Selenium tethered copper phthalocyanine hierarchical aggregates as electrochemical hydrogen evolution catalysts
| Autor: | Manivannan Mahendran, Karthik Krishnan, Selvakumar Karuthapandi, Indherjith Sakthinathan |
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| Rok vydání: | 2021 |
| Předmět: |
Selenoxide elimination
Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Toluene 0104 chemical sciences Catalysis chemistry.chemical_compound Fuel Technology Chemical engineering chemistry Covalent bond 0210 nano-technology Selenium Hydrogen production |
| Zdroj: | Sustainable Energy & Fuels. 5:3617-3631 |
| ISSN: | 2398-4902 |
| DOI: | 10.1039/d1se00595b |
| Popis: | The development of non-precious metal catalysts for the hydrogen evolution reaction (HER) with excellent stability and adequate performance characteristics in an acid environment is of fundamental importance for inexpensive hydrogen production from renewable resources. In this work, n-octylselanyl (n-OctSe) substituted copper phthalocyanine (CuPc) hierarchical aggregates were prepared and evaluated as an efficient catalyst for the electrochemical HER. Selenoxide elimination performed on (n-OctSe)8-CuPc with H2O2 under two different reaction conditions, one in MeOH/DCM medium at room temperature and another in toluene at 140 °C, led to the formation of nanostructured fibrous aggregates (FAs) and particulate aggregates (PAs), respectively. The structural and morphological characteristics of the prepared hierarchical aggregates have been systematically studied, thereby the coexistence of covalent and non-covalent linkage between CuPc skeletons is demonstrated by an adaptive structural ordering at the nanoscale regime. Owing to the unique structural order of hierarchical aggregates, the electrocatalytic HER overpotential (η) and interfacial charge transfer characteristics are greatly influenced. The nanostructured PAs exhibited much lower HER overpotential (−0.172 V) at a current density of 10 mA cm−2 as compared to the HER overpotential of the state-of-art materials that come under polymeric coordination complexes and pristine-metal organic frameworks (MOFs). Accompanied by high stability under acidic conditions, the high-performance catalytic behavior of PAs shows promise for the development of novel non-precious metal catalysts. |
| Databáze: | OpenAIRE |
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