Low-temperature sintering of ZnO:Al ceramics by means of chemical vapor transport

Colibaba, G.V.; Rusnac, D.; Costriucova, Natalia V.; Shikimaka, O.; Monaico, Eduard

doi:10.1007/s10854-022-09458-1

Cited by 1 publication

(2 citation statements)

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“…24 Thus, ZnO is an adaptable nanomaterial with numerous uses in sunscreens, 25 cosmetics, 26 antibacterial coating, 27 chemical gas sensors, 28 biosensors, 29 thin-film transistors (TFTs), 30 photovoltaic devices, 31 supercapacitors, 32 photocatalysis, and electrocatalysis. 33,34 Several synthesis methods have been employed to produce zinc oxide (ZnO), including sol−gel, 35 hydrothermal, 36 solvothermal, 37 chemical precipitation, 38 chemical vapor transport, 39 spray pyrolysis, 40 and electrochemical method. 41 Despite several benefits, simple, scalable synthesis methods, and diverse applications of ZnO, it suffers from a few drawbacks that limit its effectiveness and practicality for overall water splitting due to the rapid charge carrier recombination and slow-moving kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…Excitons are bound states of an electron and a hole that forms when an electron is excited into the conduction band from its valence band . Thus, ZnO is an adaptable nanomaterial with numerous uses in sunscreens, cosmetics, antibacterial coating, chemical gas sensors, biosensors, thin-film transistors (TFTs), photovoltaic devices, supercapacitors, photocatalysis, and electrocatalysis. , Several synthesis methods have been employed to produce zinc oxide (ZnO), including sol–gel, hydrothermal, solvothermal, chemical precipitation, chemical vapor transport, spray pyrolysis, and electrochemical method …”

Section: Introductionmentioning

confidence: 99%

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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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