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Holey SA, Basak P, Bojja S, Nayak RR. The fabrication of bifunctional supramolecular glycolipid-based nanocomposite gel: insights into electrocatalytic performance with effective selectivity towards gold. SOFT MATTER 2023; 19:6305-6313. [PMID: 37555430 DOI: 10.1039/d3sm00921a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
Recovery, recycling, and reuse of metal waste have been re-intensified in the current era to build a sustainable future. In this context, gel nanocomposites were formulated by in situ reduction of gold within the low molecular weight gel matrix of synthetic glycolipid amphiphiles without using any external reducing/stabilizing agents. This strategy aroused the interest in formulating gel nanocomposites with preferential uptake of gold. The exclusive advantages owned by gold nanoparticle (GNP) embedded hydrogel offer an alternative to decorate the electrode surface without physical deposition/plating of the catalyst. Formation of GNP within the gel matrix was confirmed by the SPR peak in the UV-Visible spectrum. The particle size of 5-7 nm with zeta potential value in the range of -30.5 to -41.4 mV displayed good stability of nanoparticles in the gel matrix. Due to the encapsulation of nanoparticles within supramolecular assemblies of gel, a noteworthy increase in viscoelastic strength was observed, whereas the gelation behavior, melting temperature, and original fibrillar morphology of hydrogel remained intact. This hybrid gel exhibited good ionic conductivity (2.36 × 10-5 S cm-1) with appreciable ionic transport, remarkable oxygen reduction reaction (ORR) augmentation in reduction potential from 0 V to -0.12 V vs. Ag/AgCl as reference electrode, and excellent thermal stability in a wide temperature range. This green and efficient approach can pave the way for creating GNP-embedded hierarchical architecture that can act as bifunctional electrolyte/electrocatalyst material.
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Affiliation(s)
- Snehal Ashokrao Holey
- Department of Oils, Lipid Science and Technology, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Pratyay Basak
- Department of Polymers and Functional Materials, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Sreedhar Bojja
- Department of Analytical and Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Rati Ranjan Nayak
- Department of Oils, Lipid Science and Technology, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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Milikić J, Knežević S, Stojadinović S, Alsaiari M, Harraz FA, Santos DMF, Šljukić B. Facile Synthesis of Low-Cost Copper-Silver and Cobalt-Silver Alloy Nanoparticles on Reduced Graphene Oxide as Efficient Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media. NANOMATERIALS 2022; 12:nano12152657. [PMID: 35957088 PMCID: PMC9370632 DOI: 10.3390/nano12152657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 07/26/2022] [Accepted: 07/28/2022] [Indexed: 02/04/2023]
Abstract
Copper-silver and cobalt-silver alloy nanoparticles deposited on reduced graphene oxide (CuAg/rGO and CoAg/rGO) were synthesized and examined as electrocatalysts for oxygen reduction reaction (ORR) and hydrogen peroxide reduction reaction (HPRR) in alkaline media. Characterization of the prepared samples was done by transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD), and scanning electron microscopy with integrated energy-dispersive X-ray spectroscopy (SEM-EDS). CuAg/rGO and CoAg/rGO nanoparticles diameter ranged from 0.4 to 9.2 nm. The Ag loading was ca. 40 wt.% for both electrocatalysts, with that for Cu and Co being 35 and 17 wt.%, respectively. CoAg/rGO electrocatalyst showed a Tafel slope of 109 mV dec−1, significantly lower than that for CuAg/rGO (184 mV dec−1), suggesting faster ORR kinetics. Additionally, a higher diffusion current density was obtained for CoAg/rGO (−2.63 mA cm−2) than for CuAg/rGO (−1.74 mA cm−2). The average value of the number of electrons transferred during ORR was 2.8 for CuAg/rGO and 3.3 for CoAg/rGO electrocatalyst, further confirming the higher ORR activity of the latter. On the other hand, CuAg/rGO showed higher peak current densities (−3.96 mA cm−2) for HPRR compared to those recorded for CoAg/rGO electrocatalyst (−1.96 mA cm−2).
