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Chhetri M, Wan M, Jin Z, Yeager J, Sandor C, Rapp C, Wang H, Lee S, Bodenschatz CJ, Zachman MJ, Che F, Yang M. Dual-site catalysts featuring platinum-group-metal atoms on copper shapes boost hydrocarbon formations in electrocatalytic CO 2 reduction. Nat Commun 2023; 14:3075. [PMID: 37244900 DOI: 10.1038/s41467-023-38777-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 05/16/2023] [Indexed: 05/29/2023] Open
Abstract
Copper-based catalyst is uniquely positioned to catalyze the hydrocarbon formations through electrochemical CO2 reduction. The catalyst design freedom is limited for alloying copper with H-affinitive elements represented by platinum group metals because the latter would easily drive the hydrogen evolution reaction to override CO2 reduction. We report an adept design of anchoring atomically dispersed platinum group metal species on both polycrystalline and shape-controlled Cu catalysts, which now promote targeted CO2 reduction reaction while frustrating the undesired hydrogen evolution reaction. Notably, alloys with similar metal formulations but comprising small platinum or palladium clusters would fail this objective. With an appreciable amount of CO-Pd1 moieties on copper surfaces, facile CO* hydrogenation to CHO* or CO-CHO* coupling is now viable as one of the main pathways on Cu(111) or Cu(100) to selectively produce CH4 or C2H4 through Pd-Cu dual-site pathways. The work broadens copper alloying choices for CO2 reduction in aqueous phases.
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Affiliation(s)
- Manjeet Chhetri
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC, USA
| | - Mingyu Wan
- Department of Chemical Engineering, University of Massachusetts Lowell, Lowell, MA, USA
| | - Zehua Jin
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC, USA
| | - John Yeager
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC, USA
| | - Case Sandor
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC, USA
| | - Conner Rapp
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC, USA
| | - Hui Wang
- Institute for New Energy Materials and Low Carbon Technology, Tianjin University of Technology, Tianjin, China
| | - Sungsik Lee
- X-ray Science Division, Argonne National Laboratory, Lemont, IL, USA
| | - Cameron J Bodenschatz
- Environmental Effects and Coatings Branch, NASA John H. Glenn Research Center, Cleveland, OH, USA
| | - Michael J Zachman
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Fanglin Che
- Department of Chemical Engineering, University of Massachusetts Lowell, Lowell, MA, USA.
| | - Ming Yang
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC, USA.
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Abstract
Inspired by natural photosynthesis, various manganese oxides have been studied as co-catalysts with BiVO4 for photoelectrochemical water splitting.
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Affiliation(s)
- Manjodh Kaur
- New Chemistry Unit
- International Centre for Materials Science
- School of Advanced Materials and Sheikh Saqr Laboratory
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Jakkur P.O
| | - Manjeet Chhetri
- New Chemistry Unit
- International Centre for Materials Science
- School of Advanced Materials and Sheikh Saqr Laboratory
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Jakkur P.O
| | - C. N. R. Rao
- New Chemistry Unit
- International Centre for Materials Science
- School of Advanced Materials and Sheikh Saqr Laboratory
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Jakkur P.O
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3
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Vishnoi P, Pramoda K, Gupta U, Chhetri M, Balakrishna RG, Rao CNR. Covalently Linked Heterostructures of Phosphorene with MoS 2/MoSe 2 and Their Remarkable Hydrogen Evolution Reaction Activity. ACS Appl Mater Interfaces 2019; 11:27780-27787. [PMID: 31266296 DOI: 10.1021/acsami.9b06910] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hydrogen production by photochemical and electrochemical means is an important area of research related to renewable energy. 2D nanomaterials such as C3N4 and MoS2 have proven to be active for the hydrogen evolution reaction (HER). Phosphorene, a mono-elemental 2D layer of phosphorus, is known to catalyze the HER, but the activity is marginal. The use of phosphorene is also limited by its ambient instability. We have been able to prepare covalently cross-linked nanocomposites of phosphorene with MoS2 as well as MoSe2. The phosphorene-MoS2 nanocomposite shows excellent photochemical HER activity yielding 26.8 mmol h-1 g-1 of H2, while only a negligible amount is produced by the physical mixture of phosphorene and MoS2. The phosphorene-MoS2 composite also displays high electrochemical HER activity with an onset overpotential of 110 mV, close to that of Pt. The enhanced HER activity of the phosphorene-MoS2 nanocomposite can be attributed to the ordered cross-linking of the 2D sheets, increasing the interfacial area as well as the charge-transfer interaction between phosphorene and MoS2 layers. The phosphorene-MoSe2 nanocomposite also exhibits good photochemical HER activity.
