1
|
Vincent M, Avvaru VS, Haranczyk M, Etacheri V. High-Performance Mg-Li Hybrid Batteries Based on Pseudocapacitive Anatase Ti 1-x Co x O 2-y Nanosheet Cathodes. CHEMSUSCHEM 2022; 15:e202102562. [PMID: 35060341 DOI: 10.1002/cssc.202102562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 01/17/2022] [Indexed: 06/14/2023]
Abstract
Despite the proposed safety, performance, and cost advantages, practical implementation of Mg-Li hybrid batteries is limited due to the unavailability of reliable cathodes compatible with the dual-ion system. Herein, a high-performance Mg-Li dual ion battery based upon cobalt-doped TiO2 cathode was developed. Extremely pseudocapacitance-type Ti1-x Cox O2-y nanosheets consist of an optimum 3.57 % Co-atoms. This defective cathode delivered exceptional pseudocapacitance (maximum of 93 %), specific capacities (386 mAh g-1 at 25 mA g-1 ), rate performance (191 mAh g-1 at 1 A g-1 ), cyclability (3000 cycles at 1 A g-1 ), and coulombic efficiency (≈100 %) and fast charging (≈11 min). This performance was superior to the TiO2 -based Mg-Li dual-ion battery cathodes reported earlier. Mechanistic studies revealed dual-ion intercalation pseudocapacitance with negligible structural changes. Excellent electrochemical performance of the cation-doped TiO2 cathode was credited to the rapid pseudocapacitance-type Mg/Li-ion diffusion through the disorder generated by lattice distortions and oxygen vacancies. Ultrathin nature, large surface area, 2D morphology, and mesoporosity also contributed as secondary factors facilitating superior electrode-electrolyte interfacial kinetics. The demonstrated method of pseudocapacitance-type Mg-Li dual-ion intercalation by introducing lattice distortions/oxygen vacancies through selective doping can be utilized for the development of several other potential electrodes for high-performance Mg-Li dual-ion batteries.
Collapse
Affiliation(s)
- Mewin Vincent
- Electrochemistry Division, IMDEA Materials Institute, C/ Eric Kandel 2, Getafe, Madrid, 28906, Spain
- Faculty of Science, Autonomous University of Madrid, C/ Francisco Tomás y Valiente, 7, 28049, Madrid, Spain
| | - Venkata Sai Avvaru
- Electrochemistry Division, IMDEA Materials Institute, C/ Eric Kandel 2, Getafe, Madrid, 28906, Spain
- Faculty of Science, Autonomous University of Madrid, C/ Francisco Tomás y Valiente, 7, 28049, Madrid, Spain
| | - Maciej Haranczyk
- Computational Materials Discovery Division, IMDEA Materials Institute, C/ Eric Kandel 2, Getafe, 28906, Madrid, Spain
| | - Vinodkumar Etacheri
- Electrochemistry Division, IMDEA Materials Institute, C/ Eric Kandel 2, Getafe, Madrid, 28906, Spain
| |
Collapse
|
2
|
Lee MG, Yang JW, Kwon HR, Jang HW. Crystal facet and phase engineering for advanced water splitting. CrystEngComm 2022. [DOI: 10.1039/d2ce00585a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review covers the principles and recent advances in facet and phase engineering of catalysts for photocatalytic, photoelectrochemical, and electrochemical water splitting. It suggests the basis of catalyst design for advanced water splitting.
Collapse
Affiliation(s)
- Mi Gyoung Lee
- Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 1A4, Canada
| | - Jin Wook Yang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hee Ryeong Kwon
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ho Won Jang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
- Advanced Institute of Convergence Technology, Seoul National University, Suwon, 16229, Republic of Korea
| |
Collapse
|
3
|
Synthesis and Characterization of Sn/Ni Single Doped and Co–Doped Anatase/Rutile Mixed–Crystal Nanomaterials and Their Photocatalytic Performance under UV–Visible Light. Catalysts 2021. [DOI: 10.3390/catal11111341] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Pure and Sn/Ni co–doped TiO2 nanomaterials with anatase/rutile mixed crystal were prepared and characterized. The results show that pure TiO2 is a mixed crystal structure composed of a large amount of anatase and a small amount of rutile. Sn doping promotes the phase transformation from anatase to rutile, while Ni doping inhibits the transformation. Both single doping and co–doping are beneficial to the inhibition of photoinduced charge recombination. Sn doping shows the best inhibitory effect on photogenerated charge recombination, and increases the utilization of visible light, displaying the highest photocatalytic activity. The decolorization degree of methylene blue (MB) by Sn–TiO2 is 79.5% after 150 min. The reaction rate constant of Sn–TiO2 is 0.01022 min−1, which is 5.6 times higher than pure TiO2 (0.00181 min–1).
Collapse
|
4
|
Banerjee D, Dey CC, Kumar R, Sewak R, Jha SN, Bhattacharyya D, Acharya R, Pujari PK. Probing the solute-drag effect and its role in stabilizing the orthorhombic phase in bulk La-doped HfO 2 by X-ray and gamma ray spectroscopy. Phys Chem Chem Phys 2021; 23:16258-16267. [PMID: 34309608 DOI: 10.1039/d1cp00096a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The recent observation of ferroelectricity in ultra thin films of hafnium oxide (HfO2) has been attributed to the orthorhombic (o) phase of HfO2 with space group Pca21. Although this oxide is polymorphic in nature, this polar o-phase is known to be stabilized in the doped thin film oxide. The objective of the present experiment is to stabilize the o-phases in La doped bulk polycrystalline HfO2 and investigate their evolution with the doping concentration through Time Differential Perturbed Angular Correlation (TDPAC), X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) measurements. The present work reports the presence of both the polar Pca21 phase and the antipolar Pbca phase at different La-concentrations. Two o-phases of HfO2 with space groups Pca21 and Pbca, difficult to distinguish by other complimentary methods, could be unambiguously identified by utilizing the atomic scale sensitivity of the electric field gradient (EFG) embedded in TDPAC spectroscopy. The determination of the oxidation state and the local environment of La-atoms by XANES and EXAFS measurements illuminates the microscopic role of the dopant in stabilizing the o-phase. The "solute drag model" proposes a critical crystallite size for the nucleation of the o-phase in bulk HfO2 and explains the role of the La-dopant in stabilizing the o-phase. Thus the present study shows the possibility of stabilizing the polar o-phase and hence attaining ferroelectricity in bulk HfO2 to augment the scope of future application for this ferroelectric device.
Collapse
Affiliation(s)
- D Banerjee
- Radiochemistry Laboratory, RCD (BARC), Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064, India.
| | | | | | | | | | | | | | | |
Collapse
|