2020
DOI: 10.1016/j.solmat.2019.110377
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Engineering interfacial modification on nanocrystalline hematite photoanodes: A close look into the efficiency parameters

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Cited by 15 publications
(15 citation statements)
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“…[21][22][23][24][25] From the η sep perspective, the addition of Ti, Sn, and Sb elements have demonstrated to be promising candidates on enhancing the electronic conductivity and, consequently, the efficiency in charge separation. 11,24,[26][27][28][29][30] Besides, the target of these elements addition is similar (η sep ), but how they act in the system can be in distinct ways: (a) Increasing the number of donor density number when doping, (b) improving the bulk electronic conductivity by decreasing the voltage barrier at grain boundary, (c) increasing the band bending, fomenting the charge separation or even (d) the combination of them. Specifically, the literature has been wide and controversial regarding the role-played by Sn incorporated into hematite-based nanoceramic, which can be mainly associated with different strategy of Sn-insertion.…”
Section: Introductionmentioning
confidence: 99%
“…[21][22][23][24][25] From the η sep perspective, the addition of Ti, Sn, and Sb elements have demonstrated to be promising candidates on enhancing the electronic conductivity and, consequently, the efficiency in charge separation. 11,24,[26][27][28][29][30] Besides, the target of these elements addition is similar (η sep ), but how they act in the system can be in distinct ways: (a) Increasing the number of donor density number when doping, (b) improving the bulk electronic conductivity by decreasing the voltage barrier at grain boundary, (c) increasing the band bending, fomenting the charge separation or even (d) the combination of them. Specifically, the literature has been wide and controversial regarding the role-played by Sn incorporated into hematite-based nanoceramic, which can be mainly associated with different strategy of Sn-insertion.…”
Section: Introductionmentioning
confidence: 99%
“…A later approach of varying the viscosity of the precursor solution with ethanol demonstrated that similar and higher photocurrent density could be obtained for both pristine and Sn-modified hematite monolayers, with grains oriented in the [110] plane [76]. Interestingly, although this single deposition simplifies the fabrication process and reduces the number of grain interfaces found in the previous study, the thickness remained at 130 nm, which is still far from the optimal value for hematite films.…”
Section: Polymeric-precursor Solution-based Methodsmentioning
confidence: 70%
“…To design photoelectrodes for PEC devices, as the epitaxial growth of thin films onto substrates, a systematic control over the polymeric precursor solution, its deposition conditions, and the thermal treatment parameters are crucial to performance. One of the invariable points observed in different films prepared from the PP method was morphology, consisting of elongated grains with different diameters and lengths [76,[146][147][148][149][150]. For hematite films, XRD analysis has shown that the PP approach led to the formation of the hematite phase with preferential orientation in the [110] axis vertical plane that possesses a strong anisotropy in electronic conductivity, which is similar to nanorod or nanowire morphology.…”
Section: Polymeric-precursor Solution-based Methodsmentioning
confidence: 99%
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“…In this case, Sn species can accumulate on grain boundary rather than hematite structure, since the last process is more difficult and Sn accumulation on surface or grain boundary is favored 92 . Nonetheless, such accumulation on grain boundaries contributes to smaller grain size that can help to improve the electrochemical response of the hematite photoanodes, compared to the bare hematite, as observed in our Pechini‐based ones and related to better charge separation efficiency 93 …”
Section: Sn‐modified Hematite Photoanodesmentioning
confidence: 67%