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Affiliation(s)
- Pratap Vishnoi
- New Chemistry Unit, International Centre for Materials Science, School of Advanced Materials and Sheikh Saqr Laboratory , Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur P.O., Bangalore 560064 , India
| | - K Pramoda
- New Chemistry Unit, International Centre for Materials Science, School of Advanced Materials and Sheikh Saqr Laboratory , Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur P.O., Bangalore 560064 , India
| | - Uttam Gupta
- New Chemistry Unit, International Centre for Materials Science, School of Advanced Materials and Sheikh Saqr Laboratory , Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur P.O., Bangalore 560064 , India
| | - Manjeet Chhetri
- New Chemistry Unit, International Centre for Materials Science, School of Advanced Materials and Sheikh Saqr Laboratory , Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur P.O., Bangalore 560064 , India
| | - R Geetha Balakrishna
- New Chemistry Unit, International Centre for Materials Science, School of Advanced Materials and Sheikh Saqr Laboratory , Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur P.O., Bangalore 560064 , India
| | - C N R Rao
- New Chemistry Unit, International Centre for Materials Science, School of Advanced Materials and Sheikh Saqr Laboratory , Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur P.O., Bangalore 560064 , India
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Rao CNR, Chhetri M. Borocarbonitrides as Metal-Free Catalysts for the Hydrogen Evolution Reaction. Adv Mater 2019; 31:e1803668. [PMID: 30375670 DOI: 10.1002/adma.201803668] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Revised: 08/20/2018] [Indexed: 06/08/2023]
Abstract
Hydrogen generation by water splitting is clearly a predominant and essential strategy to tackle the problems related to renewable energy. In this context, the discovery of proper catalysts for electrochemical and photochemical water splitting assumes great importance. There is also a serious intent to eliminate platinum and other noble metal catalysts. To replace Pt by a non-metallic catalyst with desirable characteristics is a challenge. Borocarbonitrides, (Bx Cy Nz ) which constitutes a new class of 2D material, offer great promise as non-metallic catalysts because of the easy tunability of bandgap, surface area, and other electronic properties with variation in composition. Recently, Bx Cy Nz composites with excellent electrochemical and photochemical hydrogen generation activities have been found, especially noteworthy being the observation that Bx Cy Nz with a carbon-rich composition or its nanocomposites with MoS2 come close to Pt in electrocatalytic properties, showing equally good photochemical activity.
