1
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Wang T, Qin Y, Hu R, Wei Z, Yang Y. Anchoring tungsten oxide nanorods on TiO 2 nanowires coupled with carbon for efficient lithium-ion storage. Dalton Trans 2023; 52:17299-17307. [PMID: 37937439 DOI: 10.1039/d3dt03102k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
Reasonable construction of hierarchical electrode materials is verified as a promising way to improve the electrochemical performance due to the synergistic effect between unique components and constructions. Hence, a hierarchical nanostructure composed of tungsten oxide nanorods anchored on TiO2 nanowires coupled with a carbon layer (TiO2@WOx-C NWs) was synthesized as an electrode material by exploiting the self-assembly function of dopamine and carbonization. The inner one-dimensional TiO2 nanowires served as the stable substrate with WOx anchored on the surface of TiO2 NWs and the tightly coupled carbon nanosheets, which can not only facilitate electron transport but also provide more active sites for electrochemical reactions. As a result, benefitting from the synergistic effects between three functional components and the multi-dimensional hierarchical structures, the as-prepared TiO2@WOx-C NWs displayed excellent lithium storage performance with a specific capacity of 651.4 mA h g-1 after 500 cycles at 1.0 A g-1, which is superior to most Ti-based structures. The enhanced electrochemical performance is mainly attributed to the synergistic effect of the different dimensional structures, the high capacity of tungsten oxide and the surface coating of the conductive carbon material. This work provides a simple and effective approach to designing functional hierarchical structures for energy storage and conversion.
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Affiliation(s)
- Teng Wang
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China.
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, Guangdong, 518057, P. R. China
| | - Yifan Qin
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China.
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, Guangdong, 518057, P. R. China
| | - Renquan Hu
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China.
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, Guangdong, 518057, P. R. China
| | - Zehui Wei
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China.
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, Guangdong, 518057, P. R. China
| | - Yong Yang
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China.
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, Guangdong, 518057, P. R. China
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2
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Khaja Hussain S, Bang JH. Overview of the oxygen vacancy effect in bimetallic spinel and perovskite oxide electrode materials for high-performance supercapacitors. Phys Chem Chem Phys 2023; 25:11892-11907. [PMID: 37097013 DOI: 10.1039/d3cp00472d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
Abstract
Bimetallic spinel and perovskite metal oxide materials are advanced electrode materials for supercapacitor (SC) applications because of their low-cost, distinct crystal structures, eco-friendly nature, and high conductivity. However, they suffer from the disadvantages of poor ion-diffusion kinetics and pulverization issues during cyclability tests. Along with a deeper understanding of redox chemistry, the role of oxygen vacancies (OVs) in electrode materials to support the reaction kinetics for excellence in SCs must be clarified. In this review, we highlight for the first time the importance of OVs and summarize various design strategies for the preparation of advanced bimetallic spinel oxides and perovskites with improved electrochemical performances for SC applications. With new insights, we envision that the SC research community would endeavor to utilize the benefits of OVs effectively for the development of high-performance SCs.
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Affiliation(s)
- Sk Khaja Hussain
- Nanosensor Research Institute, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea.
| | - Jin Ho Bang
- Nanosensor Research Institute, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea.
- Department of Chemical and Molecular Engineering, Hanyang University, Ansan, Gyeonggi-do 15588, Republic of Korea
- Department of Applied Chemistry, Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, Gyeonggi-do 15588, Republic of Korea
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3
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Cheng YT, Xia Q, Liu H, Solomon MB, Brisson ERL, Blackman LD, Ling CD, Müllner M. Tunable Polymer Nanoreactors from RAFT Polymerization-Induced Self-Assembly: Fabrication of Nanostructured Carbon-Coated Anatase as Battery Anode Materials with Variable Morphology and Porosity. ACS APPLIED MATERIALS & INTERFACES 2023; 15:12261-12272. [PMID: 36821625 DOI: 10.1021/acsami.2c18928] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
We demonstrate a modular synthesis approach to yield mesoporous carbon-coated anatase (denoted as TiO2/C) nanostructures. Combining polymerization-induced self-assembly (PISA) and reversible addition-fragmentation chain-transfer (RAFT) dispersion polymerization enabled the fabrication of uniform core-shell polymeric nanoreactors with tunable morphologies. The nanoreactors comprised of a poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) shell and a poly(benzyl methacrylate) (PBzMA) core. We selected worm-like and vesicular morphologies to guide the nanostructuring of a TiO2 precursor, namely, titanium(IV) bis(ammonium lactato)dihydroxide (TALH). Subsequent carbonization yielded nanocrystalline anatase and simultaneously introduced a porous carbon framework, which also suppressed the crystal growth (∼5 nm crystallites). The as-prepared TiO2/C materials comprised of a porous structure, with large specific surface areas (>85 m2/g) and various carbon contents (20-30 wt %). As anode components in lithium-ion batteries, our TiO2/C nanomaterials improved the cycling stability, facilitated high overall capacities, and minimized the capacity loss compared to both their sans carbon and commercial anatase analogues.
