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.

BACKGROUND Ionic liquids (ILs) have been widely used in the field of SO2 separation for gases. In this study, two kinds of guanidinium‐based dicarboxylic acid ionic liquids including [1,1,3,3‐tetramethylguanidinium][Poly(ethylene glycol) bis(carboxymethyl) ether] ([TMG][PBE]) and [1,1,3,3‐tetramethylguanidinium] [Suberic acid] ([TMG][SUB]) were synthesized, and their absorption and desorption performance of SO2 were investigated. RESULTS The saturated molar ratio of SO2 to [TMG][PBE] and [TMG][SUB] were 8.74 and 5.96 mol SO2 per mole ILs at 25 °C, respectively. [TMG][PBE] saturated with SO2 was easier to desorb and could be recycled at least 5 times without loss of initial performance, while the ability to absorb SO2 by [TMG][SUB] was gradually weakened after desorption. The absorption mechanism is discussed. Results showed that SO2 could interact not only with the amino group on the cation but also with the methylene bonded to the carbonyl carbon on the anion for [TMG][SUB]. As for [TMG][PBE], SO2 could interact with the ether group by S‐O ligand interaction, instead of interacting with the methylene group bonded to the carbonyl carbon on the anion. [TMG][PBE] show good performance for SO2 capture. CONCLUSION The anion of dicarboxylic acid‐based ILs plays an important role in absorption/desorption of SO2 on the basis of the experimental results. © 2016 Society of Chemical Industry

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