Cation-deficient TiO2(B) nanowires with protons charge compensation for regulating reversible magnesium storage

Luo, Lan; Zhou, Kaiqiang; Lian, Ruqian; Lu, Yanzhong; Zhen, Yang; Wang, Jinshan; Mathur, Sanjay; Hong, Zhensheng

doi:10.1016/j.nanoen.2020.104716

Cited by 31 publications

(30 citation statements)

References 40 publications

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“…[ 4,34,36 ] The bandgap of Ar‐350 is narrowed, resulting in a redshift of the absorption band edge. As an indirect bandgap semiconductor, [ 37 ] the optical bandgaps were obtained by Tauc‐plot fitting to the direct transition of αhv = A ( hv − E g ) 2 . Here α is the absorption coefficient, hv is the photoenergy, E g is the indirect bandgap, and A is a constant.…”

Section: Resultsmentioning

confidence: 99%

Amorphous Domains in Black Titanium Dioxide

et al. 2021

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Although oxygen vacancies (Ovs) play a critical role for many applications of metal oxides, a controllable synthetic strategy for anisotropic Ovs remains a great challenge. Here, a novel strategy is proposed to achieve the regional dual structure with anisotropic Ovs at both the surface and in the interior of TiO2 by constructing amorphous domains. The as‐prepared black TiO2 with amorphous domains exhibits superior activity in degrading rhodamine B (RhB) solutions, which can instantly decompose RhB with just a shake. First‐principle simulations reveal that subsurface Ovs in TiO2 are energetically favored, resulting in the formation of amorphous domains in the interior region via diffusion of surface‐formed Ovs into the subsurface. The stable Ov‐induced amorphous domains in TiO2 with enhanced catalytic performances provide a scalable strategy to practical Ov engineering in functional metal oxides.

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Section: Resultsmentioning

confidence: 99%

Amorphous Domains in Black Titanium Dioxide

et al. 2021

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“…Besides, an emerging peak located at 531.0 eV appears on M-TiO 2 while not on P25 in the O 1s spectra (Fig. 3d), which could be ascribed to OH group at Ti vacancy defect (Ti v -OH) 31 . These characterizations demonstrate that M-TiO 2 has abundant Ti and oxygen vacancy defects, which are supposed to be closely related to the catalytic performance.…”

Section: Catalyst Structure With Ti and Oxygen Vacancy Defects On M-tmentioning

confidence: 97%

Defect-rich TiO2 in situ evolved from MXene for efficiently oxidative dehydrogenation of ethane

Zhou¹,

Li²,

Chai³

et al. 2020

Preprint

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It remains a challenge to make metal oxides with limited reducibility as active component rather than support or modifier for the oxidative dehydrogenation (ODH) of light alkanes. Here, we report a special TiO2 (M-TiO2) evolved from Ti3C2Tx MXene material to be a new kind of efficient catalyst in the ODH of ethane. The reactivity on this M-TiO2 is four times higher than that on P25 TiO2, endowing an excellent ethylene productivity of 15.4 gC2H4 gcat-1 h-1 that outperforms the previously reported catalysts. Experimental characterizations and theoretical calculations reveal the existence of both Ti and oxygen vacancy defects on M-TiO2. The Ti defect can increase the reducibility of M-TiO2 to reduce the activation barrier of ethane while the oxygen vacancy facilitates the adsorption of O2 to recover lattice oxygen, accounting for the high performance. This work enlightens the defect engineering of traditional metal oxide as a promising catalyst in the oxidation catalysis.

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“…For cathode materials in Mg‐based batteries, almost each types has been widely reported including intercalation compounds, [ 9–15 ] conversion materials, [ 16–21 ] element redox chemistries, [ 22–28 ] water cointercalation materials, [ 29–31 ] as well as hybrid systems. [ 4–6,32–35 ] Among them, intercalation cathodes with unbroken structure during discharge/charge progresses present good cycling stability and become a hot spot in Mg‐based batteries, such as chevrel phase, [ 4,10 ] MoS 2 , [ 6,9 ] spinel Mn 2 O 4 , [ 11 ] TiO 2 , [ 12–14 ] TiS 2 , [ 15 ] Ti 2 S 4 , [ 36 ] VS 2 , [ 7 ] VS 4 , [ 37–39 ] V 2 O 5 , [ 29,40,41 ] polyanion, [ 42 ] etc. Whereas, they are seriously impeded by low theoretical specific capacity, and more efforts on seeking other high capacity conversion cathodes are still crucial issues.…”