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Affiliation(s)
- Yen Theng Cheng
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
- The University of Sydney Nano Institute (Sydney Nano), Sydney, NSW 2006, Australia
| | - Qingbo Xia
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
- The University of Sydney Nano Institute (Sydney Nano), Sydney, NSW 2006, Australia
| | - Hongwei Liu
- Sydney Microscopy & Microanalysis, The University of Sydney node of Microscopy Australia, Sydney, NSW 2006, Australia
| | - Marcello B Solomon
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Emma R L Brisson
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Lewis D Blackman
- CSIRO Manufacturing Business Unit, Research Way, Clayton, VIC 3168, Australia
| | - Chris D Ling
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
- The University of Sydney Nano Institute (Sydney Nano), Sydney, NSW 2006, Australia
| | - Markus Müllner
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
- The University of Sydney Nano Institute (Sydney Nano), Sydney, NSW 2006, Australia
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4
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Sun S, Wang C, Wang QC, Liu Y, Xie Q, Zeng Z, Li X, Han J, Guo R. Three-in-one oxygen-deficient titanium dioxide in a pomegranate-inspired design for improved lithium storage. J Colloid Interface Sci 2023; 633:546-554. [PMID: 36470135 DOI: 10.1016/j.jcis.2022.11.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 11/16/2022] [Accepted: 11/19/2022] [Indexed: 11/25/2022]
Abstract
Defects engineering has played an ever-increasing important role in electrochemistry, especially secondary lithium batteries. TiO2 is regarded as a promising anode due to its attractive cycling stability, low volume strain and great abundance, while challenges of intrinsic poor electrical and ionic conductivity remain to be addressed. Herein, we report a three-in-one oxygen vacancy (VO)-involved pomegranate design for TiO2-x/C composite anode, which provides highly improved electrical conduction, shortened Li+ pathway and promoted Li+ redox. N-doped mesoporous carbon acts as a robust scaffold to support the whole structure, electron highway and efficient reductant to generate VO on TiO2 nanoparticles during crystallization. Theoretical calculations reveal the crucial role of surface VO on TiO2 in Li electrochemistry. Resultantly, the optimal TiO2-x/C anode achieves significantly enhanced cycling performance (203 mAh/g retained after 2000 cycles at 1 A/g). Postmortem analysis reveals the robustness of VO and reasonable structure stability upon cycles for improved battery performance.
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Affiliation(s)
- Siwei Sun
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Chao Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | - Qin-Chao Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | - Yingwei Liu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Qihong Xie
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Zhiyong Zeng
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Xiaoge Li
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Jie Han
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | - Rong Guo
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
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5
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Tetteh EB, Valavanis D, Daviddi E, Xu X, Santana Santos C, Ventosa E, Martín-Yerga D, Schuhmann W, Unwin PR. Fast Li-ion Storage and Dynamics in TiO 2 Nanoparticle Clusters Probed by Smart Scanning Electrochemical Cell Microscopy. Angew Chem Int Ed Engl 2023; 62:e202214493. [PMID: 36469735 DOI: 10.1002/anie.202214493] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 12/02/2022] [Accepted: 12/05/2022] [Indexed: 12/12/2022]
Abstract
Anatase TiO2 is a promising material for Li-ion (Li+ ) batteries with fast charging capability. However, Li+ (de)intercalation dynamics in TiO2 remain elusive and reported diffusivities span many orders of magnitude. Here, we develop a smart protocol for scanning electrochemical cell microscopy (SECCM) with in situ optical microscopy (OM) to enable the high-throughput charge/discharge analysis of single TiO2 nanoparticle clusters. Directly probing active nanoparticles revealed that TiO2 with a size of ≈50 nm can store over 30 % of the theoretical capacity at an extremely fast charge/discharge rate of ≈100 C. This finding of fast Li+ storage in TiO2 particles strengthens its potential for fast-charging batteries. More generally, smart SECCM-OM should find wide applications for high-throughput electrochemical screening of nanostructured materials.
