Ordered intracrystalline pores in planar molybdenum oxide for enhanced alkaline hydrogen evolution

Farjana Haque, Ali Zavabeti, Bao Yue Zhang, Robi S. Datta, Yuefeng Yin, Zhifeng Yi, Yichao Wang, Nasir Mahmood, Naresh Pillai, Nitu Syed, Hareem Khan, Azmira Jannat, Ning Wang, Nikhil Medhekar, Kourosh Kalantar-Zadeh, Jian Zhen Ou

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Molybdenum based compounds are an emerging class of non-metallic catalytic materials for the hydrogen evolution reaction (HER) in acidic media. However, most of them lose considerable catalytic performance and exhibit poor long-term stability in alkaline media. Here, planar molybdenum oxide, with high alkaline stability and ordered intracrystalline pores, is developed as the HER candidate. The pores with diameters in the order of ∼5-7 Å are HER-active, and appear after an NH4 + doping-driven phase transition from the orthorhombic to hexagonal phase. Such a unique structure facilitates the diffusion of ionic entities and water molecules to the HER sites and helps in the removal of gaseous products, therefore improving the surface active area and reaction kinetics. These intracrystalline pores also reduce the long term stress on electrodes. The corresponding HER activity is extremely stable for >40 h in an alkaline medium at an overpotential of 138 mV with a Tafel slope of 50 mV dec-1. Such properties offer a superior combination compared to those of other reported molybdenum based nanostructures, hence providing a great opportunity for developing high-performance alkaline non-metal HER catalysts.

Original languageEnglish
Pages (from-to)257-268
Number of pages12
JournalJournal of Materials Chemistry A
Volume7
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019

Cite this

Haque, Farjana ; Zavabeti, Ali ; Zhang, Bao Yue ; Datta, Robi S. ; Yin, Yuefeng ; Yi, Zhifeng ; Wang, Yichao ; Mahmood, Nasir ; Pillai, Naresh ; Syed, Nitu ; Khan, Hareem ; Jannat, Azmira ; Wang, Ning ; Medhekar, Nikhil ; Kalantar-Zadeh, Kourosh ; Ou, Jian Zhen. / Ordered intracrystalline pores in planar molybdenum oxide for enhanced alkaline hydrogen evolution. In: Journal of Materials Chemistry A. 2019 ; Vol. 7, No. 1. pp. 257-268.
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title = "Ordered intracrystalline pores in planar molybdenum oxide for enhanced alkaline hydrogen evolution",
abstract = "Molybdenum based compounds are an emerging class of non-metallic catalytic materials for the hydrogen evolution reaction (HER) in acidic media. However, most of them lose considerable catalytic performance and exhibit poor long-term stability in alkaline media. Here, planar molybdenum oxide, with high alkaline stability and ordered intracrystalline pores, is developed as the HER candidate. The pores with diameters in the order of ∼5-7 {\AA} are HER-active, and appear after an NH4 + doping-driven phase transition from the orthorhombic to hexagonal phase. Such a unique structure facilitates the diffusion of ionic entities and water molecules to the HER sites and helps in the removal of gaseous products, therefore improving the surface active area and reaction kinetics. These intracrystalline pores also reduce the long term stress on electrodes. The corresponding HER activity is extremely stable for >40 h in an alkaline medium at an overpotential of 138 mV with a Tafel slope of 50 mV dec-1. Such properties offer a superior combination compared to those of other reported molybdenum based nanostructures, hence providing a great opportunity for developing high-performance alkaline non-metal HER catalysts.",
author = "Farjana Haque and Ali Zavabeti and Zhang, {Bao Yue} and Datta, {Robi S.} and Yuefeng Yin and Zhifeng Yi and Yichao Wang and Nasir Mahmood and Naresh Pillai and Nitu Syed and Hareem Khan and Azmira Jannat and Ning Wang and Nikhil Medhekar and Kourosh Kalantar-Zadeh and Ou, {Jian Zhen}",
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month = "1",
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doi = "10.1039/c8ta08330d",
language = "English",
volume = "7",
pages = "257--268",
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Haque, F, Zavabeti, A, Zhang, BY, Datta, RS, Yin, Y, Yi, Z, Wang, Y, Mahmood, N, Pillai, N, Syed, N, Khan, H, Jannat, A, Wang, N, Medhekar, N, Kalantar-Zadeh, K & Ou, JZ 2019, 'Ordered intracrystalline pores in planar molybdenum oxide for enhanced alkaline hydrogen evolution' Journal of Materials Chemistry A, vol. 7, no. 1, pp. 257-268. https://doi.org/10.1039/c8ta08330d

