Ultrathin nanoporous metal electrodes facilitate high proton conduction for low-Pt PEMFCs

Shi, Shuai; Wen, Xianglong; Sang, Qinqin; Yin, Shuai; Wang, Kaili; Zhang, Jian; Hu, Min; Yin, Huiming; He, Jia; Ding, Yi

doi:10.1007/s12274-020-3272-0

Cited by 16 publications

(5 citation statements)

References 49 publications

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“…Observing the I−V plots, the voltage drops of DFAFC with the Pd/C anode are obviously larger than that with the NPG-PdCuAu anode especially in the ohmic polarization region due to its higher internal ohmic resistance as reported previously. 51,52 In addition, the DFAFC performance using the NPG-PdCu anode seriously degrades during the operation conditions most likely due to Cu leaching depicted in Figure 3b. As indicated in Figure 5b, the maximum power densities of DFAFCs separately using Pd/C, NPG-Pd, NPG-PdCu, and NPG-PdCuAu anodes are 60.3, 70.9, 47.5, and 93.2 mW cm −2 , respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Au-Stabilized Nanoporous PdCuAu Alloys Exhibiting Outstanding Catalytic Activity and Durability for the Formic Acid Oxidation Reaction

Xie

Huang

Yin

et al. 2022

ACS Appl. Mater. Interfaces

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Metallic Pd is widely recognized as an efficient electrocatalyst for the formic acid oxidation reaction (FAOR), which unfortunately suffers from poor durability owing to Pd dissolution and CO poisoning. The present work describes an effective method to enhance Pd durability by alloying with Cu and Au. Cu could provide surface OH at low potentials to remove poisonous CO for improved CO resistance. Au, the most inert metal, was added to reduce Pd and Cu dissolution. Moreover, alloying with Cu and Au could also modulate the electronic structure of Pd which is just profitable for the FAOR. The constructed PdCuAu with a nanoporous structure exhibits a specific activity of 14.9 mA cm–2 and a Pd mass activity of 6012 A g–1, which is ∼15 times and ∼14 times higher than those of commercial Pd/C. While these two electrocatalysts were used as fuel cell anodes, the maximum power density of the PdCuAu anode (Pd loading 10 μg cm–2) is 93.2 mW cm–2 and the value of the Pd/C anode (Pd loading 1.2 mg cm–2) is 60.3 mW cm–2. The power efficiency of Pd has been notably increased by 185 times in this home-made nanoporous PdCuAu ternary alloy electrocatalyst.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Au-Stabilized Nanoporous PdCuAu Alloys Exhibiting Outstanding Catalytic Activity and Durability for the Formic Acid Oxidation Reaction

Xie

Huang

Yin

et al. 2022

ACS Appl. Mater. Interfaces

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“…49 (iii) Nanoporous thin film closely attached to the electrolyte membrane could reduce about a half of the contact area between methanol and the electrolyte membrane, i.e., suppress methanol crossover. 50 (iv) The NPG-Pt 2 Ru 1 anode without resin addition can expose all catalytic active sites and thus improve the utilization of Pt. (v) The enhanced nanoparticle-substrate interaction owing to the epitaxial growth mode could notably improve the structural stability of NPG-Pt 2 Ru 1 in contrast to the conventional carbon supported electrocatalysts interacting with van der Waals forces.…”

Section: Cell Performance Of the Ultra-thin Npg-pt 2 Ru 1 Anodementioning

confidence: 99%

Design of compressively strained PtRu alloy as anode for high-performance DMFCs

Yin,

Zong,

Ban

et al. 2024

Inorg. Chem. Front.

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“…Reports on the gas-phase catalysis of BNP Au have shown shallow depths reached by reactants, well below the full thickness of the monolith . The addition of a level of larger porosity as a shortcut for gas flow can significantly remedy the issue given the strong dependence of fluid permeability on the pore size, although measurements of the permeability in BNP metals have been rare , and their importance will only increase as more work on gas or liquid phase catalysis exploits BNP metals. Similar benefits have been claimed for the diffusive transport of ions in electrochemical devices, ,, although the underlying reason is not as clear.…”

Section: Self-organization Toward New Functionalitiesmentioning

confidence: 99%

Bicontinuous Nanoporous Metals with Self-Organized Functionalities

Chen

2022

Chem. Mater.

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The functional applications of bicontinuous nanoporous metals have been rapidly growing along with the fabrication methods of the materials. Besides the most common routes of electrochemical dealloying, liquid-metal dealloying, vapor-phase dealloying, and reduction-induced decomposition, all via similar mechanisms of interface-controlled selforganization have created a broad range of nanoporous structures made of noble metals (e.g., Au and Pt), refractory metals (e.g., Ti and Ta), and reactive metals (e.g., Al and Zn). They in turn enable new applications in catalysis, sensing, actuation, and electrochemical energy storage. Underlying the burgeoning development is the close connection between the functionalities and the structural evolution mechanism. In this perspective, I will dissect the structural complexity of bicontinuous nanoporous metal into three key features: the bicontinuity, the small length scale, and the compositional heterogeneity. I will discuss their roots in the self-organization process and their ties to properties such as mechanical strength, conductivity, and catalytic activity. The analysis will be centered around two aspects of the dealloying theory, namely, percolation and surface diffusion, showing how they can be applied to quantitatively understand the self-organized functionalities. In the end, I will also highlight emerging opportunities for structural designs to further advance the functional applications of the materials.

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Ultrathin nanoporous metal electrodes facilitate high proton conduction for low-Pt PEMFCs

Cited by 16 publications

References 49 publications

Au-Stabilized Nanoporous PdCuAu Alloys Exhibiting Outstanding Catalytic Activity and Durability for the Formic Acid Oxidation Reaction

Au-Stabilized Nanoporous PdCuAu Alloys Exhibiting Outstanding Catalytic Activity and Durability for the Formic Acid Oxidation Reaction

Design of compressively strained PtRu alloy as anode for high-performance DMFCs

Bicontinuous Nanoporous Metals with Self-Organized Functionalities

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