacial ZnO Nanostructure

Temperature influence on the reaction kinetics of V(IV)/V(V) in methanesulfonic acid for all-vanadium redox flow battery

Vanadium microfluidic fuel cell with novel multi-layer flow-through porous electrodes: Model, simulations and experiments

The influence of chloride on interdiffusion method for perovskite solar cells

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