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Mallick L, Samanta K, Chakraborty B. Post-synthetic Metalation on the Ionic TiO 2 Surface to Enhance Metal-CO 2 Interaction During Photochemical CO 2 Reduction. Chemistry 2024; 30:e202400428. [PMID: 38715434 DOI: 10.1002/chem.202400428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Indexed: 06/21/2024]
Abstract
During the photochemical CO2 reduction reaction, CO2 adsorption on the catalyst's surface is a crucial step where the binding mode of the [metal-CO2] adduct directs the product selectivity and efficiency. Herein, an ionic TiO2 nanostructure stabilized by polyoxometalates (POM), ([POM]x@TiO2), is prepared and the sodium counter ions present on the surface to balance the POMs' charge are replaced with copper(II) ions, (Cux[POM]@TiO2). The microscopic and spectroscopic studies affirm the copper exchange without altering the TiO2 core and weak coordination of copper (II) ions to the POMs' surface. Band structure analysis suggests the photo-harvesting efficiency of the TiO2 core with the conduction band edge higher than the reduction potential of CuII/I and multi-electron CO2 reduction potentials. Photochemical CO2 reduction with Cux[POM]@TiO2 results in 30 μmol gcat. -1 CO (79 %) and 8 μmol gcat -1 of CH4 (21 %). Quasi-in-situ Raman study provides evidence in support of CO2 adsorption on the Cux[POM]@TiO2 surface. 13C and D2O labeling studies affirm the {Cu-[CO2]-} adduct formation. Despite the photo-harvesting ability of Nax[POM]@TiO2 itself, the poor CO2 adsorption ability of sodium ions highlights the crucial role of copper ion CO2 photo-reduction. Characterization of the {M-[η2-CO2]-} species via surface tuning validates the CO2 activation and photochemical reduction pathway proposed earlier.
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Affiliation(s)
- Laxmikanta Mallick
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India
| | - Krishna Samanta
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India
| | - Biswarup Chakraborty
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India
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2
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Kundu A, Dhillon AK, Singh R, Barman S, Siddhanta S, Chakraborty B. Evolution of Mn-Bi 2O 3 from the Mn-doped Bi 3O 4Br electro(pre)catalyst during the oxygen evolution reaction. Dalton Trans 2024; 53:8020-8032. [PMID: 38651992 DOI: 10.1039/d4dt00633j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Mn-doped Bi3O4Br has been synthesized using a solvothermal route. The undoped Bi3O4Br and Mn-Bi3O4Br materials possess orthorhombic unit cells with two distinct Bi sites forming a layered atomic arrangement. The shift in the (020) plane in the powder X-ray diffraction (PXRD) pattern confirms Mn-doping in the Bi3O4Br lattice. Elemental mapping indicated 7% Mn doping in the Bi3O4Br lattice structure. A core-level X-ray photoelectron study (XPS) indicates the presence of BiIII and MnII valence-states in Mn-Bi3O4Br. Doping with a cation (MnII) containing a different charge and ionic radius resulted in vacancy/defects in Mn-Bi3O4Br which further altered its electronic structure by reducing the indirect band gap, beneficial for electron conduction and electrocatalysis. The irreversible MnII to MnIII transformation at a potential of 1.48 V (vs. RHE) precedes the electrochemical oxygen evolution reaction (OER). The Mn-doped electrocatalyst achieved 10 mA cm-2 current density at 337 mV overpotential, while the pristine Bi3O4Br required 385 mV overpotential to reach the same activity. The pronounced OER activity of the Mn-Bi3O4Br sample over the pristine Bi3O4Br highlights the necessity of MnII doping. The superior activity of the Mn-Bi3O4Br catalyst over that of Bi3O4Br is due to a low Tafel slope, better double-layer capacitance (Cdl), and small charge-transfer resistance (Rct). The chronoamperometry (CA) study depicts long-term stability for 12 h at 20 mA cm-2. An electrolyzer fabricated as Pt(-)/(+)Mn-Bi3O4Br can deliver 10 mA cm-2 at a cell potential of 2.05 V. The post-CA-OER analyses of the anode confirmed the leaching of [Br-] followed by in situ formation of Mn-doped Bi2O3 as the electrocatalytically active species. Herein, an ultra-low Mn-doping into Bi3O4Br leads to an improvement in the electrocatalytic performance of the inactive Bi3O4Br material.
