Pseudobrookite based heterostructures for efficient electrocatalytic hydrogen evolution

Fernando, Niranjala; Swaminathan, Jayashree; Hernández, Francisco C. Robles; Priyadarshana, Gayan; Sandaruwan, Chanaka; Yang, Weidong; Karunaratne, Veranja; Wang, Zixing; Amaratunga, G.A.J.; Kottegoda, Nilwala; Ashokkumar, Meiyazhagan; Ajayan, Pulickel M.

doi:10.1016/j.matre.2021.100020

Cited by 8 publications

(7 citation statements)

References 51 publications

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“…In general, metal oxides are used in photocatalytic water splitting compared to the electrocatalytic application due to the low electric conductivity. Many researchers have used transition metal oxides for the HER application. , The ZnO-MXene nanocomposites synthesized and studied are the first of their kind for HER application to obtain cheaper electrocatalysts for green hydrogen production. Figure a shows the anodic polarization curves for HER of the materials.…”

Section: Resultsmentioning

confidence: 99%

Role of ZnO in ZnO Nanoflake/Ti₃C₂ MXene Composites in Photocatalytic and Electrocatalytic Hydrogen Evolution

Saini

Harikrishna

Laishram

et al. 2022

ACS Appl. Nano Mater.

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Herein, we report a simple hydrothermal synthesis of ZnO-Ti3C2 MXene nanocomposites with a varying wt % of ZnO to exploit the synergistic effect of 2D layer structured Ti3C2 and semiconductor ZnO for photocatalysis and electrocatalysis applications. A systematic study on the efficiency of ZnO-Ti3C2 nanocomposites toward the degradation of organic pollutants (dyes and pharmaceuticals) and the hydrogen evolution reaction (HER) is demonstrated. Among the developed nanohybrid catalysts, the ZnO-Ti3C2 composite with 10 wt % ZnO (MXZnO-10) showed the highest photodegradation efficiency of 76.4% within 10 min of the reaction and 99.2% in 60 min for methylene blue (MB) dye. The synergistic interactions between 2D layered Ti3C2 and ZnO improved the lifetime of electrons and holes by reducing the recombination rate. The uncombined electrons and holes facilitated the effective degradation of the MB dye. The ZnO-Ti3C2 nanocomposite with 5 wt % ZnO (MXZnO-5) showed excellent HER performance and exhibited an overpotential of 495 mV at 10 mA/cm2 with a Tafel slope of 108 mV/dec. This work widens the application range of transition metal oxide–MXene composites, providing potential substitute materials for photocatalysis and electrocatalysis applications.

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Section: Resultsmentioning

confidence: 99%

Role of ZnO in ZnO Nanoflake/Ti₃C₂ MXene Composites in Photocatalytic and Electrocatalytic Hydrogen Evolution

Saini

Harikrishna

Laishram

et al. 2022

ACS Appl. Nano Mater.

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“…The rate of photodegradation of methylene blue under sunlight (0.038 min −1 ) in the presence of 2 g/L, Fe 2 O 3 /Fe 2 TiO 5 /TiO 2 is greater than the rate of photodegradation of methylene blue (0.028 min −1 ) under 300 W simulated sunlight in the presence of 1 g/L of the same ternary heterostructure synthesized by Iron nitrate, tetrabutyl titanate and hexamethylenetetramine [108]. The reason cannot be directly attributed to the difference in the dosage of the catalyst as [109]. Multi-shelled TiO 2 /Fe 2 TiO 5 synthesized using TiCl 4 and FeCl 3 have shown to be effective in water oxidation under solar light [110].…”

Section: Research Gaps and Future Perspectivesmentioning

confidence: 92%

Leaching of ilmenite to produce titanium based materials: a review

2021

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Naturally available ilmenite mineral is being used as a starting material to produce titanium based products that have wide applications. Transformation of ilmenite to different titanium based materials by strong and weak acid, and base digestion, is discussed. Effects of temperature, concentration of acid/base, reaction time on dissolution of ilmenite are extensively reviewed. Characterization of the starting materials, intermediates and the products by x-ray diffraction, thermogravimetry, brunauer–emmett–teller surface area analysis, and scanning electron microscopy are presented. Further, advantages and disadvantages associated with the digestion methods are discussed.