Ordered intracrystalline pores in planar molybdenum oxide for enhanced alkaline hydrogen evolution. / Haque, Farjana; Zavabeti, Ali; Zhang, Bao Yue; Datta, Robi S.; Yin, Yuefeng; Yi, Zhifeng; Wang, Yichao; Mahmood, Nasir; Pillai, Naresh; Syed, Nitu; Khan, Hareem; Jannat, Azmira; Wang, Ning; Medhekar, Nikhil; Kalantar-Zadeh, Kourosh; Ou, Jian Zhen.

In: Journal of Materials Chemistry A, Vol. 7, No. 1, 01.01.2019, p. 257-268.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Ordered intracrystalline pores in planar molybdenum oxide for enhanced alkaline hydrogen evolution

AU - Haque, Farjana

AU - Zavabeti, Ali

AU - Zhang, Bao Yue

AU - Datta, Robi S.

AU - Yin, Yuefeng

AU - Yi, Zhifeng

AU - Wang, Yichao

AU - Mahmood, Nasir

AU - Pillai, Naresh

AU - Syed, Nitu

AU - Khan, Hareem

AU - Jannat, Azmira

AU - Wang, Ning

AU - Medhekar, Nikhil

AU - Kalantar-Zadeh, Kourosh

AU - Ou, Jian Zhen

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Molybdenum based compounds are an emerging class of non-metallic catalytic materials for the hydrogen evolution reaction (HER) in acidic media. However, most of them lose considerable catalytic performance and exhibit poor long-term stability in alkaline media. Here, planar molybdenum oxide, with high alkaline stability and ordered intracrystalline pores, is developed as the HER candidate. The pores with diameters in the order of ∼5-7 Å are HER-active, and appear after an NH4 + doping-driven phase transition from the orthorhombic to hexagonal phase. Such a unique structure facilitates the diffusion of ionic entities and water molecules to the HER sites and helps in the removal of gaseous products, therefore improving the surface active area and reaction kinetics. These intracrystalline pores also reduce the long term stress on electrodes. The corresponding HER activity is extremely stable for >40 h in an alkaline medium at an overpotential of 138 mV with a Tafel slope of 50 mV dec-1. Such properties offer a superior combination compared to those of other reported molybdenum based nanostructures, hence providing a great opportunity for developing high-performance alkaline non-metal HER catalysts.

AB - Molybdenum based compounds are an emerging class of non-metallic catalytic materials for the hydrogen evolution reaction (HER) in acidic media. However, most of them lose considerable catalytic performance and exhibit poor long-term stability in alkaline media. Here, planar molybdenum oxide, with high alkaline stability and ordered intracrystalline pores, is developed as the HER candidate. The pores with diameters in the order of ∼5-7 Å are HER-active, and appear after an NH4 + doping-driven phase transition from the orthorhombic to hexagonal phase. Such a unique structure facilitates the diffusion of ionic entities and water molecules to the HER sites and helps in the removal of gaseous products, therefore improving the surface active area and reaction kinetics. These intracrystalline pores also reduce the long term stress on electrodes. The corresponding HER activity is extremely stable for >40 h in an alkaline medium at an overpotential of 138 mV with a Tafel slope of 50 mV dec-1. Such properties offer a superior combination compared to those of other reported molybdenum based nanostructures, hence providing a great opportunity for developing high-performance alkaline non-metal HER catalysts.

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U2 - 10.1039/c8ta08330d

DO - 10.1039/c8ta08330d

M3 - Article

VL - 7

SP - 257

EP - 268

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

SN - 2050-7488

IS - 1

ER -