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Joo, Sang Hoon
Nanomaterials & Catalysis Lab
Research Interests
  • Catalyst, energy conversion, fuel cells, electrolyzer, ORR, HER, OER

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Direct conversion of coordination compounds into Ni2P nanoparticles entrapped in 3D mesoporous graphene for an efficient hydrogen evolution reaction

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dc.contributor.author Jeong, Sungeun ko
dc.contributor.author Seo, Bora ko
dc.contributor.author Hwang, Jeong Min ko
dc.contributor.author Joo, Sang Hoon ko
dc.contributor.author Moon, Hoi Ri ko
dc.date.available 2017-01-04T07:20:24Z -
dc.date.created 2017-01-04 ko
dc.date.issued 2017-05 ko
dc.identifier.citation MATERIALS CHEMISTRY FRONTIERS, v.1, no.5, pp.973 - 978 ko
dc.identifier.issn 2052-1537 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/21096 -
dc.description.abstract This paper reports a simple preparation route to a composite of small Ni2P nanoparticles (NPs) entrapped in 3D mesoporous graphene by the thermal conversion of a coordination compound followed by phosphidation. Recently, transition metal phosphides (TMPs) have gained increasing attention owing to their promising potential as non-precious metal catalysts in the hydrogen evolution reaction (HER). In order to enhance the catalytic activity of TMPs, researchers have sought to synthesize small TMP NPs to increase the catalytically active surface area. Although surfactant-mediated syntheses can produce small TMP NPs, a cumbersome surfactant removal step is necessary to generate catalytically active clean surfaces. Interfacing TMP NPs with carbon nanomaterials is another promising approach to boost the catalytic performance by providing high electrical conductivity and durability. However, the synthesis of composites of TMP NPs and carbon demands multiple synthetic steps, including the preparation of TMP NPs, synthesis of carbon nanomaterials, and dispersion of TMP NPs onto the carbon support. The essence of our approach toward the 3D graphene encapsulating Ni2P NPs (Ni2P@mesoG) lies in the utilization of the conversion phenomenon of [Ni2(EDTA)] (EDTA = ethylenediaminetetraacetate). The thermolysis of [Ni2(EDTA)] at 600 °C produces a composite of single-crystalline 5 nm-sized Ni NPs individually entrapped in 3D mesoG (Ni@mesoG), and the following phosphidation completely converts the Ni NPs to single-crystalline Ni2P NPs in mesoG (Ni2P@mesoG) without agglomeration. This solvent-free thermal conversion route to the Ni2P@mesoG composite is simple and scalable. Notably, graphitic shell layers in Ni2P@mesoG stabilize small Ni2P NPs possessing a large active surface area, and facilitate the electron transfer due to the intimate contact between them. Consequently, the use of Ni2P@mosoG exhibits superior electrocatalytic HER activity and durability in both strong acidic and basic media. ko
dc.description.statementofresponsibility close -
dc.language 영어 ko
dc.publisher ROYAL SOCIETY OF CHEMISTRY ko
dc.title Direct conversion of coordination compounds into Ni2P nanoparticles entrapped in 3D mesoporous graphene for an efficient hydrogen evolution reaction ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85033597740 ko
dc.identifier.wosid 000412448600024 ko
dc.type.rims ART ko
dc.identifier.doi 10.1039/C6QM00269B ko
dc.identifier.url http://pubs.rsc.org/en/content/articlelanding/2017/qm/c6qm00269b#!divAbstract ko
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