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Affiliation(s)
- Emmanuel Batsa Tetteh
- Department of Chemistry, University of Warwick, Coventry, CV47AL, UK.,Analytical Chemistry-, Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstr. 150, 44780, Bochum, Germany
| | | | - Enrico Daviddi
- Department of Chemistry, University of Warwick, Coventry, CV47AL, UK
| | - Xiangdong Xu
- Department of Chemistry, University of Warwick, Coventry, CV47AL, UK
| | - Carla Santana Santos
- Analytical Chemistry-, Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstr. 150, 44780, Bochum, Germany
| | - Edgar Ventosa
- Department of Chemistry, University of Burgos, Pza. Misael Bañuelos s/n, 09001, Burgos, Spain
| | | | - Wolfgang Schuhmann
- Analytical Chemistry-, Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstr. 150, 44780, Bochum, Germany
| | - Patrick R Unwin
- Department of Chemistry, University of Warwick, Coventry, CV47AL, UK
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6
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Qin Y, Zhao Z, Wang T, Li S, Yan M, Hao C, Bao X, He S, Zhang M, Yang Y. Efficient Lithium/Sodium-Ion Storage by Core-Shell Carbon Nanospheres@TiO 2 Decorate by Epitaxial WSe 2 Nanosheets Derived from Bimetallic Polydopamine Composites. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2204980. [PMID: 36399636 DOI: 10.1002/smll.202204980] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 10/19/2022] [Indexed: 06/16/2023]
Abstract
Metal-polydopamine coordination chemistry attracts great attention owing to the synergistic effect of adjustable components and advantageous structures. However, few efforts have been devoted to exploring bimetal-polydopamine composites, especially for multistructural composites with high-capacity components and high stability. In this regard, the TiO2 @C-WSe2 core-shell nanospheres are designed and fabricated based on Ti-W-polydopamine composites after selenization, in which the TiO2 nanoparticles are encapsulated or embedded in the carbon nanospheres and the external WSe2 nanosheets are grown epitaxially on the carbon surfaces, featuring multiple channels for ion diffusion and abundant active edges for electrochemical reactions. The introduction of WSe2 not only greatly improves the capacity but also results in exponential growth of the active edge. As a result, the as-prepared TiO2 @C-WSe2 displayed long-term cycling performance in lithium-ion batteries. Furthermore, the anode is assembled into sodium-ion batteries, manifesting a stable capacity of 352 mA h g-1 at 1.0 A g-1 even after 2000 cycles, one of the best performances for polydopamine-based composites. Enhanced performance can be attributed to the synergies of high-capacity components and different dimensional materials. This work highlights that the rational design of functional structures provides a novel inspiration for electrodes with effective nanoarchitectures.
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Affiliation(s)
- Yifan Qin
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Zejun Zhao
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Teng Wang
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Sijia Li
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Meng Yan
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Chentao Hao
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Xiaobing Bao
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
| | - Shengnan He
- Institute of Science and Technology for New Energy, Xi'an Technological University, Xi'an, 710021, P. R. China
| | - Mingchang Zhang
- Institute of Science and Technology for New Energy, Xi'an Technological University, Xi'an, 710021, P. R. China
| | - Yong Yang
- State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an, Shaanxi, 710072, P. R. China
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7
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Polypyrrole Film Deposited-TiO2 Nanorod Arrays for High Performance Ultraviolet Photodetectors. CHEMOSENSORS 2022. [DOI: 10.3390/chemosensors10070277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
TiO2-based ultraviolet photodetectors have drawn great attention and are intensively explored. However, the construction of TiO2-based nanocomposites with excellent ultraviolet responses remains challenging. Herein, a TiO2 nanorod array was successfully prepared on fluorine-doped tin oxide (FTO) conductive glass by a one-step hydrothermal method. Then, polypyrrole (PPy)-TiO2 nanorod array composites were designed via subsequent in situ oxidative polymerization. The morphologies, structures, and photocurrent responses of the nanocomposites were systematically investigated. The results demonstrated that polypyrrole-TiO2 exhibited a stronger photocurrent response than pure TiO2 due to the p-n junction formed between n-type TiO2 nanorod arrays and p-type polypyrrole. The PPy-TiO2 composite obtained by deposition three times had the best photoelectric properties, exhibiting good performance with a sensitivity of 41.7 and responsivity of 3.5 × 10−3 A/W. Finally, the mechanism of the photoelectrical response of PPy-TiO2 composites was discussed, guiding the design of high-performance TiO2-based ultraviolet photodetectors.
