Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 15, Pages 5285-5288Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b00165
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Funding
- 973 Project [2014CB845602]
- NSFC [21225105, 21290173, 21473260, 21521091, 21131004, 21390393, U1463202]
- National Postdoctoral Program for Innovative Talents [BX201600195]
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The size-controlled synthesis of ultrasmall metal-based catalysts is of vital importance for chemical conversion technologies. Here, a cage-confinement pyrolysis strategy is presented for the synthesis of ultrasmall tungsten carbide nanoclusters/nanoparticles. An RHO type zeolitic metal azolate framework MAF-6, possessing large nanocages and small apertures, is selected to confine the metal source W(CO)(6). High temperature pyrolysis gives tungsten carbide nanodusters/nanopartides with sizes ca. 2 nm, which can serve as an excellent electrocatalyst for the hydrogen evolution reaction. In 0.5 M H2SO4, it exhibits very low overpotential of 51 mV at 10 mA cm(-2) and Tafel slope of 49 mV per decade, as well as the highest exchange current density of 2.4 mA cm(-2) among all tungsten/molybdenum-based catalysts. Moreover, it also shows excellent stability and antiaggregation behavior after long-term electrolytic process.
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