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Affiliation(s)
- Avinava Kundu
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India.
| | - Ashish Kumar Dhillon
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India.
| | - Ruchi Singh
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India.
| | - Sanmitra Barman
- Center for Advanced Materials and Devices (CAMD), BML Munjal University, Haryana, India.
| | - Soumik Siddhanta
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India.
| | - Biswarup Chakraborty
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India.
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3
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Patil R, Rajput A, Matsagar BM, Chen NCR, Ujihara M, Salunkhe RR, Yadav P, Wu KCW, Chakraborty B, Dutta S. Elevated temperature-driven coordinative reconstruction of an unsaturated single-Ni-atom structure with low valency on a polymer-derived matrix for the electrolytic oxygen evolution reaction. NANOSCALE 2024; 16:7467-7479. [PMID: 38511345 DOI: 10.1039/d4nr00337c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
A high-temperature pyrolysis-controlled coordination reconstruction resulted in a single-Ni-atom structure with a Ni-Nx-C structural unit (x = N atom coordinated to Ni). Pyrolysis of Ni-phen@ZIF-8-RF at 700 °C resulted in NiNP-NC-700 with predominantly Ni nanoparticles. Upon elevating the pyrolysis temperature from 700 to 900 °C, a coordination reconstruction offers Ni-Nx atomic sites in NiSA-NC-900. A combined investigation with X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, and soft X-ray L3-edge spectroscopy suggests the stabilization of low-valent Niδ+ (0 < δ < 2) in the Ni-N-C structural units. The oxygen evolution reaction (OER) is a key process during water splitting in fuel cells. However, OER is a thermodynamically uphill reaction with multi-step proton-coupled electron transfer and sluggish kinetics, due to which there is a need for a catalyst that can lower the OER overpotentials. The adsorption energy of a multi-step reaction on a single metal atom with coordination unsaturation tunes the adsorption of each oxygenated intermediate. The promising OER activity of the NiSA-NC-900/NF anode on nickel foam was followed by the overall water splitting (OWS) using using NiSA-NC-900/NF as anode and Pt coil as the cathodic counterpart, wherein a cell potential of 1.75 V at 10 mA cm-2 was achieved. The cell potential recorded with Pt(-)/(+)NiSA-NC-900/NF was much lower than that obtained for other cells, i.e., Pt(-)/NF and NF(-)/(+)NF, which enhances the potentials of low-valent NiSAs for insightful understanding of the OER. At a constant applied potential of 1.61 V (vs. RHE) for 12 h, an small increase in current for initial 0.6 h followed by a constant current depicts the fair stability of catalyst for 12 h. Our results offer an insightful angle into the OER with a coordinatively reconstructed single-Ni-atom structure at lower valency (<+2).
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Affiliation(s)
- Rahul Patil
- Electrochemical Energy & Sensor Research Laboratory, Amity Institute of Click Chemistry Research & Studies, Amity University, Noida, India.
| | - Anubha Rajput
- Department of Chemistry, Indian Institute of Technology, New Delhi, India.
| | - Babasaheb M Matsagar
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Norman C R Chen
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Molecular Science and Technology Program, Taiwan International Graduate Program Academia Sinica, Taiwan
- International Graduate Program of Molecular Science and Technology (NTU-MST), National Taiwan University, Taiwan
| | - Masaki Ujihara
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei, Taiwan
| | - Rahul R Salunkhe
- Materials Research Laboratory Department of Physics, Indian Institute of Technology, Jammu, India
| | - Praveen Yadav
- Synchrotron X-ray Facility, Raja Ramanna Centre for Advanced Technology, Rajendra Nagar, Indore, Madhya Pradesh 452013, India
| | - Kevin C-W Wu
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | | | - Saikat Dutta
- Electrochemical Energy & Sensor Research Laboratory, Amity Institute of Click Chemistry Research & Studies, Amity University, Noida, India.
