A unique approach for high performance photoelectrochemical water splitting: Utilizing coating and doping methods

Azad, Aryan; Kim, Sun Jae

doi:10.1016/j.materresbull.2016.08.033

Cited by 3 publications

(2 citation statements)

References 31 publications

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“… Graphical visualization of photocurrent density (a), and onset potential (b) of some selected α‐Fe 2 O 3 photoanode assisted PEC water oxidation systems as summarized in Table S1 of the Supporting Information . The color code signifies the different modification strategies as noted.…”

Section: New Strategies To Enhance the Performance Of α‐Fe2o3 Photoanodementioning

confidence: 99%

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

2018

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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.

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Section: New Strategies To Enhance the Performance Of α‐Fe2o3 Photoanodementioning

confidence: 99%

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

2018

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“…Electrolysis driven by electricity or heat from nuclear power plants produces no carbon based waste but creates new problems from the management of radioactive waste products [34]. Research into photocatalytic and photoelectric hydrogen production from water is beginning to produce results [35][36][37][38][39].…”

Section: Hydrogen As An Energy Carriermentioning

confidence: 99%

Hydrogen from Ammonia by Catalytic Spillover Membrane

Tailby¹

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<p>One of the major challenges to be overcome before hydrogen fuelled vehicles can become commonplace is to store hydrogen with sufficient storage density to be practical. One approach to overcoming this challenge involves converting the hydrogen into a secondary fuel that can be stored more easily, such as ammonia. This introduces the challenge of efficiently retrieving the hydrogen from the secondary fuel with sufficient purity to be used in a polymer electrolyte membrane fuel cell. Putting the hydrogen producing reaction inside a membrane which is capable of filtering out hydrogen creates a membrane reactor which can increase hydrogen purity and can accelerate the reaction both kinetically and thermodynamically. The most effective materials currently known for hydrogen membranes are high palladium alloys of copper and silver. These are able to absorb hydrogen on the side with high hydrogen partial pressure and desorb that hydrogen on the side with low hydrogen pressure. Palladium metal is also able to interact with some catalysts by hydrogen spillover. Hydrogen is transported from the surface of the catalyst to the palladium surface more quickly than the hydrogen can desorb from the catalyst, this potentially accelerates both the catalysis and the hydrogen filtration. This research aimed to create a catalytic spillover membrane to extend the possibility of ammonia as a secondary fuel for hydrogen transport. In this research, several methods to produce a nickel catalyst on the surface of the palladium were explored: electrodeposition with and without a lithographic template; spray coating with nanoparticles; and preshaped nickel mesh and nickel foam. These potential catalysts were tested for ammonia decomposition. Templated electrodeposition created the most effective catalyst, but the nickel foam was most easily applied to the next stage of the research. The nickel foam catalyst was subsequently retested for ammonia decomposition in three scenarios: in contact with palladium foil; in a reactor with a palladium membrane; and in contact with a palladium membrane. The presence of a palladium membrane improved decomposition more than spillover contact between nickel foam catalyst and palladium, however, the combination of spillover contact with a palladium membrane increased the ammonia decomposition further. The rate of hydrogen flux through the palladium membranes was calculated for the experimental results. These were compared to flux values predicted by a model equation. The results showed that spillover contact between nickel catalyst and palladium membrane increased the hydrogen flux through the membrane.. The research outcomes have generated new knowledge and improved understanding of the morphology and role of nickel catalysts in accelerating ammonia decomposition. The research highlights the complex relationship between reactor design, gas flow paths, catalyst presentation and catalysis chemistry, suggesting promising areas for future research.</p>

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Self-surface-passivation of titanium doped hematite photoanode for efficient solar water and formaldehyde oxidation

Zheng

et al. 2017

Materials Research Bulletin

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A unique approach for high performance photoelectrochemical water splitting: Utilizing coating and doping methods

Cited by 3 publications

References 31 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

Hydrogen from Ammonia by Catalytic Spillover Membrane

Self-surface-passivation of titanium doped hematite photoanode for efficient solar water and formaldehyde oxidation

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A unique approach for high performance photoelectrochemical water splitting: Utilizing coating and doping methods

Cited by 3 publications

References 31 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

Hydrogen from Ammonia by Catalytic Spillover Membrane

Self-surface-passivation of titanium doped hematite photoanode for efficient solar water and formaldehyde oxidation

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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