Kết hợp cặp acid–base dựa trên polyoxometalat vào MIL-101 sulfonat nhằm đạt được vật liệu dẫn proton với độ dẫn proton cao và độ ổn định cao

Springer Science and Business Media LLC - Tập 4 - Trang 130-137 - 2021
Wan-Yu Zhang1, Ying Lu1, Zhuo Li1, Yang Wang1, Xiu-Wei Sun1, Qian Wang1, Zhong Zhang1, Shu-Xia Liu1
1Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, China

Tóm tắt

Hiện nay, việc phát triển các vật liệu dẫn proton mới với độ dẫn proton cao, độ ổn định cao và độ bền dẫn tốt là rất quan trọng để đáp ứng nhu cầu của pin nhiên liệu và cảm biến. Chúng tôi đã điều chế hai hợp chất DETA-HPW@MIL-101-SO3H 1 và TETA-HPW@MIL-101-SO3H 2 (DETA = diethylenetriamine, HPW = H3PW12O40·xH2O, MIL = Material Institut Lavoisier, TETA = triethylenetetramine) bằng cách đóng kén polyoxometalat (POM) và amin hữu cơ vào một MIL-101 sulfonat thông qua phương pháp nhúng từng bước. Thật vui mừng, 1 và 2 có độ dẫn proton cao tương ứng là 6.4 × 10−2 và 2.9 × 10−2 S·cm−1 ở 65 °C và độ ẩm tương đối 95% (RH), điều này có thể được lý giải bởi quá trình chuyển proton nhanh chóng giữa các cặp acid–base hình thành giữa HPW và amin hữu cơ cũng như giữa acid sulfonic và amin hữu cơ. Hơn nữa, thử nghiệm độ dẫn proton theo thời gian cho thấy rằng các thuộc tính dẫn proton của chúng có độ ổn định và độ bền tốt, điều này có được nhờ vào sự tương tác tĩnh điện giữa các cặp acid–base và sự hạn chế kích thước mở của MIL-101-SO3H giúp HPW và amin hữu cơ tồn tại ổn định trong các ô của MIL-101-SO3H. Các thuộc tính dẫn proton đáng chú ý (độ dẫn proton cao và độ ổn định cao) của hai hợp chất này khiến chúng trở thành các vật liệu dẫn proton tiềm năng.

Từ khóa

#vật liệu dẫn proton #sulfonat #polyoxometalat #độ dẫn proton #độ ổn định

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