Noble-Metal-Free Hybrid Membranes for Highly Efficient Hydrogen Evolution

Xuyang Wang, Xin Gan, Tao Hu, Kazunori Fujisawa, Yu Lei, Zhong Lin, Ben Xu, Zheng Hong Huang, Feiyu Kang, Mauricio Terrones Maldonado, Ruitao Lv

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

A novel nanostructured material composed of WS2/WO2.9/C membranes with free-standing and flexible feature, which were synthesized via a two-step heat treatment of ammonium tetrathiotungstate ((NH4)2WS4) and polyacrylonitrile (PAN) spin-coated onto graphite foils. These two precursors decompose at high temperature (850°C) forming WS2 and C species, while the introduction of trace amount of oxygen leads to the formation of WO2.9 nanowires. First, (NH4) 2WS4 and PAN were dissolved in N,N-dimethylformamide (DMF). The mixture was stirred until a homogeneous solution was formed. The precursor solution was then spin-coated onto a substrate. After drying under ambient conditions, the coated substrate was loaded into a chemical vapor deposition (CVD) system for thermal treatment in the presence of sulfur. The precursor on the substrate was first annealed at 500°C in Ar/H2 flow to decompose (NH4) 2WS4, and then heated up to 850°C and annealed under an Ar flow and vaporized sulfur, finally the system was allowed to cool down to room temperature. Trace amounts of oxygen were induced into the CVD system during the cooling process, thus leading to the formation of tungsten oxide at 700°C. As-synthesized WS2/WO2.9/C samples on graphite foils exhibit excellent mechanical flexibility. Scanning transmission electron microscopy (STEM) coupled with high-angle annular dark-field (HAADF) imaging, reveals the fine structure of the WS2/WO2.9/C sample. STEM-EDS mappings indicate that the distributions of S and O are correlated with W, while the density of C is rather low in W-rich regions, thus implying that tungsten sulfide and oxide are the main phases. In addition to elemental distribution, electron microscopy also reveals the crystalline structure of the WS2/WO2.9/C hybrid. High-resolution TEM (HRTEM) image demonstrates widely separated fringes with the closest spacing of 0.62 nm, which is in agreement with the d-spacing of of 2H-WS2.

Original languageEnglish (US)
Article number1603617
JournalAdvanced Materials
Volume29
Issue number4
DOIs
StatePublished - Jan 1 2017

Fingerprint

Precious metals
Hydrogen
Graphite
Polyacrylonitriles
Transmission electron microscopy
Membranes
Sulfur
Metal foil
Tungsten
Chemical vapor deposition
Substrates
Heat treatment
Oxygen
Dimethylformamide
Scanning electron microscopy
Oxides
Sulfides
Nanostructured materials
Electron microscopy
Nanowires

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Wang, Xuyang ; Gan, Xin ; Hu, Tao ; Fujisawa, Kazunori ; Lei, Yu ; Lin, Zhong ; Xu, Ben ; Huang, Zheng Hong ; Kang, Feiyu ; Terrones Maldonado, Mauricio ; Lv, Ruitao. / Noble-Metal-Free Hybrid Membranes for Highly Efficient Hydrogen Evolution. In: Advanced Materials. 2017 ; Vol. 29, No. 4.
@article{561062d3b9e24cfbade5add73a08f769,
title = "Noble-Metal-Free Hybrid Membranes for Highly Efficient Hydrogen Evolution",
abstract = "A novel nanostructured material composed of WS2/WO2.9/C membranes with free-standing and flexible feature, which were synthesized via a two-step heat treatment of ammonium tetrathiotungstate ((NH4)2WS4) and polyacrylonitrile (PAN) spin-coated onto graphite foils. These two precursors decompose at high temperature (850°C) forming WS2 and C species, while the introduction of trace amount of oxygen leads to the formation of WO2.9 nanowires. First, (NH4) 2WS4 and PAN were dissolved in N,N-dimethylformamide (DMF). The mixture was stirred until a homogeneous solution was formed. The precursor solution was then spin-coated onto a substrate. After drying under ambient conditions, the coated substrate was loaded into a chemical vapor deposition (CVD) system for thermal treatment in the presence of sulfur. The precursor on the substrate was first annealed at 500°C in Ar/H2 flow to decompose (NH4) 2WS4, and then heated up to 850°C and annealed under an Ar flow and vaporized sulfur, finally the system was allowed to cool down to room temperature. Trace amounts of oxygen were induced into the CVD system during the cooling process, thus leading to the formation of tungsten oxide at 700°C. As-synthesized WS2/WO2.9/C samples on graphite foils exhibit excellent mechanical flexibility. Scanning transmission electron microscopy (STEM) coupled with high-angle annular dark-field (HAADF) imaging, reveals the fine structure of the WS2/WO2.9/C sample. STEM-EDS mappings indicate that the distributions of S and O are correlated with W, while the density of C is rather low in W-rich regions, thus implying that tungsten sulfide and oxide are the main phases. In addition to elemental distribution, electron microscopy also reveals the crystalline structure of the WS2/WO2.9/C hybrid. High-resolution TEM (HRTEM) image demonstrates widely separated fringes with the closest spacing of 0.62 nm, which is in agreement with the d-spacing of of 2H-WS2.",
author = "Xuyang Wang and Xin Gan and Tao Hu and Kazunori Fujisawa and Yu Lei and Zhong Lin and Ben Xu and Huang, {Zheng Hong} and Feiyu Kang and {Terrones Maldonado}, Mauricio and Ruitao Lv",
year = "2017",
month = "1",
day = "1",
doi = "10.1002/adma.201603617",
language = "English (US)",
volume = "29",
journal = "Advanced Materials",
issn = "0935-9648",
publisher = "Wiley-VCH Verlag",
number = "4",

