Multidirectional-charge-transfer urchin-type Mo-doped W18O49 nanostructures on CdS nanorods for enhanced photocatalytic hydrogen evolution

P. Bhavani, D. Praveen Kumar, Seonghyun Jeong, Eun Hwa Kim, Hanbit Park, Sangyeob Hong, Madhusudana Gopannagari, D. Amaranatha Reddy, Jae Kyu Song, Tae Kyu Kim

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Transition metal oxides (TMOs) have attracted attention because they provide eco-friendly ways of collecting solar energy and are more stable than sulfides or phosphides for photoirradiation over long periods without photocorrosion. Among TMOs, tungsten oxides have attracted considerable attention owing to their excellent electron transport properties and good resilience to photocorrosion in aqueous media. However, pristine WO3 exhibits low photocatalytic activity because of the rapid recombination of its photogenerated charge-carriers and its narrow photo-absorption range. Consequently, the monoclinic oxygen-deficient (WO3-δ) material W18O49 (≅WO2.73) has attracted greater interest than typical tungsten oxides due to its high chemical stability and large number of oxygen vacancies (OVs). In particular, the water splitting efficiency of W18O49 is enhanced by doping with Mo, which modifies the intrinsic chemical properties of W18O49 without disturbing the crystal structure while producing more active sites. Furthermore, by tuning the morphology of Mo-W18O49 (MWO), the photocatalytic activity of MWO-embedded CdS was greatly enhanced by the very large surface area and supplementary active sites. To that end, we developed an urchin-type MWO cocatalyst integrated into CdS nanorods (NRs) by simple methods. The catalyst exhibits an enhanced production rate of H2 (40.225 mmol h-1 g-1) under simulated solar light irradiation, which is 20 times higher than that of pristine CdS NRs. The urchin-type morphology significantly shortens charge-carrier transport distances. The oxygen deficiency and Mo dopant in the W18O49 system also improve the number of active sites, which promotes the efficient utilization of light, excellent electron-transport properties, and good resilience to photocorrosion. These properties are especially beneficial for the effective excitation and separation of charge-carriers that are directed to the reduction of protons to H2. Moreover, to the best of our knowledge, this material exhibits the best performance among reported tungsten-based oxides as a cocatalyst on CdS composites.

Original languageEnglish
Pages (from-to)1880-1891
Number of pages12
JournalCatalysis Science and Technology
Volume8
Issue number7
DOIs
Publication statusPublished - 2018 Apr 7

Fingerprint

Charge carriers
Nanorods
Electron transport properties
Charge transfer
Hydrogen
Nanostructures
Oxides
Transition metals
Tungsten
Doping (additives)
Oxygen
Carrier transport
Chemical stability
Sulfides
Oxygen vacancies
Solar energy
Chemical properties
Protons
Tuning
Crystal structure

