Dual-defect semiconductor photocatalysts for solar-to-chemical conversion: advances and challenges

Li, Tianqi; Li, Yufeng; Guo, Changfa; Hu, Yong

doi:10.1039/d3cc06102g

Cited by 5 publications

(6 citation statements)

References 165 publications

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“…According to the XPS results, Ni 0.85 Se has a larger content of Ni 3+ and a smaller content of Ni 2+ compared to NiSe, indicating the larger amount of Ni 2+ vacancies in Ni 0.85 Se. 46 The above results are well consistent with the previously reported values for Ni 0.85 Se and NiSe. 26,47,51 The presence of Ni 3+ in NiSe can further confirm the calculated Ni/ Se atomic ratios and ICP results.…”

Section: Resultssupporting

confidence: 93%

“…The peaks of Ni 2p spectra at 870.7/870.5 and 853.4/853.2 eV can be attributed to the Ni 2p 1/2 and Ni 2p 3/2 orbits of Ni 2+ ions in Ni 0.85 Se/NiSe, while the higher peaks at 873.4/873.1 and 855.8/855.6 eV can be indexed to Ni 3+ . According to the XPS results, Ni 0.85 Se has a larger content of Ni 3+ and a smaller content of Ni 2+ compared to NiSe, indicating the larger amount of Ni 2+ vacancies in Ni 0.85 Se . The above results are well consistent with the previously reported values for Ni 0.85 Se and NiSe. ,, The presence of Ni 3+ in NiSe can further confirm the calculated Ni/Se atomic ratios and ICP results.…”

Section: Resultssupporting

confidence: 90%

“…By comparing the refined values of a , b , c , and V , Ni 0.85 Se has smaller lattice parameters than NiSe, which may be caused by the presence of Ni 2+ vacancies . The refined lattice parameters (Table ) are smaller than the corresponding standard results (Table S1), indicating that Ni vacancies are formed in Ni 0.85 Se and NiSe during the hydrothermal process . It is speculated that Ni 2+ vacancies are caused by the special open-channel crystal structures of Ni 0.85 Se and NiSe.…”

Section: Resultsmentioning

confidence: 92%

“…45 The refined lattice parameters (Table 1) are smaller than the corresponding standard results (Table S1), indicating that Ni vacancies are formed in Ni 0.85 Se and NiSe during the hydrothermal process. 46 It is speculated that Ni 2+ vacancies are caused by the special open-channel crystal structures of Ni 0.85 Se and NiSe. This deduction can be confirmed by the PXRD patterns of NiSe before and after being washed in the final stage of the synthesis.…”

Section: Resultsmentioning

confidence: 99%

“…21 Second, Ni 2+ vacancies induce the generation of localized disorderly oriented domains, which improve the electronic conductivity (Figure S10) and favor the charge transfer. 46,70,74 Therefore, the redox reaction kinetics is facilitated, leading to enhanced rate performance. Third, the existence of Ni 2+ vacancies in the crystal lattice can expose more electrochemical reactive sites, increasing the contact area with the electrolyte and accordingly resulting in effective penetration of the electrolyte.…”

Section: Resultsmentioning

confidence: 99%

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M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

Liu,

Zhang,

et al. 2024

ACS Appl. Nano Mater.

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Transition-metal doping engineering is an important strategy to adjust the structures of electrode materials (i.e., nickel selenides) for supercapacitors (SCs), and there remain great challenges to seek rational methods for realizing systematical doping. Herein, based on the open-channel structures of Ni 0.85 Se and NiSe, a simple hydrothermal process combined with a universal ion exchange reaction was designed to fabricate Ni 0.85−x Se and NiSe nanoflowers doped by a series of 3d-transition-metal M 2+ ions (M = Co, Cu, and Zn). Structure, morphology, and spectroscopic characterizations as well as Rietveld refinement were employed to research the phases, morphologies, and compositions of Ni 0.85−x Se, NiSe, M x Ni 0.85−x Se, and M x Ni 1−x Se. It was demonstrated that the unique structures of Ni 0.85 Se and NiSe reduce the activation energies of M 2+ ions transported through the interstitial lattice position, and the formation of Ni 2+ vacancies decreases the steric hindrance of the insertion of divalent cations.Thus, Ni 2+ was easily substituted by M 2+ ions via cation exchange reaction at room temperature in water, realizing a 5−7% doping amount. Such transition-metal doping effects, from crystal structure modulation to electronic conductivity improvement, can effectively enhance the supercapacitor properties of Ni 0.85 Se and NiSe. The Co x Ni 1−x Se electrode delivers specific capacitances of 918.8, 770.5, 617.5, 496.9, and 437.5 F g −1 at 1, 2, 5, 7.5, and 10 A g −1 , respectively, which is the best among the eight electrodes. Besides, the "kick-out" cation exchange mechanism for the synthesis of M x Ni 0.85−x Se and M x Ni 1−x Se was discussed in detail. This work gives us feasible guidance to fabricate desired nickel selenides for SCs; moreover, the facile and universal cation exchange route can be expanded to purposefully design other cation-doped transition-metal selenides for energy storage.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

Liu,

Zhang,

et al. 2024

ACS Appl. Nano Mater.

