Tuning Nb–Pt Interactions To Facilitate Fuel Cell Electrocatalysis

Ghoshal, Shraboni; Jia, Qingying; Bates, Michael K.; Li, Jingkun; Xu, Chunchuan; Gath, Kerrie; Yang, Jun; Waldecker, James; Che, Haiying; Liang, Wentao; Meng, Guangnan; Ma, Zi-Feng; Mukerjee, Sanjeev

doi:10.1021/acscatal.7b01061

Cited by 53 publications

(43 citation statements)

References 65 publications

(110 reference statements)

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“…Furthermore, it is noticed that the determined ECSA of the pristine Pt/C catalysts is smaller than their ECSA measured in acidic media 21 . The same observation has been made previously 35 , but…”

Section: Comparison Of Different Pt/c Catalysts For Adt Measurements supporting

confidence: 85%

“…The CVs display the typical features of Pt with hydrogen underpotential deposition (Hupd), double layer region, and Pt oxidation and reduction in the potential range of 0.15-1.10 VRHE. Also the CO stripping curves are similar to their counterparts recorded in conventional electrochemical cells 35 .…”

Section: Comparison Of Different Pt/c Catalysts For Adt Measurements supporting

confidence: 68%

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Carbon-supported Platinum Electrocatalysts probed in a Gas Diffusion Setup with Alkaline Environment: how Particle Size and Mesoscopic Environment influence the Degradation Mechanism

Alinejad¹,

Quinson²,

Schröder³

et al. 2020

Preprint

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In this work, we investigate the stability of four different types of Pt/C fuel cell catalysts upon applying accelerated degradation tests (ADTs) in a gas diffusion electrode (GDE) setup equipped with an anion exchange membrane (AEM). In contrast to previous investigations exposing the catalysts to liquid electrolyte, the GDE setup provides a realistic three-phase boundary of the reactant gas, catalyst and ionomer which enables reactant transport rates close to real fuel cells. Therefore, the GDE setup mimics the degradation of the catalyst under more realistic reaction conditions as compared to conventional electrochemical cells. Combining the determination of the loss in electrochemically active surface area (ECSA) of the Pt/C catalysts via CO stripping measurements with the change in particle size distribution determined by small-angle X-ray scattering (SAXS) measurements, we demonstrate that i) the degradation mechanism depends on the investigated Pt/C catalyst and might indeed be different to the one observed in conventional electrochemical cells, ii) degradation is increased in an oxygen gas atmosphere (as compared to an inert atmosphere), and iii) the observed degradation mechanism depends on the mesoscopic environment of the active phase. The measurements indicate an increased particle growth if small and large particles are immobilized next to each other on the same carbon support flakes as compared to a simple mix of two catalysts with small and large particles, respectively.

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Section: Comparison Of Different Pt/c Catalysts For Adt Measurements supporting

confidence: 85%

Section: Comparison Of Different Pt/c Catalysts For Adt Measurements supporting

confidence: 68%

Carbon-supported Platinum Electrocatalysts probed in a Gas Diffusion Setup with Alkaline Environment: how Particle Size and Mesoscopic Environment influence the Degradation Mechanism

Alinejad¹,

Quinson²,

Schröder³

et al. 2020

Preprint

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“…Ghoshal et al [1] investigated metallic Nb and Nb oxide to support Pt. [8] They found strong ligand effect from metallic Nb to suppress the OH formation on Pt, thus enhancing the catalyst ORR activity. More recently, Ma et al [2] has reported a selective Pt head deposition on NbO x nails that was embedded in porous carbon.…”

Section: Introductionmentioning

confidence: 99%

Dense Niobium Oxide Coating on Carbon Black as a Support to Platinum Electrocatalyst for Oxygen Reduction

