Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing

Ramesh, Asha; Gavaskar, Dasari Sunil; Nagaraju, P.; Duvvuri, Suryakala; Vanjari, Siva Rama Krishna; Subrahmanyam, Ch.

doi:10.1016/j.apsadv.2022.100349

Cited by 16 publications

(11 citation statements)

References 70 publications

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“…The distinctive electronic structure (Co 3+ : 3d 5 4s 1 ; Co 2+ : 3d 5 4s 2 ) accounts for the lower binding energy of Co 3+ compared to Co 2+ . − Multiple oxidation states of Co imply the ability of the material to have a high redox activity. The core-level spectrum of O 1s (Figure d) is split into three peaks, 529.4, 530.93, and 531.68 eV, which are attributed to the Co–oxygen bonds in the lattice, oxygen vacancies, and hydroxyl or water adsorbed on the oxide surface, respectively. − The XPS analysis confirms the formation of a composite structure.…”

Section: Resultsmentioning

confidence: 86%

Rod-Shaped Spinel Co₃O₄ and Carbon Nitride Heterostructure-Modified Fluorine-Doped Tin Oxide Electrode as an Electrochemical Transducer for Efficient Sensing of Hydrazine

Ramesh,

Maladan,

Sahu

et al. 2023

ACS Appl. Bio Mater.

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Engineering low-cost and efficient materials for sensing hydrazine (HA) is critical given the adverse effects of high concentrations on humans. We report an efficient electrode made up of rod-shaped Co3O4/g-C3N4 (Co3O4/graphitic carbon nitride (GCN))-coated fluorine-doped tin oxide as a desirable electrode for the detection of HA. GCN is synthesized by the thermal decomposition of melamine, Co3O4, and the heterostructure is grown by a hydrothermal process. The as-prepared materials were characterized by using spectroscopic and microscopic techniques. The voltammetric studies showed that HA can be oxidized at a lower onset potential of 0.24 V vs reference Ag/AgCl, and the composite yielded a significantly enhanced oxidation peak current than the pure components because of the high electrocatalytic activity and the synergy between Co3O4 and GCN. By employing chronoamperometry, the proposed sensor can detect HA in a wide range with a high sensitivity of 819.52 μA mM–1 cm–2 and a detection limit of 3.14 μM. The high conductivity of Co3O4, enhanced electroactive surface area, the rich redox couples of Co2+/Co3+, and the additional catalytic sites from GCN are responsible for the high performance of the heterostructure.

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Section: Resultsmentioning

confidence: 86%

Rod-Shaped Spinel Co₃O₄ and Carbon Nitride Heterostructure-Modified Fluorine-Doped Tin Oxide Electrode as an Electrochemical Transducer for Efficient Sensing of Hydrazine

Ramesh,

Maladan,

Sahu

et al. 2023

ACS Appl. Bio Mater.

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“…15 Besides, the ammonia gas sensor based on SnO 2 nanostructures fabricated by Beniwal and his team presented a response of 92% toward 500 ppm at ambient temperature and response/recovery times of 29/49 s. 16 To develop ammonia gas sensor-based ZnO material with higher performances, numerous ways are utilized such as (i) applying an electrostatic eld, (ii) using ultraviolet radiations in sensing operation, and (iii) doping materials using suitable metals. [17][18][19][20][21][22][23] In this study, we selected calcium as a dopant of ZnO to improve the sensing properties of ammonia gas. Calcium is cheap and non-toxic to human health contrary to other elements.…”

Section: Introductionmentioning

confidence: 99%

Ammonia gas sensors based on undoped and Ca-doped ZnO nanoparticles

Hjiri,

Algessair,

Dhahri

et al. 2024

RSC Adv.

