Electronic structure modification of platinum on titanium nitride resulting in enhanced catalytic activity and durability for oxygen reduction and formic acid oxidation

Yang, Sungeun; Chung, Dong Young; Tak, Young Joo; Kim, Jiwhan; Han, Haksu; Yu, Jong-Sung; Soon, Aloysius; Sung, Yung Eun; Lee, Hyunjoo

doi:10.1016/j.apcatb.2015.02.033

Cited by 65 publications

(30 citation statements)

References 57 publications

(73 reference statements)

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“…Based on this approach, we have also attempted to interpret an anomaly found in surface energies of bcc Li by analyzing the strong influence of the second-and third-nearest-neighbor bonds to its surface energies. Notwithstanding, it is expected that the EPP-derived surface energy database in this work serves as a good platform to improve the mathematical construct for a more realistic model for real applications, e.g., supported metal nanocatalysts [47,48].…”

Section: Discussionmentioning

confidence: 99%

Exploring stereographic surface energy maps of cubic metals via an effective pair-potential approach

et al. 2016

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A fast and efficient way to calculate and generate an accurate surface energy database (of more than several million surface energy data points) for all bcc and fcc metals is proposed based on an effective pair-wise-potential model. The accuracy of this model is rigorously tested and verified by employing density functional theory calculations, which shows good agreement within a mean absolute error of 0.03 eV/atom. The surface energy database generated by this model is then visualized and mapped in various ways; namely, the surface energy as a function of relative orientation, a orientation-dependent stereographic projection (the so-called Wulff net), and Gibbs-Wulff construction of the equilibrium crystal shape, for comparison and analysis. The Wulff nets (drawn with several million surface energy data points) provide us with characteristic surface energy maps of these cubic metals. In an attempt to explain the surface energy anomaly in bcc Li, we demonstrate how our effective-pair-potential-derived Wulff net can clearly discriminate the strong influence of the second-and third-nearest-neighbor bonds on the high-Miller-index surface energetics of bcc Li.

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Section: Discussionmentioning

confidence: 99%

Exploring stereographic surface energy maps of cubic metals via an effective pair-potential approach

et al. 2016

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“…27 However, the formic acid crossover still significantly limits the performance of DFAFCs. 3,[29][30][31] Formic acid tolerance was measured using Pt and Ru x Se y deposited onto the oxide-carbon composite substrate (TiO 2 /C) in the study conducted by L. Timperman et al 31 The formic acid tolerance was better in the Ru x Se y /C catalyst when compared with that in the Ru x Se y /TiO 2 /C catalyst. 3,[29][30][31] Formic acid tolerance was measured using Pt and Ru x Se y deposited onto the oxide-carbon composite substrate (TiO 2 /C) in the study conducted by L. Timperman et al 31 The formic acid tolerance was better in the Ru x Se y /C catalyst when compared with that in the Ru x Se y /TiO 2 /C catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…28 Several studies have reported on the cathode electrocatalyst, including the Pt-based catalyst modification and non-Pt based catalyst development for DFAFC. 3,[29][30][31] Formic acid tolerance was measured using Pt and Ru x Se y deposited onto the oxide-carbon composite substrate (TiO 2 /C) in the study conducted by L. Timperman et al 31 The formic acid tolerance was better in the Ru x Se y /C catalyst when compared with that in the Ru x Se y /TiO 2 /C catalyst. The Ru x Se y catalyst was more tolerant toward formic acid as compared with the Pt-based catalyst.…”

Section: Introductionmentioning

confidence: 99%

Performance of direct formic acid fuel cell using transition metal‐nitrogen‐doped carbon nanotubes as cathode catalysts

