Institut Català de Nanociència i Nanotecnologia

Product‐Reshaped Gas‐Phase Hydrodynamics Govern CO 2 Electrolysis in Gas Diffusion Electrodes

ABSTRACT High‐rate electrolysis is commonly assessed using current density, single‐pass conversion and Faradaic efficiency, but these global metrics do not indicate whether the local reaction environment required for selective multicarbon formation is preserved during scale‐up. U...

Bandwidth-Limited Critical Currents in Electrically Tunable Moire Bands

Abstract Moiré superlattices host narrow minibands whose bandwidth governs correlated and topological phases. Here, we demonstrate that the bandwidth also sets the critical current for the onset of out-of-equilibrium transport. In bilayer graphene aligned to hexagonal boron nitr...

Oxygen Management in Ruthenium–Cerium Anode Facilitates Water Adsorption and Bubble Desorption for Oxygen Evolution at High Current Densities

Abstract The production of hydrogen via acidic water electrolysis requires efficient oxygen evolution reaction (OER) at high current densities. However, this is often limited by oxygen bubble accumulation, which blocks active sites and restricts water access. Although bubble rele...

Microsecond-pulsed nanocalorimetry: a scalable approach for ultrasensitive heat capacity measurements

Abstract We introduce a nanocalorimetric technique based on microsecond-pulsed heating (µs-PHnC) that enables high-sensitivity, quasi-isothermal heat capacity measurements on nanoscale samples. Such resolution is critical for exploring thermodynamic signatures in low-dimensional...

Graphene-based Photodetector with Engineered Hot-Carrier Cooling Dynamics

Abstract Graphene has emerged as a promising material for integration into silicon photonics, owing to its ultrafast and broadband photoresponse without the need for an external bias voltage. This photoresponse relies on the photo-thermoelectric effect created by hot carriers. A...

Evanescent Absorption Spectroscopy of Transition Metal Dichalcogenide Materials Using Guided Photoluminescence in Si3N4 Photonic Waveguides

Abstract On-chip integration of two-dimensional transition metal dichalcogenides (TMDs) with photonic waveguides underpins a growing class of compact optoelectronic and sensing devices, whose performance depends on the optical absorption of the two-dimensional (2D) material in th...

Effects of Polyaromatic Film Interfaces on Cu Catalysts for Selective Electrochemical CO2 Reduction

Abstract Electrochemical CO2 reduction (CO2RR) offers a sustainable pathway to convert CO2 into energy-dense fuels and value-added chemicals, addressing both climate and energy storage challenges. This study investigates the effect of polyaromatic film (PAF) coatings on Cu-based...

Synergistic Surface/Bulk Charge Modulation Enables Record-Level Photocurrent in Hematite Photoanodes without Co-Catalysts for Photoelectrochemical Water Splitting

Abstract Hematite (α-Fe2O3) photoanodes are limited by poor bulk conductivity and severe surface recombination, which hinder their photoelectrochemical (PEC) water-splitting activity. We demonstrate that a simple, rapid microwave-sintering (RMS) route simultaneously incorporates...

Neuropeptide Y—Graphene Oxide Complexes Inhibit Amygdala NPY‐Receptor Expressing Glutamatergic Pathways and Selectively Remove Aversive Memory In Vivo

Therapeutic needs to modulate brain circuits highlight graphene-based materials (GBMs) as an emerging tool to engineer specific interventions to treat neuro-diseases. In this context, graphene oxide (GO) nanosheets offer new drug delivery strategies to reach neural cells and sign...