Novel analytic method of membrane electrode assembly parameters for fuel cell consistency evaluation by micro-current excitation

Ren, Peng; Pei, Pucheng; Chen, Dongfang; Li, Yuehua; Wu, Ziyao; Zhang, Lu; Li, Zizhao; Wang, Mingkai; Wang, He; Wang, Bozheng; Wang, Xizhong

doi:10.1016/j.apenergy.2021.118068

Cited by 28 publications

(7 citation statements)

References 30 publications

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“…Membrane electrode assembly (MEA) is the core component for energy conversion of proton exchange membrane water electrolysis. − MEA is responsible for the transport of multiphase materials including liquid water, hydrogen, oxygen, proton, and electron. , With the development of flexible fuel cells, flexible, portable, high-current density, and ultrathin MEA has been invented. − Motivated by the advantages of low operating voltage and no hydrogen production in oxygen production from air in eq , it is supposed that a low-cost and portable device can be achieved by integrating air-separation technology and MEA.…”

Section: Resultsmentioning

confidence: 99%

“…Figure b shows that the ABEEPO with RuO 2 , PtRu black, and Pt/C as the anode materials exhibited poor durability, and the current densities were sharply decreased by 75, 60, and 86% in 2 h. Pt/C has the highest relative drop of current density. The instability for RuO 2 , PtRu black, and Pt/C may be ascribed to the oxidation of surface RuO 2 to water-soluble RuO 4 , − the dissolution of Ru in acidic medium, − and low electrochemical oxidation resistance of Pt in acidic medium, , respectively. In contrast, the ABEEPO with IrO 2 as the anode material exhibited high stability in 2 h, and the current density only decreased by 12%.…”

Section: Resultsmentioning

confidence: 99%

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Ultralight, Safe, Economical, and Portable Oxygen Generators with Low Energy Consumption Prepared by Air-Breathing Electrochemical Extraction

Gao

Ning

et al. 2022

ACS Appl. Mater. Interfaces

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Pure oxygen is vital in medical treatment, first aid, and chemical synthesis. Hypoxia can cause severe damage to the organ systems such as respiratory, digestive, and nervous systems and even directly cause death. Notably, the severe Coronavirus disease 2019 (COVID-19) pandemic has exacerbated the shortage of medical oxygen in the world. Hence, a safe, economical, and portable oxygen supply device is urgently needed. Here, we have successfully prepared a device with air-breathing electrochemical extraction of pure oxygen (ABEEPO) with light weight and high energy efficiency. By renovating the structure of the electrolytic cell, the components bipolar plate and end plate are replaced with a plastic membrane, and the component current collector is replaced with a highly conductive graphene composite membrane electrode. Due to the use of the plastic membrane and graphene composite membrane electrode, the weight of the electrolytic cell is reduced from 1319.4 to 1.6 g, and the flexibility of the electrolytic cell is successfully realized. Through optimizing anode catalysts, working area, and operating voltage, a high flow rate per mass (234 mL h −1 g −1 ) was achieved at a voltage of 1.2 V. The device exhibits high stability in 2 h. The new portable oxygen production device would be effective for hypoxia treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ultralight, Safe, Economical, and Portable Oxygen Generators with Low Energy Consumption Prepared by Air-Breathing Electrochemical Extraction

Gao

Ning

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…These two phenomena have great influence on the wide-operating-range AWEs especially driven by fluctuating renewable energy sources. However, because corresponding mechanisms are not analyzed effectively, some conventional methods, like novel catalysts [38][39][40][41] , highly consistent cells of AWEs [42][43] and so on, cannot well solve these two problems. The related theoretical analyses are verified by a 10 kW @ 80 ℃ commercial AWE (rated hydrogen production rate is about 2 Nm 3 /h), except the lab-scale test system.…”

Section: Current Bunching Effect Of Large-scale Alkaline Hydrogen Evo...mentioning

confidence: 99%

Current Bunching Effect of Large-Scale Alkaline Hydrogen Evolution

Wei,

Xia,

Cheng

et al. 2023

Preprint

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Alkaline water electrolysers (AWEs) are suitable for the industrial hydrogen production driven by renewable energy sources. However, the understanding about the operating principle of large-scale AWEs is not profound and enough. Here, we report the current bunching effect and its related phenomena for large-scale AWEs, namely low-load inefficiency and anomalous efficiency-temperature relationship. It is generally thought that the electrolysis or ionic current is distributed uniformly on the surface of bipolar plates in AWEs, but in fact, the current is not consistent and locates within narrow areas especially for low-load states. Through the detailed electric field calculation, the mechanism of current bunching effect is revealed. It is pointed out that the physical structures and electrical characteristics instead of the chemical properties of AWEs are strongly related to the current bunching effect. Based on the found current bunching effect, the inefficiency and anomalous efficiency-temperature relationship of low-load AWEs can be explained effectively. This work sheds new light on and provides inspiration for the further development of the industrial hydrogen production from fluctuating renewable energy sources based on low-cost AWEs.

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“…The ine ciency probelm will cause extra energy dissipation, and the inconsistency problem will cause obvious lifetime degradation of long-running cells. Because corresponding mechanisms are not analyzed effectively, some conventional methods, like novel catalysts [36][37][38][39] , highly consistent cells of AWEs [40][41] and so on, cannot well solve these two problems. Here, we analyze the detailed operation process of AWEs and establish the equivalent electrical model.…”

Section: ℃ ℃mentioning

confidence: 99%

Operation Range Enhancement for Alkaline Electrolysers Driven by Renewable Energy Sources

Xia

Wei

2022

Preprint

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Low-cost and mature alkaline water electrolysis is suitable for large-scale hydrogen production from renewable energy sources (RESs). However, the poor low-load performance of alkaline water electrolysers (AWEs) makes it difficult to follow fluctuant RESs in full range. For low-load AWEs, existing researches only pay attention to the impurity problem and its solutions, but here, we find other two urgent problems to be solved, namely inefficiency and inconsistency. Through the detailed operation process analysis of AWEs and the established equivalent electrical model, the inefficiency and inconsistency mechanisms of low-load AWEs are revealed. Furthermore, an overcurrent pulse-width modulation method is proposed to enhance the efficiency and consistency of AWEs. Especially, compared to the conventional dc power supply, 1) the maximum efficiency improvement can exceed two times, 2) the operation range can be extended to 10% of rated load. The proposed method just changes the power supply, it can be easily generalized and can facilitate the hydrogen production from RESs.

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Novel analytic method of membrane electrode assembly parameters for fuel cell consistency evaluation by micro-current excitation

Cited by 28 publications

References 30 publications

Ultralight, Safe, Economical, and Portable Oxygen Generators with Low Energy Consumption Prepared by Air-Breathing Electrochemical Extraction

Ultralight, Safe, Economical, and Portable Oxygen Generators with Low Energy Consumption Prepared by Air-Breathing Electrochemical Extraction

Current Bunching Effect of Large-Scale Alkaline Hydrogen Evolution

Operation Range Enhancement for Alkaline Electrolysers Driven by Renewable Energy Sources

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