Clean energy and hydrogen in their operating context

Pr Khaled Charradi

Senior Expert in Hydrogen and Energy Storage

Khaled Charradi specialises in hydrogen and energy storage.

Dr Sahbi Hamrouni

PhD in Physics

Sahbi Hamrouni holds a PhD in Physics.

Mohamed Khayri Rahmani

PhD in Electrical Engineering

Mohamed Khayri Rahmani holds a PhD in Electrical Engineering and researches AI-driven energy efficiency and intelligent control.

2026-06-15 · Ionics

Dual‑functionalized sulfonated poly (arylene ether sulfone) membranes with sulfonamide crosslinks and octyl grafts for intermediate‑temperature proton exchange fuel cells

Qana A. Alsulami; Walid Mabrouk; Sherif M. A. S. Keshk

Fluorine‐free proton exchange membranes are increasingly required to replace perfluoro sulfonic acid (PFAS) materials in hydrogen fuel cells operating at low humidity and moderate temperatures. In this work, a one‐step grafting–crosslinking strategy was used to fabricate…

2026-05 · Materials Science and Engineering: B

Interfacial modulation in OPVA–ZnO–GO nanocomposites for enhanced proton transport and emission control

Ridha Elleuch; Khaled Charradi; Abdullah Y.A. Alzahrani; et al.

Flexible electronic platforms require polymer nanocomposites that integrate high optical transparency, tunable photoluminescence (PL), and efficient proton transport. Conventional poly(vinyl alcohol) (PVA) systems often suffer from limited chain mobility and poor nanoparticle dispersion, leading to trade-offs…

2026-02-02 · Materials for Renewable and Sustainable Energy

Fabrication of transparent, dopant-free OPVA–GO nanocomposites with tunable proton conductivity and optical transparency for photonic and energy applications

Qana A. Alsulami; Khaled Charradi; Fatmah M. Alshareef; et al.

Polyvinyl alcohol (PVA) is valued for its transparency and film-forming ability, but its limited chemical reactivity and weak nanofiller interactions restrict functional tunability. Partially oxidized PVA (OPVA), enriched with ketone and hydroxyl groups, provides a versatile…

2026-01 · Journal of Alloys and Compounds

Interfacial energy transfer and charge separation in rGO/Y2O3/ZnO: Er,Yb plasmonic hybrid nanostructures for photovoltaic enhancement

Ridha Elleuch; Marwa ben Chobba; Jean-Luc Deschanvres; et al.

This study presents a multifunctional hybrid system constructed by interfacing thermally reduced graphene oxide (rGO) nanoflakes with rare-earth-doped Y2O3/ZnO: Er,Yb thin films designed to achieve near-field optical modulation and enhanced charge transport. Here, the rGO layers…

2026-01 · Journal of Physics and Chemistry of Solids

Enhanced lithium-ion transport in oxidized polyvinyl alcohol/La0·56Li0·33TiO3 hybrid electrolytes for solid-state batteries

Amira Siai; Abdullah Y.A.AL. Zahrani; Radhouane Chtourou; et al.

This study explores the electrical and dielectric properties of hybrid solid electrolytes made from hydrothermally synthesized La0·56Li0·33TiO3 (LLTO) oxide and oxidized polyvinyl alcohol (OPVA). The influence of LLTO on ionic conductivity and dielectric behavior was assessed…

2025-12 · Applied Clay Science

Functionalized clay nanocomposites for enhanced proton conductivity in polyether-based fuel cell membranes

Youssef O. Al-Ghamdi; Sherif M.A.S. Keshk

This review critically examines the recent progress in the development of sulfonated polyether sulfone (SPES) and its derivatives (including sulfonated polyether sulfone with open sulfonic acid groups (SPESOS)) as functional matrices for next-generation proton exchange membrane…

2025-11-26 · Materials for Renewable and Sustainable Energy

Dual proton transport in Schiff base-modified chitosan functionalized with AMPS for fuel cell applications

Sonia Jebri; Walid Mabrouk; Ridha Elleuch; et al.

Proton exchange membranes (PEMs) require high proton conductivity, stability, and durability for fuel cell applications. This study reports the synthesis of N-(2-acrylamido-2-methylpropane sulfonyl) chitosan (CSB) via Schiff base functionalization with 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and the…

2025-11 · Materials Science and Engineering: B

In-situ synthesis of ZnO nanoparticles in oxidized polyvinyl alcohol nanocomposites for tunable optoelectronic and proton conductive performance

Ridha Elleuch; Maryam mallek; Khaled Charradi; et al.

This work presents the in-situ synthesis of zinc oxide (ZnO) nanoparticles in an oxidized polyvinyl alcohol (OPVA) matrix, which greatly enhances the final nanocomposites optical, mechanical, and proton conductive properties. Zinc acetate was used as a…

2025-06-24 · Emergent Materials

High-performance OPVA/CMC hybrid biopolymer electrolyte with enhanced proton conductivity for SBPE applications

Zoubaida Landolsi; Khaled Charradi; Walid Mabrouk; et al.

A novel solid biopolymer electrolyte (SBPE) hybrid was developed by directly linking oxidized polyvinyl alcohol (OPVA) with carboxymethyl cellulose (CMC) via ester formation. The CMC used in this study had a degree of substitution (DS) of…

Active · 2026–2028

LEAPES — Bio-based membranes and catalysts for fuel cells and green hydrogen

Research into bio-based membranes and catalysts for proton exchange membrane fuel cells and green hydrogen electrolyzers.

Horizon Europe Collaborative Proposal

BIO-MICRO-GRADE

BIO-MICRO-GRADE is a European collaborative research proposal focused on developing a new generation of sustainable, bio-derived materials for solid-state energy storage.