Constructing Fe2O3/TiO2 core–shell photoelectrodes for efficient photoelectrochemical water splitting

Wang, Meng; Pyeon, Myeongwhun; Gönüllü, Yakup; Kaouk, Ali; Shen, Shaohua; Guo, Liejin; Mathur, Sanjay

doi:10.1039/c5nr01493j

Cited by 73 publications

(31 citation statements)

References 57 publications

(56 reference statements)

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“…In Figure S5b (Supporting Information), the Co 2p 3/2 and Co 2p 1/2 orbits with a splitting of 15.4 eV are observed at 779.2 and 794.6 eV along with two shakeup satellites, revealing the coexistence of Co 3+ and Co 2+ in Co 3 O 4 . Furthermore, as shown in Figure S5c (Supporting Information), Fe 2p 3/2 and Fe 2p 1/2 orbits with a splitting of 13.4 eV were observed at 711 and 724.6 eV, which confirm the presence of Fe 3+ . Figure S6a (Supporting Information) shows the O 1s spectra of NiO/Co 3 O 4 microcubes, the peak of O1 at 529.2 eV represents the typical metal–oxygen bond, the peak of O2 at 531.1 eV corresponds to the hydroxyl group (OH) on the surfaces of NiO/Co 3 O 4 , and the peak of O3 at 532.5 eV can be ascribed to chemically and physically adsorbed water on the material surface .…”

Section: Resultssupporting

confidence: 75%

High Energy Capacitors Based on All Metal‐Organic Frameworks Derivatives and Solar‐Charging Station Application

Wei

Peng

et al. 2019

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High energy and efficient solar charging stations using electrochemical capacitors (ECs) are a promising portable power source for the future. In this work, two kinds of metal‐organic framework (MOF) derivatives, NiO/Co3O4 microcubes and Fe2O3 microleaves, are prepared via thermal treatment and assembled into electrochemical capacitors, which deliver a relatively high specific energy density of 46 Wh kg−1 at 690 W kg−1. In addition, a solar‐charging power system consisting of the electrochemical capacitors and monocrystalline silicon plates is fabricated and a motor fan or 25 LEDs for 5 and 30 min, respectively, is powered. This work not only adds two novel materials to the growing categories of MOF‐derived advanced materials, but also successfully achieves an efficient solar‐ECs system for the first time based on all MOF derivatives, which has a certain reference for developing efficient solar‐charge systems.

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Section: Resultssupporting

confidence: 75%

High Energy Capacitors Based on All Metal‐Organic Frameworks Derivatives and Solar‐Charging Station Application

Wei

Peng

et al. 2019

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“…In Figure S13 (Supporting Information), the LSV and I-t curves under chopped illumination of the photoanode are provided. [57] As for the TiO 2 /BaTiO 3 and Fe 2 O 3 /TiO 2 core/shell structures, [58,59] the photocurrent of 1.25 and 0.9 mA cm −2 at 1.23 V (vs RHE) in 1 m NaOH is reported. It is worth pointing out that the photocurrent density of the MOFs-derived Co 3 O 4 /TiO 2 /Si NR in both alkaline and neutral electrolyte, to our best of knowledge, is comparable to or even better than previously reported on the TiO 2 -based photoanodes (Table S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Metal–Organic Framework Derived Co₃O₄/TiO₂/Si Heterostructured Nanorod Array Photoanodes for Efficient Photoelectrochemical Water Oxidation