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“…Therefore, numerous efforts have been committed to exploiting earth-abundant and efficient transition-metal-based electrocatalysts, , including oxides/hydroxides, − phosphides, − carbides, − nitrides, , chalcogenides, − and alloys. , Transition metal nitrides (TMNs) are the newly emerging and promising alternative to replace Pt among these catalysts due to their high conductivity, low cost, and corrosion resistance. − Studies have shown that the bonding structure and electronic properties of the parent metal have been modulated owing to the formation of TMNs, resulting in a catalytic effect similar to the noble metals . However, the intrinsic activity of TMNs still needs to be improved compared with the noble metal electrocatalysts in basic hydrogen evolution.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, numerous efforts have been committed to exploiting earth-abundant and efficient transition-metal-based electrocatalysts, 6,7 including oxides/hydroxides, 8−10 phos-phides, 11−14 carbides, 15−17 nitrides, 18,19 chalcogenides, 20−24 and alloys. 25,26 Transition metal nitrides (TMNs) are the newly emerging and promising alternative to replace Pt among these catalysts due to their high conductivity, low cost, and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

NiMo-Based Nanorod Arrays Supported on Ni Foams for Efficient Hydrogen Electrocatalysis

Yan

Cao

Ning

et al. 2022

ACS Appl. Nano Mater.

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The construction of low-cost electrocatalysts with good conductivity, excellent intrinsic activity, and superior stability is crucial for the hydrogen evolution reaction (HER). Herein, we report an outstanding catalyst (Ni 0.2 Mo 0.8 N/NiMoP 2 /MoO 2 @ NC) consisting of NiMo-based nanorod arrays supported on Ni foams for the efficient alkaline HER. It shows an ultralow overpotential of 48 mV and remarkable longevity for over 145 h at 10 mA cm −2 in 1.0 M KOH. The integration of ample compositions is favorable to the formation of heterointerfaces, accelerating electron transfer. The assembly of transition metal nitrides and phosphides fully develops the electrical conductivity of metal materials, which paves the way for superstability. The superior electrocatalytic activities can be attributed to the vital features, including the synergistic effect of Ni 0.2 Mo 0.8 N and NiMoP 2 , good electrical conductivity of MoO 2 , and corrosion resistance of NC basement. The present work proposes that regulating compositions and hierarchical nanostructures are of significance in developing electrode materials for the HER.

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Pseudobrookite based heterostructures for efficient electrocatalytic hydrogen evolution

Cited by 8 publications

References 51 publications

Role of ZnO in ZnO Nanoflake/Ti₃C₂ MXene Composites in Photocatalytic and Electrocatalytic Hydrogen Evolution

Role of ZnO in ZnO Nanoflake/Ti₃C₂ MXene Composites in Photocatalytic and Electrocatalytic Hydrogen Evolution

Leaching of ilmenite to produce titanium based materials: a review

NiMo-Based Nanorod Arrays Supported on Ni Foams for Efficient Hydrogen Electrocatalysis

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Pseudobrookite based heterostructures for efficient electrocatalytic hydrogen evolution

Cited by 8 publications

References 51 publications

Role of ZnO in ZnO Nanoflake/Ti3C2 MXene Composites in Photocatalytic and Electrocatalytic Hydrogen Evolution

Role of ZnO in ZnO Nanoflake/Ti3C2 MXene Composites in Photocatalytic and Electrocatalytic Hydrogen Evolution

Leaching of ilmenite to produce titanium based materials: a review

NiMo-Based Nanorod Arrays Supported on Ni Foams for Efficient Hydrogen Electrocatalysis

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Product

Resources

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Role of ZnO in ZnO Nanoflake/Ti₃C₂ MXene Composites in Photocatalytic and Electrocatalytic Hydrogen Evolution

Role of ZnO in ZnO Nanoflake/Ti₃C₂ MXene Composites in Photocatalytic and Electrocatalytic Hydrogen Evolution