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

Haque, F, Zavabeti, S, Zhang, B, Datta, R, Yin, Y, Yi, Z, Wang, Y, Mahmood, N, Pillai, N, Syed, N, Khan, H, Jannat, A, Wang, N, Medhekar, N, Kalantar Zadeh, K and Ou, J 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.

Document type: Journal Article
Collection: Journal Articles

Title Ordered intracrystalline pores in planar molybdenum oxide for enhanced alkaline hydrogen evolution
Author(s) Haque, F
Zavabeti, S
Zhang, B
Datta, R
Yin, Y
Yi, Z
Wang, Y
Mahmood, N
Pillai, N
Syed, N
Khan, H
Jannat, A
Wang, N
Medhekar, N
Kalantar Zadeh, K
Ou, J
Year 2019
Journal name Journal of Materials Chemistry A
Volume number 7
Issue number 1
Start page 257
End page 268
Total pages 12
Publisher Royal Society of Chemistry
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 approximate to 5-7 angstrom 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.
Subject Functional Materials
Keyword(s) highly efficient electrocatalyst
noble-metal electrocatalyst
stable electrocatalyst
graphene nanosheets
hexagonal MOO3
nanocrystalline CO0.85SE
generating hydrogen
scalable synthesis
DOI - identifier 10.1039/c8ta08330d
Copyright notice This journal is © The Royal Society of Chemistry 2019
ISSN 2050-7488
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