Prospects of electrochemically synthesized hematite photoanodes for photoelectrochemical water splitting: A review

Phuan, Yi Wen; Ong, Wee‐Jun; Chong, Meng Nan; Ocon, Joey D.

doi:10.1016/j.jphotochemrev.2017.10.001

Cited by 120 publications

(68 citation statements)

References 287 publications

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“…Previous approaches have considered irradiation outside the cell through transparent conductive glass electrodes of indium tin oxide and fluorine-doped tin oxide (ITO/FTO) coated with semiconductor photocatalysts. However, this approach faces (i) electrode stability problems associated with leaching of the coatings and (ii) photon transport losses due to the absorption by glass [21][22][23]. Herein, a promising alternative reactor design is presented that uses a desirable parallel electrode arrangement in a single annular reactor compartment to promote a homogeneous current distribution [20,24].…”

Section: H Vbmentioning

confidence: 99%

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Montenegro-Ayo

Morales-Gomero

Alarcón

et al. 2019

Water

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Multiple discs coated with hierarchically-organized TiO2 anatase nanotubes served as photoelectrodes in a novel annular photoelectrocatalytic reactor. Electrochemical characterization showed light irradiation enhanced the current response due to photogeneration of charge carriers. The pharmaceutical acetaminophen was used as a representative water micropollutant. The photoelectrocatalysis pseudo-first-order rate constant for acetaminophen was seven orders of magnitude greater than electrocatalytic treatment. Compared against photocatalysis alone, our photoelectrocatalytic reactor at <8 V reduced by two fold, the electric energy per order (EEO; kWh m−3 order−1 for 90% pollutant degradation). Applying a cell potential higher than 8 V detrimentally increased EEO. Acetaminophen was degraded across a range of initial concentrations, but absorbance at higher concentration diminished photon transport, resulting in higher EEO. Extended photoelectrocatalytic reactor operation degraded acetaminophen, which was accompanied by 53% mineralization based upon total organic carbon measurements. This proof of concept for our photoelectrocatalytic reactor demonstrated a strategy to increase photo-active surface area in annular reactors.

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Section: H Vbmentioning

confidence: 99%

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Montenegro-Ayo

Morales-Gomero

Alarcón

et al. 2019

Water

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“…Up to now,several review articles on PEC water splitting are available,f ocusing on the system design, material development, selected promising materials,n anostructuring and kinetics aspects. [55][56][57][58][59][60][61] However,there is still no review about the application, design, and development of the specific category of perovskite oxides in PEC water splitting. This review summarizes advances in the design and development of perovskite oxides for PEC water splitting with ap articular emphasis on structural design, defect control, band gap engineering,i nterface/nanostructure construction and heterojunction/morphology control.…”

Section: Introductionmentioning

confidence: 99%

Perovskite Oxide Based Electrodes for High‐Performance Photoelectrochemical Water Splitting

et al. 2019

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Photoelectrochemical (PEC) water splitting is an attractive strategy for the large‐scale production of renewable hydrogen from water. Developing cost‐effective, active and stable semiconducting photoelectrodes is extremely important for achieving PEC water splitting with high solar‐to‐hydrogen efficiency. Perovskite oxides as a large family of semiconducting metal oxides are extensively investigated as electrodes in PEC water splitting owing to their abundance, high (photo)electrochemical stability, compositional and structural flexibility allowing the achievement of high electrocatalytic activity, superior sunlight absorption capability and precise control and tuning of band gaps and band edges. In this review, the research progress in the design, development, and application of perovskite oxides in PEC water splitting is summarized, with a special emphasis placed on understanding the relationship between the composition/structure and (photo)electrochemical activity.

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“…Besides the tubular structure, other morphologies and structures can be achieved by anodization technique, including nanosheets, nanowires and nanospikes. For example, Peerakiatkhajohn et al [130] have prepared the vertically aligned a- The ED growth is also a powerful technique for synthesizing metal oxide arrays, which has been widely used in PEC cells [96,[140][141][142][143]. The formation of metal oxide arrays using ED growth has the following steps: (i) nucleation on conductive substrates or on seed surfaces; (ii) oriented growth of metal oxide arrays, which depends on their intrinsic structures.…”

Section: Electrochemical (Ec) Growthmentioning

confidence: 99%

Current progress in developing metal oxide nanoarrays-based photoanodes for photoelectrochemical water splitting

et al. 2019

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Prospects of electrochemically synthesized hematite photoanodes for photoelectrochemical water splitting: A review

Cited by 120 publications

References 287 publications

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Perovskite Oxide Based Electrodes for High‐Performance Photoelectrochemical Water Splitting

Current progress in developing metal oxide nanoarrays-based photoanodes for photoelectrochemical water splitting

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