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Kundu A, Chakraborty B. Surface Structure to Tailor the Electrochemical Behavior of Mixed-Valence Copper Sulfides during Water Electrolysis. JACS AU 2024; 4:642-656. [PMID: 38425911 PMCID: PMC10900219 DOI: 10.1021/jacsau.3c00703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/23/2023] [Accepted: 12/28/2023] [Indexed: 03/02/2024]
Abstract
The semiconducting behavior of mixed-valence copper sulfides arises from the pronounced covalency of Cu-S bonds and the exchange coupling between CuI and CuII centers. Although electrocatalytic study with digenite Cu9S5 and covellite CuS has been performed earlier, detailed redox chemistry and its interpretation through lattice structure analysis have never been realized. Herein, nanostructured Cu9S5 and CuS are prepared and used as electrode materials to study their electrochemistry. Powder X-ray diffraction (PXRD) and microscopic studies have found the exposed surface of Cu9S5 to be d(0015) and d(002) for CuS. Tetrahedral (Td) CuII, distorted octahedral (Oh) CuII, and trigonal planar (Tp) CuI sites form the d(0015) surface of Cu9S5, while the (002) surface of CuS consists of only Td CuII. The distribution of CuI and CuII sites in the lattice, predicted by PXRD, can further be validated through core-level Cu 2p X-ray photoelectron spectroscopy (XPS). The difference in the electrochemical response of Cu9S5 and CuS arises predominantly from the different copper sites present in the exposed surfaces and their redox states. In situ Raman spectra recorded during cyclic voltammetric study indicates that Cu9S5 is more electrochemically labile compared to CuS and transforms rapidly to CuO/Cu2O. Contact-angle and BET analyses imply that a high-surface-energy and macroporous Cu9S5 surface favors the electrolyte diffusion, which leads to a pronounced redox response. Post-chronoamperometric (CA) characterizations identify the potential-dependent structural transformation of Cu9S5 and CuS to CuO/Cu2O/Cu(OH)2 electroactive species. The performance of the in situ formed copper-oxides towards electrocatalytic water-splitting is superior compared to the pristine copper sulfides. In this study, the redox chemistry of the Cu9S5/CuS has been correlated to the atomic arrangements and coordination geometry of the surface exposed sites. The structure-activity correlation provides in-depth knowledge of how to interpret the electrochemistry of metal sulfides and their in situ potential-driven surface/bulk transformation pathway to evolve the active phase.
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Affiliation(s)
- Avinava Kundu
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Biswarup Chakraborty
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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Zhang R, Chen N, Ning T, Zhang Y, Ling Y, Wang X, Zhu W, Zhu G. Branched Porous Ni 3N as a Catalytic Electrode for Selective Semidehydrogenation of Tetrahydroisoquinoline. Inorg Chem 2023; 62:17433-17443. [PMID: 37817640 DOI: 10.1021/acs.inorgchem.3c02809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/12/2023]
Abstract
Oxygen evolution in electrochemical water splitting needs a high overpotential that significantly reduces the energy efficiency. To explore an alternative anodic reaction to promote the production of hydrogen at the other end of water splitting and at the same time to get high-value-added chemicals is highly desirable. Herein, we demonstrate a novel branched porous Ni3N catalyst that is prepared for dehydrogenation of tetrahydroisoquinoline, which acts as an anodic oxidation reaction to promote H2 formation on the other end. Interestingly, the Ni3N catalytic electrode can induce effective semidehydrogenation with the selective formation of dihydroisoquinoline, which is difficult to be obtained by the usual direct synthesis route. The catalytic electrode exhibits a low potential of 1.55 V (vs RHE) for a catalytic current density of 61 mA cm-2 with dehydrogenation of tetrahydroisoquinoline and hydrogen production. In situ Raman spectra studies suggest that NiOOH is formed on the electrode surface, which mediates the oxidation semidehydrogenation process. This work also provides a strategy to fabricate nitride materials for applications beyond selective semidehydrogenation of tetrahydroisoquinoline.
