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Qin G, Ma H, Tian M, Yu X, Li L, Zhang X, Lu Z, Yang X. MnS-BaS Heterostructures as Effective Catalysts for Oxygen Reduction Reaction. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38603463 DOI: 10.1021/acsami.4c01213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
The inadequate electrical conductivity of metal sulfides, along with their tendency to agglomerate, has hindered their use in energy storage and catalysis. The construction of a heterojunction can ameliorate these deficiencies to some extent. In this paper, MnS-BaS heterojunction catalysts were prepared by a hydrothermal method, which is a simple and inexpensive process. The MnS-BaS heterojunction catalysts exhibited superior performance owing to the strong synergistic interaction between MnS and BaS. Density functional theory (DFT) calculations reveal strong interactions at the heterojunction interface and significant electron transfer between MnS and BaS, which further modulates the electronic structure of Mn. The elevation of the center of the d-band enhances the adsorption of oxygen and oxygen-containing intermediates on the catalyst, thus promoting the oxygen reduction reaction (ORR). The practical application of MnS-BaS catalysts was tested by assembling zinc-air batteries. This study provides a rational strategy for designing transition metal catalysts that are efficient and low cost.
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Affiliation(s)
- Guoqing Qin
- School of Materials Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, PR China
| | - Haoliang Ma
- School of Materials Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, PR China
| | - Mengmeng Tian
- School of Materials Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, PR China
| | - Xiaofei Yu
- School of Materials Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, PR China
| | - Lanlan Li
- School of Materials Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, PR China
| | - Xinghua Zhang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, PR China
| | - Zunming Lu
- School of Materials Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, PR China
| | - Xiaojing Yang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, PR China
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2
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Huerta-Aguilar CA, Srivastava R, Arenas-Alatorre JA, Thangarasu P. Reductive Oligomerization of Nitroaniline Catalyzed by Fe 3O 4 Spheres Decorated with Group 11 Metal Nanoparticles. ACS OMEGA 2023; 8:7459-7469. [PMID: 36873030 PMCID: PMC9979374 DOI: 10.1021/acsomega.2c06326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 12/22/2022] [Indexed: 06/18/2023]
Abstract
The present work demonstrates a simple and sustainable method for forming azo oligomers from low-value compounds such as nitroaniline. The reductive oligomerization of 4-nitroaniline was achieved via azo bonding using nanometric Fe3O4 spheres doped with metallic nanoparticles (Cu NPs, Ag NPs, and Au NPs), which were characterized by different analytical methods. The magnetic saturation (M s) of the samples showed that they are magnetically recoverable from aqueous environments. The effective reduction of nitroaniline followed pseudo-first-order kinetics, reaching a maximum conversion of about 97%. Fe3O4-Au is the best catalyst, its a reaction rate (k Fe3O4-Au = 0.416 mM L-1 min-1) is about 20 times higher than that of bare Fe3O4 (k Fe3O4 = 0.018 mM L-1 min-1). The formation of the two main products was determined by high-performance liquid chromatography-mass spectrometry (HPLC-MS), evidencing the effective oligomerization of NA through N = N azo linkage. It is consistent with the total carbon balance and the structural analysis by density functional theory (DFT)-based total energy. The first product, a six-unit azo oligomer, was formed at the beginning of the reaction through a shorter, two-unit molecule. The nitroaniline reduction is controllable and thermodynamically viable, as shown in the computational studies.
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Affiliation(s)
| | - Rajendra Srivastava
- Department
of Chemistry, Indian Institute of Technology
Ropar, Rupnagar 140001, Panjab, India
| | - Jesús A. Arenas-Alatorre
- Instituto
de Física, Universidad Nacional Autónoma
de México (UNAM), Cd. Universitaria, 04510 México, D. F., México
| | - Pandiyan Thangarasu
- Faculty
of Chemistry, National Autonomous University
of Mexico (UNAM), 04510 Mexico City, Mexico
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3
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Balamurugan C, Lee C, Cho K, Kim J, Park B, Pak Y, Kong J, Kwon S. Hydrothermally Grown Dual-Phase Heterogeneous Electrocatalysts for Highly Efficient Rechargeable Metal-Air Batteries with Long-Term Stability. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2203663. [PMID: 36104225 PMCID: PMC9661842 DOI: 10.1002/advs.202203663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/19/2022] [Indexed: 06/15/2023]
Abstract
Metal-air batteries as alternatives to the existing lithium-ion battery are becoming increasingly attractive sources of power due to their high energy-cost competitiveness and inherent safety; however, their low oxygen evolution and reduction reaction (OER/ORR) performance and poor operational stability must be overcome prior to commercialization. Herein, it is demonstrated that a novel class of hydrothermally grown dual-phase heterogeneous electrocatalysts, in which silver-manganese (AgMn) heterometal nanoparticles are anchored on top of 2D nanosheet-like nickel vanadium oxide (NiV2 O6 ), allows an enlarged surface area and efficient charge transfer/redistribution, resulting in a bifunctional OER/ORR superior to those of conventional Pt/C or RuO2 . The dual-phase NiV2 O6 /AgMn catalysts on the air cathode of a zinc-air battery lead to a stable discharge-charge voltage gap of 0.83 V at 50 mA cm-2 , with a specific capacity of 660 mAh g-1 and life cycle stabilities of more than 146 h at 10 mA cm-2 and 11 h at 50 mA cm-2 . The proposed new class of dual-phase NiV2 O6 /AgMn catalysts are successfully applied as pouch-type zinc-air batteries with long-term stability over 33.9 h at 10 mA cm-2 .
