Elewa A.MJayakumar JHuang Y.-WElsayed M.HChang C.-LTing L.-YLin W.-CChueh C.-CChou H.-H.CHU-CHEN CHUEH2022-03-222022-03-22202222133437https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120866945&doi=10.1016%2fj.jece.2021.106927&partnerID=40&md5=a08c134a4218cb454811422a5414c3dehttps://scholars.lib.ntu.edu.tw/handle/123456789/598127Conjugated polymer dots (Pdots) based on a series of BDT-based polymers with varied biaxially extended side-chain conjugations were prepared and employed for photocatalytic hydrogen production under visible light irradiation from aqueous solutions. The BDT-based polymers consisted of a dithiophedifluorobenzo[c][1,2,5]thiadiazole (DFBT) moiety as the acceptor unit and a BDT unit with different biaxially extended side-chains, including a alkyl-monothienyl group (T), a linear alkyl-dithiophene (2T) group, a branched alkyl-terthiophene (3T) group, and a fused alkyl-benzotrithiophene (B3T) group. The as-prepared Pdots based on these four polymers (PBDT-T, PBDT-2T, PBDT-3T, and PBDT-B3T) showed varied photophysical and electrochemical properties along with distinctive photocatalytic activity and long-term stability. Among them, the PBDT-B3T Pdots were showed to deliver a high photocatalytic efficiency of 14.1 mmol g?1 h?1 and a superior photocatalytic stability over 375 h in the presence of Pt as cocatalyst and ascorbic acid as sacrificial electron donors. Our results revealed that varying the structures of the biaxially extended side-chains endows a great flexibility in the photocatalytic activity of the polymers and the biaxially-extended conjugated side-chains can be a promising design strategy for the conjugated polymer to enhance the photocatalytic activity and stability. ? 2021 Elsevier LtdBenzodithiopheneBiaxial side-chain conjugationHydrogen evolutionPhotocatalystsPolymer dotsAscorbic acidHydrogen productionIrradiationLightPhotocatalytic activityStability5]thiadiazoleHydrogen-evolutionPhoto-catalyticPhotocatalytic activitiesPhotocatalytic hydrogen productionSide-chainsVisible-light irradiationConjugated polymers[SDGs]SDG7journal article10.1016/j.jece.2021.1069272-s2.0-85120866945