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Affiliation(s)
- Chintamani Nagesa Ramachandra Rao
- New Chemistry Unit, International Centre for Materials Science, Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore, 560064, India
| | - Manjeet Chhetri
- New Chemistry Unit, International Centre for Materials Science, Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore, 560064, India
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Ayyub MM, Chhetri M, Gupta U, Roy A, Rao CNR. Corrigendum: Photochemical and Photoelectrochemical Hydrogen Generation by Splitting Seawater. Chemistry 2019; 25:1601. [DOI: 10.1002/chem.201806325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Ayyub MM, Chhetri M, Gupta U, Roy A, Rao CNR. Corrigendum: Photochemical and Photoelectrochemical Hydrogen Generation by Splitting Seawater. Chemistry 2019. [DOI: 10.1002/chem.201806119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Ayyub MM, Chhetri M, Gupta U, Roy A, Rao CNR. Frontispiece: Photochemical and Photoelectrochemical Hydrogen Generation by Splitting Seawater. Chemistry 2018. [DOI: 10.1002/chem.201886964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Mohd Monis Ayyub
- New Chemistry UnitChemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India
| | - Manjeet Chhetri
- New Chemistry UnitChemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India
| | - Uttam Gupta
- New Chemistry UnitChemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India
| | - Anand Roy
- New Chemistry UnitChemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India
| | - C. N. R. Rao
- New Chemistry UnitChemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India
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8
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Ayyub MM, Chhetri M, Gupta U, Roy A, Rao CNR. Photochemical and Photoelectrochemical Hydrogen Generation by Splitting Seawater. Chemistry 2018; 24:18455-18462. [DOI: 10.1002/chem.201804119] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Mohd Monis Ayyub
- New Chemistry UnitChemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India
| | - Manjeet Chhetri
- New Chemistry UnitChemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India
| | - Uttam Gupta
- New Chemistry UnitChemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India
| | - Anand Roy
- New Chemistry UnitChemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India
| | - C. N. R. Rao
- New Chemistry UnitChemistry and Physics of Materials UnitJawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India
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9
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Roy A, Chhetri M, Prasad S, Waghmare UV, Rao CNR. Unique Features of the Photocatalytic Reduction of H 2O and CO 2 by New Catalysts Based on the Analogues of CdS, Cd 4P 2X 3 (X = Cl, Br, I). ACS Appl Mater Interfaces 2018; 10:2526-2536. [PMID: 29278485 DOI: 10.1021/acsami.7b15992] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Photochemical reduction of H2O and CO2 has been investigated with a new family of catalysts of the formula Cd4P2X3 (X= Cl, Br, I), obtained by the complete aliovalent substitution of the sulfide ions in CdS by P and X (Cl, Br, I). Unlike CdS, the Cd4P2X3 compounds exhibit hydrogen evolution and CO2 reduction from water even in the absence of a sacrificial agent or a cocatalyst. Use of NixPy as the cocatalyst, enhances hydrogen evolution, reaching 3870 (apparent quantum yield (AQY) = 4.11) and 9258 (AQY = 9.83) μmol h-1 g-1, respectively, under artificial and natural (sunlight) irradiation, in the case of Cd4P2Br3/NixPy. Electrochemical and spectroscopic studies have been employed to understand the photocatalytic activity of this family of compounds. Unlike most of the semiconductor-based photocatalysts, Cd4P2X3 catalysts reduce CO2 to CO and CH4 in the absence of sacrificial-agent or cocatalyst using water as the electron source. CO, CH4, and H2 have been obtained with these catalysts under artificial as well as sun-light irradiation. First-principles, calculations have been carried out to understand the electronic structure and catalytic features of these new catalysts.
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Affiliation(s)
- Anand Roy
- New Chemistry Unit, International Centre for Material Science (ICMS), CSIR Centre for Excellence in Chemistry, Sheikh Saqr Laboratory, Jawharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore 560064, India
| | - Manjeet Chhetri
- New Chemistry Unit, International Centre for Material Science (ICMS), CSIR Centre for Excellence in Chemistry, Sheikh Saqr Laboratory, Jawharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore 560064, India
| | - Suchitra Prasad
- Theoretical Science Unit, Jawharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore 560064, India
| | - Umesh V Waghmare
- Theoretical Science Unit, Jawharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore 560064, India
| | - C N R Rao
- New Chemistry Unit, International Centre for Material Science (ICMS), CSIR Centre for Excellence in Chemistry, Sheikh Saqr Laboratory, Jawharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore 560064, India
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10
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Chhetri M, Rao CNR. Photoelectrochemical hydrogen generation employing a Cu2O-based photocathode with improved stability and activity by using NixPy as the cocatalyst. Phys Chem Chem Phys 2018; 20:15300-15306. [DOI: 10.1039/c7cp08560e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
With the tactical integration of band edge energetics concepts in semiconducting films to reduce charge recombination and photocorrosion, an improvement in the photocurrent can be achieved by introducing CuO and NixPy into Cu2O films.
