Effect of electrode Pt-loading and cathode flow-field plate type on the degradation of PEMFC

Qu, Lili; Wang, Zhiqiang; Guo, Xiaoqian; Song, Wei; Xie, Feng; He, Liang; Shao, Zhigang; Yi, Baolian

doi:10.1016/j.jechem.2018.09.004

Cited by 30 publications

(8 citation statements)

References 38 publications

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“…Cho et al confirmed that even if the same AST (load cycling) was applied, the lower the Pt/C loading at the cathode, the faster the Pt dissolution and redeposition in the membrane. Qu et al also reported that high catalyst loadings mitigate electrode degradation in PEMFCs using only one type of catalyst (70 wt % Pt/C). However, too high catalyst loading (>0.4 mg Pt cm –2 ) will accelerate the rate of electrode degradation due to the increased carbon corrosion caused by the weaker mass transfer in the thick electrode.…”

Section: Durability Of Pt-based Catalysts In Half- and Full-cellmentioning

confidence: 99%

Differences in the Electrochemical Performance of Pt-Based Catalysts Used for Polymer Electrolyte Membrane Fuel Cells in Liquid Half- and Full-Cells

et al. 2021

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A substantial amount of research effort has been directed toward the development of Pt-based catalysts with higher performance and durability than conventional polycrystalline Pt nanoparticles to achieve high-power and innovative energy conversion systems. Currently, attention has been paid toward expanding the electrochemically active surface area (ECSA) of catalysts and increase their intrinsic activity in the oxygen reduction reaction (ORR). However, despite innumerable efforts having been carried out to explore this possibility, most of these achievements have focused on the rotating disk electrode (RDE) in half-cells, and relatively few results have been adaptable to membrane electrode assemblies (MEAs) in full-cells, which is the actual operating condition of fuel cells. Thus, it is uncertain whether these advanced catalysts can be used as a substitute in practical fuel cell applications, and an improvement in the catalytic performance in real-life fuel cells is still necessary. Therefore, from a more practical and industrial point of view, the goal of this review is to compare the ORR catalyst performance and durability in half- and full-cells, providing a differentiated approach to the durability concerns in half- and full-cells, and share new perspectives for strategic designs used to induce additional performance in full-cell devices.

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Section: Durability Of Pt-based Catalysts In Half- and Full-cellmentioning

confidence: 99%

Differences in the Electrochemical Performance of Pt-Based Catalysts Used for Polymer Electrolyte Membrane Fuel Cells in Liquid Half- and Full-Cells

et al. 2021

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“…Although the efficiency of CuFeNLDH/CNTs-equipped electro-Fenton process for the degradation of target compound can be enhanced by increasing the amount of coated catalyst; however, increasing the amount of CuFeNLDH/CNTs may cause mass transfer limitation on the cathode surface [45], leading to the reduced formation of oxidizing agents in the electrochemical cell. Moreover, the aggregation of coated catalyst on the surface of the cathode is inevitable at higher amounts which may be the dominating factors leading to the loss of catalyst [46]. Overall, the agglomeration of catalyst or increasing the thickness of the coated catalyst leads to the reduced reactive sites for the reduction of diffused oxygen molecules.…”

Section: Comparison Of the Performance Of Different Electrodesmentioning

confidence: 99%

In-situ electro-generation and activation of hydrogen peroxide using a CuFeNLDH-CNTs modified graphite cathode for degradation of cefazolin

Ghasemi

Khataee

Gholami

et al. 2020

Journal of Environmental Management

186

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“…[5,6] PEFC catalyst durability has been previously studied extensively. [7][8][9][10][11] Platinum electrocatalysts are more prone to degradation on the cathode side of the PEFCs, rather than the anode due to higher potentials and more oxidizing conditions. [12,13] Previously, Wang et al [14] reported electrochemically active surface area (ECSA) loss of 54.5% and 30.2% for cathode and anode, respectively.…”

Section: Introductionmentioning

confidence: 99%

Probing Heterogeneous Degradation of Catalyst in PEM Fuel Cells under Realistic Automotive Conditions with Multi‐Modal Techniques

Khedekar

Talarposhti

Besli

et al. 2021

Advanced Energy Materials

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However, the durability and cost of such systems still remain a challenge. [2,3] Using the Department of Energy (DOE) cost-breakdown for the 80-kW net stack for light-duty vehicles, the cost of precious metal electrocatalyst remains almost unchanged as production rate increases to 0.5 M PEFC stacks per year. [4] The cost of the electrocatalyst amounts to 31% of stack cost, for 0.5 M systems per year production rate. [4] Platinum (Pt) or Pt-alloys are used as electrocatalyst for the oxygen reduction reaction (ORR) on the cathode side and the hydrogen oxidation reaction on the anode side of PEFCs. Pt or Pt-alloy electrocatalysts are dispersed as nanoparticles onto carbonblack support. DOE has set a target of reducing Pt loading to 0.125 mg cm −2 to achieve the goal of $12.6 kW net −1 for a stack with power density target of 1.8 W cm −2 . Membrane electrode assemblies (MEAs) with lower catalyst loading are less durable, [1] thus, the cost issue cannot be resolved without focusing on the catalyst durability issue of the PEFC stack. Moreover, heavy-duty trucks (HDTs) require stacks with 25 000-30 000 h lifetime, which to date requires ≥0.4 mg cm −2 [70] Pt catalyst loading. Significant progress in The heterogeneity of polymer electrolyte fuel cell catalyst degradation is studied under varied relative humidity and types of feed gas. Accelerated stress tests (ASTs) are performed on four membrane electrode assemblies (MEAs) under wet and dry conditions in an air or nitrogen environment for 30 000 square voltage cycles. The largest electrochemically active area loss is observed for MEA under wet conditions in a nitrogen gas environment AST due to constant upper potential limit of 0.95 V and significant water content. The mean Pt particle size is larger for the ASTs under wet conditions compared to dry conditions, and the Pt particle size under land is generally larger than under the channel. Observations from ASTs in both conditions and gas environments indicate that water content promotes Pt particle size growth. ASTs under wet conditions and an air environment show the largest difference in Pt particle size growth for inlet versus outlet and channel versus land, which can be attributed to larger water content at outlet and under land compared to inlet and under channel. From X-ray fluorescence experiments Pt particle size increase is a local phenomenon as Pt loading remains relatively uniform across the MEA.

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Effect of electrode Pt-loading and cathode flow-field plate type on the degradation of PEMFC

Cited by 30 publications

References 38 publications

Differences in the Electrochemical Performance of Pt-Based Catalysts Used for Polymer Electrolyte Membrane Fuel Cells in Liquid Half- and Full-Cells

Differences in the Electrochemical Performance of Pt-Based Catalysts Used for Polymer Electrolyte Membrane Fuel Cells in Liquid Half- and Full-Cells

In-situ electro-generation and activation of hydrogen peroxide using a CuFeNLDH-CNTs modified graphite cathode for degradation of cefazolin

Probing Heterogeneous Degradation of Catalyst in PEM Fuel Cells under Realistic Automotive Conditions with Multi‐Modal Techniques

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