et al. 2019

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Summary The application of nonprecious metal catalysts, such as iron (Fe) and cobalt (Co) catalyst, to direct liquid fuel cells (DLFCs), especially in direct methanol fuel cells, has been widely investigated. However, the application of such non‐Pt catalysts as cathode catalysts in direct formic acid fuel cell (DFAFC) operations has not yet been investigated. This study intends to evaluate the formic acid tolerance of such catalysts in case of oxygen reduction reaction. In addition, we investigate their performances in DFAFC using the Fe‐ and Co‐nitrogen‐doped carbon nanotubes (Fe‐NCNT and Co‐NCNT) as the cathode catalysts and compare these performances with the commercial Pt/C catalyst. Herein, Fe‐NCNT and Co‐NCNT were synthesized using the conventional method by the pyrolysis of the multiwalled carbon nanotubes, dicyandiamide, and metal salt under the flow of N2 at 800°C. Both the Fe‐NCNT and Co‐NCNT catalysts exhibit higher formic acid tolerance when compared with that exhibited by the Pt/C catalyst. Further, single‐cell tests with hydrogen‐fed polymer electrolyte fuel cell (PEFC) and DFAFC operations were conducted under various operating conditions to compare the performances of the cells while using the prepared catalysts and the conventional Pt/C catalyst. The PEFC performances in both the Fe‐NCNT and Co‐NCNT catalysts were significantly low (94.9mW cm−2 for Fe‐NCNT and 164.0 mW cm−2 for Co‐NCNT at 60°C). Regardless, the Co‐NCNT catalyst exhibited a maximum power density of 160.7 mW cm−2 in DFAFC operated at 60°C and7‐M formic acid. This value is comparable with that for DFAFC with a Pt/C catalyst (128.9mW cm−2) and is considerably higher than that obtained for other DLFCs while using a non‐Pt catalyst. Therefore, the usage of a non‐Pt metal catalyst as the cathode catalyst is preferable in case of DFAFC.

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“…The mass activity (MA) and specific activity (SA) of the Pt-M bimetallic alloy nanoclusters can be calculated from the kinetic current density at 0.9 V vs. RHE. Figure 7a, b shows the bar chart comparison of MA and SA of Pt-M bimetallic alloy nanoclusters with selected Pt-based ORR electrocatalysts from recent literatures [18,32,[46][47][48][49][50][51][52][53][54][55][56]. Among the three Pt-M bimetallic alloy nanoclusters, Pt-Co has higher magnitude of MA (0.44 mA/μg) which meets the DOE target for 2020 [57].…”

Section: Resultsmentioning

confidence: 88%

Pt3M (M: Co, Ni and Fe) Bimetallic Alloy Nanoclusters as Support-Free Electrocatalysts with Improved Activity and Durability for Dioxygen Reduction in PEM Fuel Cells

et al. 2016

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Pt 3 M (M: Co, Ni and Fe) bimetallic alloy nanoclusters were synthesized by a novel and simple chemical reduction approach, and employed as the promising electrocatalyst to accelerate the kinetics of oxygen reduction reaction (ORR) for polymer electrolyte membrane fuel cells. From XRD, the positive shift of diffraction angle confirms the alloy formation between Pt and M and the elemental composition was confirmed by energy dispersive X-ray spectroscopy analysis. The nanocluster morphology and particle size was determined using scanning and transmission electron microscopy analysis. The ORR kinetic parameters for Pt-M electrocatalysts were calculated and compared with reported Pt/C catalysts. Among the Pt-M electrocatalysts, Pt-Co was found to be the most efficient catalyst having the higher mass and specific activity (at 0.9 V vs. RHE) of 0.44 mA/μg and 0.69 mA/cm 2 , respectively. The accelerated durability test reveals that the Pt-M bimetallic alloy nanoclusters retain appreciable surface area and mass activity after 8000 potential cycles confirms good long-term durability, and also competing with the reported benchmark ORR catalysts.

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Electronic structure modification of platinum on titanium nitride resulting in enhanced catalytic activity and durability for oxygen reduction and formic acid oxidation

Cited by 65 publications

References 57 publications

Exploring stereographic surface energy maps of cubic metals via an effective pair-potential approach

Exploring stereographic surface energy maps of cubic metals via an effective pair-potential approach

Performance of direct formic acid fuel cell using transition metal‐nitrogen‐doped carbon nanotubes as cathode catalysts

Pt3M (M: Co, Ni and Fe) Bimetallic Alloy Nanoclusters as Support-Free Electrocatalysts with Improved Activity and Durability for Dioxygen Reduction in PEM Fuel Cells

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