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Affiliation(s)
- Rongxian Zhang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
| | - Nan Chen
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
| | - Tianya Ning
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
| | - Yizhou Zhang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
| | - Yizhou Ling
- School of Educational Sciences, Nanjing Normal University, Nanjing 210097, China
| | - Xi Wang
- School of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230601, China
| | - Wenjuan Zhu
- School of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230601, China
| | - Guoxing Zhu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
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6
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Zhu J, Zi S, Zhang N, Hu Y, An L, Xi P. Surface Reconstruction of Covellite CuS Nanocrystals for Enhanced OER Catalytic Performance in Alkaline Solution. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2301762. [PMID: 37150854 DOI: 10.1002/smll.202301762] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/05/2023] [Indexed: 05/09/2023]
Abstract
Oxygen evolution reaction (OER) is one of the important half-reactions in energy conversion equipment such as water-spitting devices, rechargeable metal-air batteries, and so on. It is beneficial to develop efficient and low-cost catalysts that understand the reaction mechanism of OER and analyze the reconstruction phenomenon of transition metal sulfide. Interestingly, copper sulfide and cuprous sulfide with the same components possess different reconstruction behaviors due to their different metal ion valence states and different atomic arrangement modes. Because of a unique atomic arrangement sequence and certain cationic defects, the reconstruction phenomenon of CuS nanomaterials are that S2- is firstly oxidized to SO4 2- and then Cux + is converted into CuO via Cu(OH)2 . In addition, the specific "modified hourglass structure" of CuS with excellent conductivity is easier to produce intermediates. Compared with Cu2 S, CuS exhibits excellent OER activity with a lower overpotential of 192 mV at 10 mA cm-2 and remarkable electrochemical stability in 1.0 m KOH for 120 h. Herein, this study elucidates the reconstruction modes of CuS and Cu2 S in the OER process and reveals that CuS has a stronger CuS bond and a faster electronic transmission efficiency due to "modified hourglass structure," resulting in faster reconstruction of CuS than Cu2 S.
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Affiliation(s)
- Jiamin Zhu
- State Key Laboratory of Applied Organic Chemistry, Frontiers Science Center for Rare Isotopes, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Shengjie Zi
- State Key Laboratory of Applied Organic Chemistry, Frontiers Science Center for Rare Isotopes, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Nan Zhang
- State Key Laboratory of Applied Organic Chemistry, Frontiers Science Center for Rare Isotopes, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Yang Hu
- State Key Laboratory of Applied Organic Chemistry, Frontiers Science Center for Rare Isotopes, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Li An
- State Key Laboratory of Applied Organic Chemistry, Frontiers Science Center for Rare Isotopes, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Pinxian Xi
- State Key Laboratory of Applied Organic Chemistry, Frontiers Science Center for Rare Isotopes, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
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7
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Fernández-Climent R, Redondo J, García-Tecedor M, Spadaro MC, Li J, Chartrand D, Schiller F, Pazos J, Hurtado MF, de la Peña O’Shea V, Kornienko N, Arbiol J, Barja S, Mesa CA, Giménez S. Highly Durable Nanoporous Cu 2-xS Films for Efficient Hydrogen Evolution Electrocatalysis under Mild pH Conditions. ACS Catal 2023; 13:10457-10467. [PMID: 37564127 PMCID: PMC10411506 DOI: 10.1021/acscatal.3c01673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 06/30/2023] [Indexed: 08/12/2023]
Abstract
Copper-based hydrogen evolution electrocatalysts are promising materials to scale-up hydrogen production due to their reported high current densities; however, electrode durability remains a challenge. Here, we report a facile, cost-effective, and scalable synthetic route to produce Cu2-xS electrocatalysts, exhibiting hydrogen evolution rates that increase for ∼1 month of operation. Our Cu2-xS electrodes reach a state-of-the-art performance of ∼400 mA cm-2 at -1 V vs RHE under mild conditions (pH 8.6), with almost 100% Faradaic efficiency for hydrogen evolution. The rise in current density was found to scale with the electrode electrochemically active surface area. The increased performance of our Cu2-xS electrodes correlates with a decrease in the Tafel slope, while analyses by X-ray photoemission spectroscopy, operando X-ray diffraction, and in situ spectroelectrochemistry cooperatively revealed the Cu-centered nature of the catalytically active species. These results allowed us to increase fundamental understanding of heterogeneous electrocatalyst transformation and consequent structure-activity relationship. This facile synthesis of highly durable and efficient Cu2-xS electrocatalysts enables the development of competitive electrodes for hydrogen evolution under mild pH conditions.
