Role of lithium doping on α-Fe2O3 photoanode for enhanced photoelectrochemical water oxidation

Cai, Jiajia; Xu, Liangcheng; Tang, Xiangxuan; Kong, Lingna; Wang, Jianmin; Wang, Ruifei; Li, Xiuling; Xie, Qian; Mao, Keke; Pan, Haijun

doi:10.1016/j.jallcom.2022.165349

Cited by 14 publications

(9 citation statements)

References 39 publications

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“… 66 , 67 In order to have a better and faster understanding of the numerical result of chopped light J – V curves, we find it convenient to calculate the ratio of the spike and steady currents over the average photocurrent in the range of 1.3–1.4 V versus RHE, which yield the percent efficiency for holes being used in water oxidation. 38 , 66 , 68 The non-doped sample displays a charge extraction efficiency of 20%. Li-doping can double the efficiency to about 43%.…”

Section: Resultsmentioning

confidence: 99%

“…Figure c presents the chopped light J – V curves, which display the typical current transients. The positive current transients, that is, increasing spikes, testify that not all the holes that reach the interface contribute to the OER, while the negative current transients mean that there is recombination between electrons and photo-oxidized surface species. , In order to have a better and faster understanding of the numerical result of chopped light J – V curves, we find it convenient to calculate the ratio of the spike and steady currents over the average photocurrent in the range of 1.3–1.4 V versus RHE, which yield the percent efficiency for holes being used in water oxidation. ,, The non-doped sample displays a charge extraction efficiency of 20%. Li-doping can double the efficiency to about 43%.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, theory suggests that double donor doping can create two Fe 2+ cations, positively affecting the hopping characteristics of charge carriers in hematite. , One possible candidate for double-doping are Li + -ions. Li + -doping of iron oxide has been investigated and tested successfully for Li-ion batteries. , To date, there is only one study showing Li + -doped hematite with respect to photoelectrocatalytic applications and none that combines both.…”

Section: Introductionmentioning

confidence: 99%

“…Li + -doping of iron oxide has been investigated 35 and tested successfully for Li-ion batteries. 36,37 To date, there is only one study 38 showing Li + -doped hematite with respect to photoelectrocatalytic applications and none that combines both. By considering the charge transfer band and upper Hubbard band, the most promising approach appears to be bulk n-type doping and a surface p-type doping.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Oxygen Evolution Reaction Activity in Hematite Photoanodes: Effect of Sb-Li Co-Doping

et al. 2023

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Co-doping represents a valid approach to maximize the performance of photocatalytic and photoelectrocatalytic semiconductors. Albeit theoretical predictions in hematite suggesting a bulk n-type doping and a surface p-type doping would deliver best results, hematite co-doping with coupled cations possessing low and high oxidation states has shown promising results. Herein, we report, for the first time, Sb and Li co-doping of hematite photoanodes. Particularly, this is also a seminal work for the introduction of the highly reactive Sb 5+ directly into the hematite thin films. Upon co-doping, we have a synergistic effect on the current densities with a 67-fold improvement over the standard. Via a combined investigation with profuse photoelectrochemical measurements, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman analyses, we confirm the two doping roles of Sb 5+ and Li + as the substitutional and interstitial dopant, respectively. The improvements are attributed to a higher charge carrier concentration along with a lower charge transfer resistance at the surface.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Oxygen Evolution Reaction Activity in Hematite Photoanodes: Effect of Sb-Li Co-Doping

et al. 2023

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The production of highly efficientvisible‐light‐driven electrospunα‐Fe₂O₃photocatalyst through modifying iron source material for wastewater treatment applications

Alp

Borazan

2023

J Chinese Chemical Soc

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Background: Heterogeneous photocatalysis has been considered one of the most attractive methods in the wastewater remediation process due to allowing continuous re-use, the reactions taking place at room temperature, and photocatalysts are inexpensive.Objective: With the optimization of the structural properties of hematite at the nanometer level by utilizing engineering strategies such as morphology regulation, and shape control, it is possible to enhance its photocatalytic performance. The study's main objective is to improve photocatalytic performances of visible-light photoactive hematite materials produced by engineering strategies.Methods: The α-Fe 2 O 3 photocatalyst fibres with highly porous were fabricated by electrospinning method, allowing extraordinary length, a large ratio of length to diameter, hierarchically porous structure, high surface area, small grain sizes, and high porosity.Results: In the heterogeneous photocatalysis of the electrospun α-Fe 2 O 3 nanofibers against two model dyes representing anionic (MO) and cationic (RhB) characteristics, both electrospun α-Fe 2 O 3 nanofibers showed good photocatalytic activity against used model pollutants. The α-α-Fe 2 O 3 nanofibers produced using iron(III) chloride hexahydrate exhibited a higher photocatalytic degradation rate against both dye pollutants relative to the α-α-Fe 2 O 3 nanofibers produced using iron(III) chloride. Conclusions: Depending on the used iron sources and associatively their final morphological characteristics, it was observed that their photocatalytic degradation performances were seriously affected. It is suggested that electrospun α-Fe 2 O 3 nanofibers, especially those with highly porous and smaller diameters, are suitable candidates as a visible-light-driven semiconductor material to use in advanced oxidation processes for removing pollutants from wastewater.

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Recrystallization reduces surface oxygen vacancies to unlock hole transfer channel for hematite photoelectrochemistry

Shang,

Wang,

Yin

et al. 2024

Current Applied Physics

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Role of lithium doping on α-Fe2O3 photoanode for enhanced photoelectrochemical water oxidation

Cited by 14 publications

References 39 publications

Enhanced Oxygen Evolution Reaction Activity in Hematite Photoanodes: Effect of Sb-Li Co-Doping

Enhanced Oxygen Evolution Reaction Activity in Hematite Photoanodes: Effect of Sb-Li Co-Doping

The production of highly efficientvisible‐light‐driven electrospunα‐Fe₂O₃photocatalyst through modifying iron source material for wastewater treatment applications

Recrystallization reduces surface oxygen vacancies to unlock hole transfer channel for hematite photoelectrochemistry

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Role of lithium doping on α-Fe2O3 photoanode for enhanced photoelectrochemical water oxidation

Cited by 14 publications

References 39 publications

Enhanced Oxygen Evolution Reaction Activity in Hematite Photoanodes: Effect of Sb-Li Co-Doping

Enhanced Oxygen Evolution Reaction Activity in Hematite Photoanodes: Effect of Sb-Li Co-Doping

The production of highly efficientvisible‐light‐driven electrospunα‐Fe2O3photocatalyst through modifying iron source material for wastewater treatment applications

Recrystallization reduces surface oxygen vacancies to unlock hole transfer channel for hematite photoelectrochemistry

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The production of highly efficientvisible‐light‐driven electrospunα‐Fe₂O₃photocatalyst through modifying iron source material for wastewater treatment applications