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Affiliation(s)
- Manjeet Chhetri
- New Chemistry Unit
- International Centre for Materials Science and Sheikh Saqr Laboratory
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560064
- India
| | - C. N. R. Rao
- New Chemistry Unit
- International Centre for Materials Science and Sheikh Saqr Laboratory
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560064
- India
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11
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Pramoda K, Gupta U, Chhetri M, Bandyopadhyay A, Pati SK, Rao CNR. Nanocomposites of C 3N 4 with Layers of MoS 2 and Nitrogenated RGO, Obtained by Covalent Cross-Linking: Synthesis, Characterization, and HER Activity. ACS Appl Mater Interfaces 2017; 9:10664-10672. [PMID: 28267317 DOI: 10.1021/acsami.7b00085] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Generation of hydrogen by photochemical, electrochemical, and other means is a vital area of research today, and a variety of materials have been explored as catalysts for this purpose. C3N4, MoS2, and nitrogenated RGO (NRGO) are some of the important catalytic materials investigated for the hydrogen evolution reaction (HER) reaction, but the observed catalytic activities are somewhat marginal. Prompted by preliminary reports that covalent cross-linking of 2D materials to generate heteroassemblies or nanocomposites may have beneficial effect on the catalytic activity, we have synthesized nanocomposites wherein C3N4 is covalently bonded to MoS2 or NRGO nanosheets. The photochemical HER activity of the C3N4-MoS2 nanocomposite is found to be remarkable with an activity of 12778 μmol h-1 g-1 and a turnover frequency of 2.35 h-1. The physical mixture of C3N4 and MoS2, on the other hand, does not exhibit notable catalytic activity. Encouraged by this result, we have studied electrochemical HER activity of these composites as well. C3N4-MoS2 shows superior activity relative to a physical mixture of MoS2 and C3N4. Density functional theory calculations have been carried out to understand the HER activity of the nanocomposites. Charge-transfer between the components and greater planarity of cross-linked layers are important causes of the superior catalytic activity of the nanocomposites. Covalent linking of such 2D materials appears to be a worthwhile strategy for catalysis and other applications.
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Affiliation(s)
- K Pramoda
- New Chemistry Unit, Chemistry and Physics of Materials Unit, CSIR Centre of Excellence in Chemistry, Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P. O., Bangalore 560064, India
| | - U Gupta
- New Chemistry Unit, Chemistry and Physics of Materials Unit, CSIR Centre of Excellence in Chemistry, Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P. O., Bangalore 560064, India
| | - M Chhetri
- New Chemistry Unit, Chemistry and Physics of Materials Unit, CSIR Centre of Excellence in Chemistry, Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P. O., Bangalore 560064, India
| | - A Bandyopadhyay
- New Chemistry Unit, Chemistry and Physics of Materials Unit, CSIR Centre of Excellence in Chemistry, Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P. O., Bangalore 560064, India
| | - S K Pati
- New Chemistry Unit, Chemistry and Physics of Materials Unit, CSIR Centre of Excellence in Chemistry, Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P. O., Bangalore 560064, India
| | - C N R Rao
- New Chemistry Unit, Chemistry and Physics of Materials Unit, CSIR Centre of Excellence in Chemistry, Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) , Jakkur P. O., Bangalore 560064, India
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12
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Chhetri M, Gupta U, Yadgarov L, Rosentsveig R, Tenne R, Rao CNR. Effects of p- and n-type Doping in Inorganic Fullerene MoS2on the Hydrogen Evolution Reaction. ChemElectroChem 2016. [DOI: 10.1002/celc.201600291] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Manjeet Chhetri
- New Chemistry Unit; Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O.; Bangalore 560064 India
| | - Uttam Gupta
- Chemistry and Physics of Materials Unit, Sheikh Saqr Laboratory; Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O.; Bangalore 560064 India
| | - Lena Yadgarov
- Department of Material Science and Interfaces; Weizmann Institute; Rehovot 76100 Israel