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Affiliation(s)
- Roser Fernández-Climent
- Institute
of Advanced Materials (INAM), Universitat
Jaume I, Av. de Vicente Sos Baynat, s/n, 12006 Castelló, Spain
| | - Jesús Redondo
- Department
of Polymers and Advanced Materials, Centro de Física de Materiales, University of the Basque Country UPV/EHU, 20018 San Sebastián, Spain
- Department
of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, 180 00 Prague 8, Czech Republic
| | - Miguel García-Tecedor
- Institute
of Advanced Materials (INAM), Universitat
Jaume I, Av. de Vicente Sos Baynat, s/n, 12006 Castelló, Spain
- Photoactivated
Processes Unit, IMDEA Energy Institute,
Parque Tecnológico de Móstoles, Avda. Ramón de la Sagra 3, 28935 Móstoles, Madrid, Spain
| | - Maria Chiara Spadaro
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2) and BIST Campus
UAB, Bellaterra 08193, Barcelona, Catalonia, Spain
| | - Junnan Li
- Department
of Chemistry, Université de Montréal, 1375 Ave. Thérèse-Lavoie-Roux, Montréal, QC H2V 0B3, Canada
| | - Daniel Chartrand
- Department
of Chemistry, Université de Montréal, 1375 Ave. Thérèse-Lavoie-Roux, Montréal, QC H2V 0B3, Canada
| | - Frederik Schiller
- Centro
de Física de Materiales and Material Physics Center CSIC/UPV-EHU, Manuel Lardizabal 5, 20018 San Sebastián, Spain
- Donostia
International Physics Center, 20018 San Sebastián, Spain
| | - Jhon Pazos
- Research
Cluster on Converging Sciences and Technologies (NBIC), Departamento
de Ingeniería Electrónica, Universidad Central, Calle 5 No 21-38, Bogotá 110311, Colombia
| | - Mikel F. Hurtado
- Research
Cluster on Converging Sciences and Technologies (NBIC), Departamento
de Ingeniería Electrónica, Universidad Central, Calle 5 No 21-38, Bogotá 110311, Colombia
- Materials
Chemistry Area, Civil Engineering Department, Corporación Universitaria
Minuto de Dios, Calle 80, Main Sede Bogotá, Colombia. −
Nanotechnology Applications Area, Environmental Engineering Department, Universidad Militar Nueva Granada, Km 2 via Cajicá, Zipaquirá 110311, Colombia
| | - Victor de la Peña O’Shea
- Photoactivated
Processes Unit, IMDEA Energy Institute,
Parque Tecnológico de Móstoles, Avda. Ramón de la Sagra 3, 28935 Móstoles, Madrid, Spain
| | - Nikolay Kornienko
- Department
of Chemistry, Université de Montréal, 1375 Ave. Thérèse-Lavoie-Roux, Montréal, QC H2V 0B3, Canada
| | - Jordi Arbiol
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2) and BIST Campus
UAB, Bellaterra 08193, Barcelona, Catalonia, Spain
- ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Catalonia, Spain
| | - Sara Barja
- Department
of Polymers and Advanced Materials, Centro de Física de Materiales, University of the Basque Country UPV/EHU, 20018 San Sebastián, Spain
- Donostia
International Physics Center, 20018 San Sebastián, Spain
- IKERBASQUE,
Basque Foundation for Science, 48009 Bilbao, Spain
| | - Camilo A. Mesa
- Institute
of Advanced Materials (INAM), Universitat
Jaume I, Av. de Vicente Sos Baynat, s/n, 12006 Castelló, Spain
- Research
Cluster on Converging Sciences and Technologies (NBIC), Departamento
de Ingeniería Electrónica, Universidad Central, Calle 5 No 21-38, Bogotá 110311, Colombia
| | - Sixto Giménez
- Institute
of Advanced Materials (INAM), Universitat
Jaume I, Av. de Vicente Sos Baynat, s/n, 12006 Castelló, Spain
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Adak M, Basak HK, Chakraborty B. Ease of Electrochemical Arsenate Dissolution from FeAsO 4 Microparticles during Alkaline Oxygen Evolution Reaction. ACS ORGANIC & INORGANIC AU 2023; 3:223-232. [PMID: 37545654 PMCID: PMC10401858 DOI: 10.1021/acsorginorgau.3c00007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 05/12/2023] [Accepted: 05/15/2023] [Indexed: 08/08/2023]
Abstract
Transition metal-based ABO4-type materials have now been paid significant attention due to their excellent electrochemical activity. However, a detailed study to understand the active species and its electro-evolution pathway is not traditionally performed. Herein, FeAsO4, a bimetallic ABO4-type oxide, has been prepared solvothermally. In-depth microscopic and spectroscopic studies showed that the as-synthesized cocoon-like FeAsO4 microparticles consist of several small individual nanocrystals with a mixture of monoclinic and triclinic phases. While depositing FeAsO4 on three-dimensional nickel foam (NF), it can show oxygen evolution reaction (OER) in a moderate operating potential. During the electrochemical activation of the FeAsO4/NF anode through cyclic voltammetric (CV) cycles prior to the OER study, an exponential increment in the current density (j) was observed. An ex situ Raman study with the electrode along with field emission scanning electron microscopy imaging showed that the pronounced OER activity with increasing number of CV cycles is associated with a rigorous morphological and chemical change, which is followed by [AsO4]3- leaching from FeAsO4. A chronoamperometric study and subsequent spectro- and microscopic analyses of the isolated sample from the electrode show an amorphous γ-FeO(OH) formation at the constant potential condition. The in situ formation of FeO(OH)ED (ED indicates electrochemically derived) shows better activity compared to pristine FeAsO4 and independently prepared FeO(OH). Tafel, impedance spectroscopic study, and determination of electrochemical surface area have inferred that the in situ formed FeO(OH)ED shows better electro-kinetics and possesses higher surface active sites compared to its parent FeAsO4. In this study, the electrochemical activity of FeAsO4 has been correlated with its structural integrity and unravels its electro-activation pathway by characterizing the active species for OER.