Jasim

Al‐Salihi

et al. 2020

ChemistrySelect

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Carbon black (CB) is commonly used to support Pt as an electrocatalyst in fuel cells. However, it is easily corroded in electrochemical reactions, such as in the oxygen reduction reaction (ORR), leading to catalyst degradation. In this paper, we report results of protecting the CB using an ultrathin 5 nm film of niobium oxide conformally coated on the CB using a new coating technique. Electrochemical test in ORR shows only a 1.7 % activity loss after 5000 cycles, demonstrating an excellent durability of the electrocatalyst. Compared to the electrocatalyst without niobium oxide coating, it shows a 25 mV improvement in half-wave potentials, indicative of a better kinetics. A positive shift in binding energy was found in Pt 4 f, implying electron delocalization has occurred when Pt is interfaced with the niobium oxide support. The activity enhancement is attributed to the electronic structure change in the electrocatalyst as a result of metal-support interactions.

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“…Alloying Pt with a non-noble metal is an effective strategy for lowering Pt loading, decreasing PEMFC costs, as well as improving ORR activity. Recently, Goshal et al [18], and Jia et al [19] demonstrated that platinum and niobium form an alloy with a high potential to enhance ORR activity. Pt interacts with Nb and NbO x , and Nb contributes to the suppression of Pt dissolution due to strong ligand effects, which enhance catalytic activity toward ORR [19].…”

Section: Introductionmentioning

confidence: 99%

“…Pt interacts with Nb and NbO x , and Nb contributes to the suppression of Pt dissolution due to strong ligand effects, which enhance catalytic activity toward ORR [19]. Pt-Nb/ NbO x loaded on carbon was tested as an electrocatalyst and demonstrated high activity and durability for both ORR and hydrogen oxidation reaction (HOR) [18]. This new electrocatalyst has significant potential for further improvement but more studies are required to better understand the Pt-Nb and Pt-NbO x interactions and tailor them to improve the catalyst's performance.…”

Section: Introductionmentioning

confidence: 99%

Nano-sized Pt–NbOx supported on TiN as cost-effective electrocatalyst for oxygen reduction reaction

Daudt

Poozhikunnath

et al. 2020

Mater Renew Sustain Energy

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Proton exchange membrane fuel cells (PEMFC) play a key role for sustainable energy; however, catalyst degradation remains one of the main challenges for competing with traditional energy technologies. The Pt/C commercially available electrocatalysts are susceptible to Pt dissolution and carbon support corrosion. In this context, we design a Pt–NbOx catalyst supported on TiN nanoparticles as an alternative electrocatalyst for the oxygen reduction reaction (ORR). The use of Pt–NbOx reduces materials’ costs by lowering the required platinum loading and improving catalyst performance. The TiN support is selected to improve support stability. The electrocatalyst is successfully synthesized by a one-step flame spray process called reactive spray deposition technology. Electrocatalyst with two different very low Pt loadings (0.032 mg cm−2 and 0.077 mg cm−2) are investigated and their performance as cathode is evaluated by the rotating disk electrode method. The new electrocatalyst based on Pt–NbOx supported on TiN has ORR performance that is comparable to the state-of-the-art Pt/C electrocatalyst. A half-wave potential of 910 mV was observed in the polarization curves, as well as a mass activity of 0.120 A∙mgPt−1 and a specific activity of 283 μA∙cmPt−2 at 0.9 V. These results demonstrate that Pt–NbOx on TiN electrocatalyst has the potential for replacing Pt/C cathode in PEMFC.

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Tuning Nb–Pt Interactions To Facilitate Fuel Cell Electrocatalysis

Cited by 53 publications

References 65 publications

Carbon-supported Platinum Electrocatalysts probed in a Gas Diffusion Setup with Alkaline Environment: how Particle Size and Mesoscopic Environment influence the Degradation Mechanism

Carbon-supported Platinum Electrocatalysts probed in a Gas Diffusion Setup with Alkaline Environment: how Particle Size and Mesoscopic Environment influence the Degradation Mechanism

Dense Niobium Oxide Coating on Carbon Black as a Support to Platinum Electrocatalyst for Oxygen Reduction

Nano-sized Pt–NbOx supported on TiN as cost-effective electrocatalyst for oxygen reduction reaction

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