LiH is a highly stable light metal hydride with a hydrogen capacity of 12.5 wt%. However, having a dehydrogenation enthalpy, ΔH(dehy), of 181.2 kJ mol(-1)(H2) and a resultant T(1 bar) of 944 °C, it is not a practical hydride for most hydrogen storage applications. In the work presented here, germanium has been found to dramatically reduce the dehydrogenation temperature for LiH down to just 270 °C. The enthalpy of dehydrogenation was reduced through the formation of lithium germanides. The reaction pathway was identified in this study using in situ powder neutron diffraction, showing the successive formation of more Li-rich germanides, following the series: LiGe, Li4Ge2H, Li9Ge4, and Li7Ge2. The enthalpy of formation for these germanides provides the thermodynamic tuning to reduce the ΔH(dehy) for the system. The 3LiH-Ge system investigated is found to be reversible with a maximum capacity of 3.0 ± 0.1 wt%.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c3cp51330k | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Catalytic acceptorless complete dehydrogenation of cycloalkanes.
Nat Commun
January 2025
Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
The advancement of an effective hydrogen liberation technology from liquid organic hydrogen carriers, particularly cycloalkanes such as cyclohexane and methylcyclohexane, holds significance in realizing a hydrogen-centric society. However, the attainment of homogeneous catalytic acceptorless dehydrogenation characterized by elevated selectivity for thorough aromatization under mild conditions remains unrealized. In this study, a catalyst system, facilitated by a double hydrogen atom transfer processes, has been devised for the catalytic acceptorless dehydrogenation of inert cycloalkanes at ambient temperature under visible light irradiation.
View Article and Find Full Text PDFCobalt catalysed cross-dehydrogenative coupling of indoles: a photoinduced ligand to metal charge transfer process.
Chem Commun (Camb)
January 2025
Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India.
We demonstrate the participation of cobalt in a photoinduced ligand-to-metal charge transfer process, which leads to the formation of ligand-based radical species and enables both homo and hetero cross-dehydrogenative coupling of indoles with decent yield at room temperature. This photo-induced LMCT process is substantiated by a series of mechanistic investigations.
View Article and Find Full Text PDFElectrospun Carbon Nanofibers Derived from Polyvinyl Alcohol Embedded with Bimetallic Nickle-Chromium Nanoparticles for Sodium Borohydride Dehydrogenation.
Polymers (Basel)
December 2024
Department of Mathematics and Physics Engineering, Faculty of Engineering, Mansoura University, El-Mansoura 35516, Egypt.
Bimetallic NiCr nanoparticles decorated on carbon nanofibers (NiCr@CNFs) were synthesized through electrospinning and investigated as catalysts for hydrogen generation from the dehydrogenation of sodium borohydride (SBH). Four distinct compositions were prepared, with chromium content in the catalysts ranging from 5 to 25 weight percentage (wt%). Comprehensive characterization confirmed the successful formation of bimetallic NiCr@CNFs.
View Article and Find Full Text PDFEngineering the Thermal and Energy-Storage Properties in Quantum Dots Using Dominant Faceting: The Case Study of Silicon.
ACS Nano
January 2025
Institute of Physics of the CAS, v.v.i., Cukrovarnická 10, 162 00 Prague 6, Czechia.
The storage and release of energy is an economic cornerstone. In quantum dots (QDs), energy storage is mostly governed by their surfaces, in particular by surface chemistry and faceting. The impact of surface free energy (SFE) through surface faceting has already been studied in QDs.
View Article and Find Full Text PDFO-Mediated Cu-Catalyzed Dehydrogenative Phenothiazination.
J Org Chem
January 2025
Institute of Organic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
In contrast to what one can be led to believe upon inspecting some of the recent literature, the dehydrogenative phenothiazination reaction does not require onerous technologies, complicated setups, or advanced catalysts in order to be mild and sustainable. We demonstrate this herein with a most facile, cost-effective, and sustainable Cu(II) catalyzed method, under 1 atm of O at room temperature in methanol, providing broad scope and high yields. These new results further set the dehydrogenative phenothiazination reaction among the green and practical coupling concepts of chemistry.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!