Membrane electrode assembly fabricated with the combination of Pt/C and hollow shell structured-Pt-SiO 2 @ZrO 2 sphere for self-humidifying proton exchange membrane fuel cell

Ko, Youngdon; Yang, Haoran; Züttel, Andreas; Kim, S.D.; Kim, W.J.

doi:10.1016/j.jpowsour.2017.09.043

Cited by 12 publications

(8 citation statements)

References 29 publications

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“…However, with decreasing RH, the dependency of the cell performance on the pH used for the preparation of HTiO 2 becomes more significant; it is 0.67 W/cm 2 at an RH 0% and pH 5.0, 0.59 W/cm 2 at a pH 7.0, and 0.8 W/cm 2 at a pH 9.0. On the basis of the comparison of these results with our previous results, , where the highest power densities of Pt–C/Pt-TiO 2 and Pt–C/Pt-HZrO 2 DCE were 0.68 W/cm 2 and 0.51 W/cm 2 , respectively, the power density of the Pt–C/Pt-HTiO 2 DCE is enhanced by 17.6% and 56.9%, respectively. This suggests that the Pt-HTiO 2 is a feasible DCE for self-humidifying PEMFCs and that the pH is very important for the particle sizes of Pt and TiO 2 , affecting the cell performance, especially at an RH 0%.…”

Section: Resultssupporting

confidence: 70%

“…They also reported that the Pt-TiO 2 layer on the anode side produces water molecules consuming H 2 and O 2 crossing the membrane. More recently, Ko et al 17 effects of a presence or absence of the DCE at the cathode on the water flooding and rapid voltage were comprehensively investigated through visual cell tests. However, the cell performance was not sufficient.…”

Section: ■ Introductionmentioning

confidence: 99%

“…They also reported that the Pt-TiO 2 layer on the anode side produces water molecules consuming H 2 and O 2 crossing the membrane. More recently, Ko et al reported a DCE comprising Pt/C and Pt-hollow-structured ZrO 2 (Pt-HZrO 2 ) as the dual layer for self-humidifying PEMFCs. In this study, the hollow-structured ZrO 2 (HZrO 2 ) provides a high specific surface area, and the effects of a presence or absence of the DCE at the cathode on the water flooding and rapid voltage were comprehensively investigated through visual cell tests.…”

Section: Introductionmentioning

confidence: 99%

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Physical and Electrochemical Properties of Pt-Hollow-Structured TiO₂ Prepared at Different pH’s and Its Self-Humidifying Ability in PEMFC

Kim

2018

ACS Sustainable Chem. Eng.

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In this study, SiO 2 @TiO 2 core−shell nanoparticles were prepared under different pH's such as 5.0, 7.0, and 9.0. Under acidic and neutral conditions, silica nanoparticles are more agglomerated, while less agglomeration occurs under alkaline conditions. The latter case is attributed to repulsive forces between negatively charged silica nanoparticles because of the lack of protons under alkaline conditions. It was also observed that the individual particle size of hollow-structured TiO 2 (HTiO 2 ) is significantly affected by the pH. Below a pH of 7.0, the particle size of TiO 2 is larger than that at pH 9.0 because of the hydrolysis and condensation of titanium tetrabutoxide via the sol−gel process. The smaller the particle sizes of SiO 2 and HTiO 2 are, the larger is the Brunauer−Emmett−Teller (BET) surface area, and the higher are the water uptake and electrochemical active surface area (ECSA). The ECSAs of Pt-HTiO 2 for the water formation were determined to be 19.1, 13.8, and 25.0 m 2 /g, with the increase in pH. The cell performance is similar under high relative humidity. However, under zero humidity, a significant enhancement is observed at pH 9.0 (0.8 W/cm 2 ) compared with 0.67 W/cm 2 for pH 5.0 and 0.59 W/cm 2 for pH 7.0, indicating an excellent self-humidifying ability.

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Section: Resultssupporting

confidence: 70%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physical and Electrochemical Properties of Pt-Hollow-Structured TiO₂ Prepared at Different pH’s and Its Self-Humidifying Ability in PEMFC

Kim

2018

ACS Sustainable Chem. Eng.

