Enhanced water splitting performance of GaN photoanode using self-assembled nickel/nickel-oxide nanoparticle catalyst

Yeh, Yen-Hsien; Yu, Tzu‐Yi; Liu, Meichun; Cheng, Yuh-Jen

doi:10.1016/j.ijhydene.2017.09.108

Cited by 10 publications

(8 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, compared with single cocatalysts, dual cocatalysts [195,[254][255][256][257] tend to possess different functions, hence they usually emerge superiorities of higher PEC water oxidation performance due to synergetic effects caused by their interactions. However, compared with single cocatalysts, dual cocatalysts [195,[254][255][256][257] tend to possess different functions, hence they usually emerge superiorities of higher PEC water oxidation performance due to synergetic effects caused by their interactions.…”

Section: Dual Cocatalystsmentioning

confidence: 99%

“…Thus far, most related studies concentrate on the roles of single cocatalysts for PEC water oxidation, while few about dual cocatalysts have been reported. However, compared with single cocatalysts, dual cocatalysts tend to possess different functions, hence they usually emerge superiorities of higher PEC water oxidation performance due to synergetic effects caused by their interactions . For example, it is reported that a FeOOH and Au dual cocatalytic system helps α‐Fe 2 O 3 become one of the photoanodes with highest PEC performance ever reported for water oxidation ( Figure a) .…”

Section: Cocatalysts For Photoanodes: Construction and Regulationmentioning

confidence: 99%

See 1 more Smart Citation

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

et al. 2018

View full text Add to dashboard Cite

Photo‐electrochemical (PEC) water splitting, as an essential and indispensable research branch of solar energy applications, has achieved increasing attention in the past decades. Between the two photoelectrodes, the photoanodes for PEC water oxidation are mostly studied for the facile selection of n‐type semiconductors. Initially, the efficiency of the PEC process is rather limited, which mainly results from the existing drawbacks of photoanodes such as instability and serious charge‐carrier recombination. To improve PEC performances, researchers gradually focus on exploring many strategies, among which engineering photoelectrodes with suitable cocatalysts is one of the most feasible and promising methods to lower reaction obstacles and boost PEC water splitting ability. Here, the basic principles, modules of the PEC system, evaluation parameters in PEC water oxidation reactions occurring on the surface of photoanodes, and the basic functions of cocatalysts on the promotion of PEC performance are demonstrated. Then, the key progress of cocatalyst design and construction applied to photoanodes for PEC oxygen evolution is emphatically introduced and the influences of different kinds of water oxidation cocatalysts are elucidated in detail. Finally, the outlook of highly active cocatalysts for the photosynthesis process is also included.

show abstract

Section: Dual Cocatalystsmentioning

confidence: 99%

Section: Cocatalysts For Photoanodes: Construction and Regulationmentioning

confidence: 99%

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

et al. 2018

View full text Add to dashboard Cite

show abstract

“…This has been demonstrated experimentally using nanoparticles attached to a carbon nanotube network (Gong et al 2014). Partly oxidized Ni nanoparticles can also be used for photocatalytic hydrogen generation (Yeh et al 2017). Common to all of these applications, the partially oxidized nanoparticles display the best results.…”

Section: Introductionmentioning

confidence: 99%

Growth of semi-coherent Ni and NiO dual-phase nanoparticles using hollow cathode sputtering

et al. 2019

View full text Add to dashboard Cite

Anisotropic heterogenous Ni/NiO nanoparticles with controlled compositions are grown using a high-power pulsed hollow cathode process. These novel particles can be tuned to consist of single-phase Ni via twophase Ni/NiO to fully oxidized NiO, with a size range of 5-25 nm for individual crystals. A novelty of this approach is the ability to assemble multiple particles of Ni and NiO into a single complex structure, increasing the Ni-NiO interface density. This type of particle growth is not seen before and is explained to be due to the fact that the process operates in a single-step approach, where both Ni and O can arrive at the formed nanoparticle nuclei and aid in the continuous particle growth. The finished particle will then be a consequence of the initially formed crystal, as well as the arrival rate ratio of the two species. These particles hold great potential for applications in fields, such as electroand photocatalysis, where the ability to control the level of oxidation and/or interface density is of great importance.

show abstract

“…For instance, some groups reported that the III–V photoelectrodes integrated with solar cells could demonstrate extremely high solar-to-hydrogen efficiency. − III-nitride semiconductors, especially Ga x In 1– x N ( E g : 3.4–0.7 eV), can harvest the entire visible light spectrum by controlling the ratio of gallium and indium. − The low indium-containing Ga x In 1– x N possesses suitable band edge positions. This characteristic makes it possible to use the Ga x In 1– x N-based photoelectrodes to drive the overall water splitting under sunlight illumination. − Although the III-nitride semiconductors grown by metal–organic chemical vapor deposition (MOCVD) possess high crystal quality, the PEC performances using the III-nitride-based photoelectrodes still suffer from severe bulk recombination and photocorrosion. In order to minimize the recombination losses, utilizing the geometry structure with lateral size less than the diffusion length of the minority carriers of GaN for PEC water splitting has been studied by several groups. − The nanostructure of GaN photoelectrodes benefit the extraction of the photogenerated carriers, while the drawback is the extra photovoltage loss induced by the excess surface area and/or defects. , Another strategy to address the charge recombination is applying a p–n junction on the photoelectrodes.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from the bulk recombination losses, the other issue of the III-nitride photoanodes is photocorrosion. Many research groups suggested introducing the water oxidation catalysts (WOCs) to the GaN photoanodes to prevent surface corrosion. − Hayashi and Kim et al reported that the GaN photoanodes could be protected by the NiO nanoparticles (NPs), which were transferred to the surface of the electrode by spin-coating. , Yeh et al creatively introduced a hole depletion region to eliminate the accumulated holes in the GaN photoanodes by depositing the Ni/NiO x core–shell NPs on its surface . Koike et al investigated the stability of the NiO-decorated GaN photoanodes in acid and alkaline electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Stable Photoelectrochemical Water Splitting Using p–n GaN Junction Decorated with Nickel Oxides as Photoanodes

et al. 2021

View full text Add to dashboard Cite

Photoelectrochemical water splitting is a promising method of generating solar fuels. However, the direct solar-to-fuel approach has several critical issues on the photoelectrodes, such as bulk recombination, sluggish surface reaction kinetics, and photocorrosion. In this study, the photoanodes were prepared using a GaN p−n junction (p−n GaN) with the decoration of nickel oxide formed by the thermally annealed nickel film on the p-GaN surface layer. The surface p−n junction enhances the charge separation of the p−n GaN photoanodes, thereby increasing the photocurrent density as well as providing a higher photovoltage. The nickel oxide catalysts placed on the pn-GaN photoanodes lowered the activation energy and provided a facile route for the photogenerated holes to participate in water oxidation. As a result, the nickel oxide-decorated p−n junction GaN photoanodes exhibit a stable photocurrent density with negligible photocorrosion during the photoelectrochemical reactions.

show abstract

Enhanced water splitting performance of GaN photoanode using self-assembled nickel/nickel-oxide nanoparticle catalyst

Cited by 10 publications

References 34 publications

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

Growth of semi-coherent Ni and NiO dual-phase nanoparticles using hollow cathode sputtering

Stable Photoelectrochemical Water Splitting Using p–n GaN Junction Decorated with Nickel Oxides as Photoanodes

Contact Info

Product

Resources

About