All Science Journal Classification (ASJC) codes

  • Catalysis

Cite this

Bhavani, P. ; Praveen Kumar, D. ; Jeong, Seonghyun ; Kim, Eun Hwa ; Park, Hanbit ; Hong, Sangyeob ; Gopannagari, Madhusudana ; Amaranatha Reddy, D. ; Song, Jae Kyu ; Kim, Tae Kyu. / Multidirectional-charge-transfer urchin-type Mo-doped W18O49 nanostructures on CdS nanorods for enhanced photocatalytic hydrogen evolution. In: Catalysis Science and Technology. 2018 ; Vol. 8, No. 7. pp. 1880-1891.
@article{5c1c22bacd6745c4ae5ce0f60761f910,
title = "Multidirectional-charge-transfer urchin-type Mo-doped W18O49 nanostructures on CdS nanorods for enhanced photocatalytic hydrogen evolution",
abstract = "Transition metal oxides (TMOs) have attracted attention because they provide eco-friendly ways of collecting solar energy and are more stable than sulfides or phosphides for photoirradiation over long periods without photocorrosion. Among TMOs, tungsten oxides have attracted considerable attention owing to their excellent electron transport properties and good resilience to photocorrosion in aqueous media. However, pristine WO3 exhibits low photocatalytic activity because of the rapid recombination of its photogenerated charge-carriers and its narrow photo-absorption range. Consequently, the monoclinic oxygen-deficient (WO3-δ) material W18O49 (≅WO2.73) has attracted greater interest than typical tungsten oxides due to its high chemical stability and large number of oxygen vacancies (OVs). In particular, the water splitting efficiency of W18O49 is enhanced by doping with Mo, which modifies the intrinsic chemical properties of W18O49 without disturbing the crystal structure while producing more active sites. Furthermore, by tuning the morphology of Mo-W18O49 (MWO), the photocatalytic activity of MWO-embedded CdS was greatly enhanced by the very large surface area and supplementary active sites. To that end, we developed an urchin-type MWO cocatalyst integrated into CdS nanorods (NRs) by simple methods. The catalyst exhibits an enhanced production rate of H2 (40.225 mmol h-1 g-1) under simulated solar light irradiation, which is 20 times higher than that of pristine CdS NRs. The urchin-type morphology significantly shortens charge-carrier transport distances. The oxygen deficiency and Mo dopant in the W18O49 system also improve the number of active sites, which promotes the efficient utilization of light, excellent electron-transport properties, and good resilience to photocorrosion. These properties are especially beneficial for the effective excitation and separation of charge-carriers that are directed to the reduction of protons to H2. Moreover, to the best of our knowledge, this material exhibits the best performance among reported tungsten-based oxides as a cocatalyst on CdS composites.",
author = "P. Bhavani and {Praveen Kumar}, D. and Seonghyun Jeong and Kim, {Eun Hwa} and Hanbit Park and Sangyeob Hong and Madhusudana Gopannagari and {Amaranatha Reddy}, D. and Song, {Jae Kyu} and Kim, {Tae Kyu}",
year = "2018",
month = "4",
day = "7",
doi = "10.1039/c7cy02162c",
language = "English",
volume = "8",
pages = "1880--1891",
journal = "Catalysis Science and Technology",
issn = "2044-4753",
publisher = "Royal Society of Chemistry",
number = "7",

}

Bhavani, P, Praveen Kumar, D, Jeong, S, Kim, EH, Park, H, Hong, S, Gopannagari, M, Amaranatha Reddy, D, Song, JK & Kim, TK 2018, 'Multidirectional-charge-transfer urchin-type Mo-doped W18O49 nanostructures on CdS nanorods for enhanced photocatalytic hydrogen evolution', Catalysis Science and Technology, vol. 8, no. 7, pp. 1880-1891. https://doi.org/10.1039/c7cy02162c

Multidirectional-charge-transfer urchin-type Mo-doped W18O49 nanostructures on CdS nanorods for enhanced photocatalytic hydrogen evolution. / Bhavani, P.; Praveen Kumar, D.; Jeong, Seonghyun; Kim, Eun Hwa; Park, Hanbit; Hong, Sangyeob; Gopannagari, Madhusudana; Amaranatha Reddy, D.; Song, Jae Kyu; Kim, Tae Kyu.

In: Catalysis Science and Technology, Vol. 8, No. 7, 07.04.2018, p. 1880-1891.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Multidirectional-charge-transfer urchin-type Mo-doped W18O49 nanostructures on CdS nanorods for enhanced photocatalytic hydrogen evolution

AU - Bhavani, P.

AU - Praveen Kumar, D.

AU - Jeong, Seonghyun

AU - Kim, Eun Hwa

AU - Park, Hanbit

AU - Hong, Sangyeob

AU - Gopannagari, Madhusudana

AU - Amaranatha Reddy, D.