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8
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Chung W, Bang JH. Carbon-Doped TiNb 2O 7 Suppresses Amorphization-Induced Capacity Fading. ACS APPLIED MATERIALS & INTERFACES 2022; 14:19365-19375. [PMID: 35465658 DOI: 10.1021/acsami.2c00589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The limited capacity of graphite anodes in high-performance batteries has led to considerable interest in alternative materials in recent years. Due to its high capacity, titanium niobium oxide (TiNb2O7, TNO) with a Wadsley-Roth crystallographic sheared structure holds great promise as a next-generation anode material, but a comprehensive understanding of TNO's electrochemical behavior is lacking. In particular, the mechanism responsible for the capacity fading of TNO remains poorly elucidated. Given its metastable nature (as an entropy-stabilized oxide) and the large volume change in TNO upon lithiation and delithiation, which has long been overlooked, the factors governing capacity fading warrant investigation. Our studies reveal that the structural weakness of TNO is fatal to the long-term cycling stability of TNO and that the capacity fading of TNO is driven by amorphization, which results in a significant increase in impedance. While nanostructuring can kinetically boost lithium intercalation, this benefit comes at the expense of capacity fading. Carbon doping in TNO can effectively suppress the critical impedance increase despite the amorphization, providing a possible remedy to the stability issue.
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Affiliation(s)
- Woowon Chung
- Department of Bionano Technology, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
| | - Jin Ho Bang
- Department of Chemical and Molecular Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
- Department of Applied Chemistry, Center for Bionano Intelligence Education and Research, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea
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9
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Lee MD, Lee GJ, Nam I, Abbas MA, Bang JH. Exploring the Effect of Cation Vacancies in TiO 2: Lithiation Behavior of n-Type and p-Type TiO 2. ACS APPLIED MATERIALS & INTERFACES 2022; 14:6560-6569. [PMID: 35089708 DOI: 10.1021/acsami.1c20265] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
TiO2 offers several advantages over graphite as an anode material for Li-ion batteries (LIBs) but suffers from low electrical conductivity and Li-diffusion issues. Control over defect chemistry has proven to be an effective strategy to overcome these issues. However, defect engineering has primarily been focused on oxygen vacancies (VO). The role of another intrinsic TiO2 vacancy [i.e., titanium vacancies (VTi)] with regard to the Li+ storage behavior of TiO2 has largely evaded attention. Hence, a comparison of VO- and VTi-defective TiO2 can provide valuable insight into how these two types of defects affect Li+ storage behavior. To eliminate other factors that may also affect the Li+ storage behavior of TiO2, we carefully devised synthesis protocols to prepare TiO2 with either VO (n-TiO2) or VTi (p-TiO2). Both TiO2 materials were verified to have a very similar morphology, surface area, and crystal structure. Although VO provided additional sites that improved the capacity at low C-rates, the benefit obtained from over-lithiation turned out to be detrimental to cycling stability. Unlike VO, VTi could not serve as an additional lithium reservoir but could significantly improve the rate performance of TiO2. More importantly, the presence of VTi prevented over-lithiation, significantly improving the cycling stability of TiO2. We believe that these new insights could help guide the development of high-performance TiO2 for LIB applications.
