Electrochemical water splitting is an important strategy for the mass production of hydrogen. Development of synthesizable catalysts has always been one of the biggest obstacles to replace platinum‐group catalysts. In this work, a high quality crystal polymer covalent triazine framework [CTF; Brunauer–Emmett–Teller (BET) surface area of 1562.6 m2 g−1] is synthesized and MoS2 nanoparticles are grown in situ into/onto the 1 D channel arrays or the external surface for electrocatalysis [hydrogen evolution reaction (HER)] . The state‐of‐the‐art CTFs@MoS2 structure exhibits superior catalytic kinetics with an overpotential of 93 mV and Tafel slope of 43 mV dec−1, which is improved over most other reported analogous catalysts. The inherent π‐conjugated crystal channels in CTFs provides a multifunctional support for electron transmission and mass diffusion during the hydrogen evolution process. Catalytic kinetics analysis shows that the HER performance is closely correlated to the hierarchical pore parameters and aggregated thickness of MoS2 nanoparticles. This work provides an attractive and durable alternative to synthesize high activity and stable catalysts for HER.
Liquid−liquid interfacial tension of four 1-alkyl-3-methylimidazolium ([Cn-mim], n = 5, 6, 7, 8) based ionic liquids (ILs) and two n-alkanes (n = 6, 7) are reported in the temperature range from (283.15 to 343.15) K at atmospheric pressure using the platinum ring method. The interfacial tensions show a linear decrease with increasing temperature. The obtained data were correlated by an empirical equation, and fitting interfacial tension parameters are presented.
The interfacial tensions of the liquid–liquid phase boundary of four 1-alkyl-3-methylimidazolium ([C
n
mim]BF4, n = 3, 4, 5, 6) based ionic liquids (ILs), namely, 1-propyl-3-methylimidazolium tetrafluoroborate [C3mim]BF4, 1-butyl-3-methylimidazolium tetrafluoroborate [C4mim]BF4, 1-pentyl-3-methylimidazolium tetrafluoroborate [C5mim]BF4, and 1-hexyl-3-methylimidazolium tetrafluoroborate [C6mim]BF4 with hexane, heptane, and cyclohexane, have been measured using the platinum ring method in the temperature range from (288.15 to 328.15) K at atmospheric pressure. A linear decrease of interfacial tensions with increasing temperature was observed, and the obtained data were fitted by an empirical equation. The influence of alkyl chain length of the cation of ionic liquid on interfacial tension is discussed.
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