Integrative techno-economic and environmental assessment for green H2 production by alkaline water electrolysis based on experimental data

Lee, Boreum; Cho, Hyun‐Seok; Kim, Heehyang; Lim, Dongjun; Cho, Wonchul; Kim, Chang-Hee; Lim, Hankwon

doi:10.1016/j.jece.2021.106349

Cited by 58 publications

(14 citation statements)

References 29 publications

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“…Manufacturing costs related to the cathodes ( i.e ., deposition of the catalytic coating by airbrushing) were not considered. Then, the CAPEX of an ideal 1 MW-scale AEL plant based on the DEP configurations tested at lab-scale was calculated starting from data provided by IRENA 5 and reports on currently operating large-scale AEL plants ( Lee et al, 2021 ) ( Supplementary Table S2 ). In brief, the overall cost breakdown of a typical 1 + MW scale AEL has been used to retrieve the system CAPEX, including expenditures related to the Balance of Plant (BoP).…”

Section: Methodsmentioning

confidence: 99%

High-current density alkaline electrolyzers: The role of Nafion binder content in the catalyst coatings and techno-economic analysis

et al. 2022

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We report high-current density operating alkaline (water) electrolyzers (AELs) based on platinum on Vulcan (Pt/C) cathodes and stainless-steel anodes. By optimizing the binder (Nafion ionomer) and Pt mass loading (mPt) content in the catalysts coating at the cathode side, the AEL can operate at the following (current density, voltage, energy efficiency -based on the hydrogen higher heating value-) conditions (1.0 A cm−2, 1.68 V, 87.8%) (2.0 A cm−2, 1.85 V, 79.9%) (7.0 A cm−2, 2.38 V, 62.3%). The optimal amount of binder content (25 wt%) also ensures stable AEL performances, as proved through dedicated intermittent (ON-OFF) accelerated stress tests and continuous operation at 1 A cm−2, for which a nearly zero average voltage increase rate was measured over 335 h. The designed AELs can therefore reach proton-exchange membrane electrolyzer-like performance, without relying on the use of scarce anode catalysts, namely, iridium. Contrary to common opinions, our preliminary techno-economic analysis shows that the Pt/C cathode-enabled high-current density operation of single cell AELs can also reduce substantially the impact of capital expenditures (CAPEX) on the overall cost of the green hydrogen, leading CAPEX to operating expenses (OPEX) cost ratio <10% for single cell current densities ≥0.8 A cm−2. Thus, we estimate a hydrogen production cost as low as $2.06 kgH2−1 for a 30 years-lifetime 1 MW-scale AEL plant using Pt/C cathodes with mPt of 150 μg cm−2 and operating at single cell current densities of 0.6–0.8 A cm−2. Thus, Pt/C cathodes enable the realization of AELs that can efficiently operate at high current densities, leading to low OPEX while even benefiting the CAPEX due to their superior plant compactness compared to traditional AELs.

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Section: Methodsmentioning

confidence: 99%

High-current density alkaline electrolyzers: The role of Nafion binder content in the catalyst coatings and techno-economic analysis

et al. 2022

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“…In this study, it is assumed that the transported hydrogen is produced through alkaline water electrolysis (AW) with photovoltaics (PV), which is a renewable energy source, and the EIs of hydrogen and oxygen produced from AW are allocated based on their economic values. 41,42 The electricity produced from the hydrogenation part and CO 2 captured in both parts are considered avoided products whose EI values are negative.…”

Section: ■ Introductionmentioning

confidence: 99%

A System-Level Analysis for Long-Distance Hydrogen Transport Using Liquid Organic Hydrogen Carriers (LOHCs): A Case Study in Australia–Korea

Ahn,

Sohn,

Liu

et al. 2024

ACS Sustainable Chem. Eng.

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The toluene (TOL)–methylcyclohexane (MCH) system is one of the viable solutions because of its high stability and high hydrogen storage capacity (6.2%). However, the high volatilities of TOL and MCH and the accumulative byproducts make it difficult to transport hydrogen. Considering these limitations, we developed a new strategy introducing an extraction column and pressure swing adsorption with heat integration to reduce the required energy utilities. Furthermore, a comprehensive system-level analysis was conducted through an application example of the transport of hydrogen from Australia to Korea. The minimum transport cost of hydrogen was determined to be $2.17/kg-H2 via techno-economic analysis. Sensitivity and uncertainty analyses revealed the influence of the economic and process parameters. Finally, a life cycle assessment was conducted to compare the environmental impact (EI) of each part. Although dehydrogenation is more energy-demanding than hydrogenation, hydrogenation has larger EIs for some factors including fossil resource scarcity (13% larger) and water consumption (746% larger), due to the toluene and hydrogen makeup. Furthermore, we compared changes in the EIs in the energy sources. This study can provide insights into the optimization and decision-making of hydrogen supply chains to revitalize the hydrogen economy.

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“…Typically, Zirfon® membranes, nickel-based separators/diaphragms and stainless steel coated with nickel electrodes are used in alkaline water electrolysis. 7,8 The functionality of the electrochemical reaction is provided by the hydroxyl ion (OH − ), which permeates through the porous structure of the diaphragm along with KOH/NaOH and water molecules. Alkaline water electrolysis is a suitable system design for industrial and large-scale applications, design.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in hydrogen production through proton exchange membrane water electrolysis – a review

Sampangi

Lim

2023

Sustainable Energy Fuels

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Integrative techno-economic and environmental assessment for green H2 production by alkaline water electrolysis based on experimental data

Cited by 58 publications

References 29 publications

High-current density alkaline electrolyzers: The role of Nafion binder content in the catalyst coatings and techno-economic analysis

High-current density alkaline electrolyzers: The role of Nafion binder content in the catalyst coatings and techno-economic analysis

A System-Level Analysis for Long-Distance Hydrogen Transport Using Liquid Organic Hydrogen Carriers (LOHCs): A Case Study in Australia–Korea

Recent advances in hydrogen production through proton exchange membrane water electrolysis – a review

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