In-situ investigation on the CO tolerance of carbon supported Pd–Pt electrocatalysts with low Pt content by electrochemical impedance spectroscopy

Tang, Yongfu; Zhang, Huamin; Zhong, Hexiang; Xu, Zhuang

doi:10.1016/j.ijhydene.2011.10.104

Cited by 20 publications

(3 citation statements)

References 35 publications

(45 reference statements)

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“…The morphology and composition of the spent Rh 2 Sb NBs/C were largely maintained, whereas severe aggregations occurred for the spent Rh NBs/C and commercial Pt/C (Figure S15, Supporting Information). Considering the existence of trace amount of CO in the actual low‐temperature hydrogen‐oxygen fuel cell, [ 36 ] the resistance to CO poisoning of catalyst was therefore further investigated. [ 37 ] Compared to the obvious decays in the current densities for Rh NBs/C and Pt/C in the presence of 100 ppm CO, Rh 2 Sb NBs/C displayed a much smaller decay in current density from HOR polarization curves (Figure S16, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Atomically Isolated Rh Sites within Highly Branched Rh₂Sb Nanostructures Enhance Bifunctional Hydrogen Electrocatalysis

Zhang

Zhao

et al. 2021

Advanced Materials

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Breaking the bottleneck of hydrogen oxidation/evolution reactions (HOR/HER) in alkaline media is of tremendous importance for the development of anion exchange membrane fuel cells/water electrolyzers. Atomically dispersed active sites are known to exhibit excellent activity and selectivity toward diverse catalytic reactions. Here, a class of unique Rh2Sb nanocrystals with multiple nanobranches (denoted as Rh2Sb NBs) and atomically dispersed Rh sites are reported as promising electrocatalysts for alkaline HOR/HER. Rh2Sb NBs/C exhibits superior HER performance with a low overpotential and a small Tafel slope, outperforming both Rh NBs/C and commercial Pt/C. Significantly, Rh2Sb NBs show outstanding HOR performance of which the HOR specific activity and mass activity are about 9.9 and 10.1 times to those of Rh NBs/C, and about 4.2 and 3.7 times to those of Pt/C, respectively. Strikingly, Rh2Sb NBs can also exhibit excellent CO tolerance during HOR, whose activity can be largely maintained even at 100 ppm CO impurity. Density functional theory calculations reveal that the unsaturated Rh sites on Rh2Sb NBs surface are crucial for the enhanced alkaline HER and HOR activities. This work provides a unique catalyst design for efficient hydrogen electrocatalysis, which is critical for the development of alkaline fuel cells and beyond.

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Section: Resultsmentioning

confidence: 99%

Atomically Isolated Rh Sites within Highly Branched Rh₂Sb Nanostructures Enhance Bifunctional Hydrogen Electrocatalysis

Zhang

Zhao

et al. 2021

Advanced Materials

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“…However, the study of the poisoning effects of reformate mixtures is usually limited to CO 2 and CO, perhaps due the fact that they are common to most reforming processes, especially the reforming of alcohols and hydrocarbons. The effects of CO are usually associated to preferential surface adsorption of its molecules on the catalyst, thereby reducing the electro-active area [14]. The effects of CO 2 on the other hand are limited to dilution of the anode feed, with the possibility of chemical or electrochemical reduction into CO [15].…”

Section: Introductionmentioning

confidence: 99%

Performance and endurance of a high temperature PEM fuel cell operated on methanol reformate

Araya

Grigoras

Zhou

et al. 2014

International Journal of Hydrogen Energy

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This paper analyzes the effects of methanol and water vapor on the performance of a high temperature proton exchange membrane fuel cell (HT-PEMFC) at varying temperatures, ranging from 140 C to 180 C. For the study, a H 3 PO 4 e doped polybenzimidazole (PBI) e based membrane electrode assembly (MEA) of 45 cm 2 active surface area from BASF was employed. The study showed overall negligible effects of methanol-water vapor mixture slips on performance, even at relatively low simulated steam methanol reforming conversion of 90%, which corresponds to 3% methanol vapor by volume in the anode gas feed. Temperature on the other hand has significant impact on the performance of an HT-PEMFC. To assess the effects of methanol-water vapor mixture alone, CO 2 and CO are not considered in these tests. The analysis is based on polarization curves and impedance spectra registered for all the test points. After the performance tests, endurance test was performed for 100 h at 90% methanol conversion and an overall degradation rate of À55 mV/ h was recorded.

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“…It has been reported that a CO concentration of 10 ppm and above will poison Pt [ 1 , 2 ]. A significant amount of research has been carried out to improve the CO tolerance by using advanced Pt alloy catalysts [ 3 , 4 , 5 , 6 ], or alternative membranes capable of operating at higher temperatures [ 7 , 8 , 9 , 10 , 11 ]. H 2 purifying devices can also be used to remove CO, but the use of such additional steps has a negative effect on the overall process in terms of cost and efficiency [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Al2O3 Disk Supported Si3N4 Hydrogen Purification Membrane for Low Temperature Polymer Electrolyte Membrane Fuel Cells

et al. 2013

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Reformate gas, a commonly employed fuel for polymer electrolyte membrane fuel cells (PEMFCs), contains carbon monoxide, which poisons Pt-containing anodes in such devices. A novel, low-cost mesoporous Si3N4 selective gas separation material was tested as a hydrogen clean-up membrane to remove CO from simulated feed gas to single-cell PEMFC, employing Nafion as the polymer electrolyte membrane. Polarization and power density measurements and gas chromatography showed a clear effect of separating the CO from the gas mixture; the performance and durability of the fuel cell was thereby significantly improved.

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In-situ investigation on the CO tolerance of carbon supported Pd–Pt electrocatalysts with low Pt content by electrochemical impedance spectroscopy

Cited by 20 publications

References 35 publications

Atomically Isolated Rh Sites within Highly Branched Rh₂Sb Nanostructures Enhance Bifunctional Hydrogen Electrocatalysis

Atomically Isolated Rh Sites within Highly Branched Rh₂Sb Nanostructures Enhance Bifunctional Hydrogen Electrocatalysis

Performance and endurance of a high temperature PEM fuel cell operated on methanol reformate

Al2O3 Disk Supported Si3N4 Hydrogen Purification Membrane for Low Temperature Polymer Electrolyte Membrane Fuel Cells

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In-situ investigation on the CO tolerance of carbon supported Pd–Pt electrocatalysts with low Pt content by electrochemical impedance spectroscopy

Cited by 20 publications

References 35 publications

Atomically Isolated Rh Sites within Highly Branched Rh2Sb Nanostructures Enhance Bifunctional Hydrogen Electrocatalysis

Atomically Isolated Rh Sites within Highly Branched Rh2Sb Nanostructures Enhance Bifunctional Hydrogen Electrocatalysis

Performance and endurance of a high temperature PEM fuel cell operated on methanol reformate

Al2O3 Disk Supported Si3N4 Hydrogen Purification Membrane for Low Temperature Polymer Electrolyte Membrane Fuel Cells

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Product

Resources

About

Atomically Isolated Rh Sites within Highly Branched Rh₂Sb Nanostructures Enhance Bifunctional Hydrogen Electrocatalysis

Atomically Isolated Rh Sites within Highly Branched Rh₂Sb Nanostructures Enhance Bifunctional Hydrogen Electrocatalysis