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Affiliation(s)
- Chandran Balamurugan
- Department of Energy and Materials EngineeringDongguk University‐SeoulSeoul04620Republic of Korea
- Heeger Center Advanced Materials (HCAM)Gwangju Institute of Science and Technology (GIST)Gwangju500‐712Republic of Korea
| | - Changhoon Lee
- Max Planck POSTECH Center for Complex Phase of MaterialsPohang University of Science and TechnologyPohang37673Korea
| | - Kyusang Cho
- Research Institute for Solar and Sustainable Energies (RISE)Gwangju Institute of Science and Technology (GIST)Gwangju500‐712Republic of Korea
| | - Jehan Kim
- Pohang Accelerator LaboratoryPohang University of Science and TechnologyPohang37673Republic of Korea
| | - Byoungwook Park
- Division of Advanced MaterialsKorea Research Institute of Chemical TechnologyDaejeon305‐600Republic of Korea
| | - Yusin Pak
- Sensor System Research Center (SSRC)Korea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
| | - Jaemin Kong
- Department of PhysicsGyeongsang National UniversityJinju52828Republic of Korea
| | - Sooncheol Kwon
- Department of Energy and Materials EngineeringDongguk University‐SeoulSeoul04620Republic of Korea
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5
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Ghubish Z, El-Kemary M. Influence of Li+ doping on the luminescence performance of green nano-phosphor CaWO4:Tb3+ as a sweat pores fingerprint and cheiloscopy sensor. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2021.11.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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Point of need simultaneous biosensing of pharmaceutical micropollutants with binder free conjugation of manganese stannate micro-rods on reduced graphene oxide in real-time analysis. J Taiwan Inst Chem Eng 2022. [DOI: 10.1016/j.jtice.2021.11.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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7
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Thundiyil S, Pandikassala A, Kurungot S, Devi RN. Tuning of Oxygen Reduction Pathways through Structural Variation in Transition Metal‐Doped Ba
2
In
2
O
5. ChemElectroChem 2022. [DOI: 10.1002/celc.202101163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Shibin Thundiyil
- Catalysis and Inorganic Chemistry Division CSIR-National Chemical Laboratory Pune 411008 India
- Academy of Innovative and Scientific Research (AcSIR) Ghaziabad 201002 India
| | - Ajmal Pandikassala
- Physical and Material Chemistry Division CSIR-National Chemical Laboratory Pune 411008 India
- Academy of Innovative and Scientific Research (AcSIR) Ghaziabad 201002 India
| | - Sreekumar Kurungot
- Physical and Material Chemistry Division CSIR-National Chemical Laboratory Pune 411008 India
- Academy of Innovative and Scientific Research (AcSIR) Ghaziabad 201002 India
| | - R. Nandini Devi
- Catalysis and Inorganic Chemistry Division CSIR-National Chemical Laboratory Pune 411008 India
- Academy of Innovative and Scientific Research (AcSIR) Ghaziabad 201002 India
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Dwivedi GD, Kumawat SM, Yen TW, Wang CW, Chandrasekhar Kakarla D, Joshi AG, Yang HD, Huang SM, Chou H. Understanding the correlation between orbital degree of freedom, lattice-striction and magneto-dielectric coupling in ferrimagnetic Mn 1.5Cr 1.5O 4. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:505802. [PMID: 34547729 DOI: 10.1088/1361-648x/ac28c3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 09/21/2021] [Indexed: 06/13/2023]
Abstract
Dielectric anomaly observed in cubic Mn1.5Cr1.5O4around ferrimagnetic ordering temperature (TN) suggests a possible magneto-dielectric coupling in the system. This report confirms the presence of a weak but significant magneto-dielectric coupling in the system. Theab initiocalculations show a band gap of around 1.2 eV, with Fermi-level closer to the conduction band. The major features of conduction band nearest to the Fermi-level correspond todxzandd3z2-r2orbitals of Mn3+ion. Temperature-dependent neutron diffraction results show a rapid decay in structural parameters (lattice-striction and transition metal-oxygen bond length) aroundTN.We confirmed that these changes in structural parameters atTNare not related to structural transition but the consequences of orbital-ordering of Mn3+. The rapid decay in transition metal-oxygen bond length under internal magnetism of the system shows that magnetism could certainly manipulate the electric dipole moment and hence the dielectric constant of the system. Magneto-striction acts as a link between magnetic and dielectric properties.