Section: Introductionmentioning

confidence: 99%

“…It is worth mentioning that above electrolyte with the traits of low cost and high coulombic efficiency has been maturely applied in hybrid systems. [4][5][6][7][8][9] Nevertheless, for the sake of avoiding serious corrosion problems, appropriate cathodes with stable electrochemical window (≤2.1 V vs Mg/Mg 2+ ) and outstanding electrochemical performances also need to be further investigated.For cathode materials in Mg-based batteries, almost each types has been widely reported including intercalation compounds, [9][10][11][12][13][14][15] conversion materials, [16][17][18][19][20][21] element redox chemistries, [22][23][24][25][26][27][28] water cointercalation materials, [29][30][31] as well as hybrid systems. [4][5][6][32][33][34][35] Among them, intercalation cathodes with unbroken structure during discharge/charge progresses present good cycling stability and become a hot spot in Mg-based batteries, such as chevrel phase, [4,10] MoS 2 , [6,9] spinel Mn 2 O 4 , [11] TiO 2 , [12][13]…”

mentioning

confidence: 99%

“…For cathode materials in Mg-based batteries, almost each types has been widely reported including intercalation compounds, [9][10][11][12][13][14][15] conversion materials, [16][17][18][19][20][21] element redox chemistries, [22][23][24][25][26][27][28] water cointercalation materials, [29][30][31] as well as hybrid systems. [4][5][6][32][33][34][35] Among them, intercalation cathodes with unbroken structure during discharge/charge progresses present good cycling stability and become a hot spot in Mg-based batteries, such as chevrel phase, [4,10] MoS 2 , [6,9] spinel Mn 2 O 4 , [11] TiO 2 , [12][13][14] TiS 2 , [15] Ti 2 S 4 , [36] VS 2 , [7] VS 4 , [37][38][39] V 2 O 5 , [29,40,41] polyanion,…”

mentioning

confidence: 99%

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Hierarchical 3D Cuprous Sulfide Nanoporous Cluster Arrays Self‐Assembled on Copper Foam as a Binder‐Free Cathode for Hybrid Magnesium‐Based Batteries

Zhu

Xia

2021

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On account of easy accessibility, high theoretical volumetric capacity and dendrite‐free magnesium (Mg) anode, Mg battery has a great promise to be next generation rechargeable batteries, yet still remains a challenging task in acquiring fast Mg2+ kinetics and effective cathode materials. Herein, hierarchical 3D cuprous sulfide porous nanosheet decorated nanowire cluster arrays with robust adhesion on copper foam (Cu2S HP/CF), which is employed as a binder‐free conversion cathode material for magnesium/lithium hybrid battery, delivering impressively initial and reversible specific capacity of 383 and 311 mAh g−1 at 100 mA g−1, respectively, which are obviously outperformed corresponding powder cathode in a traditional method by using polymer binder, is reported. Intriguingly, benefiting from the hierarchical nanoporous array architecture and self‐assembly feature, Cu2S HP/CF cathode shows a remarkable cycling stability with a high capacity of 129 mAh g−1 at 300 mA g−1 over 500 cycles. This work not only highlights a guide for designing hierarchical nanoporous materials derived from metal–organic frameworks, but also provides a novel strategy of in situ formation to fabricate binder‐free cathodes.

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Cation-deficient TiO2(B) nanowires with protons charge compensation for regulating reversible magnesium storage

Cited by 31 publications

References 40 publications

Amorphous Domains in Black Titanium Dioxide

Amorphous Domains in Black Titanium Dioxide

Defect-rich TiO2 in situ evolved from MXene for efficiently oxidative dehydrogenation of ethane

Hierarchical 3D Cuprous Sulfide Nanoporous Cluster Arrays Self‐Assembled on Copper Foam as a Binder‐Free Cathode for Hybrid Magnesium‐Based Batteries

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