Alkali metal pyridinolate/piperidinolate pairs: a new type of materials for efficient hydrogen storage

Published

December 11, 2024

Author(s)

Alexis Munyentwali, Yang Yu, Xingchi Zhou, Wei Zhou, Qijun Pei, Khai Chen Tan, Anan Wu, Hui Wu, Teng He, Ping Chen

Abstract

Chemical hydrogen storage in organic materials is a promising method thanks to its high storage density, reversibility, and safety. However, their dehydrogenation requires high temperatures due to their unfavorable thermodynamic properties. This work creatively designs a new type of materials for efficient hydrogen storage, i.e., alkali metal pyridinolate/piperidinolate systems, by combining the effects of "heteroatom" and "metal substitution" in one molecule. These air-stable compounds can be synthesized using low-cost reactants in a green solvent (H2O). Thermodynamic predictions indicate that the dehydrogenation enthalpies can be significantly reduced, exemplified by lithium 2-piperidinolate with a 5.6 wt% hydrogen content and a suitable ΔHd of 32.2 kJ/mol-H2. Experimental results using sodium systems validate the computational predictions, demonstrating reversible hydrogen storage even below 100 °C. This study reports new low-cost hydrogen storage materials and provides a rational design strategy for developing metalorganic compounds possessing high hydrogen capacities and ideal thermodynamics.

Citation

Angewandte Chemie-International Edition

Pub Type

Journals

Keywords

Hydrogen storage, alkali metal pyridinolates, ring nitrogen, metal substitution.

Citation

Munyentwali, A. , Yu, Y. , Zhou, X. , Zhou, W. , Pei, Q. , Chen Tan, K. , Wu, A. , Wu, H. , He, T. and Chen, P. (2024), Alkali metal pyridinolate/piperidinolate pairs: a new type of materials for efficient hydrogen storage, Angewandte Chemie-International Edition (Accessed April 4, 2025)