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9
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Mallick L, Chakraborty B. Ionic γ-FeO(OH) Nanocrystal Stabilized by Small Isopolymolybdate Clusters as Reactive Core for Water Oxidation. Chemistry 2023; 29:e202203033. [PMID: 36310518 DOI: 10.1002/chem.202203033] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 10/27/2022] [Accepted: 10/31/2022] [Indexed: 12/13/2022]
Abstract
At near neutral to basic pH, hydrolysis-induced aggregation to insoluble bulk iron-oxide is often regarded as the pitfalls of molecular iron clusters. Iron-oxide nanocrystals are encouragingly active over the molecular clusters and/or bulk oxides albeit, stabilizing such nanostructures in aqueous pH and under turnover condition remain a perdurable challenge. Herein, an Anderson-type [Mo7 O24 ]6- isopolyanion, a small (dimension ca. 0.85 nm) isolable polyoxometalate (POM) possessing only {31} atoms, has been introduced for the first time as a covalent linker to stabilize an infinitely stable and aqueous-soluble γ-FeO(OH) nanocore. During the hydrothermal isolation of the material, a partial dissociation of the parent [Mo7 O24 ]6- may lead to the in situ generation of few analogous [Mox Oy ]n- clusters, proved by Raman study, which can also participate in stabilizing the γ-FeO(OH) nanocore, Mox Oy @FeO(OH). However, due to high ionic charge on {Mo=O} terminals of the [Mox Oy ]n- , they are covalently linked via MoVI -μ2 O-FeIII bridging to γ-FeO(OH) core in Mox Oy @FeO(OH), established by numerous spectroscopic and microscopic evidence. Such bonding mode is more likely as precedent from the coordination motif documented in the transition metal clusters stabilized by this POM. The γ-FeO(OH) nanocore of Mox Oy @FeO(OH) behaves as potent active center for electrochemical water oxidation with a overpotential, 263 mV @ 10 mA cm-2 , lower than that observed for bare γ-FeO(OH). Despite of some molybdenum dissolution from the POM ligands to the electrolyte, residual anionic POM fragments covalently bound to the OER active γ-FeO(OH) core of the Mox Oy @FeO(OH) makes the surface predominantly ionic that results in an ordered electrical double layer to promote a better charge transport across the electrode-electrolyte junction, less likely in bulk γ-FeO(OH).
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Affiliation(s)
- Laxmikanta Mallick
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India
| | - Biswarup Chakraborty
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India
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10
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Zhao HF, Yue YT, Fan YL, Wang JX, Li WH, Wei F, Liu M, Yu YH, Lu WT, Zhang G. In-situ Electrochemical Transformed Cu Oxide from Cu Sulfide for Efficient Upgrading of Biomass Derived 5-Hydroxymethylfurfural in Anion Exchange Membrane Electrolyzer. CHEMSUSCHEM 2022; 15:e202201625. [PMID: 36184569 DOI: 10.1002/cssc.202201625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/22/2022] [Indexed: 06/16/2023]
Abstract
The electrochemical transformation of biomass to high value-added products is attractive. Herein, Cu sulfide-mediated in-situ synthesis of Cu oxide was achieved for efficient electro-oxidation of biomass derived 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA). The copper foam-supported Cu sulfide (Cu-S/CF) was in-situ converted to Cu oxide during the electro-oxidation process. The in-situ formed Cu oxide presented high HMF conversion, FDCA yield, and faradaic efficiency in 1 m KOH with HMF concentration up to 100 mm. The oxidation of HMF on Cu oxide started with the formation of high-valence Cu species with the assistance of OH- , which then oxidized HMF spontaneously. An anion exchange membrane (AEM) electrolyzer with Cu-S/CF as the anode was assembled to continuously produce FDCA with H2 generation at the cathode. The AEM electrolyzer ran stably for 60 h with FDCA content higher than 85 % at a cell voltage between 1.50 and 1.60 V.
