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• W4306406502 endingPage "139807" @default.
• W4306406502 startingPage "139807" @default.
• W4306406502 abstract "In this work, OH - conducting membrane based on bacterial cellulose (BC) had been synthesized via modification with Poly(diallyldimethyl-ammonium chloride) (PDDA) and Poly(vinyl alcohol) (PVA) of different molecular weights using layer by layer method assisted by double cross-linking process. OH - conductivity and water uptake were intensively investigated by changing crosslinking conditions, KOH concentrations and different PVA molecular weights. Containing the maximum σ OH - reached up to 72.95 mS cm -1 at room temperature with water uptake being 877%, the LPVA-PDDA-BC-OH - membrane showed the lowest calculated activation energy value of 10.211 KJ mol -1 indicating that both Grotthus and vehicle mechanisms played an important role on ionic transportation. During the application of CO 2 electrochemical reduction (ERC) in 0.5 M KHCO 3 , the current density could reach up to 47.44 mA cm -2 at -1.06 V RHE while FE HCOO - achieved the maximum value of 67.89% which dampened only 7.09% after 20 h electrolysis. Furthermore, being assembled into the flexible zinc-air batteries (F-ZAB), the LPVA-PDDA-BC-OH - membrane exhibited excellent power density of 130.3 mW cm −2 at room temperature. • 1. Bacterial cellulose-based AEMs prepared by layer-by-layer/double-crosslinking method. • 2. OH - conductivity achieves 72.95 mS/cm at room temperature and 133.53 mS/cm at 80 o C. • 3. The current density of 51.34 mA/cm 2 at potential -1.36 V RHE can be achieved. • 4. The Faradaic efficiency of formate reaches up to 67.89% at -1.06 V RHE . • 5. OCV (1.42 V) and peak zinc-air battery power density (130.3 mW/cm 2 ) can be achieved. Through the combinations of layer-by-layer method and double cross-linking process, OH - conducting membrane based on bacterial cellulose (BC) had been synthesized with the modification by Poly (diallyldimethyl-ammonium chloride) (PDDA) and Poly (vinyl alcohol) (PVA) of different molecular weights. Under the help of PVA, an enhanced internal three-dimensional network could be easily constructed to overcome the disadvantage of excessively loosely binding in the BC membrane. Charge carrier PDDA were confirmed by FTIR and SEM to be firmly embedded into the network while studies on XRD and DSC indicated that amorphous content which was beneficial to ionic transfer and ions hopping held the large proportion in the membrane. Stability measurements such as thermogravimetric analysis, mechanical properties, alkaline and oxygen resistance were carried out, showing that the prepared membranes possessed excellent durable performance under various extreme conditions. Moreover, OH - conductivity and water uptake were intensively investigated by changing crosslinking conditions, KOH concentrations and PVA molecular weights. Achieving the maximum σ OH - of 72.95 mS cm -1 at room temperature, the LPVA-PDDA-BC-OH - membrane showed the lowest calculated activation energy value of 10.211 KJ mol -1 , indicating that both Grotthus and vehicle mechanisms played an important role on ionic transportation. When as-prepared LPVA-PDDA-BC-OH - membrane was applied for CO 2 electrochemical reduction (CO 2 ER) in 0.5 M KHCO 3 , current density could reach up to 47.44 mA cm -2 at -1.06 V RHE . Meanwhile, Faradaic efficiency for formate (FE HCOO - ) could achieve the maximum value of 67.89% that dampened only 7.09% after 20 h electrolysis. Furthermore, when as-prepared LPVA-PDDA-BC-OH - membrane was assembled into the flexible zinc-air batteries (F-ZAB), excellent power density of 130.3 mW cm −2 could be obtained at room temperature." @default.
• W4306406502 created "2022-10-17" @default.
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• W4306406502 date "2023-02-01" @default.
• W4306406502 modified "2023-10-18" @default.
• W4306406502 title "Structural-enhanced bacterial cellulose based alkaline exchange membranes for highly selective CO2 electrochemical reduction and excellent conductive performance in flexible zinc-air batteries" @default.
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