Tang

Zhou

Yuan

et al. 2017

Adv Funct Materials

128

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10. 1002/adfm.201701102. photoexcitation of semiconductor photoanode; the separation and migration of photoinduced carriers; the surface water reduction on the cathode; and water oxidation on the photoanode with photoinduced electrons/holes. [8][9][10] Therefore, to achieve effective solar-to-hydrogen (STH) process, all steps stated above should be in very efficient progress, which requires high optical response for the photoanode materials, [11] efficient carrier separation, and surface reaction. [12,13] Metal oxides (MOs), such as TiO 2 , [14] α-Fe 2 O 3 , [15] and WO 3 , [16,17] have been widely investigated as the photoanode materials for PEC water splitting, for their low-cost, environmentfriendly properties. However, as intrinsic semiconductor, the PEC performance of pristine MO photoanode is always hindered by the poor carrier mobility, narrow optical-response range, and slow surface water oxidation kinetics. [18,19] Therefore, designing composited photoanodes with proper band-gap energy structure is considered to be a promising route to overcome these limitations induced poor PEC performance. [20][21][22] For instance, via constructing semiconductor heterojunction with matched band position, the separation and transportation of photoinduced carrier can be effectively enhanced (such as Bi 2 MoO 6 /Si, [23] Ag/Fe 2 O 3 , [24] NiFe-LDH/C 3 N 4[25] heterojunction). Particularly, benefiting from the outstanding visiblelight response performance and carrier mobility within silicon, it has long been regarded as the most suitable material to build the solar energy conversion device. [26] As the conduction band (CB) of silicon is more negative than most of the common MO semiconductors (e.g., TiO 2 , [27,28] WO 3 ), [29] silicon can bring better electron reduction kinetics on the counter electrode. [30] However, it is not efficient to directly use only silicon as anode for PEC water oxidation due to the valence band (VB) of silicon is higher than the water oxidation potential. [23,31] In this regard, constructing MO/Si heterostructured photoanode is proposed to overcome the potential shortcomings of both MO and silicon simultaneously. To further improve the surface water oxidation kinetics of photoanode, introducing oxygen evolution reaction (OER) cocatalysts is regarded as a promising way to accelerate the four-electron water oxidation kinetics during the water splitting process. [8,32,33] Recently, the outstanding OER performance Water Splitting

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“…Considering the above‐mentioned issues with hematite, the requirement for an overpotential, which arises due to the sluggish oxygen evolving reaction (OER) kinetics and the presence of surface trap states, is of particular interest. To overcome these drawbacks and improve the PEC performance, surface modification with oxygen evolution catalysts (OEC) to overcome the OER kinetics issue have been employed, while surface passivation by various treatments have been shown to reduce the density of surface traps . Ruthenium oxide (RuO 2 ) and iridium oxide (IrO 2 ) have been demonstrated as cocatalysts with hematite to improve the OER activity, but Ru and Ir are precious metals with moderate OER activity, thus limiting their commercial potential .…”

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confidence: 99%

Highly Active MnO Catalysts Integrated onto Fe₂O₃ Nanorods for Efficient Water Splitting

Gurudayal

Jeong

Jin

et al. 2016

Adv Materials Inter

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Photoelectrochemical (PEC) water splitting is a critical area of research since it promises the efficient generation of solar energy within chemical fuels. The biggest technical barrier in realizing efficient PEC water splitting remains the integration of an efficient inexpensive catalyst for water oxidation. Herein, a solution based method to synthesize hematite nanorods treated with cobalt phosphate and MnO nanoparticles overlayers is demonstrated, which significantly improves the water oxidation efficiency for this photoanode material.

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Constructing Fe₂O₃/TiO₂ core–shell photoelectrodes for efficient photoelectrochemical water splitting

Cited by 73 publications

References 57 publications

High Energy Capacitors Based on All Metal‐Organic Frameworks Derivatives and Solar‐Charging Station Application

High Energy Capacitors Based on All Metal‐Organic Frameworks Derivatives and Solar‐Charging Station Application

Metal–Organic Framework Derived Co₃O₄/TiO₂/Si Heterostructured Nanorod Array Photoanodes for Efficient Photoelectrochemical Water Oxidation

Highly Active MnO Catalysts Integrated onto Fe₂O₃ Nanorods for Efficient Water Splitting

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Constructing Fe2O3/TiO2 core–shell photoelectrodes for efficient photoelectrochemical water splitting

Cited by 73 publications

References 57 publications

High Energy Capacitors Based on All Metal‐Organic Frameworks Derivatives and Solar‐Charging Station Application

High Energy Capacitors Based on All Metal‐Organic Frameworks Derivatives and Solar‐Charging Station Application

Metal–Organic Framework Derived Co3O4/TiO2/Si Heterostructured Nanorod Array Photoanodes for Efficient Photoelectrochemical Water Oxidation

Highly Active MnO Catalysts Integrated onto Fe2O3 Nanorods for Efficient Water Splitting

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Constructing Fe₂O₃/TiO₂ core–shell photoelectrodes for efficient photoelectrochemical water splitting

Metal–Organic Framework Derived Co₃O₄/TiO₂/Si Heterostructured Nanorod Array Photoanodes for Efficient Photoelectrochemical Water Oxidation

Highly Active MnO Catalysts Integrated onto Fe₂O₃ Nanorods for Efficient Water Splitting