Carbon nanotubes-supported colloidal Ag–Pd nanoparticles as electrocatalysts toward oxygen reduction reaction in alkaline electrolyte

Lee, Chien‐Liang; Chiou, Hsueh-Ping; Chang, Kun-Chuan; Huang, C.L.

doi:10.1016/j.ijhydene.2010.11.098

Cited by 36 publications

(15 citation statements)

References 23 publications

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“…Non‐Pt‐based bimetallic catalysts have now been considerably studied due to their high ORR activities that can be optimized by tuning the electronic structure correlated with d‐band center as well as by capitalizing on distinctive properties of each constituent metal. Pd, Ag, Au, and Ir‐based bimetallic ORR catalysts have been examined theoretically and experimentally, and Pd‐based bimetallics constitute the majority of non‐Pt bimetallic ORR catalysts (summarized in Table 1 ). Moreover, studies on bimetallic catalysts are extended to ternary alloys or trimetallic core‐shell catalysts and becoming a research area with promising potential …”

Section: Bimetallic or Multimetallic Catalystsmentioning

confidence: 99%

Non‐Pt Nanostructured Catalysts for Oxygen Reduction Reaction: Synthesis, Catalytic Activity and its Key Factors

Xia

Chen

et al. 2016

Advanced Energy Materials

170

107

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caused by electrochemical polarization, Ohmic polarization and mass transport polarization. [ 4 ] The electrochemical reaction occurring on the cathode is oxygen reduction reaction (ORR). It is kinetically much more sluggish as compared to anode reaction, thereby calling for effi cient ORR catalysts. [ 1 ] Basically for ORR catalysis there are two main pathways, i.e., direct 4e pathway (O 2 + 4H + + 4e − → 2H 2 O) and 2 by 2e pathway (O 2 + 2H + + 2e → H 2 O 2 , H 2 O 2 + 2H + + 2e → 2H 2 O), the latter of which ends up with H 2 O 2 generation in 2-electron pathway or H 2 O generation in 4-electron pathway, making the 4-electron pathway more efficient and desirable. [ 1,5 ] In the past few decades, Pt catalysts have been considered to be the best catalysts; however, typical problems facing Pt, including unsatisfactory long-term durability due to dissolution, methanol crossover and CO poisoning, are hindrances to mass application of PEMFC and make it a nontrivial issue to develop some novel cathode electrocatalysts. [ 6,7 ] Moreover, around half of the cost of PEMFC power system is the fuel cell stack cost, a large proportion of which stems from expensive Pt catalysts; unlike other stack components, Pt catalyst cost seems to be less affected by economies of sale due to the scarcity and increasing demand of Pt. [ 8 ] Many strategies have therefore been proposed to address these challenges. They can reasonably be classifi ed into two types, i.e., lowering the Pt concentration by mixing Pt with other metals to form Pt-based alloys [ 7,9 ] or Pt-skin/skeleton surface structures, [ 10,11 ] and developing non-Pt catalysts [ 12 ] or even metalfree catalysts. [ 13 ] Recently, a wide variety of non-Pt ORR catalysts have been intensively studied as substitutes for state-ofthe-art Pt or Pt-based catalysts. Monometallic catalysts such as Au, Ag with tunable particle size, morphology and preferential surface orientation have attracted growing attention due to their enhanced activities; in particular, monometallic catalysts supported on graphene or its derivatives are shown to have extraordinary catalytic performance and long-term durability since graphene, with its sp 2 -hybridized honeycomb structure, enhances mass transport and electron transfer, and the synergetic coupling between monometallic catalysts and graphene supports prevents the occurrence of particle dissolution and aggregation. [ 6,14 ] Similarly, metal chalcogenides grown on (heteroatom-doped) graphenes have noticeably higher ORR activities relative to unsupported counterparts due to the Pt-based electrocatalysts for the oxygen reduction reaction (ORR) are the topic of extensive and intensive research since a few decades. Nevertheless, the scarcity of these Pt-based electrocatalysts, their high cost and unsatisfactory durability are the primary hindrances to their further commercialization. In recent years, non-Pt electrocatalysts have garnered considerable interest as alternatives to Pt-based catalysts for the ORR. This review highlights the synthesis, catalyti...

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Section: Bimetallic or Multimetallic Catalystsmentioning

confidence: 99%

Non‐Pt Nanostructured Catalysts for Oxygen Reduction Reaction: Synthesis, Catalytic Activity and its Key Factors

Xia

Chen

et al. 2016

Advanced Energy Materials

170

107

View full text Add to dashboard Cite

show abstract

“…However, the inexpensive Ag nanoparticles have been shown to have higher stability than pure Pt cathodes during long-term operation. Lee et al [238] supported AgPd alloy on multiwalled carbon nanotubes and found that the ORR proceeded through a two-electron pathway, while according to other authors the ORR on AgPd alloy was a four-electron process [239,240]. In alkaline medium the electrode reaction kinetics is higher than that in the acidic medium, enabling the use of Pt-free catalysts.…”

Section: Pdag Alloysmentioning

confidence: 99%

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

2015

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This review selectively summarizes the latest developments in the Pd-based cataysts for low temperature proton exchange membrane fuel cells, especially in the application of formic acid oxidation, alcohol oxidation and oxygen reduction reaction. The advantages and shortcomings of the Pd-based catalysts for electrocatalysis are analyzed. The influence of the structure and morphology of the Pd materials on the performance of the Pd-based catalysts were described. Finally, the perspectives of future trends on Pd-based catalysts for different applications were considered.

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“…50 mV less than with ER/PdCo-GO, and ER/PdCotGO exhibits a larger current density than ER/PdCo-GO in every constant rotation speed. To calculate the number of transferred electrons (n) per O 2 molecule involved in the O 2 reduction at each of the electrodes, the KouteckyeLevich equation (1) had been used [54]:…”

Section: The Kinetic Studies For O 2 Reductionmentioning

confidence: 99%

Thiolated graphene oxide-supported palladium cobalt alloyed nanoparticles as high performance electrocatalyst for oxygen reduction reaction

Yun

Ahmed

2015

Journal of Power Sources

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Carbon nanotubes-supported colloidal Ag–Pd nanoparticles as electrocatalysts toward oxygen reduction reaction in alkaline electrolyte

Cited by 36 publications

References 23 publications

Non‐Pt Nanostructured Catalysts for Oxygen Reduction Reaction: Synthesis, Catalytic Activity and its Key Factors

Non‐Pt Nanostructured Catalysts for Oxygen Reduction Reaction: Synthesis, Catalytic Activity and its Key Factors

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

Thiolated graphene oxide-supported palladium cobalt alloyed nanoparticles as high performance electrocatalyst for oxygen reduction reaction

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