Kết hợp Ag vào vật liệu khung hữu cơ kim loại Zr-CPEB nhằm gia tăng hoạt tính xúc tác điện cho phản ứng sinh khí hydro

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Tác giả: Thanh Thiện Cổ, Lê Hoàng Tấn Đoàn, Viết Hải Lê, Thị Quỳnh Hoa Nguyễn, Quang Bình Trần, Văn Mẫu Trần

Ngôn ngữ: vie

Ký hiệu phân loại: 537.85 Electricity and electronics

Thông tin xuất bản: Khoa học công nghệ Việt Nam, 2018

Mô tả vật lý: 41-45

Bộ sưu tập: Metadata

ID: 535500

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Ag@Zr-CPEB composite was synthesized by the incorporation of Ag metal into the Zr-CPEB metalorganic framework. The Zr-CPEB was synthesized from Zr(IV) salt and 1,4-bis(2-[4-carboxyphenyl]ethynyl) benzene (H2CPEB) linker by the solvent-thermal method. Ag metal was incorporated in Zr-CPEB via a two-step process, including (i) absorption of Ag(I) ions into the Zr-CPEB and (ii) reduction of the Ag(I) ions to Ag by NaBH4. The structure of Zr-CPEB was studied by Powder X-Ray Diffraction (PXRD). The presence of Ag in the composite was investigated by UV-Vis spectroscopy, FESEM energy dispersive X-ray (EDX), and TEM methods. Electro-catalytic properties of the Zr-CPEB support and Ag@Zr-CPEB composite were examined by the cyclic voltammetry (CV) method in 0.5 M Na2SO4 (pH 7.2) aqueous solution. The results showed that the amount of Ag in the as-prepared composite was ca. 2% wt. Ag had increased the catalytic activity of the composite for the hydrogen evolution reaction (HER). The current density (at 850 mV/RHE) for HER of the Ag@Zr-CPEB composite was increased by 2.5 times compared to that of Zr-CPEB.Vật liệu composite Ag@Zr-CPEB được tổng hợp trên cơ sở kết hợp kim loại Ag vào vật liệu khung hữu cơ kim loại Zr-CPEB. Vật liệu nên Zr-CPEB được tổng hợp từ muối kim loại Zr(IV) và 1,-4 bis(2[4-carboxyphenyllethynyl) benzene (H CPEB) theo phương pháp nhiệt dung môi. Kim loại Ag được đưa vào cấu trúc của Zr-CPEB theo quy trình hai giai đoạn gồm tấm ion Ag(l) lên cấu trúc Zr-CPEB và khử Ag(l) về Ag bằng NaBH. Cấu trúc của Zr-CPEB được xác nhận bằng phép đo nhiễu xạ tia X dạng bột (PXRD), sự hiện diện của Ag trong vật liệu composite được chứng minh bằng phương pháp đo UV-Vis, FESEM-EDS và TEM. Hoạt tính xúc tác điện hoá của vật liệu được khảo sát bằng phương pháp quét thế vòng tuần hoàn trong dung dịch Na 24SO 0, SM (pH 7 ,.2) Kết quả nhận được cho thấy, Ag chiếm 2% khối lượng và có tác động tăng cường hoạt tính xúc tác của vật liệu composite đối với phản ứng phân tách nước tạo Hz. Mật độ dòng sinh khí H ở quả thể 850 mV/RHE của vật liệu Ag@Zr-CPEB tăng 2,5 lần so với vật liệu nền Zr-CPEB.

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