| | - Rita Rosentsveig
- Department of Material Science and Interfaces; Weizmann Institute; Rehovot 76100 Israel
| | - Reshef Tenne
- Department of Material Science and Interfaces; Weizmann Institute; Rehovot 76100 Israel
| | - C. N. R. Rao
- New Chemistry Unit; Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O.; Bangalore 560064 India
- Chemistry and Physics of Materials Unit, Sheikh Saqr Laboratory; Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O.; Bangalore 560064 India
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Rana M, Patil PK, Chhetri M, Dileep K, Datta R, Gautam UK. Pd–Pt alloys nanowires as support-less electrocatalyst with high synergistic enhancement in efficiency for methanol oxidation in acidic medium. J Colloid Interface Sci 2016; 463:99-106. [DOI: 10.1016/j.jcis.2015.10.042] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 10/14/2015] [Accepted: 10/16/2015] [Indexed: 10/22/2022]
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Chhetri M, Rana M, Loukya B, Patil PK, Datta R, Gautam UK. Mechanochemical Synthesis of Free-Standing Platinum Nanosheets and Their Electrocatalytic Properties. Adv Mater 2015; 27:4430-4437. [PMID: 26100079 DOI: 10.1002/adma.201501056] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 05/18/2015] [Indexed: 06/04/2023]
Abstract
Robust, 26 nm thick free-standing platinum nanosheets, an extremely rare morphology for metal nanostructures, are obtained by employing fluid induced shearing force of the order of 1.8 N and differential shear-stress of 0.5 kPa across the diameter of a Te template nanorod undergoing galvanic displacement by Pt4+ . Corrugation leads to their large surface area and much improved electrocatalytic properties when compared with conventional Pt catalysts.
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Affiliation(s)
- Manjeet Chhetri
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, 560064, India
| | - Moumita Rana
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
| | - B Loukya
- International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, 560064, India
| | - Pramod K Patil
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, 560064, India
| | - Ranjan Datta
- International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, 560064, India
| | - Ujjal K Gautam
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
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Rana M, Chhetri M, Loukya B, Patil PK, Datta R, Gautam UK. High-yield synthesis of sub-10 nm Pt nanotetrahedra with bare ⟨111⟩ facets for efficient electrocatalytic applications. ACS Appl Mater Interfaces 2015; 7:4998-5005. [PMID: 25660263 DOI: 10.1021/acsami.5b00211] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Unlike other shapes, the design of tetrahedral Pt nanocrystals (Pt-NTd), which have the largest number of Pt(111) surface atoms and highest catalytic activities toward the electron transfer reactions, has widely been considered a synthetic challenge due to their thermodynamic instability. Here, we show that, by inducing their nucleation on functionalized carbon, Pt NTds can be obtained with tunable sizes and high yields. The carbon support anchors the nanocrystals early and prevents their oriented attachment leading to nanowire formation. Therein, an in situ generated amine is crucial for stabilization of Pt-NTds, which can later be removed to expose the Pt(111) facets for higher catalytic efficiency. The bare nanocrystals exhibit much improved stability and electrocatalytic activity characteristic of Pt(111) toward oxygen reduction reaction (ORR) and methanol and formic acid oxidation reactions. For example, ∼90% of their activity was retained after 5000 potential cycles, while the ORR onset potential was recorded to be very high, 1.01 V vs reversible hydrogen electrode (RHE).
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Affiliation(s)
- Moumita Rana
- New Chemistry Unit, ∥International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore 560064, India
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Chhetri M, Gupta U, Yadgarov L, Rosentsveig R, Tenne R, Rao CNR. Beneficial effect of Re doping on the electrochemical HER activity of MoS2 fullerenes. Dalton Trans 2015; 44:16399-404. [DOI: 10.1039/c5dt02562a] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The combined synergistic effect of Re doping and the IF structure on MoS2 for enhancing the electrochemical hydrogen evolution reaction.
