@misc{10481/111312,
year = {2026},
month = {2},
url = {https://hdl.handle.net/10481/111312},
abstract = {Oxygen plasma offers a rapid, sustainable, and controllable method to tailor ZIF-67, however, the link between nanostructure, plasma-induced surface modifications, and electrocatalytic performance remains unclear. Here, canonical (Z) and non-canonical (nZ) ZIF-67 materials were engineered via O2 plasma and evaluated using the oxygen evolution reaction (OER) as a model. Plasma exposure times of 30, 45, and 60 min were explored. Three surface-confined transformations occurred in both variants: Co3O4 formation, partial oxidation of 2-methylimidazole linkers, and generation of undercoordinated Co2+ defect sites. Their extent and impact on porosity, crystallinity, and morphology strongly depended on the initial nanostructure and plasma duration, with clearer correlations for Z-derivatives. After 60 min-plasma treatment, Z-p60 and nZ-p60 reached ∼ 7.5 mA cm−2 at 1.76 V vs. RHE (LSV, without iR-compensation), corresponding to 3.1x and 3.5x higher OER current densities than Z and nZ, respectively. Improved kinetics were observed (Tafel slopes: Z-p60, 130 and 222 mV dec-1; nZ-p60, 133 and 204 mV dec-1), surpassing RuO2 (j1.76 = 4.8 mA cm−2; TS = 221 and 427 mV dec-1). Remarkably, controlled Co3O4 formation demonstrated that this oxide contributes significantly, although overall performance gains result from the interplay of all plasma-induced modifications.},
organization = {Consejería de Universidad, Investigación e Innovación, Junta de Andalucía - (EMEC_2023_00163)},
organization = {Ministerio de Ciencia e Innovación, Gobierno de España co-funded by FEDER (TED2021-129886B-C41)},
organization = {Fundação para a Ciência e a Tecnologia (FCT) - (DOI:10.54499/2021.00771.CEECIND/CP1662/CT0007)},
organization = {European Union - (ERC-2024-STG-101163654)},
organization = {Dr Catherine Dejoie - (ID-22)},
publisher = {Elsevier},
keywords = {MOF},
keywords = {ZIF-67},
keywords = {Cold plasma},
title = {Impact of initial structure on O2 plasma surface engineering and electrocatalytic behavior of ZIF-67},
doi = {10.1016/j.apsusc.2026.166395},
author = {Vismara, Rebecca and Bullejos Castro, Juan Carlos and Fernandes, Diana M. and Abdelkader Fernández, Víctor Karim},
}