• Title, Summary, Keyword: Photoelectrochemical hydrogen production

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Economic Evaluation of Domestic Photoelectrochemical Hydrogen Production (국내 광전기화학 수소생산의 경제성 평가)

  • Gim, Bong-Jin;Kim, Jong-Wook
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.1
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    • pp.64-71
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    • 2010
  • This paper deals with an economic evaluation of domestic immersing type photoelectrochemical hydrogen production. We also make some sensitivity analysis of hydrogen production prices by changing the values of input factors such as the initial capital cost, the solar to hydrogen conversion efficiency, and the system duration time. The hydrogen production price of the immersing type photoelectrochemical system was estimated as 8,264,324 won/$kgH_2$. It is expected that the production cost by photoelectrochemical hydrogen production can be reduced to 26,961 won/$kgH_2$ if the solar to hydrogen conversion efficiency is increased to 14%, the system duration time is increased to 20,000 hours, and the initial capital cost is decreased to 10% of the current level. The photoelectrochemical hydrogen production is evaluated as uneconomical at this time, and we need to enhance the solar to hydrogen conversion efficiency and the system duration time as well as to reduce prices of the system facilities.

Economic Evaluation of Domestic Window Type Photoelectrochemical Hydrogen Production Utilizing Solar Cells (태양전지를 이용한 국내 Window Type 광전기화학 수소생산의 경제성 평가)

  • Gim, Bong-Jin;Kim, Jong-Wook
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.6
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    • pp.595-603
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    • 2010
  • This paper deals with an economic evaluation of domestic window type photoelectrochemical hydrogen production utilizing solar cells. We make some sensitivity analysis of hydrogen production prices by changing the values of input factors such as the initial capital cost, the solar to hydrogen conversion efficiency, and the system duration time. The hydrogen production price of the window type photoelectrochemical system was estimated as 1,168,972 won/$kgH_2$. It is expected that hydrogen production cost can be reduced to 47,601 won/$kgH_2$ if the solar to hydrogen conversion efficiency is increased to 14%, the system duration time is increased to 20,000 hours, and the initial capital cost is decreased to 25% of the current level. We also evaluate the hydrogen production cost of the water electrolysis using the electricity produced by solar cells. The corresponding hydrogen production cost was estimated as 37,838 won/$kgH_2$. The photoelectrochemical hydrogen production is evaluated as uneconomical at this time, and we need to enhance the solar to hydrogen conversion efficiency and the system duration time as well as to reduce prices of the system facilities.

Effect of Reduced Graphene Oxide in Photoanode on Photoelectrochemical Performance in Water Splitting for Hydrogen Production (수소생산을 위한 물 분해용 광전극에 도입된 환원된 산화그래핀이 광전기화학성능에 미치는 영향)

  • YOON, SANGHYEOK;DING, JIN-RUI;KIM, KYO-SEON
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.4
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    • pp.329-334
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    • 2016
  • Hydrogen is eco-friendly alternative energy source and the photoelectrochemical water splitting is believed to be one of the promising methods for hydrogen production. Many researchers have studied several potential photocatalysts to increase the photoelectochemical performance efficiency for hydrogen conversion. In this study, the GO (graphene oxide) was prepared by Tour's method and was dispersed in precursor solutions of $WO_3$ and $BiVO_4$. Those precursor solutions were spin-coated on FTO glass and several photocatalyst thin films of $WO_3$, $BiVO_4$ and $WO_3/BiVO_4$ were prepared by calcination. The morphologies of prepared photocatalyst thin films were measured by scanning electron microscope. The photoelectrochemical performances of photocatalyst thin films with rGO (reduced graphene oxide) and without rGO were analyzed systematically.

Hydrogen Production by Photoelectrochemical Water Splitting

  • Seo, H.W.;Kim, J. S.
    • Applied Science and Convergence Technology
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    • v.27 no.4
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    • pp.75-78
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    • 2018
  • The basic principle and concept for hydrogen production via water-splitting process are introduced. In particular, recent research activities and their progress in the photoelectrochemical water-splitting process are investigated. The material perspectives of semiconducting photocatalysts are considered from metal oxides, including titanium oxides, to carbon compounds and perovskites. Various structural configurations, from conventional photoanodes with metal cathodes to tandem and nanostructures, are also studied. The pros and cons of each are described in terms of light absorption, charge separation/photoexcited electron-hole pair recombinations and further solar-to-hydrogen efficiency. In this research, we attempt to provide a broad view of up-to-date research and development as well as, possibly, future directions in the photoelectrochemical water-splitting field.

Fabrication of Metal-Semiconductor Interface in Porous Silicon and Its Photoelectrochemical Hydrogen Production

  • Oh, Il-Whan;Kye, Joo-Hong;Hwang, Seong-Pil
    • Bulletin of the Korean Chemical Society
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    • v.32 no.12
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    • pp.4392-4396
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    • 2011
  • Porous silicon with a complex network of nanopores is utilized for photoelectrochemical energy conversion. A novel electroless Pt deposition onto porous silicon is investigated in the context of photoelectrochemical hydrogen generation. The electroless Pt deposition is shown to improve the characteristics of the PS photoelectrode toward photoelectrochemical $H^+$ reduction, though excessive Pt deposition leads to decrease of photocurrent. Furthermore, it is found that a thin layer (< 10 ${\mu}m$) of porous silicon can serve as anti-reflection layer for the underlying Si substrate, improving photocurrent by reducing photon reflection at the Si/liquid interface. However, as the thickness of the porous silicon increases, the surface recombination on the dramatically increased interface area of the porous silicon begins to dominate, diminishing the photocurrent.

