Development and experimental study for hydrogen production from the thermochemical two-step water splitting cycles with a CeO2 coated new foam device design using solar furnace system

Cho, Hyun seok; Kodama, Tetsuya; Gokon, Nobuyuki; Kim, Jong Kyu; Lee, Sang nam; Kang, Yong-Heack

doi:10.1063/1.4984460

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…RPC foams can be made in other, more complex shapes as well, such as the conical piece (a magnesium stabilized zirconia foam coated with 40 wt% ceria) made from 4 sections shown in Figure 11, which was successfully used to split water using actual concentrated sunlight (Cho et al, 2017).…”

Section: Reticulated Ceria Foamsmentioning

confidence: 99%

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A Review of Solar Thermochemical CO2 Splitting Using Ceria-Based Ceramics With Designed Morphologies and Microstructures

et al. 2019

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This review explores the advances in the synthesis of ceria materials with specific morphologies or porous macro- and microstructures for the solar-driven production of carbon monoxide (CO) from carbon dioxide (CO2). As the demand for renewable energy and fuels continues to grow, there is a great deal of interest in solar thermochemical fuel production (STFP), with the use of concentrated solar light to power the splitting of carbon dioxide. This can be achieved in a two-step cycle, involving the reduction of CeO2 at high temperatures, followed by oxidation at lower temperatures with CO2, splitting it to produce CO, driven by concentrated solar radiation obtained with concentrating solar technologies (CST) to provide the high reaction temperatures of typically up to 1,500°C. Since cerium oxide was first explored as a solar-driven redox material in 2006, and to specifically split CO2 in 2010, there has been an increasing interest in this material. The solar-to-fuel conversion efficiency is influenced by the material composition itself, but also by the material morphology that mostly determines the available surface area for solid/gas reactions (the material oxidation mechanism is mainly governed by surface reaction). The diffusion length and specific surface area affect, respectively, the reduction and oxidation steps. They both depend on the reactive material morphology that also substantially affects the reaction kinetics and heat and mass transport in the material. Accordingly, the main relevant options for materials shaping are summarized. We explore the effects of microstructure and porosity, and the exploitation of designed structures such as fibers, 3-DOM (three-dimensionally ordered macroporous) materials, reticulated and replicated foams, and the new area of biomimetic/biomorphous porous ceria redox materials produced from natural and sustainable templates such as wood or cork, also known as ecoceramics.

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Section: Reticulated Ceria Foamsmentioning

confidence: 99%

“…The three holes are for the insertion of thermocouples. From Cho et al (2017), used with permission of AIP publishing.…”

Section: Reticulated Ceria Foamsmentioning

confidence: 99%

A Review of Solar Thermochemical CO2 Splitting Using Ceria-Based Ceramics With Designed Morphologies and Microstructures

et al. 2019

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“…The initial reactor was a direct heating-type reactor, which used a quartz window, as shown in Figure 5. It also had a similar structure as the reactor used in the experiment where water splitting was previously performed using a catalyst coated with CeO 2 [28]. To ensure that the inside of the reactor was uniformly heated, and the residence time was ensured, the conical silicon carbide (SIC) structure was placed inside the reactor to monitor the distribution of heat quantity based on the focal length.…”

Section: Direct Heating Reactormentioning

confidence: 99%

Hydrogen Production in Methane Decomposition Reactor Using Solar Thermal Energy

Kim

et al. 2021

Applied Sciences

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This study investigates the decomposition of methane using solar thermal energy as a heat source. Instead of the direct thermal decomposition of the methane at a temperature of 1200 °C or higher, a catalyst coated with carbon black on a metal foam was used to lower the temperature and activation energy required for the reaction, and to increase the yield. To supply solar heat during the reaction, a reactor suitable for a solar concentrating system was developed. In this process, a direct heating type reactor with quartz was initially applied, and a number of problems were identified. An indirect heating type reactor with an insulated cavity and a rotating part was subsequently developed, followed by a thermal barrier coating application. Methane decomposition experiments were conducted in a 40 kW solar furnace at the Korea Institute of Energy Research. Conversion rates of 96.7% and 82.6% were achieved when the methane flow rate was 20 L/min and 40 L/min, respectively.

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“…Despite the huge CeO 2 potential in thermochemical cycles, high reduction temperature (step1), compromising long-term thermal stability over multiple cycles as well as small fuel production still limits its technological application. To date, a number of other studies have addressed these issues (Kaneko et al, 2011;Petkovich et al, 2011;Gokon et al, 2013Gokon et al, , 2015aAgrafiotis et al, 2015;Jarrett et al, 2016;Muhich et al, 2016;Al-Shankiti et al, 2017;Cho et al, 2017;Zhou et al, 2017;Luciani et al, 2019;Bhosale and AlMomani, 2020;Costa Oliveira et al, 2020;Haeussler et al, 2020). Modifying ceria fluorite structure with metal cations has proved to be a successful strategy for improving both oxygen ion mobility and thermal stability, ultimately enhancing the redox activity of the material (Kang et al, 2013;Cooper et al, 2015;Gokon et al, 2015a,b;Takacs et al, 2015;Bhosale et al, 2016;Lin et al, 2016;Zhao et al, 2016;Mostrou et al, 2017;Muhich and Steinfeld, 2017;Bhosale and Takalkar, 2018;Takalkar et al, 2018Takalkar et al, , 2020aNaghavi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Syngas Production Through H2O/CO2 Thermochemical Splitting Over Doped Ceria-Zirconia Materials

2020

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This study investigates the catalytic properties of K + and Cu 2+ /Fe 3+ co-doped ceriazirconia (CeZr) toward water and carbon dioxide co-splitting. These materials can convert separate feeds of CO 2 and H 2 O into CO and H 2. In co-splitting tests, water reacts faster on the K-Cu-CeZr catalyst with negligible CO production. The reduction of the K-Fe-CeZr catalyst occurs over two broad temperature ranges: at low temperature, only H 2 is produced; whereas CO is the most abundant product at high temperature. A kinetic model was developed to get insights into the reasons of the observed selectivity toward H 2 at low temperature and CO at a higher temperature. The different reaction orders in the sites fraction were evaluated for CO 2 and H 2 O reactions, highlighting that H 2 production requires a larger number of adjacent reduced sites than CO production. Three regimes were identified through the model: Regime I-H 2 O driven regime @T ≤ 650 • C; Regime II-mixed regime @ 560 < T < 700 • C and Regime III: CO 2 driven regime @ T > 700 • C. These results indicate the appropriate conditions for tuning H 2 /CO selectivity, depending on the feed composition.

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Development and experimental study for hydrogen production from the thermochemical two-step water splitting cycles with a CeO2 coated new foam device design using solar furnace system

Cited by 5 publications

References 15 publications

A Review of Solar Thermochemical CO2 Splitting Using Ceria-Based Ceramics With Designed Morphologies and Microstructures

A Review of Solar Thermochemical CO2 Splitting Using Ceria-Based Ceramics With Designed Morphologies and Microstructures

Hydrogen Production in Methane Decomposition Reactor Using Solar Thermal Energy

Syngas Production Through H2O/CO2 Thermochemical Splitting Over Doped Ceria-Zirconia Materials

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