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Affiliation(s)
- Manjeet Chhetri
- New Chemistry Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560064
- India
| | - Uttam Gupta
- Chemistry and Physics of Materials Unit
- Sheikh Saqr Laboratory
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560064
- India
| | - Lena Yadgarov
- Department of Material Science and Interfaces
- Weizmann Institute
- Rehovot 76100
- Israel
| | - Rita Rosentsveig
- Department of Material Science and Interfaces
- Weizmann Institute
- Rehovot 76100
- Israel
| | - Reshef Tenne
- Department of Material Science and Interfaces
- Weizmann Institute
- Rehovot 76100
- Israel
| | - C. N. R. Rao
- New Chemistry Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore 560064
- India
- Chemistry and Physics of Materials Unit
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Wilhelm M, Chhetri M, Rychtář J, Rueppell O. A Game Theoretical Analysis of the Mating Sign Behavior in the Honey Bee. Bull Math Biol 2010; 73:626-38. [DOI: 10.1007/s11538-010-9544-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2008] [Accepted: 04/15/2010] [Indexed: 11/27/2022]
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Abstract
Cardiac involvement in 75 cases (mean age 21.1 +/- 6 years) with non-specific aorto-arteritis was studied. Detailed clinical examination, echocardiography and cardiac catheterization, including angiography, were done in all the cases, as was coronary angiography. Features of cardiac failure like sinus tachycardia, cardiomegaly, left ventricular third heart sound gallop and pulmonary congestion were detected in 27 cases with reduction of left ventricular ejection fraction (25-48%). Systemic hypertension was seen in 60 cases. Central aortic pressure, left ventricular systolic pressure and left ventricular end-diastolic pressure were increased in 66 cases. Pulmonary hypertension and increased pulmonary vascular resistance were detected in 6 cases. Aortic and mitral regurgitation were seen in 15 and 12 cases, respectively. Three patients had features of dilated cardiomyopathy such as generalized cardiomegaly, systemic and pulmonary congestion but without any cardiac murmurs and with normal central aortic pressure. The coronary angiogram revealed obstruction of the left anterior descending artery in 3 cases and right coronary artery obstruction in another 3 cases. Histopathological studies revealed non-specific inflammatory changes with fibrosis in cardiac musculature and the great vessels.
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Affiliation(s)
- M Panja
- Department of Cardiology, Institute of Post-Graduate Medical Education and Research, Calcutta, India
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Panja M, Chhetri M, Satpati A, Panja S. An unusual extension of pericardial effusion in a case of pulmonary adenocarcinoma. J Assoc Physicians India 1989; 37:181-3. [PMID: 2808289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A case of pericardial metastasis from adenocarcinoma of lung was having a separate paratracheal bulge at left border of aorta mimicking a tumour. This was a very uncommon extension of pericardial effusion. Interestingly this mediastinal bulge on left border of aorta disappeared completely immediately after pericardio-centesis. The rarity of chest roentgenographic findings prompted us to report this case.
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Panja M, Kar AK, Panja S, Chhetri M. Pulmonary involvement in non-specific aorto-arteritis in eastern India. J Assoc Physicians India 1988; 36:699-701. [PMID: 2906934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Panja M, Mitra K, Kar AK, Chhetri M, Panja S, Mitra J, Lahiri D. A clinical profile of heart disease in pregnancy. Indian Heart J 1986; 38:392-6. [PMID: 3570326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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Maity AK, Ganguly K, Chatterjee SS, Chhetri M, Kar CC. Ventricular pacing in sick sinus syndrome--a long term follow-up. Indian Heart J 1986; 38:188-91. [PMID: 3557518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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Maity AK, Ganguly K, Chatterjee SS, Chhetri M, Kar CC. Experience with multiprogrammable pacemakers. Indian Heart J 1986; 38:138-42. [PMID: 3557507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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