ABSTRACT Donor‐acceptor (D‐A) conjugated materials based on molecular motion have potential advantages in solar‐thermal conversion technology due to their capability to significantly enhance photothermal conversion efficiency. However, resolving the inherent balance between conjugation extension and molecular motion in organic D‐A materials remains a key challenge. Herein, we present an innovative design strategy for constructing high‐performance solar‐thermal materials: a) D‐A conjugated backbone constructed with 1,2,5thiadiazolo3,4‐gquinoxaline‐6,7‐dicarboxylate (BTQ) and various thiophene‐based donor units enable enhanced intramolecular charge transfer; b) long alkyl chains incorporated into D‐A backbone afford more intramolecular rotational space for polymers; c) donor units screened for optimal volume and conjugation degree weigh conjugation extension against group rotation. The objective is to develop materials exhibiting excellent solar spectrum matching while elucidating the mechanism of efficient solar‐thermal conversion. Therefore, three narrow bandgap conjugated polymers PT‐BTQ, PTT‐BTQ, and PIDT‐BTQ are synthesized. Among them, PTT‐BTQ has the widest spectral absorption of 300–2000 nm and the photothermal conversion efficiency of 20.20%. Furthermore, a multifunctional solar‐thermal thermoresponsive hydrogel (STH‐TT) is prepared, which can achieve a remarkable total water collection rate of 9.78 kg m −2 h −1 under one sun irradiation. Moreover, a lightweight and portable sewage purifier is developed to solve the problem of freshwater scarcity in extreme environments.
Wang et al. (Sun,) studied this question.
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