AU - Song, Jae Kyu

AU - Kim, Tae Kyu

PY - 2018/4/7

Y1 - 2018/4/7

N2 - Transition metal oxides (TMOs) have attracted attention because they provide eco-friendly ways of collecting solar energy and are more stable than sulfides or phosphides for photoirradiation over long periods without photocorrosion. Among TMOs, tungsten oxides have attracted considerable attention owing to their excellent electron transport properties and good resilience to photocorrosion in aqueous media. However, pristine WO3 exhibits low photocatalytic activity because of the rapid recombination of its photogenerated charge-carriers and its narrow photo-absorption range. Consequently, the monoclinic oxygen-deficient (WO3-δ) material W18O49 (≅WO2.73) has attracted greater interest than typical tungsten oxides due to its high chemical stability and large number of oxygen vacancies (OVs). In particular, the water splitting efficiency of W18O49 is enhanced by doping with Mo, which modifies the intrinsic chemical properties of W18O49 without disturbing the crystal structure while producing more active sites. Furthermore, by tuning the morphology of Mo-W18O49 (MWO), the photocatalytic activity of MWO-embedded CdS was greatly enhanced by the very large surface area and supplementary active sites. To that end, we developed an urchin-type MWO cocatalyst integrated into CdS nanorods (NRs) by simple methods. The catalyst exhibits an enhanced production rate of H2 (40.225 mmol h-1 g-1) under simulated solar light irradiation, which is 20 times higher than that of pristine CdS NRs. The urchin-type morphology significantly shortens charge-carrier transport distances. The oxygen deficiency and Mo dopant in the W18O49 system also improve the number of active sites, which promotes the efficient utilization of light, excellent electron-transport properties, and good resilience to photocorrosion. These properties are especially beneficial for the effective excitation and separation of charge-carriers that are directed to the reduction of protons to H2. Moreover, to the best of our knowledge, this material exhibits the best performance among reported tungsten-based oxides as a cocatalyst on CdS composites.

AB - Transition metal oxides (TMOs) have attracted attention because they provide eco-friendly ways of collecting solar energy and are more stable than sulfides or phosphides for photoirradiation over long periods without photocorrosion. Among TMOs, tungsten oxides have attracted considerable attention owing to their excellent electron transport properties and good resilience to photocorrosion in aqueous media. However, pristine WO3 exhibits low photocatalytic activity because of the rapid recombination of its photogenerated charge-carriers and its narrow photo-absorption range. Consequently, the monoclinic oxygen-deficient (WO3-δ) material W18O49 (≅WO2.73) has attracted greater interest than typical tungsten oxides due to its high chemical stability and large number of oxygen vacancies (OVs). In particular, the water splitting efficiency of W18O49 is enhanced by doping with Mo, which modifies the intrinsic chemical properties of W18O49 without disturbing the crystal structure while producing more active sites. Furthermore, by tuning the morphology of Mo-W18O49 (MWO), the photocatalytic activity of MWO-embedded CdS was greatly enhanced by the very large surface area and supplementary active sites. To that end, we developed an urchin-type MWO cocatalyst integrated into CdS nanorods (NRs) by simple methods. The catalyst exhibits an enhanced production rate of H2 (40.225 mmol h-1 g-1) under simulated solar light irradiation, which is 20 times higher than that of pristine CdS NRs. The urchin-type morphology significantly shortens charge-carrier transport distances. The oxygen deficiency and Mo dopant in the W18O49 system also improve the number of active sites, which promotes the efficient utilization of light, excellent electron-transport properties, and good resilience to photocorrosion. These properties are especially beneficial for the effective excitation and separation of charge-carriers that are directed to the reduction of protons to H2. Moreover, to the best of our knowledge, this material exhibits the best performance among reported tungsten-based oxides as a cocatalyst on CdS composites.

UR - http://www.scopus.com/inward/record.url?scp=85045089344&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85045089344&partnerID=8YFLogxK

U2 - 10.1039/c7cy02162c

DO - 10.1039/c7cy02162c

M3 - Article

AN - SCOPUS:85045089344

VL - 8

SP - 1880

EP - 1891

JO - Catalysis Science and Technology

JF - Catalysis Science and Technology

SN - 2044-4753

IS - 7

ER -