Key criteria for next-generation dimensionally stable electrodes towards large-scale green hydrogen production by water electrolysis

Hoisang, Watcharaporn; Sakaushi, Ken

doi:10.1016/j.coelec.2022.101136

Cited by 13 publications

(5 citation statements)

References 107 publications

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“…Specifically adsorbed anions can alter the electrocatalytic kinetics and mechanism. Ir metal and oxides exhibit high performance for the HER/HOR and OER. ,, As shown in Supplementary Figure S5, phosphate species are adsorbed at high potentials where the OER occurs. Therefore, in this study, we evaluated the OER kinetics on Ir(111) at different pH conditions and discussed the effect of adsorbed phosphate species.…”

Section: Resultsmentioning

confidence: 99%

“…The pH condition strongly governs the kinetics and mechanism of electrocatalytic reactions involving electron and proton transfer processes. − Furthermore, the anion adsorption and its effect on electrocatalysis are also affected by the pH condition. Recent works showed that the adsorption energy and poisoning effect of bromide on Pt(111) for the ORR decreases as the pH increases. , Phosphate buffer electrolytes are useful for electrochemical studies on a wide range of pH.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, we focused on the Ir electrode, which has not been widely studied in phosphate electrolytes so far. Ir metal and Ir oxides (IrO x ) are promising for high-performance HER/HOR and OER electrocatalysts, respectively. ,, The OER performance of Ir electrodes is strongly affected by electrolyte anions; however, the adsorption characteristics of phosphate anions on the Ir surface are still open. Here, we discuss the phosphate adsorption on the Ir electrode over a wide range of pH.…”

Section: Introductionmentioning

confidence: 99%

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Joint Kinetic/In Situ Spectrometric Investigation of the Multielectron/Multiproton-Transfer-Based Adsorption Electrode Process of Phosphate Anions on the Ir(111) Surface across a Comprehensive pH Range

Kumeda

Sakaushi

2023

J. Phys. Chem. C

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Understanding the intriguing nature of multielectron/-proton transfer electrode processes is essential for designing advanced electrode materials. Phosphate buffer is a typical electrolyte system for studying electrocatalysis, such as water electrolysis and fuel cell reactions over a wide pH range. The phosphate anions are known to exhibit a remarkable site-blocking effect toward various electrode processes, which is comparable to or greater than sulfate anions. However, less is known about the effect of phosphate adsorption on electrode processes because only a few comprehensive analyses on the phosphate adsorption effects for electrocatalysis have been carried out over a wide range of pH. Here, we show a combination of kinetic analysis and in situ FTIR spectrometry for uncovering the electrode process based on the phosphate adsorption dynamics on Ir(111) under acidic, neutral, and alkaline conditions, from pH 1.7 to 12.1. The spectroscopic study aims to unveil the correlation between phosphate adsorption in different pH and electrocatalytic performance for the oxygen evolution reaction. In situ spectrometry revealed the pH-and potential-dependent polyprotic nature and binding strength of adsorbed phosphate anions. We observed that the phosphate adsorption occurs at a more negative potential under low pH (acidic) conditions compared to higher pH (neutral and alkaline) conditions. The onset potential of the phosphate adsorption becomes lower in the order of Ir < Pt < Au, indicating strong binding of the phosphate adlayer on Ir. The phosphate adsorption on Ir(111) leads to remarkable site-blocking effects on surface oxide formation. Furthermore, phosphate anions are adsorbed on Ir(111) at the OER potential region (>1.23 V vs RHE), and the inhibiting and buffering effects of phosphate anions influence OER performance on the Ir surface.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Joint Kinetic/In Situ Spectrometric Investigation of the Multielectron/Multiproton-Transfer-Based Adsorption Electrode Process of Phosphate Anions on the Ir(111) Surface across a Comprehensive pH Range

Kumeda

Sakaushi

2023

J. Phys. Chem. C

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“…The development of new electrocatalysts with excellent performances for the OER was proceeded by a powerful design and high-throughput calculation of AI. As shown below the OER under alkaline conditions can be described by the four reaction steps. , To improve the properties of this complicated 4-electron-transferring electrode process, a specific combination of elements is indispensable to design a high OER activity as well as durability.…”

Section: Resultsmentioning

confidence: 99%

Human–Machine Collaboration for Accelerated Discovery of Promising Oxygen Evolution Electrocatalysts with On-Demand Elements

Sakaushi,

Hoisang,

Tamura

2023

ACS Cent. Sci.

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“…A review article on massive green hydrogen production presented by Hoisang and Sakaushi [9] discusses important factors for developing electrodes that can be used in the production of green hydrogen through water electrolysis. The authors highlight the need for dimensionally stable electrodes that can operate efficiently and durably at large scales.…”

Section: Introductionmentioning

confidence: 99%

Massive Green Hydrogen Production Using Solar and Wind Energy: Comparison between Europe and the Middle East

Jaszczur

Hassan

Sameen³

et al. 2023

Energies

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This comparative study examines the potential for green hydrogen production in Europe and the Middle East, leveraging 3MWp solar and wind power plants. Experimental weather data from 2022 inform the selection of two representative cities, namely Krakow, Poland (Europe), and Diyala, Iraq (Middle East). These cities are chosen as industrial–residential zones, representing the respective regions’ characteristics. The research optimizes an alkaline water electrolyzer capacity in juxtaposition with the aforementioned power plants to maximize the green hydrogen output. Economic and environmental factors integral to green hydrogen production are assessed to identify the region offering the most advantageous conditions. The analysis reveals that the Middle East holds superior potential for green hydrogen production compared to Europe, attributed to a higher prevalence of solar and wind resources, coupled with reduced land and labor costs. Hydrogen production costs in Europe are found to range between USD 9.88 and USD 14.31 per kilogram, in contrast to the Middle East, where costs span from USD 6.54 to USD 12.66 per kilogram. Consequently, the Middle East emerges as a more feasible region for green hydrogen production, with the potential to curtail emissions, enhance air quality, and bolster energy security. The research findings highlight the advantages of the Middle East industrial–residential zone ‘Diyala’ and Europe industrial–residential zone ‘Krakow’ in terms of their potential for green hydrogen production.

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Key criteria for next-generation dimensionally stable electrodes towards large-scale green hydrogen production by water electrolysis

Cited by 13 publications

References 107 publications

Joint Kinetic/In Situ Spectrometric Investigation of the Multielectron/Multiproton-Transfer-Based Adsorption Electrode Process of Phosphate Anions on the Ir(111) Surface across a Comprehensive pH Range

Joint Kinetic/In Situ Spectrometric Investigation of the Multielectron/Multiproton-Transfer-Based Adsorption Electrode Process of Phosphate Anions on the Ir(111) Surface across a Comprehensive pH Range

Human–Machine Collaboration for Accelerated Discovery of Promising Oxygen Evolution Electrocatalysts with On-Demand Elements

Massive Green Hydrogen Production Using Solar and Wind Energy: Comparison between Europe and the Middle East

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