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“…Among these materials, metal oxides have been considered the most suitable candidate for widespread application on the support of high‐loading catalysts in LTFCs owing to their low cost and excellent electrochemical stability in harsh acidic environment. For example, Ko and coworkers 109 prepared a high surface area HZrO 2 with novel hollow sphere structure as support material for high‐loading Pt NPCs. Due to its hydrophilic surface property, the metal loading was able to rise up to 43 wt.%, while Pt NPs were still dispersed uniformly on the support.…”

Section: High‐loading Pt Npcsmentioning

confidence: 99%

Recent advances in high‐loading catalysts for low‐temperature fuel cells: From nanoparticle to single atom

Shen

et al. 2021

SusMat

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Low‐temperature fuel cells (LTFCs) are considered to be one of the most promising power sources for widespread application in sustainable and renewable energy conversion technologies. Although remarkable advances have been made in the mass activity of catalysts, mass transport impedance needs to be urgently addressed at a well‐designed membrane electrode assembly (MEA) scale. Increasing the loading of electrocatalysts is conducive to prepare thinner and more efficient MEAs owing to the resulting enhanced reactant permeability, better proton diffusion, and lower electrical resistance. Herein, recent progress in high‐loading (≥40 wt.%) Pt nanoparticle catalysts (NPCs) and high‐loading (≥2 wt.%) single‐atom catalysts (SACs) for LTFC applications are reviewed. A summary of various synthetic approaches and support materials for high‐loading Pt NPCs and SACs is systematically presented. The influences of high surface area and appropriate surface functionalization for Pt NPCs, as well as coordination environment, spatial confinement effect, and strong metal‐support interactions (SMSI) for SACs are highlighted. Additionally, this review presents some ideas regarding challenges and future opportunities of high‐loading catalysts in the application of LTFCs.

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“…Based on the similar principle, some other additives have also been used to support the Pt particle and achieve self-humidification [48,49,[54][55][56][57][58][59][60][61][62]. The advantages and the related references are listed in Table 2.…”

Section: Changing the Composition Of Electrodementioning

confidence: 99%

Humidification strategy for polymer electrolyte membrane fuel cells – A review

et al. 2018

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Polymer electrolyte membrane fuel cells are promising power sources because of their advantage such as high efficiency, zero emission and low operating temperature. Water management is one of the critical issues for polymer electrolyte membrane fuel cells and has received significant attention. The membrane within the cells needs to stay in hydrated state to have high ion conductivity and durability, which requires proper humidification. Both internal and external methods have been utilized to humidify the polymer electrolyte membrane. Numerous studies on fuel cell humidification have been conducted in the past decades, especially in recent years. This review aims to summarize the main humidification methods and the related studies. The internal humidification methods are classified as physical methods and chemical methods. The external humidification methods include gas bubbling humidification, direct water injection, enthalpy wheel humidification, membrane humidifiers, and exhaust gas recirculation. The working principle and performance of

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Membrane electrode assembly fabricated with the combination of Pt/C and hollow shell structured-Pt-SiO 2 @ZrO 2 sphere for self-humidifying proton exchange membrane fuel cell

Cited by 12 publications

References 29 publications

Physical and Electrochemical Properties of Pt-Hollow-Structured TiO₂ Prepared at Different pH’s and Its Self-Humidifying Ability in PEMFC

Physical and Electrochemical Properties of Pt-Hollow-Structured TiO₂ Prepared at Different pH’s and Its Self-Humidifying Ability in PEMFC

Recent advances in high‐loading catalysts for low‐temperature fuel cells: From nanoparticle to single atom

Humidification strategy for polymer electrolyte membrane fuel cells – A review

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Membrane electrode assembly fabricated with the combination of Pt/C and hollow shell structured-Pt-SiO 2 @ZrO 2 sphere for self-humidifying proton exchange membrane fuel cell

Cited by 12 publications

References 29 publications

Physical and Electrochemical Properties of Pt-Hollow-Structured TiO2 Prepared at Different pH’s and Its Self-Humidifying Ability in PEMFC

Physical and Electrochemical Properties of Pt-Hollow-Structured TiO2 Prepared at Different pH’s and Its Self-Humidifying Ability in PEMFC

Recent advances in high‐loading catalysts for low‐temperature fuel cells: From nanoparticle to single atom

Humidification strategy for polymer electrolyte membrane fuel cells – A review

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Product

Resources

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Physical and Electrochemical Properties of Pt-Hollow-Structured TiO₂ Prepared at Different pH’s and Its Self-Humidifying Ability in PEMFC

Physical and Electrochemical Properties of Pt-Hollow-Structured TiO₂ Prepared at Different pH’s and Its Self-Humidifying Ability in PEMFC