Publications de Kumar Varoon Agrawal

Print-light-synthesis of electrocatalytically active gas diffusion electrodes for fuel cell applications

Hubert Girault, Kumar Varoon Agrawal, Luc Sébastien Bondaz

The present work reports a simple approach to manufacture electrocatalytically active gas diffusion electrodes (GDEs) in two steps: (i) inkjet printing and (ii) flash light irradiation from a xenon flash lamp, a process called Print-light-synthesis (PLS). ...

Royal Society of Chemistry2025

Non-van-der-Waals Oriented Two-Dimensional UiO-66 Films by Rapid Aqueous Synthesis at Room Temperature

Wendy Lee Queen, Kumar Varoon Agrawal, Kuang-Jung Hsu, Heng-Yu Chi, Shuqing Song, Ranadip Goswami, Kangning Zhao, Qi Liu

The synthesis of MOFs in a two-dimensional (2D) film morphology is attractive for several applications including molecular and ionic separation. However, 2D MOFs have only been reported from structures that crystallize in lamellar morphology, where layers ...

2025

Modulation of Graphene Oxidation Using Substrate-Induced Electron-Hole Puddles for Advancing Molecular Separation

Kumar Varoon Agrawal, Kuang-Jung Hsu, Heng-Yu Chi, Ranadip Goswami, Shiqi Huang

Tuning the reactivity of graphene enables molecular-level engineering of the lattice, achieving desired chemical and structural properties through functionalization, doping, and etching. Atom-thin graphene film hosting Å-scale pores, with capability to dif ...

2025

Anisotropic node distortions in amorphous MOFs: Low-valent Zr sites as catalytic hotspots

Berend Smit, Wendy Lee Queen, Emad Oveisi, Kumar Varoon Agrawal, Jian Hao, Till Marian Schertenleib, Beatriz Bueno Mouriño, Timo Markus Oskar Felder, Vikram Vinayak Karve, Andres Adolfo Ortega Guerrero

We introduce a new approach to defect engineering in Zr-based metal-organic frameworks (Zr-MOFs), aiming to reduce Zr site valency while preserving high node connectivity. Using a rapid heat treatment (RHT) in humid air, oxygen vacancies (O-vacancies) were ...

Elsevier BV2025

Advancing membrane science via two-dimensional materials

Kumar Varoon Agrawal

2025

Angstrom‐Scale Triangular Pore in Single‐Layer Hexagonal Boron Nitride Membrane for Molecular Sieving

Kumar Varoon Agrawal, Heng-Yu Chi, Luis Francisco Villalobos Vazquez de la Parra

Single‐layer crystalline films are ideal separation membrane materials because their atomic thickness could yield the highest possible molecular flux once nanopores are generated. However, the development of single‐layer membranes with well‐defined pore st ...

Wiley2025

Stereochemical tuning, post-synthesis crosslinking and quaternizing to tune the membrane performance of ultra-stable polyamine nanofiltration membranes

Kumar Varoon Agrawal, Cédric Karel J Van Goethem

Solvent resistant and pH-stable nanofiltration membranes play a crucial role in solvent or water reuse across various industries, including pharma, chemical, dairy and mining, where stringent pH conditions and chemical stability are imperative. Previous re ...

2025

Optimization of crosslinking in Poly(vinylidene fluoride) membranes for solvent-resistant nanofiltration: a comparative study between crosslinking agents

Kumar Varoon Agrawal, Cédric Karel J Van Goethem

This study presents an optimized and scalable crosslinking approach for poly(vinylidene fluoride) (PVDF) membranes in solvent-resistant nanofiltration (SRNF), emphasizing cost efficiency, safety, and environmental sustainability. The effect of four swellin ...

2025

A molecularly engineered large-area nanoporous atomically thin graphene membrane for ion separation

Kumar Varoon Agrawal

Atomically thin graphene membranes with sub-1-nm pores show promise for ion/molecular separation, osmotic energy generation, and energy storage. Narrowing the pore size distribution and controlling the surface charge are essential to achieve these applicat ...

Springer Science and Business Media LLC2025

Nanolithography of the nanocorral structure of chemisorbed oxygen atoms on the graphitic lattice

Kumar Varoon Agrawal, Shaoxian Li

Controlled atomic patterning is an attractive tool to fine tune properties of graphitic lattice. Several O-functionalized derivatives of graphitic lattice have been widely studied, e.g., graphene oxide, reduced graphene oxide, and functionalized carbon nan ...

Pergamon-Elsevier Science Ltd2024