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Affiliation(s)
- Moo Dong Lee
- Department of Bionano Technology, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, Gyeonggi-do, Republic of Korea
| | - Geun Jun Lee
- Department of Bionano Technology, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, Gyeonggi-do, Republic of Korea
| | - Inho Nam
- School of Chemical Engineering and Materials Science, Department of Intelligent Energy and Industry, Institute of Energy Converting Soft Materials, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Muhammad A Abbas
- Nanosensor Research Institute, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, Gyeonggi-do, Republic of Korea
| | - Jin Ho Bang
- Nanosensor Research Institute, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, Gyeonggi-do, Republic of Korea
- Department of Chemical and Molecular Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, Gyeonggi-do, Republic of Korea
- Department of Applied Chemistry, Center for Bionano Intelligence Education and Research, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, Gyeonggi-do, Republic of Korea
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10
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Lu X, Xu J, Wang Y, Xue Y, Li J, Hu X, Yang Z. Nitrogen‐doped TiO
2
Nanocrystals for Highly Sensitive Electrochemical Immunoassay of Carcinoembryonic Antigen. ELECTROANAL 2021. [DOI: 10.1002/elan.202100216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xin Lu
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 PR China
| | - Jia Xu
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 PR China
| | - Yulin Wang
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 PR China
| | - Yadong Xue
- Central Laboratory, Affiliated Jinhua Hospital Zhejiang University School of Medicine Jinhua 321000 China
| | - Juan Li
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 PR China
| | - Xiaoya Hu
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 PR China
| | - Zhanjun Yang
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 PR China
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11
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Microwave-assisted synthesis of hierarchically porous Co 3O 4/rGO nanocomposite for low-temperature acetone detection. J Colloid Interface Sci 2021; 594:690-701. [PMID: 33780772 DOI: 10.1016/j.jcis.2021.03.041] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 03/03/2021] [Accepted: 03/08/2021] [Indexed: 11/23/2022]
Abstract
Acetone sensors with high response and excellent selectivity are of enormous demand for monitoring the diabetes. This paper has reported a novel porous 3D hierarchical Co3O4/rGO nanocomposite synthesized by a microwave-assisted method, by which Co3O4 nanoparticles are rapidly and uniformly anchored on rGO nanosheets. The phase composition, surface morphology of the Co3O4/rGO composites and the effect of rGO on their acetone-sensing performance were systematically investigated. The results show that the sample with an optimized content of rGO (Co3O4/rGO-1) achieves the highest stability and response to acetone (0.5 ~ 200 ppm) at a relatively low temperature (~160 °C). Also, the Co3O4/rGO-1 exhibits a high acetone-sensing selectivity against the gases (or vapors) of H2S, H2, CH4, HCHO, CH3OH, C3H8O and C2H5OH. The enhanced acetone-sensing performance of the Co3O4/rGO composite can be attributed to the Co3O4/rGO p-p heterojunction and the Co3+-C coupling effect between Co3O4 and rGO, improving transport of carriers. In addition, the unique 3D hierarchically porous structure and large surface areas are favorable to adsorption and desorption of gas molecules. This facile microwave-assisted method provides a charming strategy to develop smart rGO-based nanomaterials for real-time detection of harmful gases and rapid medical diagnosis.
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12
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Dahlman CJ, Heo S, Zhang Y, Reimnitz LC, He D, Tang M, Milliron DJ. Dynamics of Lithium Insertion in Electrochromic Titanium Dioxide Nanocrystal Ensembles. J Am Chem Soc 2021; 143:8278-8294. [PMID: 33999619 DOI: 10.1021/jacs.0c10628] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nanocrystalline anatase TiO2 is a robust model anode for Li insertion in batteries. The influence of nanocrystal size on the equilibrium potential and kinetics of Li insertion is investigated with in operando spectroelectrochemistry of thin film electrodes. Distinct visible and infrared responses correlate with Li insertion and electron accumulation, respectively, and these optical signals are used to deconvolute bulk Li insertion from other electrochemical responses, such as double-layer capacitance, pseudocapacitance, and electrolyte leakage. Electrochemical titration and phase-field simulations reveal that a difference in surface energies between anatase and lithiated phases of TiO2 systematically tunes the Li-insertion potentials with the particle size. However, the particle size does not affect the kinetics of Li insertion in ensemble electrodes. Rather, the Li-insertion rates depend on the applied overpotential, electrolyte concentration, and initial state of charge. We conclude that Li diffusivity and phase propagation are not rate limiting during Li insertion in TiO2 nanocrystals. Both of these processes occur rapidly once the transformation between the low-Li anatase and high-Li orthorhombic phases begins in a particle. Instead, discontinuous kinetics of Li accumulation in TiO2 particles prior to the phase transformations limits (dis)charging rates. We demonstrate a practical means to deconvolute the nonequilibrium charging behavior in nanocrystalline electrodes through a combination of colloidal synthesis, phase field simulations, and spectroelectrochemistry.
