Complementary behaviour of EDL and HER activity in functionalized graphene nanoplatelets
| العنوان: | Complementary behaviour of EDL and HER activity in functionalized graphene nanoplatelets |
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| المؤلفون: | Nithya Chakingal, Pulickel M. Ajayan, Anand B. Puthirath, Sreehari K. Saju, Minfei Fei, Robert Vajtai, Ranjith Prasannachandran, Keiko Kato, Sharmila N. Shirodkar, Abhijit Baburaj, Boris I. Yakobson |
| المصدر: | Nanoscale. 12:1790-1800 |
| بيانات النشر: | Royal Society of Chemistry (RSC), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Materials science, Chemical engineering, Electrolysis of water, Hydrogen fuel, Electrode, engineering, Water splitting, Surface modification, General Materials Science, Noble metal, engineering.material, Catalysis, Hydrogen production |
| الوصف: | Green hydrogen production is a vital requirement of the upcoming hydrogen fuel-based locomotion and economy. Water electrolysis facilitated by electricity derived from renewable sources and direct solar-to-hydrogen conversion centred on photochemical and photoelectrochemical water splitting is a promising pathway for sustainable hydrogen production. All these methods require a highly active noble metal catalyst to make the water-splitting process more energy-efficient and in order to make it economical, metal-free hydrogen evolution catalysts such as graphene nanoplatelets (GNPs) are essential. Herein, we report the effect of a range of functionalizations on the catalytic properties of graphene nanoplatelets (GNPs) for the hydrogen evolution reaction (HER). We also account for the effect of functionalization on the strength of the electrical double layer formation on the surface of functionalized GNPs. It is observed that the catalytic activity and the electrical double layer strength are inversely related to each other. Our first-principles-based density functional theoretical (DFT) modelling unravels the origin of the observed electrocatalytic activity and its trend and the strength of the electrical double layers in terms of free energy changes during the ion absorption/desorption events on the electrode surface. Based on our observations, minimizing the electrical double layer strength is identified as an approach to improve the catalytic performance of the catalysts. |
| تدمد: | 2040-3372 2040-3364 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1bb1d32f3e13f803c29059892dad6373 https://doi.org/10.1039/c9nr08102j |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi.dedup.....1bb1d32f3e13f803c29059892dad6373 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20403372 20403364 |
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