A TiN@C core–shell support for improving Pt catalyst corrosion resistance

Zhang, Hongyu; Liu, Jia; Li, Xin; Duan, Xiao; Yuan, Mengchen; Cao, Feng; Kim, Sun; Zhang, Yunbo; Wang, Ying; Gu, Zheng‐Bin; Li, Jia; Liu, Jianguo

doi:10.1039/d2ra02569h

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…21 When integrated with traditional carbon support, the strong metal support interaction (SMSI) aided by TiN restricts the Pt atoms to accelerate the formation of carbon corrosion. 22,23 On the other hand, to maximize the catalytic activity, multiple strategies such as increasing the number of metal active sites on the catalyst surface, preparing single-atom metal particles, and support materials with high surface area also have been put forward. Further, several surface engineering strategies are reported to enhance Pt-carbon-based electrocatalysts for ORR, such as deploying surface strain effect, defect sites (adsorption site/coordination number effect), foreign/heteroatom doping, and exposing favorable crystal facets in the catalyst structure, etc.…”

Section: ■ Introductionmentioning

confidence: 99%

“…A theoretical investigation conducted by Kwon et al predicted that the stability of a single Pt atom absorbed on the TiN surface is many folds higher than those supported on graphite and graphene surfaces due to the large degree of charge transfer from Ti to Pt atoms . When integrated with traditional carbon support, the strong metal support interaction (SMSI) aided by TiN restricts the Pt atoms to accelerate the formation of carbon corrosion. , On the other hand, to maximize the catalytic activity, multiple strategies such as increasing the number of metal active sites on the catalyst surface, preparing single-atom metal particles, and support materials with high surface area also have been put forward. Further, several surface engineering strategies are reported to enhance Pt-carbon-based electrocatalysts for ORR, such as deploying surface strain effect, defect sites (adsorption site/coordination number effect), foreign/heteroatom doping, and exposing favorable crystal facets in the catalyst structure, etc. − Among these approaches, the introduction of hetero atoms such as nitrogen (N), sulfur (S), and fluorine into the catalyst structure has been demonstrated more frequently for both Pt-based catalysts and carbon-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Durable Electrocatalyst Support Materials Based on N-Doped Mesoporous Carbon Nanofibers with Titanium Nitride Overlay Coating for High-Performance Proton Exchange Membrane Fuel Cells

Ponnusamy,

Panthalingal,

Badhirappan

et al. 2024

ACS Appl. Nano Mater.

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Sustainable endurance of the membrane electrode assembly (MEA) is a major obstacle that hinders the widespread commercialization of PEM fuel cell (PEMFC) technology. Herein, we have successfully demonstrated the construction of an efficient PEMFC using MEAs based on durable N-doped mesoporous carbon nanofibers (g-C 3 N 4 /m-PCNFs) functionalized with a thin overlay coating of titanium nitride (TiN) as catalyst support materials with well-distributed 2−3 nm Pt electrocatalysts (Pt/ TiN/g-C 3 N 4 /m-PCNFs), which could significantly improve the carbon corrosion resistance and inhibit electrocatalyst degradation. Surface modification on the carbon support backbone using Ndoping with g-C 3 N 4 and Ti−N−C moieties provides strong metal support interactions to the catalyst layer on the MEA, facilitating ORR activity and stability. The surface-engineered Pt/TiN/g-C 3 N 4 /m-PCNFs exhibited outstanding electrocatalytic performance (electrochemical surface area (ECSA) = 95 m 2 /g) compared to commercial Pt/C (ECSA = 47 m 2 /g) and showed excellent durability with 93% retention in current density after 30,000 s and minor change in activity even after 10,000 potential sweeps. Compared to the commercial Pt/C electrocatalyst (151 mW/cm 2 ), the Pt/TiN/g-C 3 N 4 /m-PCNF-based membrane electrode assembly exhibited 2 times higher power density (330 mW/cm 2 ) and current density (919 mA/cm 2 ) during single PEMFC testing owing to the favorable mass transport due to the accessible mesoporous structure and high specific surface area, N-doping, uniform distribution of Pt nanoparticles, and abundant active sites on the support material. TiN coating enhanced the oxidative/corrosion resistance of the Pt/TiN/g-C 3 N 4 /m-PCNFs, which is reflected in the short term durability assessment, where the corresponding MEA exhibited only 0.4% drop in the peak power density even after 8 h of durability testing under PEMFC conditions. Therefore, Pt/TiN/g-C 3 N 4 /m-PCNFs are believed to create a paradigm shift in developing robust electrocatalyst support materials toward durable PEMFCs.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Durable Electrocatalyst Support Materials Based on N-Doped Mesoporous Carbon Nanofibers with Titanium Nitride Overlay Coating for High-Performance Proton Exchange Membrane Fuel Cells

Ponnusamy,

Panthalingal,

Badhirappan

et al. 2024

ACS Appl. Nano Mater.

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“…Researchers have proposed different strategies. Introducing additional elements [ 14 , 15 , 16 ], modulating the morphologies of electrocatalysts [ 17 , 18 , 19 ], and adjusting engineering parameters for CL [ 20 , 21 , 22 , 23 ] have been proven effective, and considerable progress has been achieved.…”

Section: Introductionmentioning

confidence: 99%

Advances in Low Pt Loading Membrane Electrode Assembly for Proton Exchange Membrane Fuel Cells

et al. 2023

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Hydrogen has the potential to be one of the solutions that can address environmental pollution and greenhouse emissions from traditional fossil fuels. However, high costs hinder its large-scale commercialization, particularly for enabling devices such as proton exchange membrane fuel cells (PEMFCs). The precious metal Pt is indispensable in boosting the oxygen reduction reaction (ORR) in cathode electrocatalysts from the most crucial component, i.e., the membrane electrode assembly (MEA). MEAs account for a considerable amount of the entire cost of PEMFCs. To address these bottlenecks, researchers either increase Pt utilization efficiency or produce MEAs with enhanced performance but less Pt. Only a few reviews that explain the approaches are available. This review summarizes advances in designing nanocatalysts and optimizing the catalyst layer structure to achieve low-Pt loading MEAs. Different strategies and their corresponding effectiveness, e.g., performance in half-cells or MEA, are summarized and compared. Finally, future directions are discussed and proposed, aiming at affordable, highly active, and durable PEMFCs.

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Enhancing the performance of platinum group metal-based electrocatalysts through nonmetallic element doping

Li,

Wang,

Yao

et al. 2024

Chinese Journal of Catalysis

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A TiN@C core–shell support for improving Pt catalyst corrosion resistance

Abstract: TiN@C composite support with high corrosion resistance improves catalyst durability because of SMSI between the Pt and N site in TiN.

Cited by 3 publications

References 32 publications

Durable Electrocatalyst Support Materials Based on N-Doped Mesoporous Carbon Nanofibers with Titanium Nitride Overlay Coating for High-Performance Proton Exchange Membrane Fuel Cells

Durable Electrocatalyst Support Materials Based on N-Doped Mesoporous Carbon Nanofibers with Titanium Nitride Overlay Coating for High-Performance Proton Exchange Membrane Fuel Cells

Advances in Low Pt Loading Membrane Electrode Assembly for Proton Exchange Membrane Fuel Cells

Enhancing the performance of platinum group metal-based electrocatalysts through nonmetallic element doping

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