Electrochemical Cycling of Liquid Organic Hydrogen Carriers as a Sustainable Approach for Hydrogen Storage and Transportation

ACS Sustainable Chemistry & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

Hydrogen (H2), as a high-energy-density molecule, offers clean solution to carry energy. However, the high diffusivity and low volumetric density of H2 pose challenge for long-term storage transportation. Liquid organic hydrogen carriers (LOHCs) have been suggested strategic way store transport in stable molecules. More so, electrochemical LOHC cycling renders an opportunity utilize renewable energy transportation toward goal eliminating carbon emissions. In this Perspective, examples reactions molecules their suitability couples are examined. A comparative footprint assessment processes against thermochemical hybrid was performed. The process had lowest relative only when highly concentrated LOHCs were used feed or purification product not required. diluted primarily contributed by distillation separation process. sensitivity analysis showed concentration dependence during Moreover, electrolyte composition significantly affects cycling. Energy utilization, water usage, toxicity discussed provide overview better economic environmental practices. There significant opportunities if appropriate conditions such concentrations reactant, reversible redox ability, Faradaic efficiencies, catalyst stabilities achieved.

Language: Английский

Electrooxidation of 2‐Propanol on Mono‐ and Bi‐Metallic Noble Metal Nanoparticles in Alkaline Studied with Real‐Time Product and Dissolution Characterization

ChemElectroChem, Journal Year: 2025, Volume and Issue: unknown

Published: March 18, 2025

Abstract The selective electrochemical oxidation of 2‐propanol to acetone can be used in fuel cells deliver low‐carbon electricity and efficiently utilize hydrogen that is stored liquid organic carrier molecules. Here we study the electrooxidation alkaline electrolyte, on various commercially available carbon‐supported mono‐ bi‐metallic noble metal nanoparticles. We use voltammetry compare activity different catalysts, combine a flow cell with real‐time analytics monitor products reaction dissolution atoms presence absence 2‐propanol. While if formed all our results show onset potential lowest for PtRu/C, Rh/C PdRh/C, but current latter reaches much higher value before surface passivated, suggesting PdRh/C would preferred an fed Online monitoring suggests anode should not exposed potentials above ca. +0.8 V during transient operation, i. e., startup/shutdown conditions, prevent palladium rhodium from catalyst surface.

Language: Английский

The Electrochemical Acetone/Isopropanol Hydrogenation Cycle – An Alternative to Current Hydrogen Storage Solutions

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 20, 2024

Abstract Liquid organic hydrogen carrier (LOHC) systems offer a promising way to store using the existing infrastructure for liquid fuels. While LOHC hydrogenation and dehydrogenation processes have so far mainly been investigated thermocatalytic processes, this work explores concept of low‐temperature (<80 °C) electrochemical acetone/isopropanol cycle indicates its potential benefits future economy. This (EC‐LOHC) system builds on low‐cost chemicals with low ecotoxicology. In study, influence temperature fuel concentrations polarization curves units in small, single‐cell set‐up is proton exchange membrane cell components. Based experimental results, efficiencies are determined power‐to‐power that can be competitive mature storage technologies, such as compressed storage. Finally, material‐related challenges discussed, encouraging research new field

Language: Английский