Electrospun 1D Ta3N5 -(O) nanofibers as advanced electrocatalysts for hydrogen evolution reaction in proton exchange membrane water electrolyser

Mukkavilli, Raghunath Sharma; Ichangi, Arun; Thiyagarajan, Ganesh Babu; Vollnhals, Florian; Wilhelm, Michael; Bhardwaj, Aman; Christiansen, Silke; Neelakantan, Lakshman; Mathur, Sanjay; Kumar, Ravi

doi:10.1016/j.oceram.2022.100267

Cited by 5 publications

(7 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The LSV measurements in 1 mol L −1 KOH show that MoP/NPC delivers a current of 10 mA cm −2 with an overpotential of 163 mV. Similarly, Mukkavilli et al fabricated Ta 3 N 5 -(O) nanofibers using electrospinning, and this 1D structure was implemented as electrocatalysis in a polymer electrolyte membrane electrolyzer [67]. This material was developed by mixing tantalum ethoxide, polyvinyl pyrrolidine, ethanol, and acetic acid.…”

Section: Hydrogen Evolution Reaction On Noble-metal-free Electrocatal...mentioning

confidence: 99%

Water Splitting as an Alternative for Electrochemical Hydrogen and Oxygen Generation: Current Status, Trends, and Challenges

Şahin

Pech-Rodríguez²,

Meléndez-González

et al. 2023

Energies

View full text Add to dashboard Cite

Water splitting technology is an innovative strategy to face the dependency on fossil fuels and, at the same time, address environmental pollution issues. Electrocatalysts seem to be the better option to improve water separation efficiency and satisfy the commercial-scale demand for hydrogen. Therefore, the design and fabrication of heterostructures with a high affinity for achieving water splitting have been proposed. In this review, the application of several electrocatalysts for hydrogen and oxygen evolution reactions is presented and discussed in detail. A review of the recent advances in water separation using noble metals such as Pt-, Ir-, and Ru-based electrodes is presented, followed by a highlighting of the current trends in noble-metal-free electrocatalysts and novel preparation methods. Furthermore, it contemplates some results of a hybrid organic molecule–water electrolysis and photoelectrochemical water splitting. This review intends to give insight into the main trends in water splitting and the barriers that need to be overcome to further boost the efficiency of the main hydrogen and oxygen generation systems that ultimately result in large-scale applications. Finally, future challenges and perspectives are addressed, considering all the novelties and the proposed pathways for water splitting.

show abstract

Section: Hydrogen Evolution Reaction On Noble-metal-free Electrocatal...mentioning

confidence: 99%

Water Splitting as an Alternative for Electrochemical Hydrogen and Oxygen Generation: Current Status, Trends, and Challenges

Şahin

Pech-Rodríguez²,

Meléndez-González

et al. 2023

Energies

View full text Add to dashboard Cite

show abstract

“…Whether the starting material is a tantalum oxide or an oxygen-containing precursor, the tantalum nitride that forms will invariably have oxygen dissolved in it. 7,13 Another source of oxygen is the gas atmosphere (nitrogen or ammonia) used in the synthesis. There are many studies that suggest the role of oxygen in the stabilization of high-pressure nitrides at ambient pressures.…”

Section: Introductionmentioning

confidence: 99%

“…Oxygen is often present as an impurity in tantalum nitrides due to its synthesis routes. Whether the starting material is a tantalum oxide or an oxygen‐containing precursor, the tantalum nitride that forms will invariably have oxygen dissolved in it 7,13 . Another source of oxygen is the gas atmosphere (nitrogen or ammonia) used in the synthesis.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of oxygen‐containing Ta3N5${\rm {Ta}}_3{\rm {N}}_5$