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Affiliation(s)
- Clayton J Dahlman
- Materials Department, University of California, Santa Barbara, California 93106, United States.,McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Sungyeon Heo
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Youtian Zhang
- Department of Materials Science and Nanoengineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Lauren C Reimnitz
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Daniel He
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Ming Tang
- Department of Materials Science and Nanoengineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Delia J Milliron
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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Balapure A, Ganesan R. Anatase versus Triphasic TiO 2: Near-identical synthesis and comparative structure-sensitive photocatalytic degradation of methylene blue and 4-chlorophenol. J Colloid Interface Sci 2021; 581:205-217. [PMID: 32771732 DOI: 10.1016/j.jcis.2020.07.096] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/12/2020] [Accepted: 07/19/2020] [Indexed: 01/17/2023]
Abstract
Studies on photocatalytic activity of monophasic and biphasic TiO2 have been well explored. However, detailed studies on the photocatalytic activity of triphasic titania, as opposed to monophasic or biphasic TiO2 are scarce. Here we report a comparative structure-sensitive photocatalytic study of triphasic versus anatase TiO2, both have been synthesized under near-identical conditions through a customized sol-gel approach. The composition of the phases is tuned just by varying the thermal pre-treatment conditions of TiO2 gel that has been subsequently subjected to calcination at 300 °C. Interestingly, when the pre-treatment temperature of the gel is systematically increased from 50 to 250 °C, a transition from anatase to triphasic (anatase, rutile, and brookite) and then again to anatase has been observed. The synthesized TiO2 phase compositions have been thoroughly characterized for their structural, optical, electrical, surface and morphological properties. Among the different phase compositions, triphasic titania having a significant proportion of rutile has been found to exhibit the highest photocatalytic activity, as probed using model organic pollutants, Methylene Blue (MB) and 4-Chlorophenol (4-CP). In addition to the earlier known factors such as effective heterojunction, and favorable position of the valence band (VB), an important contribution to the high photocatalytic activity of triphasic TiO2 has been experimentally found to stem from the additional electron density in VB that is attributed to the lattice contraction of anatase phase owing to the coexistence of other two phases. The study provides fundamental insights into the energetics that impact the photocatalytic activity of triphasic versus anatase TiO2.
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Affiliation(s)
- Aniket Balapure
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India
| | - Ramakrishnan Ganesan
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India.
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14
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Teng XL, Sun XT, Guan L, Hu H, Wu MB. Self-supported transition metal oxide electrodes for electrochemical energy storage. ACTA ACUST UNITED AC 2020. [DOI: 10.1007/s42864-020-00068-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Carbon-coated porous TiO2 layers templated by core-shell polymer particles: Film processing and charge transfer resistance assessment. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.125390] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Chen Q, Yuan YF, Yin SM, Zhu M, Cai GS. Pomegranate-like C@TiO 2 mesoporous honeycomb spheres for high performance lithium ion batteries. NANOTECHNOLOGY 2020; 31:435410. [PMID: 32629434 DOI: 10.1088/1361-6528/aba302] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Pomegranate-like C@TiO2 mesoporous honeycomb spheres have been synthesized through two simple steps: formation of TiO2 mesoporous honeycomb spheres and the coating of polypyrrole followed by carbonization. TiO2 mesoporous honeycomb spheres are of large specific surface area of 153 m2 g-1 and contain abundant mesopores, which leads to high electrochemical activity and good kinetic performance of TiO2. A layer of amorphous carbon shell with the thickness of 30-40 nm tightly encapsulates a TiO2 mesoporous honeycomb sphere, forming a novel pomegranate-like small sphere, which significantly improves electronic conductivity and structural stability of TiO2. Benefiting from the unique pomegranate-like structure, C@TiO2 mesoporous honeycomb spheres exhibit high specific capacity, stable long-term cycling performance and good rate capability as an anode material for lithium ion batteries (LIBs). After 500 cycles at 1 C, the discharge capacity still reaches 184 mAh g-1. The electrochemical performance is superior to pure TiO2 mesoporous honeycomb spheres and most of the reported high-performance TiO2-based composites. This work provides a new high-performance TiO2-carbon-based composite material for LIBs as well as a new valuable research strategy.
