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Saha S, Diyali N, Diyali S, Panda SJ, Das M, Acharya S, Mudi PK, Singh M, Ray PP, Purohit CS, Biswas B. Decrypting the hydrogen evolution in alkaline water with novel magnetoactive cobalt(II) complex-driven cobalt oxide electrocatalysts. Dalton Trans 2024; 53:13805-13814. [PMID: 39109402 DOI: 10.1039/d4dt01358a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/21/2024]
Abstract
Under the gravity of future socio-economic development, the viability of water electrolysis still hinges on the accessibility of stable earth-abundant electrocatalysts and net energy efficiency. This work emphasizes the design and synthesis of two newly developed cobalt(II) complexes, [Co(HL)2(NCS)2] (Comono) and [Co2(L)3(CH3OH)]ClO4 (Codi), with a (N,O)-donor ligand, HL (2-methoxy-6-(((2-methoxyphenyl)imino)methyl)phenol). The study delves into understanding their structural, morphological, magnetic, and charge transport characteristics. Moreover, the study explores the potential of these complexes in catalyzing hydrogen production through heterogeneous electrocatalysis. The X-ray crystal structure of Comono reveals the octahedral geometry of the Co(II) ion, adopting two HL units and two NCS- units. The Codi complex exhibits a doubly-phenoxo-O-bridged (μ1,1) dinuclear complex, forming a typical octahedral geometry for both the Co(II) centres in coupling with three units of L-. Temperature-dependent magnetic susceptibility measurements showed that all of the Co(II) ion in Comono shows a typical paramagnetic behaviour for high spin octahedral Co(II) ions while the Co(II) centres in Codi are coupled with doubly-phenoxo-bridges bearing weak ferromagnetic characteristics at low temperature. Electron transport properties of the Co(II) complex-mediated Schottky device address the superior carrier mobility (μ) for Codi (9.21 × 10-5) over Comono (2.02 × 10-5 m2 v-1 s-1) with respective transit times of 1.70 × 10-9 and 7.77 × 10-9 s. Additionally, electron impedance spectral analysis supports the lower electrical transport resistance of Codi relative to Comono. The heterogeneous electrocatalytic HER activity of Codi and Comono in 0.1 M KOH shows excellent electrocatalytic efficiency in terms of the various electrochemical parameters. Constant potential electrolysis, multi-cycle CVs, and post-HER analysis reveal the pre-catalytic nature of the complexes, which in turn delivers Co3O4 nanoparticles as the active catalysts for efficient hydrogen evolution.
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Affiliation(s)
- Subhajit Saha
- Department of Chemistry, University of North Bengal, Darjeeling-734013, India.
| | - Nilankar Diyali
- Department of Chemistry, University of North Bengal, Darjeeling-734013, India.
| | - Sangharaj Diyali
- Department of Chemistry, University of North Bengal, Darjeeling-734013, India.
| | - Subhra Jyoti Panda
- Department of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar 752050, India
| | - Mainak Das
- Department of Physics, Jadavpur University, Kolkata-700032, India
| | - Sobhna Acharya
- Energy and Environment Unit, Institute of Nano Science and Technology, Mohali 140306, India
| | | | - Monika Singh
- Energy and Environment Unit, Institute of Nano Science and Technology, Mohali 140306, India
| | | | - Chandra Shekhar Purohit
- Department of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar 752050, India
| | - Bhaskar Biswas
- Department of Chemistry, University of North Bengal, Darjeeling-734013, India.
