Tuning orientation of doped hematite photoanodes for enhanced photoelectrochemical water oxidation

Li, Song; Cai, Jiajia; Liu, Yinglei; Gao, Mengdi; Cao, Feng; Qin, Gaowu

doi:10.1016/j.solmat.2017.12.028

Cited by 52 publications

(19 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is quite often noticed that while improving one particular parameter acts reversibly/negatively for another characteristic of the anode materials, which ultimately results in negligible improvement in overall performance of PEC cell or even sometimes worsens the performance. Hence, lowering V onset in hematite‐based photoanodes for OER is still a challenging task ,,,. In the following subsections, the surface modification strategies of α‐Fe 2 O 3 photoanodes including surface oxide overlayers for passivation, metal‐free carbon‐based materials, inorganic oxygen evolution co‐catalysts, and oxygen evolution molecular co‐catalysts loading will be introduced.…”

Section: General Strategies To Improve the Photoelectrochemical Perfomentioning

confidence: 99%

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

2018

View full text Add to dashboard Cite

The last few decades’ extensive research on the photoelectrochemical (PEC) water splitting has projected it as a promising approach to meet the steadily growing demand for cleaner and renewable energy in a sustainable and economically viable fashion. Among many potential photocatalysts, hematite (α‐Fe2O3) emerges as a highly promising photoanode material with favorable characteristics including visible light absorption (a suitable band gap energy), earth abundance, chemical stability, and low cost. A pronounced disadvantage of α‐Fe2O3 is its low photovoltage together with an extremely short hole diffusion length and a low electrical conductivity, which limit its PEC water oxidation performance. To make α‐Fe2O3 as a viable photocatalyst for PEC water splitting, one needs to rectify these unfavorable characteristics of α‐Fe2O3 by elaborated multiple modifications. In this review article, we introduce various modification strategies of hematite with emphasis on surface modifications to achieve low onset potential as well as high photocurrent approaching the theoretical value for solar water splitting.

show abstract

Section: General Strategies To Improve the Photoelectrochemical Perfomentioning

confidence: 99%

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

2018

View full text Add to dashboard Cite

show abstract

“…Freestanding nanoparticle (NP) ultra-thin membranes as a novel nanomaterial have been applied in various fields including integrated microcircuits, chemical sensors, and so on [1,2,3,4,5,6,7,8,9]. The multilayered structure of the membrane causes difficulties in studying its fundamental properties.…”

Section: Introductionmentioning

confidence: 99%

A Novel Strategy for Fabricating a Strong Nanoparticle Monolayer and Its Enhanced Mechanism

Zhou

Cao

et al. 2019

Nanomaterials

View full text Add to dashboard Cite

This work presents the preparation of cross-linking Au nanoparticle (NP) monolayer membranes by the thiol exchange reaction and their enhanced mechanical properties. Dithiol molecules were used as a cross-linking mediator to connect the adjacent nanoparticles by replacing the original alkanethiol ligand in the monolayer. After cross-linking, the membrane integrity was maintained and no significant fracture was observed, which is crucial for the membrane serving as a nanodevice. TEM (Transmission Electron Microscopy), UV–Vis absorption spectrum, and GISAXS (grazing incidence small angle X-ray scattering) were performed to characterize the nanostructure before and after cross-linking. All results proved that the interparticle distance in the monolayer was controllably changed by using dithiols of different lengths as the cross-linking agent. Moreover, the modulus of the cross-linking monolayer was measured by atomic force microscopy (AFM) and the result showed that the membrane with a longer dithiol molecule had a larger modulus, which might derive from the unbroken and intact structure of the cross-linking monolayer due to the selected appropriately lengthed dithiol. This study provides a new way of producing a nanoparticle monolayer membrane with enhanced mechanical properties.

show abstract

“…In addition to oxygen defects, a doping atom also has a positive influence on the stability of the supported catalyst. Particularly for metal oxide as a support, the doped atom would weaken the metal-oxygen bond in the metal oxide and hence reduce the energy barrier for the formation of oxygen vacancies and facilitate their creation [73][74][75][76][77][78]. As previously discussed, the oxygen vacancy can act as the anchoring site to stabilize the metal atom or cluster via bonding effect.…”

Section: Support With Oxygen Defect and Doped Atommentioning

confidence: 97%

Ultra-stable metal nano-catalyst synthesis strategy: a perspective

Cao

Zhou

et al. 2019

Rare Met.

Self Cite

View full text Add to dashboard Cite

Supported metal nanoparticles (NPs) as an important heterogeneous catalyst have been widely applied in various industrial processes. During the catalytic reaction, size of the particles plays an important role in determining their catalytic performance. Generally, the small particles exhibit superior catalytic activity in comparison with the larger particles because of an increase in lowcoordinated metal atoms on the particle surface that work as active sites, such as edges and corner atoms. However, these small NPs are typically unstable and tend to migrate and coalescence to reduce their surface free energy during the real catalytic processes, particularly in high-temperature reactions. Therefore, a means to fabricate stable small metal NP catalysts with excellent sinter-resistant performance is necessary for maintaining their high catalytic activity. In this study, we have summarized recent advances in stabilizing metal NPs from two aspects including thermodynamic and kinetic strategies. The former mainly involve preparing uniform NPs (with an identical size and homogeneous distribution) in order to restrain Ostwald ripening to achieve stability, while the latter primarily involves fixing metal NPs in some special confinement materials (e.g., zeolites, mesoporous silica and mesoporous carbons), encapsulating NPs using an oxide-coating film (e.g., forming core-shell structures), or constructing strong metal-support interactions to improve stability. At the end of this review, we highlight our recent work on the preparation of high-stability metal catalysts via a unique interfacial plasma electrolytic oxidation technology, that is, metal NPs are well embedded in a porous MgO layer that has both high thermal stability and excellent catalytic activity.

show abstract

Tuning orientation of doped hematite photoanodes for enhanced photoelectrochemical water oxidation

Cited by 52 publications

References 42 publications

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

A Novel Strategy for Fabricating a Strong Nanoparticle Monolayer and Its Enhanced Mechanism

Ultra-stable metal nano-catalyst synthesis strategy: a perspective

Contact Info

Product

Resources

About

Tuning orientation of doped hematite photoanodes for enhanced photoelectrochemical water oxidation

Cited by 52 publications

References 42 publications

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe2O3 Photoanode

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe2O3 Photoanode

A Novel Strategy for Fabricating a Strong Nanoparticle Monolayer and Its Enhanced Mechanism

Ultra-stable metal nano-catalyst synthesis strategy: a perspective

Contact Info

Product

Resources

About

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe₂O₃ Photoanode