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Affiliation(s)
- G D Dwivedi
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - S M Kumawat
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - Tsung-Wen Yen
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - C W Wang
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan, Republic of China
| | - D Chandrasekhar Kakarla
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - Amish G Joshi
- CSIR-Central Glass & Ceramic Research Institute, Naroda Centre, 168-169 Naroda Industrial Estate, Ahmedabad-382 330, India
- CSIR-National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi 110012, India
| | - H D Yang
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - Shin-Ming Huang
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
| | - H Chou
- Department of Physics, and Center of Crystal Research, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, Republic of China
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Zhang S, Chen M, Zhao X, Cai J, Yan W, Yen JC, Chen S, Yu Y, Zhang J. Advanced Noncarbon Materials as Catalyst Supports and Non-noble Electrocatalysts for Fuel Cells and Metal–Air Batteries. ELECTROCHEM ENERGY R 2021. [DOI: 10.1007/s41918-020-00085-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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Abdelhafiz A, Zhao B, Xiao Z, Zeng J, Deng X, Lang L, Ding Y, Song H, Liu M. Facile Room-Temperature Synthesis of a Highly Active and Robust Single-Crystal Pt Multipod Catalyst for Oxygen Reduction Reaction. ACS APPLIED MATERIALS & INTERFACES 2020; 12:49510-49518. [PMID: 32897685 DOI: 10.1021/acsami.0c06652] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Economical production of highly active and robust Pt catalysts on a large scale is vital to the broad commercialization of polymer electrolyte membrane fuel cells. Here, we report a low-cost, one-pot process for large-scale synthesis of single-crystal Pt multipods with abundant high-index facets, in an aqueous solution without any template or surfactant. A composite consisting of the Pt multipods (40 wt %) and carbon displays a specific activity of 0.242 mA/cm2 and a mass activity of 0.109 A/mg at 0.9 V (versus a reversible hydrogen electrode) for oxygen reduction reaction, corresponding to ∼124% and ∼100% enhancement compared with those of the state-of-the-art commercial Pt/C catalyst (0.108 mA/cm2 and 0.054 A/mg). The single-crystal Pt multipods also show excellent stability when tested for 4500 cycles in a potential range of 0.6-1.1 V and another 2000 cycles in 0-1.2 V. More importantly, the superior performance of the Pt multipods/C catalyst is also demonstrated in a membrane electrode assembly (MEA), achieving a power density of 774 mW/cm2 (1.29 A/cm2) at 0.6 V and a peak power density of ∼1 W/cm2, representing 34% and 20% enhancement compared with those of a MEA based on the state-of-the-art commercial Pt/C catalyst (576 and 834 mW/cm2).
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Affiliation(s)
- Ali Abdelhafiz
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, United States
| | - Bote Zhao
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, United States
| | - Zhuojie Xiao
- Guangdong Key Lab for Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Jianhuang Zeng
- Guangdong Key Lab for Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Xiang Deng
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, United States
| | - Leiming Lang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, United States
| | - Yong Ding
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, United States
| | - Huiyu Song
- Guangdong Key Lab for Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Meilin Liu
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, United States
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11
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Thundiyil S, Vinod CP, Kurungot S, Devi RN. Role of B site ions in bifunctional oxygen electrocatalysis: a structure–property correlation study on doped Ca 2Fe 2O 5 brownmillerites. Phys Chem Chem Phys 2020; 22:15520-15527. [DOI: 10.1039/d0cp02391d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Evaluation of activity descriptors for electrochemical bifunctional oxygen catalysis in transition metal doped Ca2Fe2O5 brownmillerite oxide.
