Atomic-scale platinum deposition on photocathodes by multiple redox cycles under illumination for enhanced solar-to-hydrogen energy conversion

Choi, Ji Hoon; Kim, Dong Su; Sarker, Swagotom; Lee, Hak Hyeon; Suh, Hee Won; Jung, Soyoung; Lee, Kun Woong; Lee, Ho Seong; Cho, Hyung Koun

doi:10.1016/j.jpowsour.2022.231410

Cited by 7 publications

(4 citation statements)

References 43 publications

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“…In the initial step, a 200 nm layer of Sb-doped Cu 2 O (Sb–Cu 2 O) was deposited onto an ITO substrate and an undoped Cu 2 O layer of 800 nm was continuously electrodeposited. Here, the first Sb–Cu 2 O layer led to the enhanced crystallinity of the Cu 2 O overlayer and effectively played a role as a conductive hole transport layer . Then, atomic layer deposition (ALD) was conducted to coat n-type Al-doped ZnO (AZO) and TiO 2 thin layers as an electron transport layer and protection layer, respectively. , …”

Section: Resultsmentioning

confidence: 99%

“…The PRoD method demonstrated iterative reduction (adsorption) and oxidation (desorption) steps of Rh 2 P catalysts, and we ascertained the optimal NP performance/size ratio by loading an ultralow catalyst amount and maximizing the exposed surface area. In addition, we evaluated the PEC operation stability under various acidic conditions (pH 1−4) and the optimized Rh 2 P/TiO 2 /AZO/Cu 2 O/Sb− Cu 2 O/ITO photocathode achieved a photocurrent density of 44 Then, atomic layer deposition (ALD) was conducted to coat n-type Al-doped ZnO (AZO) and TiO 2 thin layers as an electron transport layer and protection layer, respectively. 1,15 One promising approach to enhance the STH efficiency in PEC development is to operate a water-splitting reaction in an acidic electrolyte.…”

Section: ■ Introductionmentioning

confidence: 99%

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Photoilluminated Redox-Processed Rh₂P Nanoparticles on Photocathodes for Stable Hydrogen Production in Acidic Environments

Choi,

Lee,

Jeon

et al. 2024

ACS Appl. Mater. Interfaces

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While photoelectrochemical (PEC) cells show promise for solar-driven green hydrogen production, exploration of various light-absorbing multilayer coatings has yet to significantly enhance their hydrogen generation efficiency. Acidic conditions can enhance the hydrogen evolution reaction (HER) kinetics and reduce overpotential losses. However, prolonged acidic exposure deactivates noble metal electrocatalysts, hindering their long-term stability. Progress requires addressing catalyst degradation to enable stable, efficient, and acidic PEC cells. Here, we proposed a process design based on the photoilluminated redox deposition (PRoD) approach. We use this to grow crystalline Rh 2 P nanoparticles (NPs) with a size of 5−10 on 30 nm-thick TiO 2 , without annealing. Atomically precise reaction control was performed by using several cyclic voltammetry cycles coincident with light irradiation to create a system with optimal catalytic activity. The optimized photocathode, composed of Rh 2 P/TiO 2 /Al−ZnO/Cu 2 O/Sb−Cu 2 O/ITO, achieved an excellent photocurrent density of 8.2 mA cm −2 at 0 V RHE and a durable water-splitting reaction in a strong acidic solution. Specifically, the Rh 2 P-loaded photocathode exhibited a 5.3-fold enhancement in mass activity compared to that utilizing just a Rh catalyst. Furthermore, in situ scanning transmission electron microscopy (STEM) was performed to observe the real-time growth process of Rh 2 P NPs in a liquid cell.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Photoilluminated Redox-Processed Rh₂P Nanoparticles on Photocathodes for Stable Hydrogen Production in Acidic Environments

Choi,

Lee,

Jeon

et al. 2024

ACS Appl. Mater. Interfaces

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“…The apex of the semicircle points of a normalized IMPS was used in the sum of charge transfer rate and recombination rate (k trans + k rec ). The ratio between the low-frequency intercept (LFI) and highfrequency intercept (HFI) denotes the charge transfer efficiency as shown in Equations ( 9)-( 11): [11,41] Transfer efficiency…”

Section: Component Analysis and Performance Of Photoelectrodes Suitab...mentioning

confidence: 99%

“…These include crystal quality improvement, surface morphology control, doping, and co-catalyst deposition. [9][10][11] Among the p-type oxide semiconductors, Cu 2 O has a higher conduction band position than the hydrogen evolution reaction (HER) water splitting potential and a suitable bandgap (2.1 eV). It has a theoretical photocurrent of 14.7 mA cm À 2 at 0 V RHE and solar-to-hydrogen conversion efficiency of 18 %.…”

