2026-10-06T17:07:42Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33962377 2026-09-22T05:41:02Z category_856 portal_316 item_type_3 month_year_09_2026

Supplementary file 1_Phenolic hydroxyl-functionalized covalent organic frameworks for efficient hydrogen evolution in alkaline media.docx Sakshi Bharadwaj (25088047) Greesh Kumar (12060064) Tahir Naveed Jahangir (21015290) Raju Kumar Gupta (2132575) Takaya Ogawa (1740505) Manisha Das (8216160) Laurent Billon (1859287) Sabuj Kanti Das (4225978) Catalysis and Mechanisms of Reactions alkaline electrolysis covalent organic framework green energy heterogeneous electrocatalyst hydrogen evolution reaction <p>Developing economical and highly active metal-free electrocatalysts for the hydrogen evolution reaction (HER) is crucial for advancing sustainable hydrogen energy through water electrolysis. Although alkaline water electrolysis holds great potential as a scalable technology, the process is hindered by two major challenges: the sluggish water dissociation step and the limited intrinsic activity of metal-free catalysts. Here, we report TFPheMePh, a nitrogen-containing, hydroxyl-functionalized covalent organic framework (COF) synthesized via polycondensation, yielding a crystalline, porous material with a high BET surface area of 1309 m² g^-1. To maximise catalyst utilisation and facilitate efficient electron transport, the synthesized COF was drop-casted onto a three-dimensional dynamic hydrogen bubble template copper foam (DHBT-Cuf). Its interconnected porous architecture provides a highly conductive scaffold, enhanced electrolyte accessibility, and abundant exposed active sites, thereby facilitating water activation and HER. The resulting COF/DHBT-Cuf electrode delivers efficient HER activity in 1 M KOH, achieving an overpotential of 285 mV at 10 mA cm^-2 with a Tafel slope of 263 mV dec⁻¹. This performance arises from the synergy of nitrogen-rich active sites, phenolic groups, the electron-donating inductive effect of methyl substituents, a high-surface-area microporous channel network, and an extended π-conjugated backbone, collectively promoting charge transport, reactant accessibility, and catalytic kinetics. This work highlights the potential of the rational design of COFs integrated with three-dimensional conductive architectures as efficient metal-free electrocatalysts for alkaline HER and provides valuable insights into the development of advanced organic framework-based catalysts for sustainable green hydrogen production.</p> 2026-09-22T05:41:02Z Dataset Dataset 10.3389/fctls.2026.1929034.s001 https://figshare.com/articles/dataset/Supplementary_file_1_Phenolic_hydroxyl-functionalized_covalent_organic_frameworks_for_efficient_hydrogen_evolution_in_alkaline_media_docx/33962377 CC BY 4.0