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Affiliation(s)
- Shibin Thundiyil
- Catalysis and Inorganic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - C. P. Vinod
- Catalysis and Inorganic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Sreekumar Kurungot
- Academy of Scientific and Innovative Research (AcSIR)
- Ghaziabad-201002
- India
- Physical and Material Chemistry Division
- CSIR-National Chemical Laboratory
| | - R. Nandini Devi
- Catalysis and Inorganic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
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12
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Role of precursors mixing sequence on the properties of CoMn 2O 4 cathode materials and their application in pseudocapacitor. Sci Rep 2019; 9:16852. [PMID: 31728012 PMCID: PMC6856552 DOI: 10.1038/s41598-019-53364-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 10/30/2019] [Indexed: 11/08/2022] Open
Abstract
In this study, the effect of oxygen vacancy in the CoMn2O4 on pseudocapacitive characteristics was examined, and two tetragonal CoMn2O4 spinel compounds with different oxygen vacancy concentrations and morphologies were synthesized by controlling the mixing sequence of the Co and Mn precursors. The mixing sequence was changed; thus, morphologies were changed from spherical nanoparticles to nanoflakes and oxygen vacancies were increased. Electrochemical studies have revealed that tetragonal CoMn2O4 spinels with a higher number of oxygen vacancies exhibit a higher specific capacitance of 1709 F g-1 than those with a lower number of oxygen vacancies, which have a higher specific capacitance of 990 F g-1. Oxygen vacancies create an active site for oxygen ion intercalation. Therefore, oxidation-reduction reactions occur because of the diffusion of oxygen ions at octahedral/tetrahedral crystal edges. The solid-state asymmetric pseudocapacitor exhibits a maximum energy density of 32 Wh-kg-1 and an excellent cyclic stability of nearly 100%.
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13
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Nanoporous noble metal-based alloys: a review on synthesis and applications to electrocatalysis and electrochemical sensing. Mikrochim Acta 2019; 186:664. [DOI: 10.1007/s00604-019-3772-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 08/16/2019] [Indexed: 11/24/2022]
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14
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Guo X, Zhang W, Zhang D, Qian S, Tong X, Zhou D, Zhang J, Yuan A. Submicron Co
9
S
8
/CoS/Carbon Spheres Derived from Bacteria for the Electrocatalytic Oxygen Reduction Reaction. ChemElectroChem 2019. [DOI: 10.1002/celc.201901266] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xingmei Guo
- School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu 212003 China
| | - Wei Zhang
- School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu 212003 China
| | - Di Zhang
- School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu 212003 China
| | - Silu Qian
- School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu 212003 China
| | - Xiangzhi Tong
- School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu 212003 China
| | - Dongcheng Zhou
- School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu 212003 China
| | - Junhao Zhang
- School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu 212003 China
| | - Aihua Yuan
- School of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu 212003 China
- Marine Equipment and Technology Institute Jiangsu University of Science and Technology Zhenjiang 212003 China
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15
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Liu J, Fan X, Liu X, Song Z, Deng Y, Han X, Hu W, Zhong C. Synthesis of Cubic-Shaped Pt Particles with (100) Preferential Orientation by a Quick, One-Step and Clean Electrochemical Method. ACS APPLIED MATERIALS & INTERFACES 2017; 9:18856-18864. [PMID: 28516779 DOI: 10.1021/acsami.7b04267] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A new approach has been developed for in situ preparing cubic-shaped Pt particles with (100) preferential orientation on the surface of the conductive support by using a quick, one-step, and clean electrochemical method with periodic square-wave potential. The whole electrochemical deposition process is very quick (only 6 min is required to produce cubic Pt particles), without the use of particular capping agents. The shape and the surface structure of deposited Pt particles can be controlled by the lower and upper potential limits of the square-wave potential. For a frequency of 5 Hz and an upper potential limit of 1.0 V (vs saturated calomel electrode), as the lower potential limit decreases to the H adsorption potential region, the Pt deposits are changed from nearly spherical particles to cubic-shaped (100)-oriented Pt particles. High-resolution transmission electron microscopy and selected-area electron diffraction reveal that the formed cubic Pt particles are single-crystalline and enclosed by (100) facets. Cubic Pt particles exhibit characteristic H adsorption/desorption peaks corresponding to the (100) preferential orientation. Ge irreversible adsorption indicates that the fraction of wide Pt(100) surface domains is 47.8%. The electrocatalytic activities of different Pt particles are investigated by ammonia electro-oxidation, which is particularly sensitive to the amount of Pt(100) sites, especially larger (100) domains. The specific activity of cubic Pt particles is 3.6 times as high as that of polycrystalline spherical Pt particles, again confirming the (100) preferential orientation of Pt cubes. The formation of cubic-shaped Pt particles is related with the preferential electrochemical deposition and dissolution processes of Pt, which are coupled with the periodic desorption and adsorption processes of O-containing species and H adatoms.
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Affiliation(s)
- Jie Liu
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Xiayue Fan
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Xiaorui Liu
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Zhishuang Song
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Yida Deng
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Xiaopeng Han
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Wenbin Hu
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
| | - Cheng Zhong
- Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education) and ‡Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University , Tianjin 300072, China
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