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Sb-doped SnS2 nanosheets enhance electrochemical reduction of carbon dioxide to formate
Luntong Yan,Zelin Wu,Congming Li,Junying Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
Electrocatalytic carbon dioxide (CO2) is a forward-looking strategy to convert renewable energy into fuel. Herein, we show that the novel Sb-doped SnS2 nanosheets were synthesized by a simple hydrothermalmethod for efficient electroreduction of CO2, and the atomic ratio of Sb/Sn was controllable. The introductionof Sb significantly enhanced the current density and Faradaic efficiency for formate products comparedto pristine SnS2 nanosheets. When the Sb content was 1%, the Sb-SnS2 nanosheets achieved aremarkable Faradaic efficiency of 90.86% for formate products at 1.1 V vs. RHE. The experimental resultsshowed that 1% Sb-doped SnS2 nanosheets changed the electronic structure of the Sn element, allowingthe catalyst to reconfigure to generate Sn0 during the electrochemical reaction, while the singlet tin had asynergistic effect with Sn4+, making it easier to transport electrons on the surface and promoting the activationprocess of CO2, which is a key factor to improve the electroreduction performance of CO2.
Rong Zeng,Renzhong Qiao,Zehu Wang,Hongran Wang,Liqiang Chen,Lin Yang,Liming Hu,Zelin Li 한국고분자학회 2012 Macromolecular Research Vol.20 No.4
Two kinds of chitosan-stavudine (d4T) conjugates, chitosan-O-isopropyl-5'-O-d4T monophosphate conjugate (Cs-P-d4T) with a phosphoramide linkage and chitosan-5'-O-succinyl-d4T conjugate (Cs-S-d4T) with a succinic spacer, were synthesized using an Atherton-Todd reaction and carbodiimide coupling reaction, respectively, and then structurally characterized. Their in vitro drug release behaviors and anti-human immunodeficiency virus (HIV) activity were investigated and compared. Both of the chitosan-d4T conjugates more strongly prefer to release corresponding d4T derivatives rather than free d4T in a prolonged manner but have different hydrolysis routes. The anti-HIV activity and cytotoxicity evaluated in the MT4 cell line revealed that the anti-HIV selectivity index was in the following order: Cs-P-d4T > d4T >> Cs-S-d4T since the released d4T-5'-(O-isopropyl) monophosphate from Cs-P-d4T can bypass the rate-limiting bottleneck of nucleoside phosphorylation, while the released 5'-O-succinyl-d4T from Cs-Sd4T has to be hydrolyzed to d4T and then successively phosphorylated to its active form to exert antiviral activity. The results suggested that constructing a chitosan-nucleoside reverse transcriptase inhibitor (NRTI) conjugate with a phosphoramide linkage may be an efficient approach for improving NRTI therapy efficacy in antiretroviral treatment.