Optimizing metal-support interphase for efficient fuel cell oxygen reduction reaction catalyst

Nechiyil, Divya; Garapati, Meenakshi Seshadhri; Shende, Rashmi Chandrabhan; Joulie, Sébastien; Neumeyer, David; Bacsa, Revathi; Puech, Pascal; Bacsa, Wolfgang

doi:10.1016/j.jcis.2019.11.015

Cited by 13 publications

(9 citation statements)

References 50 publications

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“…The I D / I D′ band intensity ratios of polymer wrapped samples decreased after metal anchoring. This observation confirms the strong binding of metal nanoparticles to the polymer wrapped supports …”

Section: Resultssupporting

confidence: 81%

“…The ECSAs of Pt/NSPNT and Pt/PX_NSPNT (X = 1, 3, 6, and 9 wt % PVPA) are higher than that of Pt/C, which can signify that Pt nanoparticles have strong bonding and uniform distribution over the nitrogen and sulfur co-doped PNT. 37 Moreover, the enhanced ECSAs of Pt/ P1_NSPNT, Pt/P3-NSPNT, Pt/P6_NSPNT, and Pt/ P9_NSPNT electrocatalysts can be attributed to increasing of triple-phase boundaries density due to PVPA wrapping over the NSPNT support material in addition to the strong bonding and uniform distribution of Pt NPs. The highest ECSA of Pt/ P6_NSPNT corroborates that 6 wt.% PVPA could significantly expand the TPB density network, thereby facilitating Ptutilization efficiency of the catalyst.…”

Section: Resultsmentioning

confidence: 99%

“…This observation confirms the strong binding of metal nanoparticles to the polymer wrapped supports. 37 Transmission electron microscopy imaging was carried out further to analyze the morphological changes of the polymer encapsulated carbon nanotubes. TEM images were acquired using a Cs aberration-corrected Tecnai G 2 (FEI) transmission electron microscope operated at an acceleration electron voltage of 100 kV.…”

Section: Resultsmentioning

confidence: 99%

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Proton-Conducting Polymer Wrapped Cathode Catalyst for Enhancing Triple-Phase Boundaries in Proton Exchange Membrane Fuel Cells

Garapati

Nechiyil

Joulie

et al. 2021

ACS Appl. Energy Mater.

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The performance of proton exchange membrane fuel cells (PEMFCs) depends on the oxygen reduction reaction (ORR) kinetics and durability of the cathode catalyst. This can be achieved by tailoring cathode structure to increase the number of triple-phase boundaries. Herein, different weight percentages of proton-conducting poly(vinylphosphonic acid) (PVPA) wrapped nitrogen and sulfur dual atoms doped longitudinally exfoliated carbon nanotubes (PX_NSPNT, X-1, 3, 6, and 9 wt %) is synthesized as the catalyst support for Pt/Pt-alloy nanoparticles (Pt/PX_NSPNT) to improve the triplephase boundary density and durability of cathode catalyst. Raman spectroscopy and transmission electron microscopy analysis infer that polymer coating and N−S dopant sites provide the anchoring sites for Pt nanoparticles, which can enhance the durability of the catalyst. Besides, half-cell studies shows that with increasing PVPA wt % (until 6 wt %), the activity of the electrocatalyst also increases, suggesting PVPA has contributed to enhancing the diffusion of ions and masstransfer kinetics. The accelerated durability test signifies the robustness of Pt/P6_NSPNT catalyst, which can retain 80% of its electrochemical active surface area after 15000 potential cycles. In single-cell studies, Pt/P6_NSPNT and Pt−Co/P6_NSPNT cathode electrocatalyst deliver power densities of 923 and 1090 mW cm −2 , respectively, at 60 °C, which is the highest among all other PVPA weight percentages, Pt/NSPNT, and commercial Pt/C catalyst. The methodical variation of PVPA wt % helps to find the optimum proton-conducting polymer content on the electrocatalyst for achieving high-performance and durability of PEMFC.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Proton-Conducting Polymer Wrapped Cathode Catalyst for Enhancing Triple-Phase Boundaries in Proton Exchange Membrane Fuel Cells

Garapati

Nechiyil

Joulie

et al. 2021

ACS Appl. Energy Mater.

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“…Platinum is the most active metal catalyst for ORR of the entire periodic table; however, its use in bulk has been replaced by its use in the form of carbon-supported nanoparticles, which face, among other problems, important challenges in terms of stability and durability. There are different proposals to reduce the instability of the Pt/C, one of the first is to change the use of carbon black as the supporting material to another with well-defined structure such as CNT [ 232 ], nitrogen, and sulfur-doped CNT [ 233 ], or the use of N-doped graphene-TiO 2 [ 234 ], those changes would enable avoiding problems related to corrosion of the carbon support. On the other hand, the work of Ham et al [ 235 ] proposed the use of Pt nanoparticles covered by an S-doped carbon layer to accomplish a durable and active catalyst compared with Pt/C ( Figure 13 ).…”

Section: Electrocatalysts and Electrodesmentioning

confidence: 99%

Proton Exchange Membrane Fuel Cells (PEMFCs): Advances and Challenges

Tellez-Cruz¹,

et al. 2021

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The study of the electrochemical catalyst conversion of renewable electricity and carbon oxides into chemical fuels attracts a great deal of attention by different researchers. The main role of this process is in mitigating the worldwide energy crisis through a closed technological carbon cycle, where chemical fuels, such as hydrogen, are stored and reconverted to electricity via electrochemical reaction processes in fuel cells. The scientific community focuses its efforts on the development of high-performance polymeric membranes together with nanomaterials with high catalytic activity and stability in order to reduce the platinum group metal applied as a cathode to build stacks of proton exchange membrane fuel cells (PEMFCs) to work at low and moderate temperatures. The design of new conductive membranes and nanoparticles (NPs) whose morphology directly affects their catalytic properties is of utmost importance. Nanoparticle morphologies, like cubes, octahedrons, icosahedrons, bipyramids, plates, and polyhedrons, among others, are widely studied for catalysis applications. The recent progress around the high catalytic activity has focused on the stabilizing agents and their potential impact on nanomaterial synthesis to induce changes in the morphology of NPs.

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“…23,40,41 The interaction between Pt and N has been proposed to increase the electron affinity of the support, alleviate the migration and aggregation of the Pt active sites, facilitate the electron donating behavior of Pt, and represent great advantages of an ORR catalyst. [42][43][44] Electrochemical activity towards the oxygen reduction reaction (ORR)…”

Section: Structural Characterization and Chemical Composition Analysi...mentioning

confidence: 99%

A three-dimensional ordered honeycomb nanostructure anchored with Pt–N active sites via self-assembly of a block copolymer: an efficient electrocatalyst towards the oxygen reduction reaction in fuel cells

Wang

Yang

et al. 2022

J. Mater. Chem. A

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Optimizing metal-support interphase for efficient fuel cell oxygen reduction reaction catalyst

Cited by 13 publications

References 50 publications

Proton-Conducting Polymer Wrapped Cathode Catalyst for Enhancing Triple-Phase Boundaries in Proton Exchange Membrane Fuel Cells

Proton-Conducting Polymer Wrapped Cathode Catalyst for Enhancing Triple-Phase Boundaries in Proton Exchange Membrane Fuel Cells

Proton Exchange Membrane Fuel Cells (PEMFCs): Advances and Challenges

A three-dimensional ordered honeycomb nanostructure anchored with Pt–N active sites via self-assembly of a block copolymer: an efficient electrocatalyst towards the oxygen reduction reaction in fuel cells

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