Li-intercalation boosted oxygen vacancies enable efficient electrochemical nitrogen reduction on ultrathin TiO2 nanosheets

Zhao, Renna; Wang, Guangbin; Mao, Yuyin; Bao, Xiaolei; Wang, Zeyan; Wang, Peng; Liu, Yuanyuan; Zheng, Zhaoke; Dai, Ying; Cheng, Hefeng; Huang, Baibiao

doi:10.1016/j.cej.2021.133085

Cited by 39 publications

(15 citation statements)

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“…The O 1 s spectrum in Figure 3d is deconvoluted into three peaks centered at about 529.8, 530.33, and 531.3 eV, which attributes to lattice oxygen (Ti–O), bridged hydroxyl group, and physically adsorbed water, respectively. [ 43 ] These surface‐bridged hydroxyl groups and physically adsorbed water are usually closely related to the surface oxygen vacancy. The Ti 2 p spectrum in Figure 3e, two convoluted peaks at 458.6 and 464.4 eV correspond to Ti 4+ 2 p 3/2 and Ti 4+ 2 p 1/2 , respectively, whereas the convoluted peaks at 459 and 462 eV correspond to Ti 3+ 2 p 3/2 and Ti 3+ 2 p 1/2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures

Cheng

Wang

et al. 2023

Adv Energy and Sustain Res

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TiO2–based photocatalysis system for splitting water into hydrogen offers a sustainable and green technology to produce clean hydrogen energy. However, pristine TiO2 still exists inherent shortcomings restricting its practical applications. Herein, the impact of postprocessing approaches of protonic titanate on engineering of oxygen vacancy and photocatalytic hydrogen evolution of TiO2−x is studied. Subsequently, interfacial cocatalysts are successfully involved in the optimized TiO2−x for enhanced photocatalytic hydrogen evolution. TiO2−x with the highest photocatalytic hydrogen evolution performance of 3112.09 μmol g−1 h−1, denoted as TiO2–C, is selected to adjust the interface with Cu and MoS2 respectively. Cu–TiO2–C and MoS2–TiO2–C composites are synthesized to enhance the separation ability of photogenerated electron‐hole pairs and significantly improve the photocatalytic hydrogen evolution performance. The photocatalytic hydrogen evolution rates of 5 wt% Cu–TiO2–C and 40 wt% MoS2–TiO2–C are 9225.75 and 5765.48 μmol g−1 h−1, respectively. It is proved that different postprocessing methods can tune the content of oxygen vacancy in TiO2−x and regulate the photocatalytic hydrogen evolution performance of TiO2−x materials. The interface regulation of the cocatalyst also contributes to the separation of photogenerated electron‐hole pairs and serves as active sites to enhance hydrogen evolution performance.

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Section: Resultsmentioning

confidence: 99%

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures

Cheng

Wang

et al. 2023

Adv Energy and Sustain Res

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“…However, its activity is restricted by the low light utilization, high photogenerated carrier recombination, and limited active sites. As one of the most important defects, oxygen vacancies can efficiently improve the NRR activity of TiO 2 . ,− Liao et al immobilized Ti 3 C 2 MXene on P25, which introduced abundant oxygen vacancies into P25. DFT calculations (Figure a and b) demonstrated that OV-TiO 2 presented a longer NN bond and shorter Ti–N bonds compared to pristine TiO 2 , which confirmed that N 2 molecules were apt to be an adsorbed and activated layer on OV-TiO 2 .…”

Section: Construction Of Active Sites For Nrrmentioning

confidence: 99%

Research Progress and Perspectives on Active Sites of Photo- and Electrocatalytic Nitrogen Reduction

et al. 2022

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Ammonia is closely relevant to human production and life. Although the widely used conventional Haber−Bosch process has a relatively high ammonia yield, it has obvious disadvantages of high energy consumption, serious pollution, and harsh reaction conditions. Compared with the Haber−Bosch process, photo-and electrocatalytic N 2 fixation has been demonstrated to be energy-saving, environmentally friendly, and economical because the ammonia can be generated under mild conditions. During the photo/electrocatalytic ammonia-production processes, sunlight or electricity is used as the renewable energy input, the atmosphere is used as the nitrogen source, and water is used as the proton source. However, the ammonia yields of the photo-and electrocatalytic nitrogen fixation are commonly low, which is mainly resulted by the lack of active sites to adsorb N 2 molecules and active N�N triple bonds. On the basis of the discussion about the importance of active sites for ammonia synthesis by summarizing the reaction mechanism of photo-and electrocatalytic methods, we outline the common methods of producing abundant active sites of N 2 adsorption and activation on the surface of catalysts, including vacancy introduction, heteroatom doping, cocatalyst support, and frustrated Lewis pairs construction. We also summarize the detection methods of ammonia, as well as other problems existing during the photo-and electrocatalytic nitrogen-fixation processes.

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“…These positively charged OVs have a strong affinity for N 2 , resulting in N 2 activation. 30 As a result, the ammonia synthesis efficiency of the prepared PCECs was enhanced. In addition to the significantly enhanced activity, the S 0.9 TF catalyst exhibited good catalytic durability toward NRR.…”

Section: Introductionmentioning

confidence: 97%

Sr_xTi_0.6Fe_0.4O_3−δ (x = 1.0, 0.9) catalysts for ammonia synthesis via proton-conducting solid oxide electrolysis cells (PCECs)

Wang

Chen

et al. 2022

J. Mater. Chem. A

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Li-intercalation boosted oxygen vacancies enable efficient electrochemical nitrogen reduction on ultrathin TiO2 nanosheets

Cited by 39 publications

References 50 publications

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures

Research Progress and Perspectives on Active Sites of Photo- and Electrocatalytic Nitrogen Reduction

Sr_xTi_0.6Fe_0.4O_3−δ (x = 1.0, 0.9) catalysts for ammonia synthesis via proton-conducting solid oxide electrolysis cells (PCECs)

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Li-intercalation boosted oxygen vacancies enable efficient electrochemical nitrogen reduction on ultrathin TiO2 nanosheets

Cited by 39 publications

References 50 publications

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO2 Nanostructures

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO2 Nanostructures

Research Progress and Perspectives on Active Sites of Photo- and Electrocatalytic Nitrogen Reduction

SrxTi0.6Fe0.4O3−δ (x = 1.0, 0.9) catalysts for ammonia synthesis via proton-conducting solid oxide electrolysis cells (PCECs)

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Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures

Impact of Postprocessing Approaches and Interface Cocatalysts Regulation on Photocatalytic Hydrogen Evolution of Protonic Titanate Derived TiO₂ Nanostructures

Sr_xTi_0.6Fe_0.4O_3−δ (x = 1.0, 0.9) catalysts for ammonia synthesis via proton-conducting solid oxide electrolysis cells (PCECs)