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Affiliation(s)
- Heng-Fan Zhao
- State Key Laboratory of Precision Blasting, Jianghan University, 430056, Wuhan, P. R. China
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University, 430056, Wuhan, P. R. China
- Institute for Interdisciplinary Research, School of Optoelectronic Materials and Technology, Jianghan University, 430056, Wuhan, P. R. China
| | - Yu-Ting Yue
- State Key Laboratory of Precision Blasting, Jianghan University, 430056, Wuhan, P. R. China
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University, 430056, Wuhan, P. R. China
- Institute for Interdisciplinary Research, School of Optoelectronic Materials and Technology, Jianghan University, 430056, Wuhan, P. R. China
| | - Yi-Lin Fan
- State Key Laboratory of Precision Blasting, Jianghan University, 430056, Wuhan, P. R. China
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University, 430056, Wuhan, P. R. China
- Institute for Interdisciplinary Research, School of Optoelectronic Materials and Technology, Jianghan University, 430056, Wuhan, P. R. China
| | - Ji-Xiang Wang
- Institute for Interdisciplinary Research, School of Optoelectronic Materials and Technology, Jianghan University, 430056, Wuhan, P. R. China
| | - Wen-Hui Li
- State Key Laboratory of Precision Blasting, Jianghan University, 430056, Wuhan, P. R. China
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University, 430056, Wuhan, P. R. China
- Institute for Interdisciplinary Research, School of Optoelectronic Materials and Technology, Jianghan University, 430056, Wuhan, P. R. China
| | - Feng Wei
- State Key Laboratory of Precision Blasting, Jianghan University, 430056, Wuhan, P. R. China
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University, 430056, Wuhan, P. R. China
- Institute for Interdisciplinary Research, School of Optoelectronic Materials and Technology, Jianghan University, 430056, Wuhan, P. R. China
| | - Min Liu
- State Key Laboratory of Precision Blasting, Jianghan University, 430056, Wuhan, P. R. China
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University, 430056, Wuhan, P. R. China
- Institute for Interdisciplinary Research, School of Optoelectronic Materials and Technology, Jianghan University, 430056, Wuhan, P. R. China
| | - Yan-Hua Yu
- State Key Laboratory of Precision Blasting, Jianghan University, 430056, Wuhan, P. R. China
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University, 430056, Wuhan, P. R. China
- Institute for Interdisciplinary Research, School of Optoelectronic Materials and Technology, Jianghan University, 430056, Wuhan, P. R. China
| | - Wang-Ting Lu
- State Key Laboratory of Precision Blasting, Jianghan University, 430056, Wuhan, P. R. China
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University, 430056, Wuhan, P. R. China
- Institute for Interdisciplinary Research, School of Optoelectronic Materials and Technology, Jianghan University, 430056, Wuhan, P. R. China
| | - Geng Zhang
- Department of Chemistry, College of Science, Huazhong Agricultural University, 430070, Wuhan, P. R. China
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Electrochemical Oxidation of 1-Propanol through Proton Exchange Membrane Electrolysis. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.117009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Rajput A, Adak MK, Chakraborty B. Intrinsic Lability of NiMoO 4 to Excel the Oxygen Evolution Reaction. Inorg Chem 2022; 61:11189-11206. [PMID: 35830301 DOI: 10.1021/acs.inorgchem.2c01167] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Nickel-based bimetallic oxides such as NiMoO4 and NiWO4, when deposited on the electrode substrate, show remarkable activity toward the electrocatalytic oxygen evolution reaction (OER). The stability of such nanostructures is nevertheless speculative, and catalytically active species have been less explored. Herein, NiMoO4 nanorods and NiWO4 nanoparticles are prepared via a solvothermal route and deposited on nickel foam (NF) (NiMoO4/NF and NiWO4/NF). After ensuring the chemical and structural integrity of the catalysts on electrodes, an OER study has been performed in the alkaline medium. After a few cyclic voltammetry (CV) cycles within the potential window of 1.0-1.9 V (vs reversible hydrogen electrode (RHE)), ex situ Raman analysis of the electrodes