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“…One of the most notable effects of Fe and Mn doping is the creation of new electronic states within the band gap of ZnO. 45 Further, Fe and Mn doping modification can alter ZnO's optical and electrical properties and improve its performance in optoelectronic, overall water splitting, and electronic devices. Therefore, Mn and Fe doping in ZnO offers a promising opportunity to cultivate the effectiveness and viability of electrocatalytic water-splitting reactions.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it has been explored that transition metals such as Fe and Mn doping into the crystal lattice of ZnO have a substantial impact on the properties of the ZnO nanostructure and create new opportunities for its use in various applications. One of the most notable effects of Fe and Mn doping is the creation of new electronic states within the band gap of ZnO . Further, Fe and Mn doping modification can alter ZnO’s optical and electrical properties and improve its performance in optoelectronic, overall water splitting, and electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Band Energy Modulation in an Fe–Mn–ZnO Nanowire–Nanosheet Catalyst for Efficient Overall Water Splitting

Mishra,

Choi,

Ryu

et al. 2024

Energy Fuels

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Here, we studied a simple, scalable, and in situ hydrothermal method to prepare an Fe−Mn-doped ZnO nanowire−nanosheet on a three-dimensional (3D) Ni-foam substrate for electrocatalytic overall water splitting. Attractively, the doping of Fe and Mn in ZnO plays a significant role in mobilizing the electron from Fe and Mn toward ZnO in the Fe−Mn-doped ZnO nanowire−nanosheet due to different vacuum levels of Fe, Mn, and ZnO, facilitating the development of more active sites on the surface of the catalyst, which plays a crucial role in improving the catalytic performances during overall water splitting. Consequently, the Fe−Mn-doped ZnO nanowire−nanosheet shows a lowermost overpotential of 230 mV and a lowermost Tafel slope of 115.2 mV dec −1 during the hydrogen evolution reaction (HER) and 248 mV overpotential and a short Tafel slope of 109.1 mV dec −1 during the oxygen evolution reaction (OER) in a 1.0 M KOH electrolyte. Besides, the Fe−Mn-doped ZnO nanowire−nanosheet depicts low charge transfer and series resistances of 3.7 and 0.41 Ω during the HER and 0.36 and 1.66 Ω during the OER, respectively. Also, it elucidates outstanding durability at −10 mA cm −2 for 12 h (HER) and 10 mA cm −2 for 12 h (OER) using chronopotentiometry and 1000 cycles. In addition, the Fe−Mn−ZnO||Fe− Mn−ZnO nanowire−nanosheet cell shows a lower potential of 1.74 V and outstanding stability over 24 h to deliver 10 mA cm −2 in electrocatalytic overall water splitting. Besides, the staircase stability of the Fe−Mn−ZnO||Fe−Mn−ZnO nanowire−nanosheet cell also suggests outstanding stability over 8.2 h at different current densities. Captivatingly, the concept of energy band modulation in the bimetallic doped Fe−Mn−ZnO nanowire−nanosheet catalyst is envisaged to explore insights into the mechanisms of the evolution of hydrogen and oxygen.

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Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing

Cited by 16 publications

References 70 publications

Rod-Shaped Spinel Co₃O₄ and Carbon Nitride Heterostructure-Modified Fluorine-Doped Tin Oxide Electrode as an Electrochemical Transducer for Efficient Sensing of Hydrazine

Rod-Shaped Spinel Co₃O₄ and Carbon Nitride Heterostructure-Modified Fluorine-Doped Tin Oxide Electrode as an Electrochemical Transducer for Efficient Sensing of Hydrazine

Ammonia gas sensors based on undoped and Ca-doped ZnO nanoparticles

Band Energy Modulation in an Fe–Mn–ZnO Nanowire–Nanosheet Catalyst for Efficient Overall Water Splitting

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Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing

Cited by 16 publications

References 70 publications

Rod-Shaped Spinel Co3O4 and Carbon Nitride Heterostructure-Modified Fluorine-Doped Tin Oxide Electrode as an Electrochemical Transducer for Efficient Sensing of Hydrazine

Rod-Shaped Spinel Co3O4 and Carbon Nitride Heterostructure-Modified Fluorine-Doped Tin Oxide Electrode as an Electrochemical Transducer for Efficient Sensing of Hydrazine

Ammonia gas sensors based on undoped and Ca-doped ZnO nanoparticles

Band Energy Modulation in an Fe–Mn–ZnO Nanowire–Nanosheet Catalyst for Efficient Overall Water Splitting

Contact Info

Product

Resources

About

Rod-Shaped Spinel Co₃O₄ and Carbon Nitride Heterostructure-Modified Fluorine-Doped Tin Oxide Electrode as an Electrochemical Transducer for Efficient Sensing of Hydrazine

Rod-Shaped Spinel Co₃O₄ and Carbon Nitride Heterostructure-Modified Fluorine-Doped Tin Oxide Electrode as an Electrochemical Transducer for Efficient Sensing of Hydrazine