Tuning Nb-Pt Interactions to Facilitate Fuel Cell Electrocatalysis

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

doi:10.1021/acscatal.7b01061

Tuning Nb-Pt Interactions to Facilitate Fuel Cell Electrocatalysis

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

61 Citations (Scopus)

Abstract

High stability, availability of multiple oxidation states, and accessibility within a wide electrochemical window are the prime features of Nb that make it a favorable candidate for electrocatalysis, especially when it is combined with Pt. However, Nb has been used as a support in the form of oxides in all previously reported Pt-Nb electrocatalysts, and no Pt-Nb alloying phase has been demonstrated hitherto. Herein, we report a multifunctional Pt-Nb composite (PtNb/NbO_x-C) where Nb exists both as an alloying component with Pt and as an oxide support and is synthesized by means of a simple wet chemical method. In this work, the Pt-Nb alloy phase has been firmly verified with the help of multiple spectroscopic methods. This allows for the experimental evidence of the theoretical prediction that Pt-Nb alloy interactions improve the oxygen reduction reaction (ORR) activity of Pt. In addition, such a combination of multiphase Nb brings up myriad features encompassing increased ORR durability, immunity to phosphate anion poisoning, enhanced hydrogen oxidation reaction (HOR) activity, and oxidative carbon monoxide (CO) stripping, making this electrocatalyst useful in multiple fuel cell systems. (Figure Presented).

Original language	English
Pages (from-to)	4936-4946
Number of pages	11
Journal	ACS Catalysis
Volume	7
Issue number	8
DOIs	https://doi.org/10.1021/acscatal.7b01061
Publication status	Published - 4 Aug 2017
Externally published	Yes

Keywords

Pt-Nb alloy
electronic effect
hydrogen oxidation reaction
in situ X-ray absorption spectroscopy
oxygen reduction reaction

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10.1021/acscatal.7b01061

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title = "Tuning Nb-Pt Interactions to Facilitate Fuel Cell Electrocatalysis",

abstract = "High stability, availability of multiple oxidation states, and accessibility within a wide electrochemical window are the prime features of Nb that make it a favorable candidate for electrocatalysis, especially when it is combined with Pt. However, Nb has been used as a support in the form of oxides in all previously reported Pt-Nb electrocatalysts, and no Pt-Nb alloying phase has been demonstrated hitherto. Herein, we report a multifunctional Pt-Nb composite (PtNb/NbOx-C) where Nb exists both as an alloying component with Pt and as an oxide support and is synthesized by means of a simple wet chemical method. In this work, the Pt-Nb alloy phase has been firmly verified with the help of multiple spectroscopic methods. This allows for the experimental evidence of the theoretical prediction that Pt-Nb alloy interactions improve the oxygen reduction reaction (ORR) activity of Pt. In addition, such a combination of multiphase Nb brings up myriad features encompassing increased ORR durability, immunity to phosphate anion poisoning, enhanced hydrogen oxidation reaction (HOR) activity, and oxidative carbon monoxide (CO) stripping, making this electrocatalyst useful in multiple fuel cell systems. (Figure Presented).",

keywords = "Pt-Nb alloy, electronic effect, hydrogen oxidation reaction, in situ X-ray absorption spectroscopy, oxygen reduction reaction",

author = "Shraboni Ghoshal and Qingying Jia and Bates, \{Michael K.\} and Jingkun Li and Chunchuan Xu and Kerrie Gath and Jun Yang and James Waldecker and Haiying Che and Wentao Liang and Guangnan Meng and Ma, \{Zi Feng\} and Sanjeev Mukerjee",

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doi = "10.1021/acscatal.7b01061",

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T1 - Tuning Nb-Pt Interactions to Facilitate Fuel Cell Electrocatalysis

AU - Ghoshal, Shraboni

AU - Jia, Qingying

AU - Bates, Michael K.

AU - Li, Jingkun

AU - Xu, Chunchuan

AU - Gath, Kerrie

AU - Yang, Jun

AU - Waldecker, James

AU - Che, Haiying

AU - Liang, Wentao

AU - Meng, Guangnan

AU - Ma, Zi Feng

AU - Mukerjee, Sanjeev

PY - 2017/8/4

Y1 - 2017/8/4

N2 - High stability, availability of multiple oxidation states, and accessibility within a wide electrochemical window are the prime features of Nb that make it a favorable candidate for electrocatalysis, especially when it is combined with Pt. However, Nb has been used as a support in the form of oxides in all previously reported Pt-Nb electrocatalysts, and no Pt-Nb alloying phase has been demonstrated hitherto. Herein, we report a multifunctional Pt-Nb composite (PtNb/NbOx-C) where Nb exists both as an alloying component with Pt and as an oxide support and is synthesized by means of a simple wet chemical method. In this work, the Pt-Nb alloy phase has been firmly verified with the help of multiple spectroscopic methods. This allows for the experimental evidence of the theoretical prediction that Pt-Nb alloy interactions improve the oxygen reduction reaction (ORR) activity of Pt. In addition, such a combination of multiphase Nb brings up myriad features encompassing increased ORR durability, immunity to phosphate anion poisoning, enhanced hydrogen oxidation reaction (HOR) activity, and oxidative carbon monoxide (CO) stripping, making this electrocatalyst useful in multiple fuel cell systems. (Figure Presented).

AB - High stability, availability of multiple oxidation states, and accessibility within a wide electrochemical window are the prime features of Nb that make it a favorable candidate for electrocatalysis, especially when it is combined with Pt. However, Nb has been used as a support in the form of oxides in all previously reported Pt-Nb electrocatalysts, and no Pt-Nb alloying phase has been demonstrated hitherto. Herein, we report a multifunctional Pt-Nb composite (PtNb/NbOx-C) where Nb exists both as an alloying component with Pt and as an oxide support and is synthesized by means of a simple wet chemical method. In this work, the Pt-Nb alloy phase has been firmly verified with the help of multiple spectroscopic methods. This allows for the experimental evidence of the theoretical prediction that Pt-Nb alloy interactions improve the oxygen reduction reaction (ORR) activity of Pt. In addition, such a combination of multiphase Nb brings up myriad features encompassing increased ORR durability, immunity to phosphate anion poisoning, enhanced hydrogen oxidation reaction (HOR) activity, and oxidative carbon monoxide (CO) stripping, making this electrocatalyst useful in multiple fuel cell systems. (Figure Presented).

KW - Pt-Nb alloy

KW - electronic effect

KW - hydrogen oxidation reaction

KW - in situ X-ray absorption spectroscopy

KW - oxygen reduction reaction

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DO - 10.1021/acscatal.7b01061

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EP - 4946

JO - ACS Catalysis

JF - ACS Catalysis

IS - 8

ER -

Tuning Nb-Pt Interactions to Facilitate Fuel Cell Electrocatalysis

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