Free-standing and ionomer-free 3D platinum nanotrough fiber network electrode for proton exchange membrane fuel cells

Qi, Manman; Zeng, Yachao; Hou, Ming; Gou, Yong; Song, Wei; Chen, Haiping; Wu, Gang; Jia, Zhenghao; Gao, Yanyan; Zhang, Hongjie; Shao, Zhigang

doi:10.1016/j.apcatb.2021.120504

Cited by 27 publications

(18 citation statements)

References 49 publications

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“…In contrast, anode CLs fabricated through conventional routes suffered from low performance and stability for the following four reasons: 1) anion-exchange ionomers randomly wrap IrO 2 nanoparticles, forming discrete and tortuous OHtransfer pathways, resulting in low utilization of catalysts in anode CL. [12] 2) Ionomer-coated electrocatalysts have a low adhesiveThe design of high-performance and durable electrodes for the oxygen evolution reaction (OER) is crucial for pure-water-fed anion exchange membrane water electrolysis (AEMWE). In this study, an integrated electrode with vertically aligned ionomer-incorporated nickel-iron layered double hydroxide nanosheet arrays, used on one side of the liquid/gas diffusion layer, is fabricated for the OER.…”

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Construction of Integrated Electrodes with Transport Highways for Pure‐Water‐Fed Anion Exchange Membrane Water Electrolysis

Wan

Liu

et al. 2022

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The design of high‐performance and durable electrodes for the oxygen evolution reaction (OER) is crucial for pure‐water‐fed anion exchange membrane water electrolysis (AEMWE). In this study, an integrated electrode with vertically aligned ionomer‐incorporated nickel‐iron layered double hydroxide nanosheet arrays, used on one side of the liquid/gas diffusion layer, is fabricated for the OER. Transport highways in the fabricated integrated electrode, significantly improve the transport of liquid/gas, hydroxide ions, and electron in the anode, resulting in a high current density of 1900 mA cm–2 at 1.90 V in pure‐water‐fed AEMWE. Specifically, three‐electrode and single‐cell measurement results indicate that an anion‐exchange ionomer can increase the local OH– concentration on the integrated electrodes surface and facilitate the OER for pure‐water‐fed AEMWE. This study highlights a new approach to fabricating and understanding electrode architecture with enhanced performance and durability for pure‐water‐fed AEMWE.

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Construction of Integrated Electrodes with Transport Highways for Pure‐Water‐Fed Anion Exchange Membrane Water Electrolysis

Wan

Liu

et al. 2022

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“…Besides thermal management, good water management is also required for PEMFCs to transport the reaction product water. [51] Therefore, the hydrophobicity of BP materials plays important roles in preventing the accumulation of water and distributing gaseous along flooding channels. The wettability of bare Ti alloy and VG-Ti alloy was assessed by using contact angle (CA) measurements.…”

Section: Resultsmentioning

confidence: 99%

Vertical‐Graphene‐Reinforced Titanium Alloy Bipolar Plates in Fuel Cells

Wang

Cui

et al. 2022

Advanced Materials

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membrane electrode assembly, collecting current, transporting gas reactants, and enabling thermal and water management. [2] In terms of these functions, a good BP material is required to possess the characteristics of reliable mechanical strength, high electrical and thermal conductivities, low gas permeability, good hydrophobicity, etc. Traditional graphite BPs are hindered from the mass production and long-term use by their brittleness and large gas permeability. [3,4] In contrast, metallic BPs, such as stainless steel, aluminum, titanium (Ti), and their alloys, can satisfy the requirements nicely, making them the attractive BP material candidates for PEMFCs. [5] Among these metals, Ti and its alloys have received widespread attention in recent years owing to their high specific strength and anticorrosion performance. [6] However, there remain two major challenges for the practical application of Ti and its alloys: i) their surfaces are naturally covered with a nonconductive passivation layer, which hampers the power density of PEMFCs due to the interface contact resistance (ICR) between BP and gas diffusion layer (GDL); ii) although the passive oxide layer benefits the anticorrosion performance of Ti and its alloys, corrosion will inevitably occur in the acidic operating environment of PEMFCs, leading to the degradation of PEMFCs' performance. [6,7] The bipolar plate (BP) serves as one of the crucial components in proton exchange membrane fuel cells (PEMFCs). Among BP materials, metallic BPs are widely employed due to their outstanding comprehensive properties. However, the interfacial contact resistance (ICR) between BP and gas diffusion layer together with corrosion of metallic BP under acidic operating conditions degrades the performance and stability of PEMFCs. Herein, an approach is proposed for the surface reinforcement of titanium (Ti) alloy BPs, relying on a directly grown vertical graphene (VG) coating via the plasma-enhanced chemical vapor deposition method. Compared with bare Ti alloy, the corrosion rate of VG-coated Ti alloy reduces by 1-2 orders of magnitude in the simulated PEMFC operating environments and ICR decreases by ≈100 times, while its thermal conductivity improves by ≈20% and water contact angle increases by 68.1°. The results can be interpreted that the unique structure of VG enables excellent electrical and thermal conduction in PEMFCs, and the highly hydrophobic VG coating suppresses the penetration of corrosive liquid as well as contributing to water management. This study opens a new opportunity to reinforce metallic surfaces by the robust and versatile VG coating for highperformance electrodes used in energy and catalyst applications.

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“…With the reduced surface energy, a fibrous architecture proposes great hydrophobic performance to efficiently transport and repel water for multiple applications ( 28 , 29 ). In LT-PEFCs, electrodes with fibrous structures provide much optimized water management under real working circumstances for their rapid draining of the extra water generated from the cathode reaction ( 30 , 31 ). However, viewpoints of the fluidic PA well organized and rearranged within the porous electrode to accelerate the mass transport processes in HT-PEFCs have not been considered yet.…”

Section: Introductionmentioning

confidence: 99%

Uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells

et al. 2023

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Ultrahigh mass transport resistance and excessive coverage of the active sites introduced by phosphoric acid (PA) are among the major obstacles that limit the performance of high-temperature polymer fuel cells, especially compared to their low-temperature counterparts. Here, an alternative strategy of electrode design with fibrous networks is developed to optimize the redistribution of acid within the electrode. Via structural tailoring with varied electrospinning parameters, uneven migration of PA with dispersed droplets is observed, subverting the immersion model of conventional porous electrode. Combining with experimental and calculation results, the microscaled uneven PA interfaces could not only provide extra diffusion pathways for oxygen but also minimize the thickness of PA layers. This electrode architecture demonstrates enhanced electrochemical performance of oxygen reduction within the PA phase, resulting in a 28% enhancement of the maximum power density for the optimally designed electrode as cathode compared to that of a conventional one.

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Free-standing and ionomer-free 3D platinum nanotrough fiber network electrode for proton exchange membrane fuel cells

Cited by 27 publications

References 49 publications

Construction of Integrated Electrodes with Transport Highways for Pure‐Water‐Fed Anion Exchange Membrane Water Electrolysis

Construction of Integrated Electrodes with Transport Highways for Pure‐Water‐Fed Anion Exchange Membrane Water Electrolysis

Vertical‐Graphene‐Reinforced Titanium Alloy Bipolar Plates in Fuel Cells

Uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells

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