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S‐Scheme MnO₂/Co₃O₄ Sugar‐Gourd Nanohybrids with Abundant Oxygen Vacancies for Efficient Visible‐Light‐Driven CO₂ Reduction

Jin,

Yu,

Wang

et al. 2024

ChemCatChem

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Converting CO2 to carbon‐based fuels using solar energy via photocatalysis is a promising approach to boost carbon neutrality. However, the solar‐to‐chemical conversion efficiency is hampered by interconnected multiple factors including insufficient light absorption, low separation efficiency of photogenerated carriers as well as complex and sluggish surface reaction kinetics. Herein, we incorporate MnO2 nanowires and Co3O4 hollow polyhedrons with abundant oxygen vacancies (Vo) into MnO2/Co3O4 sugar‐gourd nanohybrids for boosting CO2 photoreduction. The MnO2/Co3O4 nanohybrids not only display strong absorption in the visible–near infrared region, but also facilitate the separation of photogenerated carriers in terms of S‐scheme transfer pathway, supplying abundant electrons for CO2 reduction reaction. Furthermore, the presence of VO enhances the separation efficiency of photogenerated carriers and promotes the chemical adsorption to CO2 molecules. In addition, the interfacial electronic interaction between MnO2 and Co3O4 also contributes to the chemical adsorption and activation to CO2. Owing to the synergy of S‐scheme transfer pathway and VO, the MnO2/Co3O4 hybrids exhibit greatly enhanced photocatalytic activity towards CO2 reduction under the irradiation of visible light in comparison with bare MnO2 and Co3O4, delivering a CO evolution rate of 15.9 umol g−1 h−1 with a 100% selectivity.

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One‐Step Decoration of Subnanometer MoO_x Clusters on Bi₁₁VO₁₉ Nanotubes for Visible‐Light‐Driven Water Oxidation

Jin,

Cheng,

Guo

et al. 2024

ChemSusChem

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For the sluggish reaction kinetics due to a four‐electron transfer process, water oxidation is always a major obstacle to solar splitting of water to hydrogen. It remains a tough challenge to develop efficient nonnoble‐metal photocatalysts for water oxidation. Herein, we decorate the host photocatalyst of Bi11VO19 nanotubes with the coatalyst of subnanometer MoOx clusters (denoted as Bi11VO19/MoOx hetero‐nanotubes) via a one‐step cation‐exchange solvothermal reaction using Na2V6O16 nanowires as the hard template. It is observed that the morphology and microstructure of Bi11VO19/MoOx hetero‐nanotubes vary with the dosage of Mo source and polyvinylpyrrolidone, as well as with the solvent composition. The optimized Bi11VO19/MoOx hetero‐nanotubes significantly enhance the photooxidation of water to oxygen with visible light, delivering an oxygen production rate of 790 mmol g−1 h−1, which is 12 times that of bare Bi11VO19 nanotubes. In situ X–ray photoelectron spectroscopy and (photo)electrochemical characterization suggest that the enhanced photoactivity may be caused by the decorated cocatalyst of MoOx clusters, which extracts electrons from Bi11VO19 nanotubes, leaving an abundance of holes for water photooxidation. This work demonstrates a potential strategy to develop photocatalysts for energy conversion by constructing Bi11VO19‐based nanostructures.

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Dual-defect semiconductor photocatalysts for solar-to-chemical conversion: advances and challenges

Abstract: Among the renewable energy technologies to deal with increasing energy crisis and environmental concerns, solar-to-chemical conversion via photocatalysis holds great promise for sustainable energy supply. To this end, a variety...

Cited by 5 publications

References 165 publications

M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

S‐Scheme MnO₂/Co₃O₄ Sugar‐Gourd Nanohybrids with Abundant Oxygen Vacancies for Efficient Visible‐Light‐Driven CO₂ Reduction

One‐Step Decoration of Subnanometer MoO_x Clusters on Bi₁₁VO₁₉ Nanotubes for Visible‐Light‐Driven Water Oxidation

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Dual-defect semiconductor photocatalysts for solar-to-chemical conversion: advances and challenges

Abstract: Among the renewable energy technologies to deal with increasing energy crisis and environmental concerns, solar-to-chemical conversion via photocatalysis holds great promise for sustainable energy supply. To this end, a variety...

Cited by 5 publications

References 165 publications

M2+-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

M2+-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

S‐Scheme MnO2/Co3O4 Sugar‐Gourd Nanohybrids with Abundant Oxygen Vacancies for Efficient Visible‐Light‐Driven CO2 Reduction

One‐Step Decoration of Subnanometer MoOx Clusters on Bi11VO19 Nanotubes for Visible‐Light‐Driven Water Oxidation

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Product

Resources

About

M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

M²⁺-Doped Nickel Selenide Nanoflowers (M = Co, Cu, and Zn) for Supercapacitors

S‐Scheme MnO₂/Co₃O₄ Sugar‐Gourd Nanohybrids with Abundant Oxygen Vacancies for Efficient Visible‐Light‐Driven CO₂ Reduction

One‐Step Decoration of Subnanometer MoO_x Clusters on Bi₁₁VO₁₉ Nanotubes for Visible‐Light‐Driven Water Oxidation