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Affiliation(s)
- Q Chen
- College of Machinery and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
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17
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Wu J, Zhang P, Liu J, Zhou C, Guo S, Li S, Lei Y, Li K, Chen L. Controlled synthesis of N-doped carbon and TiO 2 double-shelled nanospheres with encapsulated multi-layered MoO 3 nanosheets as an anode for reversible lithium storage. Dalton Trans 2020; 49:10928-10938. [PMID: 32720939 DOI: 10.1039/c9dt04877d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
α-Phase molybdenum trioxide (α-MoO3) is one of the promising anode materials for lithium storage due to its high theoretical capacity and unique intercalation reaction mechanism. Herein, through an efficient step-by-step solvothermal synthesis strategy, multi-layered MoO3 nanosheets are encapsulated by nitrogen-doped carbon (NC) and ultrathin TiO2 double-shells to obtain hierarchical core-shell nanospheres (MoO3@TiO2@NC). The unique nanostructure enables shortening the Li+ diffusion distance, buffer the volume change during the intercalation/deintercalation process, and increase the active sites for the electrochemical reaction. Based on the hierarchical nanostructure and the synergistic effect of each component, the MoO3@TiO2@NC electrode exhibits a high Li+ storage capacity around 979.6 mA h g-1 after 200 cycles at 0.2 A g-1, a stable cycle performance of 800.3 mA h g-1 at 1 A g-1 after 700 cycles and an excellent rate capability of 418.0 mA h g-1 at 5 A g-1. Furthermore, the MoO3@TiO2@NC-based coin-type full cell with a commercial LiNi1/3Mn1/3Co1/3O2 cathode exhibited a good cycling stability at 0.2 A g-1 for 100 cycles (∼190 mA h g-1) and rate capability (134 mA h g-1 at 5 A g-1).
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Affiliation(s)
- Jing Wu
- Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
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18
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Jiang K, Niu Y, Fang D, Zhang L, Wang C. Sulfur Incorporation in Hierarchical TiO
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Nanosheet/Carbon Nanotube Hybrids for Improved Lithium Storage Performance. ChemElectroChem 2020. [DOI: 10.1002/celc.202000714] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Keliang Jiang
- Institute for New Energy Materials and Low-Carbon Technologies, School of Material Science and EngineeringTianjin University of Technology Tianjin 300384 People's Republic of China
| | - Yongjian Niu
- Institute for New Energy Materials and Low-Carbon Technologies, School of Material Science and EngineeringTianjin University of Technology Tianjin 300384 People's Republic of China
| | - Dong Fang
- Institute for New Energy Materials and Low-Carbon Technologies, School of Material Science and EngineeringTianjin University of Technology Tianjin 300384 People's Republic of China
| | - Linlin Zhang
- Institute for New Energy Materials and Low-Carbon Technologies, School of Material Science and EngineeringTianjin University of Technology Tianjin 300384 People's Republic of China
| | - Cheng Wang
- Institute for New Energy Materials and Low-Carbon Technologies, School of Material Science and EngineeringTianjin University of Technology Tianjin 300384 People's Republic of China
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19
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Lee GJ, Abbas MA, Lee MD, Lee J, Lee J, Bang JH. Lithiation Mechanism Change Driven by Thermally Induced Grain Fining and Its Impact on the Performance of LiMn 2 O 4 in Lithium-Ion Batteries. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2002292. [PMID: 32558381 DOI: 10.1002/smll.202002292] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/11/2020] [Indexed: 06/11/2023]
Abstract
The nature of precursors employed in the synthesis of lithium-ion battery cathode materials is a crucial performance-dictating factor. Therefore, it is of great importance to establish a way to manipulate the precursor and seek a comprehensive understanding of its influence on the electrochemical behavior of a targeted electrode material. A thermal route is herein demonstrated for the synthesis of lithium-excess LiMn2 O4 (LMO) by exploiting an intriguing thermal phenomenon, thermally induced grain fining, and sheds light on how it affects the mechanism and kinetics of lithiation, and, furthermore, the electrochemical behavior of LMO. Detailed insights into the lithiation mechanism and kinetics reveal that the use of a finely grained, porous Mn3 O4 , which possesses an open crystal structure, is a key to the success of incorporating excess Li. In addition, this in-depth electrochemical investigation verifies a very recent theoretical prediction of faster Li diffusion kinetics enabled by excess Li.
