Drastic improvement in photoelectrochemical water splitting performance over prolonged reaction time using new carrier-guiding semiconductor nanostructures

Noh, Siyun; Song, Ji-Hoon; Han, Sangmoon; Shin, Jaehyeok; Yu, Yeon–Tae

doi:10.1039/d2ta01711c

Cited by 11 publications

(4 citation statements)

References 60 publications

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“…Up to date, various attempts have been made to use III‐nitride semiconductors for the application of PEC water splitting. While the previous works improved the efficiency and stability to some extent through engineering of III‐nitirde photoelectrodes, [ 19 ] research at the interface between III‐nitride and its impact on stability is still unexplored, especially under concentrated solar light. Therefore, based on the performance variation of Pt/GaN/Si, the following protocol is proposed for evaluating the stability of PEC water splitting using concentrated solar light.…”

Section: Resultsmentioning

confidence: 99%

Concentrated Solar Light Photoelectrochemical Water Splitting for Stable and High‐Yield Hydrogen Production

Dong,

Ye,

Tang

et al. 2024

Advanced Science

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Photoelectrochemical water splitting is a promising technique for converting solar energy into low‐cost and eco‐friendly H2 fuel. However, the production rate of H2 is limited by the insufficient number of photogenerated charge carriers in the conventional photoelectrodes under 1 sun (100 mW cm−2) light. Concentrated solar light irradiation can overcome the issue of low yield, but it leads to a new challenge of stability because the accelerated reaction alters the surface chemical composition of photoelectrodes. Here, it is demonstrated that loading Pt nanoparticles (NPs) on single crystalline GaN nanowires (NWs) grown on n+‐p Si photoelectrode operates efficiently and stably under concentrated solar light. Although a large number of Pt NPs detach during the initial reaction due to H2 gas bubbling, some Pt NPs which have an epitaxial relation with GaN NWs remain stably anchored. In addition, the stability of the photoelectrode further improves by redepositing Pt NPs on the reacted Pt/GaN surface, which results in maintaining onset potential >0.5 V versus reversible hydrogen electrode and photocurrent density >60 mA cm−2 for over 1500 h. The heterointerface between Pt cocatalysts and single crystalline GaN nanostructures shows great potential in designing an efficient and stable photoelectrode for high‐yield solar to H2 conversion.

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Section: Resultsmentioning

confidence: 99%

Concentrated Solar Light Photoelectrochemical Water Splitting for Stable and High‐Yield Hydrogen Production

Dong,

Ye,

Tang

et al. 2024

Advanced Science

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“…The ABPE, a function of bias voltage derived from a threeelectrode system, represents the photoconversion efficiency at applied voltages of the photoelectrode minus the contribution of the applied voltage, as calculated using Equation (4) [20,21] ABPE = J ph ( 1.23 − V app ) ∕P light (4) where V app is the applied voltage (V RHE ), J ph is the photocurrent density (mA cm −2 ), and P light is the illumination power density of the simulated sunlight (100 mW cm −2 ). IPCE and APCE are measured at a constant voltage and represent incident monochromatic photon-to-photocurrent efficiency and absorbed monochromatic photon-to-photocurrent efficiency, respectively.…”

Section: Parameters For Photoelectrode Performancementioning

confidence: 99%

“…[3] Like photocatalysis, photoelectrochemical (PEC) reactions can convert solar energy into chemical energy by harvesting sunlight, thereby generating, separating, and transferring electron-hole pairs on photoelectrodes. [4,5] The conversion of solar energy into hydrogen energy is a PEC catalytic reaction carried out in a PEC cell, a functional battery based on the behavior of the photoelectrode and electrolyte interface. [6] As illustrated in Figure 1a, the PEC water splitting cell comprises a photoanode, photocathode, electrolyte, and external circuit.…”

Section: Introductionmentioning

confidence: 99%

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Optical and Electrical Modulation Strategies of Photoelectrodes for Photoelectrochemical Water Splitting

