CdS-loaded flexible carbon nanofiber mats as a platform for solar hydrogen production

Young Kwang Kim; Minsun Kim; Sung Ho Hwang; Sang Kyoo Lim; Hyunwoong Park; Soonhyun Kim

doi:10.1016/j.ijhydene.2014.11.011

CdS-loaded flexible carbon nanofiber mats as a platform for solar hydrogen production

Young Kwang Kim, Minsun Kim, Sung Ho Hwang, Sang Kyoo Lim, Hyunwoong Park, Soonhyun Kim

School of Energy Engineering

Daegu Gyeongbuk Institute of Science and Technology

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

25 Scopus citations

Abstract

Photocatalysis-based solar hydrogen (H₂) has garnered attention as a renewable energy carrier, yet the technology is still immature. For practical operation of photocatalytic H₂ production, we fabricated a novel heterojunction of CdS-loaded flexible carbon nanofiber (CNF) mats. CNF mats were prepared by electrospinning and carbonization. CdS nanoparticles were deposited in alcohol and water solutions by the successive ionic layer adsorption and reaction (SILAR) method. The former solution was found to be more effective in uniformly dispersing CdS particles in the CNF mats. When pristine CNF mats were treated with acid (hereafter CdS/a-CNF), the degree of CdS particle distribution was further enhanced. Moreover, H₂ production was improved by a factor of 3 in an aqueous solution of Na₂S (0.1 M) and Na₂SO₃ (0.1 M) under visible light (λ > 420 nm). Heat-treatment of CdS/a-CNF mats at 400 °C dramatically increased H₂ production by 3.6 times due to the improved crystallinity of the CdS particles. In this heterojunction, the CNF mats have three roles: They work as a multi-scalable support for CdS particles, enhance photogenerated charge transfers, and catalyze H₂ evolution.

Original language	English
Pages (from-to)	136-145
Number of pages	10
Journal	International Journal of Hydrogen Energy
Volume	40
Issue number	1
DOIs	https://doi.org/10.1016/j.ijhydene.2014.11.011
State	Published - 5 Jan 2015

Keywords

Carbon materials
Heterojunction
Nanocomposites
Photocatalysts
Solar fuels

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.ijhydene.2014.11.011

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title = "CdS-loaded flexible carbon nanofiber mats as a platform for solar hydrogen production",

abstract = "Photocatalysis-based solar hydrogen (H2) has garnered attention as a renewable energy carrier, yet the technology is still immature. For practical operation of photocatalytic H2 production, we fabricated a novel heterojunction of CdS-loaded flexible carbon nanofiber (CNF) mats. CNF mats were prepared by electrospinning and carbonization. CdS nanoparticles were deposited in alcohol and water solutions by the successive ionic layer adsorption and reaction (SILAR) method. The former solution was found to be more effective in uniformly dispersing CdS particles in the CNF mats. When pristine CNF mats were treated with acid (hereafter CdS/a-CNF), the degree of CdS particle distribution was further enhanced. Moreover, H2 production was improved by a factor of 3 in an aqueous solution of Na2S (0.1 M) and Na2SO3 (0.1 M) under visible light (λ > 420 nm). Heat-treatment of CdS/a-CNF mats at 400 °C dramatically increased H2 production by 3.6 times due to the improved crystallinity of the CdS particles. In this heterojunction, the CNF mats have three roles: They work as a multi-scalable support for CdS particles, enhance photogenerated charge transfers, and catalyze H2 evolution.",

keywords = "Carbon materials, Heterojunction, Nanocomposites, Photocatalysts, Solar fuels",

author = "Kim, {Young Kwang} and Minsun Kim and Hwang, {Sung Ho} and Lim, {Sang Kyoo} and Hyunwoong Park and Soonhyun Kim",

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AU - Kim, Young Kwang

AU - Kim, Minsun

AU - Hwang, Sung Ho

AU - Lim, Sang Kyoo

AU - Park, Hyunwoong

AU - Kim, Soonhyun

PY - 2015/1/5

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N2 - Photocatalysis-based solar hydrogen (H2) has garnered attention as a renewable energy carrier, yet the technology is still immature. For practical operation of photocatalytic H2 production, we fabricated a novel heterojunction of CdS-loaded flexible carbon nanofiber (CNF) mats. CNF mats were prepared by electrospinning and carbonization. CdS nanoparticles were deposited in alcohol and water solutions by the successive ionic layer adsorption and reaction (SILAR) method. The former solution was found to be more effective in uniformly dispersing CdS particles in the CNF mats. When pristine CNF mats were treated with acid (hereafter CdS/a-CNF), the degree of CdS particle distribution was further enhanced. Moreover, H2 production was improved by a factor of 3 in an aqueous solution of Na2S (0.1 M) and Na2SO3 (0.1 M) under visible light (λ > 420 nm). Heat-treatment of CdS/a-CNF mats at 400 °C dramatically increased H2 production by 3.6 times due to the improved crystallinity of the CdS particles. In this heterojunction, the CNF mats have three roles: They work as a multi-scalable support for CdS particles, enhance photogenerated charge transfers, and catalyze H2 evolution.

AB - Photocatalysis-based solar hydrogen (H2) has garnered attention as a renewable energy carrier, yet the technology is still immature. For practical operation of photocatalytic H2 production, we fabricated a novel heterojunction of CdS-loaded flexible carbon nanofiber (CNF) mats. CNF mats were prepared by electrospinning and carbonization. CdS nanoparticles were deposited in alcohol and water solutions by the successive ionic layer adsorption and reaction (SILAR) method. The former solution was found to be more effective in uniformly dispersing CdS particles in the CNF mats. When pristine CNF mats were treated with acid (hereafter CdS/a-CNF), the degree of CdS particle distribution was further enhanced. Moreover, H2 production was improved by a factor of 3 in an aqueous solution of Na2S (0.1 M) and Na2SO3 (0.1 M) under visible light (λ > 420 nm). Heat-treatment of CdS/a-CNF mats at 400 °C dramatically increased H2 production by 3.6 times due to the improved crystallinity of the CdS particles. In this heterojunction, the CNF mats have three roles: They work as a multi-scalable support for CdS particles, enhance photogenerated charge transfers, and catalyze H2 evolution.

KW - Carbon materials

KW - Heterojunction

KW - Nanocomposites

KW - Photocatalysts

KW - Solar fuels

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CdS-loaded flexible carbon nanofiber mats as a platform for solar hydrogen production

Abstract

Keywords

UN SDGs

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