Section: Introductionmentioning

confidence: 99%

Alkali Cation Engineered Chemical Self‐Oxidation of Copper Oxide Nanowire‐Based Photocathodes

et al. 2022

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Hydrogen energy production through photoelectrochemical (PEC) water splitting has great potential in the field of renewable energy. This study focuses on the hydration enthalpy difference of cations (Li+, Na+, and K+) in an aqueous solution for the chemical self‐oxidation process without an external applied bias. The thickness of the cation/H2O double layer is controlled. The starting materials are low‐cost copper foil and the synthesis uses alkali cation‐engineered chemical self‐oxidation. Li+ ions are strongly attracted to water molecules. This forms a sufficient OH− layer on the Cu foil surface. By accelerating the oxidation reaction, a large surface area of Cu(OH)x nanowires (NWs) with high purity and a uniform shape are obtained. This optimal p‐type Cu2O NWs photocathode is CuO‐free, has the highest conductivity, and is fabricated through phase transition using precise vacuum annealing. The other alkali cations produce the Cu2O/CuO mixed or CuO phases that degrade the PEC performances with severe corrosive reactions. The Cu/Li : Cu2O/AZO/TiO2/Pt photocathode has a 50 h stability with a photocurrent density of 8.4 mA cm−2 at 0 VRHE. The fabricated photoelectrode did not structurally collapse after stability measurements during this period. The captured hydrogen production was in agreement with the calculated faradaic efficiency.

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Particle‐Based Photoelectrodes for PEC Water Splitting: Concepts and Perspectives

Liu,

Kuang

2024

Advanced Materials

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This comprehensive review delves into the intricacies of the photoelectrochemical (PEC) water splitting process, specifically focusing on the design, fabrication, and optimization of particle‐based photoelectrodes for efficient green hydrogen production. These photoelectrodes, composed of semiconductor materials, potentially harness light energy and generate charge carriers, driving water oxidation and reduction reactions. The versatility of particle‐based photoelectrodes as a platform for investigating and enhancing various semiconductor candidates is explored, particularly the emerging complex oxides with compelling charge transfer properties. However, the challenges presented by many factors influencing the performance and stability of these photoelectrodes, including particle size, shape, composition, morphology, surface modification, and electrode configuration, are highlighted. The review introduces the fundamental principles of semiconductor photoelectrodes for PEC water splitting, presents an exhaustive overview of different synthesis methods for semiconductor powders and their assembly into photoelectrodes, and discusses recent advances and challenges in photoelectrode material development. It concludes by offering promising strategies for improving photoelectrode performance and stability, such as the adoption of novel architectures and heterojunctions.This article is protected by copyright. All rights reserved

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Atomic-scale platinum deposition on photocathodes by multiple redox cycles under illumination for enhanced solar-to-hydrogen energy conversion

Cited by 7 publications

References 43 publications

Photoilluminated Redox-Processed Rh₂P Nanoparticles on Photocathodes for Stable Hydrogen Production in Acidic Environments

Photoilluminated Redox-Processed Rh₂P Nanoparticles on Photocathodes for Stable Hydrogen Production in Acidic Environments

Alkali Cation Engineered Chemical Self‐Oxidation of Copper Oxide Nanowire‐Based Photocathodes

Particle‐Based Photoelectrodes for PEC Water Splitting: Concepts and Perspectives

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Atomic-scale platinum deposition on photocathodes by multiple redox cycles under illumination for enhanced solar-to-hydrogen energy conversion

Cited by 7 publications

References 43 publications

Photoilluminated Redox-Processed Rh2P Nanoparticles on Photocathodes for Stable Hydrogen Production in Acidic Environments

Photoilluminated Redox-Processed Rh2P Nanoparticles on Photocathodes for Stable Hydrogen Production in Acidic Environments

Alkali Cation Engineered Chemical Self‐Oxidation of Copper Oxide Nanowire‐Based Photocathodes

Particle‐Based Photoelectrodes for PEC Water Splitting: Concepts and Perspectives

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Product

Resources

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Photoilluminated Redox-Processed Rh₂P Nanoparticles on Photocathodes for Stable Hydrogen Production in Acidic Environments

Photoilluminated Redox-Processed Rh₂P Nanoparticles on Photocathodes for Stable Hydrogen Production in Acidic Environments