Rague-Like FeP Nanocrystal Assembly on Carbon Cloth: An Exceptionally Efficient and Stable Cathode for Hydrogen Evolution

Handle URI:
http://hdl.handle.net/10754/556098
Title:
Rague-Like FeP Nanocrystal Assembly on Carbon Cloth: An Exceptionally Efficient and Stable Cathode for Hydrogen Evolution
Authors:
Yang, Xiulin ( 0000-0003-2642-4963 ) ; Lu, Ang-Yu; Zhu, Yihan; Min, Shixiong ( 0000-0001-6248-8804 ) ; Hedhili, Mohamed N. ( 0000-0002-3624-036X ) ; Han, Yu ( 0000-0003-1462-1118 ) ; Huang, Kuo-Wei ( 0000-0003-1900-2658 ) ; Li, Lain-Jong ( 0000-0002-4059-7783 )
Abstract:
There is a strong demand to replace expensive Pt catalysts with cheap metal sulfides or phosphides for hydrogen generation in water electrolysis. The earth-abundant Fe can be electroplated on carbon cloth (CC) to form high surface area rague-like FeOOH assembly. Subsequent gas phase phosphidation converts the FeOOH to FeP or FeP2 and the morphology of the crystal assembly is controlled by the phosphidation temperature. The FeP prepared at 250 oC presents lower crystallinity and those prepared at higher temperatures 400 oC and 500 oC possess higher crystallinity but lower surface area. The phosphidation at 300 oC produces nanocrystalline FeP and preserves the high-surface area morphology; thus it exhibits the highest HER efficiency in 0.5 M H2SO4; i.e. the required overpotential to reach 10 and 20 mA/cm2 is 34 and 43 mV respectively. These values are lowest among the reported non-precious metal phosphides on CC. The Tafel slope for the FeP prepared at 300 oC is around 29.2 mV/dec comparable to that of Pt/CC, indicating that the hydrogen evolution for our best FeP is limited by Tafel reaction (same as Pt). Importantly, the FeP/CC catalyst exhibits much better stability in a wide range working current density (up to 1 V/cm2), suggesting that it is a promising replacement of Pt for HER.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Rague-Like FeP Nanocrystal Assembly on Carbon Cloth: An Exceptionally Efficient and Stable Cathode for Hydrogen Evolution 2015 Nanoscale
Publisher:
Royal Society of Chemistry (RSC)
Journal:
Nanoscale
Issue Date:
25-May-2015
DOI:
10.1039/C5NR02375K
Type:
Article
ISSN:
2040-3364; 2040-3372
Additional Links:
http://pubs.rsc.org/en/Content/ArticleLanding/2015/NR/C5NR02375K
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorYang, Xiulinen
dc.contributor.authorLu, Ang-Yuen
dc.contributor.authorZhu, Yihanen
dc.contributor.authorMin, Shixiongen
dc.contributor.authorHedhili, Mohamed N.en
dc.contributor.authorHan, Yuen
dc.contributor.authorHuang, Kuo-Weien
dc.contributor.authorLi, Lain-Jongen
dc.date.accessioned2015-05-31T08:54:11Zen
dc.date.available2015-05-31T08:54:11Zen
dc.date.issued2015-05-25en
dc.identifier.citationRague-Like FeP Nanocrystal Assembly on Carbon Cloth: An Exceptionally Efficient and Stable Cathode for Hydrogen Evolution 2015 Nanoscaleen
dc.identifier.issn2040-3364en
dc.identifier.issn2040-3372en
dc.identifier.doi10.1039/C5NR02375Ken
dc.identifier.urihttp://hdl.handle.net/10754/556098en
dc.description.abstractThere is a strong demand to replace expensive Pt catalysts with cheap metal sulfides or phosphides for hydrogen generation in water electrolysis. The earth-abundant Fe can be electroplated on carbon cloth (CC) to form high surface area rague-like FeOOH assembly. Subsequent gas phase phosphidation converts the FeOOH to FeP or FeP2 and the morphology of the crystal assembly is controlled by the phosphidation temperature. The FeP prepared at 250 oC presents lower crystallinity and those prepared at higher temperatures 400 oC and 500 oC possess higher crystallinity but lower surface area. The phosphidation at 300 oC produces nanocrystalline FeP and preserves the high-surface area morphology; thus it exhibits the highest HER efficiency in 0.5 M H2SO4; i.e. the required overpotential to reach 10 and 20 mA/cm2 is 34 and 43 mV respectively. These values are lowest among the reported non-precious metal phosphides on CC. The Tafel slope for the FeP prepared at 300 oC is around 29.2 mV/dec comparable to that of Pt/CC, indicating that the hydrogen evolution for our best FeP is limited by Tafel reaction (same as Pt). Importantly, the FeP/CC catalyst exhibits much better stability in a wide range working current density (up to 1 V/cm2), suggesting that it is a promising replacement of Pt for HER.en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.relation.urlhttp://pubs.rsc.org/en/Content/ArticleLanding/2015/NR/C5NR02375Ken
dc.rightsArchived with thanks to Nanoscaleen
dc.titleRague-Like FeP Nanocrystal Assembly on Carbon Cloth: An Exceptionally Efficient and Stable Cathode for Hydrogen Evolutionen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalNanoscaleen
dc.eprint.versionPost-printen
kaust.authorYang, Xiulinen
kaust.authorZhu, Yihanen
kaust.authorHedhili, Mohamed N.en
kaust.authorHan, Yuen
kaust.authorHuang, Kuo-Weien
kaust.authorLi, Lain-Jongen
kaust.authorLu, Ang-Yuen
kaust.authorMin, Shixiongen
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