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Affiliation(s)
- Jadranka Milikić
- University of Belgrade, Faculty of Physical Chemistry, Studentski trg 12-16, 11158 Belgrade, Serbia;
- Correspondence: (J.M.); (D.M.F.S.)
| | - Sara Knežević
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia;
| | - Stevan Stojadinović
- University of Belgrade, Faculty of Physics, Studentski trg 12-16, 11000 Belgrade, Serbia;
| | - Mabkhoot Alsaiari
- Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, Najran 11001, Saudi Arabia; (M.A.); (F.A.H.)
- Department of Chemistry, Faculty of Science and Arts at Sharurah, Najran University, Najran 11001, Saudi Arabia
| | - Farid A. Harraz
- Promising Centre for Sensors and Electronic Devices (PCSED), Advanced Materials and Nano-Research Centre, Najran University, Najran 11001, Saudi Arabia; (M.A.); (F.A.H.)
- Nanomaterials and Nanotechnology Department, Central Metallurgical Research and Development Institute (CMRDI), Helwan 11421, Cairo, Egypt
| | - Diogo M. F. Santos
- Center of Physics and Engineering of Advanced Materials, Laboratory for Physics of Materials and Emerging Technologies, Chemical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal
- Correspondence: (J.M.); (D.M.F.S.)
| | - Biljana Šljukić
- University of Belgrade, Faculty of Physical Chemistry, Studentski trg 12-16, 11158 Belgrade, Serbia;
- Center of Physics and Engineering of Advanced Materials, Laboratory for Physics of Materials and Emerging Technologies, Chemical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal
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Cong Y, Wang H, Meng F, Dou D, Meng X, Zhao Q, Cao D, Wang Y. One-pot synthesis of NiPt core–shell nanoparticles toward efficient oxygen reduction reaction. J Solid State Electrochem 2022. [DOI: 10.1007/s10008-022-05175-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Lukyanov DA, Vereshchagin AA, Beletskii EV, Atangulov AB, Yankin AN, Sizov VV, Levin OV. Nickel Salicylideniminato 1D MOFs
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Electrochemical Polymerization. ChemElectroChem 2022. [DOI: 10.1002/celc.202101316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Daniil A. Lukyanov
- Saint Petersburg University 7/9 Universitetskaya nab. St. Petersburg 199034 Russian Federation
| | | | - Evgenii V. Beletskii
- Saint Petersburg University 7/9 Universitetskaya nab. St. Petersburg 199034 Russian Federation
| | - Arslan B. Atangulov
- Saint Petersburg University 7/9 Universitetskaya nab. St. Petersburg 199034 Russian Federation
| | - Andrei N. Yankin
- ITMO University Kronverksky Pr. 49, bldg. A St. Petersburg 197101 Russian Federation
| | - Vladimir V. Sizov
- Saint Petersburg University 7/9 Universitetskaya nab. St. Petersburg 199034 Russian Federation
| | - Oleg V. Levin
- Saint Petersburg University 7/9 Universitetskaya nab. St. Petersburg 199034 Russian Federation
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Abstract
Platinum and other metals are very scarce materials widely used in the energy and transportation sector among other sectors. Obtaining Platinum is becoming more difficult due to its scarcity on earth and because of the high amount of energy and water used for its extraction. In this regard, the recycling of platinum is necessary for sustainable technologies and for reaching a circular economy towards this expensive and rare metal. Conventional methods for platinum recycling make use of enormous amounts of energy for its recovery, which makes them not very attractive for industry implementation. Furthermore, these processes generate very toxic liquid streams and gas wastes that must be further treated, which do not meet the green environmental point of view of platinum recycling. Consequently, new advanced technologies are arising aiming to reach very high platinum recovery rates while being environmentally friendly and making a huge reduction of energy use compared with the conventional methods. In this review, conventional platinum recovery methods are summarized showing their limitations. Furthermore, new and promising approaches for platinum recovery are reviewed to shed light on about new and greener ways for a platinum circular economy.
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