Moharana,

Ghosh,

Dasgupta

et al. 2024

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

Transition metal nitrides, especially tantalum nitrides, are pivotal for applications in extreme environments demanding excellent mechanical properties and thermodynamic stability. Among them, ‐TaN, a high‐pressure polymorph of tantalum nitride with its exceptional bulk modulus (362 GPa) and hardness (31.7 GPa) promises to have many technological uses. Another nitride, , has gained importance as a photocatalyst for water splitting using visible light. The Ta–N phase diagram indicates that the thermal decomposition of pure leads to the formation of ‐TaN. However, usually has some amount of oxygen as an impurity mainly due to its synthesis route. We found that the ‐TaN phase, which is usually observed at high pressures, is formed during the thermal decomposition of oxygen containing . The presence of ‐TaN is verified using several experimental techniques such as X‐ray diffraction, Raman spectra, high‐angle annular dark field scanning transmission electron microscopy (STEM‐HAADF), and electron energy loss spectroscopy (EELS). Elemental distribution analyzed through energy dispersion X‐ray spectroscopy (XEDS) in STEM reveals about 7 at.% of oxygen in ‐TaN. First‐principle calculations are performed to examine the thermodynamic stability of oxygen substituted ‐TaN and pure ‐TaN via formation enthalpies, elastic constants, and phonon dispersion calculations. The computational studies confirm that oxygen in ‐TaN enhances its thermodynamic stability. The calculated electron localization functions establish the bonding characteristics between Ta, N, and O, confirming the same.

show abstract

“…20 The performance parameters significantly improved when mesoporous TaN and fibrous Ta 3 N 5 were used suggesting the importance of microstructure-performance interdependence. 21,22 Despite such an increment in hydrogen kinetics, a major cause of concern is the unavoidable surface oxidation leading to a formation of TaO x layer resulting in performance degradation. 23,24 Such a layer with Ta-O-N bonds on the surface have also piqued the interest to understand in detail the hydrogen evolution kinetics of oxynitrides in general given the propensity of majority of nitrides to oxidize.…”

Section: Introductionmentioning

confidence: 99%

“…However, in literature reports exist on understanding HER kinetics in Ta–N phases with high onset behavior for both Ta 3 N 5 microparticles and Ta 3 N 5 /Ta foil 20 . The performance parameters significantly improved when mesoporous TaN and fibrous Ta 3 N 5 were used suggesting the importance of microstructure—performance interdependence 21,22 . Despite such an increment in hydrogen kinetics, a major cause of concern is the unavoidable surface oxidation leading to a formation of TaO x layer resulting in performance degradation 23,24 .…”

Section: Introductionmentioning

confidence: 99%

Large‐scale synthesis of centrifugally spun tantalum oxynitride fiber electrocatalysts for hydrogen evolution reaction

Mukkavilli

Saxena

et al. 2023

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

Tantalum oxynitride (TaOxN1−x) fibers were synthesized and evaluated for their electrocatalytic hydrogen activity using an in‐house developed centrifugal spinning setup. By tailoring the composition of the spinning solution and optimizing collector distance and rotation speed of the spinneret, bead‐free TaOxN1−x fibers with a diameter of 800 nm were obtained. The fibers were structurally characterized through phase and elemental analysis, confirming the formation of monoclinic TaOxN1−x with clear splitting of the X‐ray photoelectron spectroscopy peaks indicating Ta was in +5 oxidation state. The resulting oxynitride fibers exhibited superior electrocatalytic performance with low overpotentials (250 mV) to generate 10 mA/cm2 compared to Ta2O5 oxide fibers. Interestingly, the enhanced activity of oxynitride fibers was observed to be suppressed in basic medium due to the high oxophilicity of tantalum ions and a negative Gibbs adsorption‐free energy, leading to poisoning of the active sites. This work demonstrates a facile pathway for the fabrication of high‐performance electrocatalysts, based on TaOxN1−x fibers, from a cost‐effective and energy‐efficient centrifugal spinning technique.

show abstract

Electrospun 1D Ta3N5 -(O) nanofibers as advanced electrocatalysts for hydrogen evolution reaction in proton exchange membrane water electrolyser

Cited by 5 publications

References 41 publications

Water Splitting as an Alternative for Electrochemical Hydrogen and Oxygen Generation: Current Status, Trends, and Challenges

Water Splitting as an Alternative for Electrochemical Hydrogen and Oxygen Generation: Current Status, Trends, and Challenges

Thermal decomposition of oxygen‐containing Ta3N5${\rm {Ta}}_3{\rm {N}}_5$

Large‐scale synthesis of centrifugally spun tantalum oxynitride fiber electrocatalysts for hydrogen evolution reaction

Contact Info

Product

Resources

About