Hydrogen has been chosen as an environmentally benign energy source to replace fossil-fuel-based energy systems. Since hydrogen is difficult to store and transport in its gaseous phase, thermochemical liquid organic hydrogen carriers (LOHCs) have been developed as one of the alternative technologies. However, the high temperature and pressure requirements of thermochemical LOHC systems result in huge energy waste and impracticality. This Perspective proposes electrochemical (EC)-LOHCs capable of more efficient, safer, and lower temperature and pressure hydrogen storage/utilization. To enable this technology, several EC-LOHC candidates such as isopropanol, phenolic compounds, and organic acids are described, and the latest research trends and design concepts of related homo/hetero-based electrocatalysts are discussed. In addition, we propose efficient fuel-cell-based systems that implement electrochemical (de)hydrogenation of EC-LOHCs and present prospects for relevant technologies.
Bibliographical noteFunding Information:
This work is dedicated to the 70th anniversary of the department of chemistry in Sungkyunkwan University. This work was financially supported by the National Research Foundation of Korea (NRF- 2021R1A2C4001411, 2022K2A9A2A06018606 2019R1A6A1A11044070, 2020R1A2B5B03002475, 2021R1A5A1028138).
© 2023 American Chemical Society.
ASJC Scopus subject areas
- General Chemistry
- Colloid and Surface Chemistry