Photoelectrochemical Hydrogen Production on Textured Silicon Photocathode

  • Oh, Il-Whan
    • Journal of the Korean Electrochemical Society
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    • v.14 no.4
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    • pp.191-195
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    • 2011
  • Wet chemical etching methods were utilized to conduct Si surface texturing, which could enhance photoelectrochemical hydrogen generation rate. Two different etching methods tested, which were anisotropic metal-catalyzed electroless etching and isotropic etching. The Si nano-texture that was fabricated by the anisotropic etching showed ~25% increase in photocurrent for H2 generation. The photocurrent enhancement was attributed to the reduced reflection loss at the nano-textured Si surface, which provided a layer of intermediate density between water and the Si substrate.

Recent Developments in H2 Production Photoelectrochemical Electrode Materials by Atomic Layer Deposition (원자층증착법을 이용한 수소 생성용 광전기화학 전극 소재 개발 동향)

  • Han, Jeong Hwan
    • Journal of Korean Powder Metallurgy Institute
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    • v.25 no.1
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    • pp.60-68
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    • 2018
  • The design and fabrication of photoelectrochemical (PEC) electrodes for efficient water splitting is important for developing a sustainable hydrogen evolution system. Among various development approaches for PEC electrodes, the chemical vapor deposition method of atomic layer deposition (ALD), based on self-limiting surface reactions, has attracted attention because it allows precise thickness and composition control as well as conformal coating on various substrates. In this study, recent research progress in improving PEC performance using ALD coating methods is discussed, including 3D and heterojunction-structured PEC electrodes, ALD coatings of noble metals, and the use of sulfide materials as co-catalysts. The enhanced long-term stability of PEC cells by ALD-deposited protecting layers is also reviewed. ALD provides multiple routes to develop improved hydrogen evolution PEC cells.

Effect of Surface Treatment of CdS-TiO2 Composite Photocatalysts with Film Type on Hydrogen Production (수소제조에 관한 박막형 CdS-TiO2 복합 광촉매계의 표면처리 효과)

  • Jang, Jum-Suk;So, Won-Wook;Kim, Kwang-Je;Moon, Sang-Jin
    • Transactions of the Korean hydrogen and new energy society
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    • v.13 no.1
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    • pp.34-41
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    • 2002
  • CdS and $TiO_2$ nanoparticles were made by the precipitation method and sol-gel method, respectively, and they were mixed mechanically and then treated with the hydrothermal processing. CdS-$TiO_2$ composite particulate films were thus prepared by casting CdS-$TiO_2$ mixed sol onto $SnO_2$ conducting glass and a subsequent heat-treatment at $400^{\circ}C$. Again, the physico-chemical and photoelectrochemical properties of these films were controlled by the surface treatment with $TiCl_4$ aqueous solution. The photocurrents and the hydrogen production rates measured under the present experimental conditions varied in the range of $3.5{\sim}4.5mA/cm^2$ and $0.3{\sim}1.8cc/cm^2$-hr, respectively, and showed the maximum values at the $CdS/[CdS+TiO_2]$ mole ratio of 0.2. Also, the surface treatment with $TiCl_4$ aqueous solution caused a considerable improvement in the photocatalytic activity, Probably as a result of close contacts between the primary particles by the etching effect of $TiCl_4$ It was found that the photoelectrochemical performance of these particulate films could be effectively enhanced by this approach.

Photocatalytic Degradation of MB with One-body Photoanode (일체형 포토어노드를 활용한 메틸렌블루의 분해)

  • Shim, Eun-Jung;Bae, Sang-Hyun;Yoon, Jae-Kyung;Joo, Hyun-Ku
    • Transactions of the Korean hydrogen and new energy society
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    • v.18 no.1
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    • pp.40-45
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    • 2007
  • Methylene blue(MB) was photocatalytically degraded with one-body photoanode and solar simulator to investigate the possible application to both environmental purification and photoelectrochemical cell for hydrogen production. Photoactive titanium dioxide was formed on both sides of Ti plate following steps such as rinsing-annealing-calcination or anodizing(20 V, 30 V)-annealing($350^{\circ}C$, $450^{\circ}C)$ after etching. The prepared titania plate($2cm{\times}2\;cm$, ca 1.6 mg $TiO_2$ on the basis of $1\;{\mu}m$ thickness) was used to degrade MB(10 ppm in 200 mL solution). The reaction tended to follow the Langmuir-Hinshelwood kinetics with zero order. Comparative experiments with Degussa P25 showed the same zero order kinetics when 2 mg of P25 had been used, while the first order kinetics when 200 mg used. This concludes the feasibility of the prepared titania plate as a material for the purification of low-level harmful organics and an electrode or a membrane for photoelectrochemical system for hydrogen production.