Tian

Yang

et al. 2023

Small Methods

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When constructing efficient, cost‐effective, and stable photoelectrodes for photoelectrochemical (PEC) systems, the solar‐driven photo‐to‐chemical conversion efficiency of semiconductors is limited by several factors, including the surface catalytic activity, light absorption range, carrier separation, and transfer efficiency. Accordingly, various modulation strategies, such as modifying the light propagation behavior and regulating the absorption range of incident light based on optics and constructing and regulating the built‐in electric field of semiconductors based on carrier behaviors in semiconductors, are implemented to improve the PEC performance. Herein, the mechanism and research advancements of optical and electrical modulation strategies for photoelectrodes are reviewed. First, parameters and methods for characterizing the performance and mechanism of photoelectrodes are introduced to reveal the principle and significance of modulation strategies. Then, plasmon and photonic crystal structures and mechanisms are summarized from the perspective of controlling the propagation behavior of incident light. Subsequently, the design of an electrical polarization material, polar surface, and heterojunction structure is elaborated to construct an internal electric field, which serves as the driving force to facilitate the separation and transfer of photogenerated electron–hole pairs. Finally, the challenges and opportunities for developing optical and electrical modulation strategies for photoelectrodes are discussed.

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Atomic‐Precision Manipulation of Defects in RuO₂ Nanocrystals via Electron‐Beam

Li,

Zou,

Wang

et al. 2024

Adv Funct Materials

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Manufacturing nanocrystals with desired structures is the basis for realizing designed properties in their applications. As an important top‐down fabrication technique, although electron beam (e‐beam) has been well used for atomic etching on one hand, it is still challenging to precisely repair the undesired crystal defects on the other. Herein, utilizing the e‐beam probe in a spherical aberration‐corrected scanning transmission electron microscope, the possibility of e‐beam in the atomic‐level‐controllable construction/repair of crystalline defects in ruthenium oxide (RuO2) nanocrystals is systematically explored. It is found that the functional duality of beam effects can be well controlled, with the domination of either constructing or repairing defects in atomic scale, by tuning e‐beam parameters. With the aid of real‐time observation of the atom‐by‐atom repairing process via in situ scanning transmission electron microscopy and density functional theory calculations, the e‐beam‐assisted repairing mechanism is revealed. This work is anticipated to provide insights into controllable top‐down manufacturing nanomaterials at the sub‐nanoscale by e‐beam.

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Drastic improvement in photoelectrochemical water splitting performance over prolonged reaction time using new carrier-guiding semiconductor nanostructures

Abstract: The performance of photoelectrochemical water splitting (PEC-WS) over time was drastically improved using new carrier-guiding semiconductor nanostructures, namely InGaN/GaN core-shell nanowires (CSNWs) with a protruding core, as a photocathode (PC)...

Cited by 11 publications

References 60 publications

Concentrated Solar Light Photoelectrochemical Water Splitting for Stable and High‐Yield Hydrogen Production

Concentrated Solar Light Photoelectrochemical Water Splitting for Stable and High‐Yield Hydrogen Production

Optical and Electrical Modulation Strategies of Photoelectrodes for Photoelectrochemical Water Splitting

Atomic‐Precision Manipulation of Defects in RuO₂ Nanocrystals via Electron‐Beam

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Drastic improvement in photoelectrochemical water splitting performance over prolonged reaction time using new carrier-guiding semiconductor nanostructures

Abstract: The performance of photoelectrochemical water splitting (PEC-WS) over time was drastically improved using new carrier-guiding semiconductor nanostructures, namely InGaN/GaN core-shell nanowires (CSNWs) with a protruding core, as a photocathode (PC)...

Cited by 11 publications

References 60 publications

Concentrated Solar Light Photoelectrochemical Water Splitting for Stable and High‐Yield Hydrogen Production

Concentrated Solar Light Photoelectrochemical Water Splitting for Stable and High‐Yield Hydrogen Production

Optical and Electrical Modulation Strategies of Photoelectrodes for Photoelectrochemical Water Splitting

Atomic‐Precision Manipulation of Defects in RuO2 Nanocrystals via Electron‐Beam

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Atomic‐Precision Manipulation of Defects in RuO₂ Nanocrystals via Electron‐Beam