Sub-1.1 nm ultrathin porous CoP nanosheets with dominant reactive {200} facets: a high mass activity and efficient electrocatalyst for the hydrogen evolution reaction† †Electronic supplementary information (ESI) available: Fig. S1–S14 and Tables S1–S3. See DOI: 10.1039/c6sc05687c Click here for additional data file.
نویسندگان
چکیده
The exploration of a facile strategy to synthesize porous ultrathin nanosheets of non-layered materials, especially with exposed reactive facets, as highly efficient electrocatalysts for the hydrogen evolution reaction (HER), remains challenging. Herein we demonstrate a chemical transformation strategy to synthesize porous CoP ultrathin nanosheets with sub-1.1 nm thickness and exposed {200} facets via phosphidation of Co3O4 precursors. The resultant samples exhibit outstanding electrochemical HER performance: a low overpotential (only 56 and 131 mV are required for current densities of 10 and 100 mA cm , respectively), a small Tafel slope of 44 mV per decade, a good stability of over 20 h, and a high mass activity of 151 A g 1 at an overpotential of 100 mV. The latter is about 80 times higher than that of CoP nanoparticles. Experimental data and density functional theory calculations reveal that a high proportion of reactive {200} facets, high utilization efficiency of active sites, metallic nature, appropriate structural disorder, facile electron/mass transfer and rich active sites benefiting from the unique ultrathin and porous structure are the key factors for the greatly improved activity. Additionally, this facile chemical conversion strategy can be developed to a generalized method for preparing porous ultrathin nanosheets of CoSe2 and CoS that cannot be obtained using other methods.
منابع مشابه
Electrochemical maps and movies of the hydrogen evolution reaction on natural crystals of molybdenite (MoS2): basal vs. edge plane activity† †Electronic supplementary information (ESI) available: Movies S1 to S4: spatially resolved LSV-SECCM movies obtained from the electrocatalytic HER on the surface of bulk MoS2. Fig. S1 to S14: XRD, XPS, Raman, SEM and OM characterization of MoS2; SEM images of the nanopipets; WCA measurements; LSVs and Tafel plots obtained from the HER on MoS2. See DOI: 10.1039/c7sc02545a Click here for additional data file. Click here for additional data file. Click here for additional data file. Click here for additional data file. Click here for additional data file.
Department of Chemistry, University of Wa [email protected]; P.R.Unwin@warw School of Chemistry, Australian Resear Electromaterials Science, Monash University Department of Physics, University of Warwi † Electronic supplementary information ( resolved LSV-SECCM movies obtained f surface of bulk MoS2. Fig. S1 to S14 characterization of MoS2; SEM images of LSVs and Tafel plots obtained from...
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Key Laboratory of Optoelectronic Materials Research on the Structure of Matter, Chine 350002, China. E-mail: xchen@irsm.ac.cn State Key Laboratory of Structural Chemis and Cancer, Fujian Institute of Research Academy of Sciences, Fuzhou, Fujian 35000 University of Chinese Academy of Sciences, † Electronic supplementary information Fig. S1–S20 and Movie S1. See DOI: 10.10 Cite this: Chem. Sci.,...
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Department of Chemistry, Graduate Schoo Osaka 560-0043, Japan. E-mail: konno@che Department of Biomedical Information Sc Sciences, Hiroshima City University, Asa-Mi Department of Chemistry, Graduate Scho Bunkyo-ku, Tokyo 113-0033, Japan Division of Materials Physics, Graduate University, Toyonaka, Osaka 560-8531, Japa Synchrotron Radiation Center, Ritsumeika Japan Department of Material and Lif...
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عنوان ژورنال:
دوره 8 شماره
صفحات -
تاریخ انتشار 2017