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Affiliation(s)
- Geun Jun Lee
- Department of Bionano Technology, Hanyang University, Ansan, Gyeonggi-do, 15588, Republic of Korea
| | - Muhammad A Abbas
- Nanosensor Research Institute, Hanyang University, Ansan, Gyeonggi-do, 15588, Republic of Korea
| | - Moo Dong Lee
- Department of Bionano Technology, Hanyang University, Ansan, Gyeonggi-do, 15588, Republic of Korea
| | - Jeongmin Lee
- Department of Bionano Technology, Hanyang University, Ansan, Gyeonggi-do, 15588, Republic of Korea
| | - Junghyun Lee
- Department of Bionano Technology, Hanyang University, Ansan, Gyeonggi-do, 15588, Republic of Korea
| | - Jin Ho Bang
- Department of Bionano Technology, Hanyang University, Ansan, Gyeonggi-do, 15588, Republic of Korea
- Nanosensor Research Institute, Hanyang University, Ansan, Gyeonggi-do, 15588, Republic of Korea
- Department of Chemical and Molecular Engineering and Department of Applied Chemistry, Hanyang University, Ansan, Gyeonggi-do, 15588, Republic of Korea
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Li Z, Dong Y, Feng J, Xu T, Ren H, Gao C, Li Y, Cheng M, Wu W, Wu M. Controllably Enriched Oxygen Vacancies through Polymer Assistance in Titanium Pyrophosphate as a Super Anode for Na/K-Ion Batteries. ACS NANO 2019; 13:9227-9236. [PMID: 31390521 DOI: 10.1021/acsnano.9b03686] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Although sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) are promising prospects for next-generation energy storage devices, their low capacities and inferior kinetics hinder their further application. Among various phosphate-based polyanion materials, titanium pyrophosphate (TiP2O7) possesses outstanding ion transferability and electrochemical stability. However, it has rarely been adopted as an anode for SIBs/PIBs due to its poor electronic conductivity and nonreversible phase transitions. Herein, an ultrastable TiP2O7 with enriched oxygen vacancies is prepared as a SIB/PIB anode through P-containing polymer mediation carbonization, which avoids harsh reduction atmospheres or expensive facilities. The introduction of oxygen vacancies effectively increases the pseudocapacitance and diffusivity coefficient and lowers the Na insertion energy barrier. As a result, the TiP2O7 anode with enriched oxygen vacancies exhibits ultrastable Na/K ion storage and superior rate capability. The synthetic protocol proposed here may offer a simple pathway to explore advanced oxygen vacancy-type anode materials for SIBs/PIBs.
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Affiliation(s)
- Zhongtao Li
- State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering , China University of Petroleum (East China) , Qingdao 266580 , China
| | - Yunfa Dong
- State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering , China University of Petroleum (East China) , Qingdao 266580 , China
| | - Jianze Feng
- State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering , China University of Petroleum (East China) , Qingdao 266580 , China
| | - Tao Xu
- State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering , China University of Petroleum (East China) , Qingdao 266580 , China
| | - Hao Ren
- State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering , China University of Petroleum (East China) , Qingdao 266580 , China
| | - Cai Gao
- State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering , China University of Petroleum (East China) , Qingdao 266580 , China
| | - Yueran Li
- State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering , China University of Petroleum (East China) , Qingdao 266580 , China
| | - Mingjie Cheng
- State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering , China University of Petroleum (East China) , Qingdao 266580 , China
| | - Wenting Wu
- State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering , China University of Petroleum (East China) , Qingdao 266580 , China
| | - Mingbo Wu
- State Key Laboratory of Heavy Oil Processing, Institute of New Energy, College of Chemical Engineering , China University of Petroleum (East China) , Qingdao 266580 , China
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