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[Ru(tmphen)(3)](2)[Fe(CN)(6)] and [Ru(phen)(3)][Fe(CN)(5)(NO)] complexes and formation of a heterostructured RuO2-Fe2O3 nanocomposite as an efficient alkaline HER and OER electrocatalyst


Mosallaei, Hamta; Hadadzadeh, Hassan; Foelske, Annette; Sauer, Markus; Amiri Rudbari, Hadi; Blacque, Olivier (2022). [Ru(tmphen)(3)](2)[Fe(CN)(6)] and [Ru(phen)(3)][Fe(CN)(5)(NO)] complexes and formation of a heterostructured RuO2-Fe2O3 nanocomposite as an efficient alkaline HER and OER electrocatalyst. Dalton Transactions, 51(16):6314-6331.

Abstract

Water electrolysis is one of the most capable processes for supplying clean fuel. Herein, two novel ionic Ru(ii)-Fe(ii) complexes, [Ru(tmphen)(3)](2)[Fe(CN)(6)] and [Ru(phen)(3)][Fe(CN)(5)(NO)], where tmphen = 3,4,7,8-tetramethyl-1,10-phenanthroline and phen = 1,10-phenanthroline, were synthesized and characterized by UV-Vis spectroscopy, elemental analysis, FT-IR, and single-crystal X-ray structural analysis. By thermally decomposing the [Ru(tmphen)(3)](2)[Fe(CN)(6)] complex at 600 degrees C for 4 h, a heterostructured RuO2-Fe2O3 nanocomposite was fabricated through a facile one-pot treatment and then characterized by FT-IR, XRD, FT-Raman, UV-Vis (DRS), ICP-OES, FE-SEM, TEM, TGA/DTG, BET, and XPS analyses, which revealed the formation of highly crystalline RuO2-Fe2O3 nanoparticles with an average size of 8-12 nm. The prepared nanocomposite was an efficient heterostructured electrocatalyst for performing water-splitting redox reaction processes, including hydrogen and oxygen evolution reactions (HER and OER) in alkaline solutions. In this regard, RuO2 and Fe2O3 samples were also prepared through thermal decomposition of [Ru(tmphen)(3)](NO3)(2) and K-4[Fe(CN)(6)] precursors, respectively, as control experiments to compare their HER and OER electrocatalytic activity with that of the RuO2-Fe2O3 nanocomposite. Specifically, the RuO2-Fe2O3 nanocomposite exhibited significant electrocatalytic performance, generating 10 mA cm(-2) current density at -148 and 292 mV overpotentials, and the Tafel slope results from fitting the LSV curves to the Tafel equation were -43 and 56.08 mV dec(-1) for the HER and OER, respectively. Therefore, the heterostructured RuO2-Fe2O3 nanocomposite can be viewed as a bi-functional electrocatalyst for HER and OER because it exploits the synergistic effects of heterostructures and active sites at its interface.

Abstract

Water electrolysis is one of the most capable processes for supplying clean fuel. Herein, two novel ionic Ru(ii)-Fe(ii) complexes, [Ru(tmphen)(3)](2)[Fe(CN)(6)] and [Ru(phen)(3)][Fe(CN)(5)(NO)], where tmphen = 3,4,7,8-tetramethyl-1,10-phenanthroline and phen = 1,10-phenanthroline, were synthesized and characterized by UV-Vis spectroscopy, elemental analysis, FT-IR, and single-crystal X-ray structural analysis. By thermally decomposing the [Ru(tmphen)(3)](2)[Fe(CN)(6)] complex at 600 degrees C for 4 h, a heterostructured RuO2-Fe2O3 nanocomposite was fabricated through a facile one-pot treatment and then characterized by FT-IR, XRD, FT-Raman, UV-Vis (DRS), ICP-OES, FE-SEM, TEM, TGA/DTG, BET, and XPS analyses, which revealed the formation of highly crystalline RuO2-Fe2O3 nanoparticles with an average size of 8-12 nm. The prepared nanocomposite was an efficient heterostructured electrocatalyst for performing water-splitting redox reaction processes, including hydrogen and oxygen evolution reactions (HER and OER) in alkaline solutions. In this regard, RuO2 and Fe2O3 samples were also prepared through thermal decomposition of [Ru(tmphen)(3)](NO3)(2) and K-4[Fe(CN)(6)] precursors, respectively, as control experiments to compare their HER and OER electrocatalytic activity with that of the RuO2-Fe2O3 nanocomposite. Specifically, the RuO2-Fe2O3 nanocomposite exhibited significant electrocatalytic performance, generating 10 mA cm(-2) current density at -148 and 292 mV overpotentials, and the Tafel slope results from fitting the LSV curves to the Tafel equation were -43 and 56.08 mV dec(-1) for the HER and OER, respectively. Therefore, the heterostructured RuO2-Fe2O3 nanocomposite can be viewed as a bi-functional electrocatalyst for HER and OER because it exploits the synergistic effects of heterostructures and active sites at its interface.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > Inorganic Chemistry
Uncontrolled Keywords:Inorganic Chemistry
Language:English
Date:1 January 2022
Deposited On:09 Jan 2023 18:00
Last Modified:27 Feb 2024 02:48
Publisher:Royal Society of Chemistry
ISSN:1477-9226
OA Status:Green
Publisher DOI:https://doi.org/10.1039/d2dt00398h
Project Information:
  • : FunderIsfahan University of Technology
  • : Grant ID
  • : Project Title