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Saha S, De A, Banerjee S, Das AK, Ohlin CA, Mondal R. Exploring the Water Oxidation Catalytic Activity of a Mn-Based Magnetic Metal-Organic Framework: The Role of Proton Conductivity and Oxygen Evolution Reaction Overpotential. Inorg Chem 2024; 63:10619-10633. [PMID: 38805642 DOI: 10.1021/acs.inorgchem.4c01078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
The present work evaluates the water oxidation catalytic activity of a Mn-based metal-organic framework (MOF), which we envisioned to reduce the oxygen evolution reaction (OER) overpotential because of its high electrical conductivity, facilitated by solvent-encapsulated structural features. The presence of Mn centers induces interesting magnetic features in the MOF, which exhibits impressive cryogenic magnetic refrigeration with a ΔSM value of 29.94 J kg-1 K-1 for a field change of ΔH = 5T at 2.3 K. To the best of our knowledge, the ΔSM value of the current system ranked the highest position among the published examples. The crystal structure aligns perfectly with the thematic expectations and features as many as ten metal-coordinated water molecules, forming an extensive web of a hydrogen-bonded network while facing toward the porous channel filled with another set of much-anticipated entrapped lattice water molecules. Such structural features are expected to manifest high proton conductivity, and detailed investigation indeed yields the best value for the system at 1.57 × 10-4 S/cm at 95% humidity and 85 °C. In order to evaluate the thematic notion of a one-to-one relationship between OER and improved electrical conductivity, extensive electrocatalytic water splitting (WS) investigations were carried out. The final results show highly encouraging WS ability of the Mn-MOF, showing the electrocatalytic surface area value of the active species as 0.0686 F/g with a turnover frequency value of 0.043 [(mol. O2) (mol. Mn-MOF)-1 s-1]. Another fascinating aspect of the current communication is the excellent synergy observed between the experimental WS outcomes and the corresponding theoretical data calculated using density functional theory (DFT). Consequently, a plausible mechanism of the overall OER and the role of the Mn-MOF as a water oxidation catalyst, along with the importance of water molecules, have also been derived from the theoretical calculations using DFT.
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Affiliation(s)
- Sayan Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - Avik De
- Department of Chemistry, Faculty of Science and Technology, Umeå University, Umeå 907 36, Sweden
| | - Soumadip Banerjee
- School of Mathematical & Computational Sciences, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - Abhijit Kumar Das
- School of Mathematical & Computational Sciences, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - C André Ohlin
- Department of Chemistry, Faculty of Science and Technology, Umeå University, Umeå 907 36, Sweden
| | - Raju Mondal
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700 032, India
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Gupta R, Fereiro JA, Bayat A, Pritam A, Zharnikov M, Mondal PC. Nanoscale molecular rectifiers. Nat Rev Chem 2023; 7:106-122. [PMID: 37117915 DOI: 10.1038/s41570-022-00457-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/30/2022] [Indexed: 01/15/2023]
Abstract
The use of molecules bridged between two electrodes as a stable rectifier is an important goal in molecular electronics. Until recently, however, and despite extensive experimental and theoretical work, many aspects of our fundamental understanding and practical challenges have remained unresolved and prevented the realization of such devices. Recent advances in custom-designed molecular systems with rectification ratios exceeding 105 have now made these systems potentially competitive with existing silicon-based devices. Here, we provide an overview and critical analysis of recent progress in molecular rectification within single molecules, self-assembled monolayers, molecular multilayers, heterostructures, and metal-organic frameworks and coordination polymers. Examples of conceptually important and best-performing systems are discussed, alongside their rectification mechanisms. We present an outlook for the field, as well as prospects for the commercialization of molecular rectifiers.
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Saha S, Pal B, Sundar Das K, Kumar Ghose P, Ghosh A, De A, Kumar Das A, Pratim Ray P, Mondal R. Design of Dual Purpose Fe‐metallogel for Magnetic Refrigeration and Fabrication of Schottky Barrier Diode. ChemistrySelect 2022. [DOI: 10.1002/slct.202203307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sayan Saha
- School of Chemical Science Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road Kolkata 700032 West Bengal India
| | - Baisakhi Pal
- Department of Physics Jadavpur University Jadavpur Kolkata 700 032 India
| | - Krishna Sundar Das
- School of Chemical Science Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road Kolkata 700032 West Bengal India
| | - Pradeepta Kumar Ghose
- School of Physical Science Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road Kolkata 700032 West Bengal India
| | - Avik Ghosh
- School of Mathematical & Computational Sciences Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road Kolkata 700032 West Bengal India
| | - Avik De
- School of Chemical Science Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road Kolkata 700032 West Bengal India
| | - Abhijit Kumar Das
- School of Mathematical & Computational Sciences Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road Kolkata 700032 West Bengal India
| | - Partha Pratim Ray
- Department of Physics Jadavpur University Jadavpur Kolkata 700 032 India
| | - Raju Mondal
- School of Chemical Science Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road Kolkata 700032 West Bengal India
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