PtAu/C electrocatalysts as anodes for direct ammonia fuel cell

Silva, Júlio César M.; Silva, Sirlane G. da; Souza, R. F. B. de; Buzzo, Guilherme S.; Spinacé, Estevam V.; Neto, Almir Oliveira; Assumpção, M.H.M.T.

doi:10.1016/j.apcata.2014.11.015

Cited by 76 publications

(44 citation statements)

References 39 publications

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“…5 that the current density was about 15% higher for Pt 90 Ru 10 /C than Pt/C. The OCV and the maximum power density obtained using Pt/ C is in agreement with the previous publication [18]. Thus, Pt 90 Ru 10 /C showed the best fuel cell performance among all the catalysts synthesized in the present work in agreement with CV and CA experiments.…”

Section: Direct Ammonia Fuel Cellsupporting

confidence: 95%

“…1 shows the X-ray diffraction patterns of the carbon supported Pt and PtRu electrocatalysts. The broad peak at around 25 2q that is assigned to the (022) reflection of graphite in Vulcan XC-72 carbon [17,18]. The peaks at around 40, 46, 67, 81 2q are attributed to the (111), (200), (220) and (311) face centered cubic (fcc) reflections typical for bulk and nanostructured Pt [4,18].…”

Section: Resultsmentioning

confidence: 94%

“…The broad peak at around 25 2q that is assigned to the (022) reflection of graphite in Vulcan XC-72 carbon [17,18]. The peaks at around 40, 46, 67, 81 2q are attributed to the (111), (200), (220) and (311) face centered cubic (fcc) reflections typical for bulk and nanostructured Pt [4,18]. The diffraction peaks in the PtRu catalysts are shifted to higher 2q values with respect to the same reflections in Pt/C (Table 1), suggesting the platinum ruthenium alloy formation [27,28], however because the main (111) and (200) Pt reflections overlap with graphite reflection (101) at 45 2q in carbon Vulcan XC-72, the crystallite size analysis was done using (220) reflection and Scherrer equation [17,29].…”

Section: Resultsmentioning

confidence: 98%

“…DAFCs experiments were conducted using 1 M (NH 4 OH þ KOH) as already described in details elsewhere [3,4,10,18]. In these experiments, a single cell set at 50 C with an electrode area of 5 cm 2 was employed.…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of carbon supported platinum–ruthenium nanoparticles for ammonia electro-oxidation: Combined fuel cell and electrochemical approach

Silva¹,

Ntais²,

Teixeira‐Neto³

et al. 2017

International Journal of Hydrogen Energy

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Section: Direct Ammonia Fuel Cellsupporting

confidence: 95%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of carbon supported platinum–ruthenium nanoparticles for ammonia electro-oxidation: Combined fuel cell and electrochemical approach

Silva¹,

Ntais²,

Teixeira‐Neto³

et al. 2017

International Journal of Hydrogen Energy

Self Cite

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“…A number of recent studies focused on the development of electrocatalysts for AmER in alkaline solutions ,. Platinum and platinum‐based electrocatalysts are the most studied and applied material, however they suffer from deactivation and prone to poisoning by reaction intermediates, e. g. N ads .…”

Section: Introductionmentioning

confidence: 99%

Iridium−Rhodium Nanoparticles for Ammonia Oxidation: Electrochemical and Fuel Cell Studies

et al. 2017

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This study reports the use of carbon-supported IrRh/C electrocatalysts with different iridium-to-rhodium atomic ratios (0 : 100, 50 : 50, 70 : 30, 90 : 10, and 100 : 0) for ammonia electro-oxidation (AmER) in alkaline media. The materials prepared by using the sodium borohydride method showed a mean diameter of 4.5, 4.8, 4.2, and 4.5 nm for Ir/C, Ir 90 Rh 10 /C, Ir 70 Rh 30 /C, and Ir 50 Rh 50 /C, respectively. According to electrochemical and fuel cell experiments, the Ir 50 Rh 50 /C catalyst was the most promising towards AmER. This catalyst, which consisted predominantly of the metallic Ir/Rh phases, showed a 500 % higher current density and 55 % higher maximum power than that obtained for Ir/C. After 8 h galvanostatic electrolysis, 93 % of initial ammonia was degraded when using Ir 50 Rh 50 /C, whereas it was only 70 % with Ir/C. The high activity of the Ir 50 Rh 50 /C is attributed to a synergic effect of two metals at this iridium-to-rhodium ratio, which enhances the kinetics of AmER contributing towards ammonia dehydrogenation at lower potentials.

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Awakening (220) as One More Active Facet of PtMo Alloy via Single‐Atom Doping to Boost Ammonia Electrooxidation in Direct Ammonia Fuel Cell

Liu

Jiang

Wang

et al. 2023

Adv Funct Materials

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As the core of low‐temperature direct ammonia fuel cell (DAFC) technology, electrocatalytic ammonia oxidation reaction (AOR) has proven to be most active on platinum‐based catalysts. However, the AOR is extremely surface sensitive that only the Pt (200) facet exhibits high reaction activity, whereas other facets usually do not make contributions. Herein, the inert (220) surface of PtMo nano‐alloy is successfully awakened as one more active facet in addition to (200) via directional single‐atom Ni‐doping. The introduction of Ni triggers a targeted electron accumulation around Pt sites at the (220) facet that significantly reduces the AOR energy barrier while maintaining the activity of the (200) surface. With a greatly enlarged active surface, the Ni‐decorated PtMo catalyst exhibits a significantly facilitated AOR kinetics with a low onset potential of 0.49 V versus reversible hydrogen electrode and a superior peak current density of 94.96 A g−1 at 5 mV s−1. Notably, the DAFC equipped with such an electrocatalyst reaches a remarkable peak power density of 16.70 mW cm−2 at low temperatures. It is believed that this strategy sheds light on exploiting the intrinsic activity of Pt‐based electrocatalysts, and drives the low‐temperature DAFC technology to a more practical level.

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PtAu/C electrocatalysts as anodes for direct ammonia fuel cell

Cited by 76 publications

References 39 publications

Evaluation of carbon supported platinum–ruthenium nanoparticles for ammonia electro-oxidation: Combined fuel cell and electrochemical approach

Evaluation of carbon supported platinum–ruthenium nanoparticles for ammonia electro-oxidation: Combined fuel cell and electrochemical approach

Iridium−Rhodium Nanoparticles for Ammonia Oxidation: Electrochemical and Fuel Cell Studies

Awakening (220) as One More Active Facet of PtMo Alloy via Single‐Atom Doping to Boost Ammonia Electrooxidation in Direct Ammonia Fuel Cell

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