Uniform distribution of electrochemically active transition metal compounds on carbon cloth can effective improve their hydrogen evolution reaction (HER) performance, however, harsh chemical treatment of carbon substrates is always unavoidable during this process. Herein, a hydrogen protonated polyamino perylene bisimide (HAPBI) was used as interface active agent for the in situ growth of rhenium (Re) doped MoS 2 nanosheets on carbon cloth (Re-MoS 2 /CC). HAPBI contains a large conjugated core and multiple cationic groups and has been shown to be an effective graphene dispersant . It endowed the carbon cloth excellent hydrophilicity through simple noncovalent functionalization and, meanwhile, provided sufficient active sites to anchor MoO 4 2- and ReO 4 - via electrostatic interaction . Uniform and stable Re-MoS 2 /CC composites were facilely obtained by immersing carbon cloth in HAPBI solution followed by hydrothermal treatment in the precursor solution. The doping of Re induced the formation of 1 T phase MoS 2 , which reached about 40% in the mixture with 2H phase MoS 2 . Electrochemical measurements showed an overpotential of 183 mV at a current density of 10 mA cm −2 in 0.5 mol L -1 H 2 SO 4 when the molar ratio of Re to Mo is 1:100. This strategy can be further extended to construct other electrocatalysts that using graphene, carbon nanotubes , etc. as conductive additives.
The precise design and synthesis of active sites to improve catalyst’s performance has emerged as a promising tactic for electrochemistry. However, it is challenging to combine different types of active sites and manipulate them simultaneously at atomic resolution. Here, we present a strategy to synthesize Re atom-doped Cu twin boundaries (TBs), through pulsed electrodeposition and boundary segregation. The Re-doped Cu TBs demonstrate a highly efficient nitrogen reduction reaction (NRR) performance. Re-doped Cu TBs showed a turnover frequency of ∼5889 s–1, ∼800 times higher than the pure Cu TB active centers (∼7 s–1). In addition to the “acceptance–donation” activation of N2 molecules, theoretical calculations also reveal that the Re–Re dimer on TB can boost the NRR and impede the hydrogen evolution reaction synchronously, rendering Re-doped Cu TB catalysts with high NRR activity and selectivity.
Yushu Han,Xin Kong,Rui Bao,Jianhong Yi,Liang Liu,Ying Gu,Lunzhao Yi
The bottom-up approach serves as an efficacious and noteworthy method for the synthesis of carbonized polymer dots (CPDs). In the present investigation, rhenium-doped CPDs (Re-CPDs) were successfully synthesized via a hydrothermal technique employing citric acid , urea, and NH 4 ReO 4 . Subsequent to a comprehensive series of characterizations, Re-CPDs demonstrated an average particle size of 2.67 nm, excitation/emission maxima of 377/461 nm, and an elevated quantum yield of 45.36% at 377 nm excitation. Through the selectivity analysis involving various metal ions , Re-CPDs displayed sensitivity towards Fe 3+ and Mo 6+ ions, with limits of detection (LODs) of 0.02 μM and 0.48 μM, respectively. Furthermore, Re-CPDs exhibited multi-chromatic fluorescence (450–550 nm) under excitation wavelengths (375–430 nm). As a result, by amalgamating Re-CPDs with sucrose, detection patterns capable of generating multi-chromatic fluorescence at excitation wavelengths of 375, 395, and 430 nm, respectively, were successfully devised. In summary, Re-CPDs hold considerable potential as a material for the detection of Fe 3+ and Mo 6+ ions, as well as for anti-counterfeiting ink applications.
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