}

Wang, X, Gan, X, Hu, T, Fujisawa, K, Lei, Y, Lin, Z, Xu, B, Huang, ZH, Kang, F, Terrones Maldonado, M & Lv, R 2017, 'Noble-Metal-Free Hybrid Membranes for Highly Efficient Hydrogen Evolution', Advanced Materials, vol. 29, no. 4, 1603617. https://doi.org/10.1002/adma.201603617

Noble-Metal-Free Hybrid Membranes for Highly Efficient Hydrogen Evolution. / Wang, Xuyang; Gan, Xin; Hu, Tao; Fujisawa, Kazunori; Lei, Yu; Lin, Zhong; Xu, Ben; Huang, Zheng Hong; Kang, Feiyu; Terrones Maldonado, Mauricio; Lv, Ruitao.

In: Advanced Materials, Vol. 29, No. 4, 1603617, 01.01.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Noble-Metal-Free Hybrid Membranes for Highly Efficient Hydrogen Evolution

AU - Wang, Xuyang

AU - Gan, Xin

AU - Hu, Tao

AU - Fujisawa, Kazunori

AU - Lei, Yu

AU - Lin, Zhong

AU - Xu, Ben

AU - Huang, Zheng Hong

AU - Kang, Feiyu

AU - Terrones Maldonado, Mauricio

AU - Lv, Ruitao

PY - 2017/1/1

Y1 - 2017/1/1

N2 - A novel nanostructured material composed of WS2/WO2.9/C membranes with free-standing and flexible feature, which were synthesized via a two-step heat treatment of ammonium tetrathiotungstate ((NH4)2WS4) and polyacrylonitrile (PAN) spin-coated onto graphite foils. These two precursors decompose at high temperature (850°C) forming WS2 and C species, while the introduction of trace amount of oxygen leads to the formation of WO2.9 nanowires. First, (NH4) 2WS4 and PAN were dissolved in N,N-dimethylformamide (DMF). The mixture was stirred until a homogeneous solution was formed. The precursor solution was then spin-coated onto a substrate. After drying under ambient conditions, the coated substrate was loaded into a chemical vapor deposition (CVD) system for thermal treatment in the presence of sulfur. The precursor on the substrate was first annealed at 500°C in Ar/H2 flow to decompose (NH4) 2WS4, and then heated up to 850°C and annealed under an Ar flow and vaporized sulfur, finally the system was allowed to cool down to room temperature. Trace amounts of oxygen were induced into the CVD system during the cooling process, thus leading to the formation of tungsten oxide at 700°C. As-synthesized WS2/WO2.9/C samples on graphite foils exhibit excellent mechanical flexibility. Scanning transmission electron microscopy (STEM) coupled with high-angle annular dark-field (HAADF) imaging, reveals the fine structure of the WS2/WO2.9/C sample. STEM-EDS mappings indicate that the distributions of S and O are correlated with W, while the density of C is rather low in W-rich regions, thus implying that tungsten sulfide and oxide are the main phases. In addition to elemental distribution, electron microscopy also reveals the crystalline structure of the WS2/WO2.9/C hybrid. High-resolution TEM (HRTEM) image demonstrates widely separated fringes with the closest spacing of 0.62 nm, which is in agreement with the d-spacing of of 2H-WS2.

AB - A novel nanostructured material composed of WS2/WO2.9/C membranes with free-standing and flexible feature, which were synthesized via a two-step heat treatment of ammonium tetrathiotungstate ((NH4)2WS4) and polyacrylonitrile (PAN) spin-coated onto graphite foils. These two precursors decompose at high temperature (850°C) forming WS2 and C species, while the introduction of trace amount of oxygen leads to the formation of WO2.9 nanowires. First, (NH4) 2WS4 and PAN were dissolved in N,N-dimethylformamide (DMF). The mixture was stirred until a homogeneous solution was formed. The precursor solution was then spin-coated onto a substrate. After drying under ambient conditions, the coated substrate was loaded into a chemical vapor deposition (CVD) system for thermal treatment in the presence of sulfur. The precursor on the substrate was first annealed at 500°C in Ar/H2 flow to decompose (NH4) 2WS4, and then heated up to 850°C and annealed under an Ar flow and vaporized sulfur, finally the system was allowed to cool down to room temperature. Trace amounts of oxygen were induced into the CVD system during the cooling process, thus leading to the formation of tungsten oxide at 700°C. As-synthesized WS2/WO2.9/C samples on graphite foils exhibit excellent mechanical flexibility. Scanning transmission electron microscopy (STEM) coupled with high-angle annular dark-field (HAADF) imaging, reveals the fine structure of the WS2/WO2.9/C sample. STEM-EDS mappings indicate that the distributions of S and O are correlated with W, while the density of C is rather low in W-rich regions, thus implying that tungsten sulfide and oxide are the main phases. In addition to elemental distribution, electron microscopy also reveals the crystalline structure of the WS2/WO2.9/C hybrid. High-resolution TEM (HRTEM) image demonstrates widely separated fringes with the closest spacing of 0.62 nm, which is in agreement with the d-spacing of of 2H-WS2.

UR - http://www.scopus.com/inward/record.url?scp=85006117359&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85006117359&partnerID=8YFLogxK

U2 - 10.1002/adma.201603617

DO - 10.1002/adma.201603617

M3 - Article

VL - 29

JO - Advanced Materials

JF - Advanced Materials

SN - 0935-9648

IS - 4

M1 - 1603617

ER -