infers the formation of NiO(OH)ED (ED: electrochemically derived) from NiMoO4 precatalyst, while NiWO4 remains stable. A controlled study, stirring of NiMoO4/NF in 1 M KOH without applied potential, confirms that NiMoO4 hydrolyzes to the isolable NiO, which under a potential bias converts into NiO(OH)ED. Perhaps the more ionic character of the Ni-O-Mo bond in the NiMoO4 compared to the Ni-O-W bond in NiWO4 causes the transformation of NiMoO4 into NiO(OH)ED. A comparison of the OER performance of electrochemically derived NiO(OH)ED, NiWO4, ex-situ-prepared Ni(OH)2, and NiO(OH) confirmed that in-situ-prepared NiO(OH)ED remained superior with a substantial potential of 238 (±6) mV at 20 mA cm-2. The notable electrochemical performance of NiO(OH)ED can be attributed to its low Tafel slope value (26 mV dec-1), high double-layer capacitance (Cdl, 1.21 mF cm-2), and a low charge-transfer resistance (Rct, 1.76 Ω). The NiO(OH)ED/NF can further be fabricated as a durable OER anode to deliver a high current density of 25-100 mA cm-2. Post-characterization of the anode proves the structural integrity of NiO(OH)ED even after 12 h of chronoamperometry at 1.595 V (vs reversible hydrogen electrode (RHE)). The NiO(OH)ED/NF can be a compatible anode to construct an overall water splitting (OWS) electrolyzer that can operate at a cell potential of 1.64 V to reach a current density of 10 mA cm-2. Similar to that on NF, NiMoO4 deposited on iron foam (IF) and carbon cloth (CC) also electrochemically converts into NiO(OH) to perform a similar OER activity. This work understandably demonstrates monoclinic NiMoO4 to be an inherently unstable electro(pre)catalyst, and its structural evolution to polycrystalline NiO(OH)ED succeeding the NiO phase is intrinsic to its superior activity.
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Affiliation(s)
- Anubha Rajput
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016 New Delhi, India
| | - Mrinal Kanti Adak
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016 New Delhi, India
| | - Biswarup Chakraborty
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016 New Delhi, India
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Pang X, Zhao H, Huang Y, Liu Y, Bai H, Fan W, Shi W. In Situ Electrochemical Reconstitution of CF-CuO/CeO 2 for Efficient Active Species Generation. Inorg Chem 2022; 61:8940-8954. [PMID: 35653625 DOI: 10.1021/acs.inorgchem.2c01338] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Achievement of the intrinsic activity by in situ electrochemical reconstruction has been becoming a great challenge for designing a catalyst. Herein, an effective electrochemical strategy is proposed to reconstruct the surface of the CF-CuO/CeO2 precursor. Under the stimulation of oxidative/reductive potential, abundant active sites were successfully generated on the surface of CF-CuO/CeO2. Remarkably, the implantation of oxygen vacancy-rich CeO2 synergistically optimizes the chemical composition and electronic structure of CF-CuO/CeO2, greatly promoting the generation of active species. Systematic electrochemical experiments indicate that the superior catalytic performance of reconstructed CF-CuO/CeO2 could be attributed to CuOOH/CeO2 and Cu2O/Ce2O3 active species, respectively. The oxidative-/reductive-activated CF-CuO/CeO2 was further employed in a paired cell for the synergistic catalysis of hydroxymethylfurfural oxidation with 4-nitrophenol hydrogenation. As a result, nearly 100% Faraday efficiency for furandicarboxylic acid/4-aminophenol production was achieved in the paired system (-0.9 V vs Ag/AgCl, 1.5 h). Therefore, the electrochemical reconstruction via oxidative/reductive activation has been confirmed as a feasible approach to significantly excite the intrinsic activity of a catalyst.
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Affiliation(s)
- Xuliang Pang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Huaiquan Zhao
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Yifei Huang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Youchao Liu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Hongye Bai
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Weiqiang Fan
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Weidong Shi
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China
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