TỔNG HỢP VẬT LIỆU NANO THẤP CHIỀU LÕI-VỎ MoS2\TiO2 ỨNG DỤNG TRONG XÚC TÁC ĐIỆN HÓA SINH KHÍ H2

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Tác giả: Anh Đức Nguyễn, Thị Xuân Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học - Trường Đại học Sư phạm Hà Nội: Khoa học Tự nhiên, 2023

Mô tả vật lý: tr.13

Bộ sưu tập: Metadata

ID: 341544

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In this report, we present the synthesis of low dimensional shell-core (2D\1D) nanostructures, in which the TiO2 nanorods (TNRs) as the core are covered by a continuous monolayer MoS2 (1L-MoS2) as the shell. The obtain 1L-MoS2\TNRs was directly grown on the conduct graphite foil without any transfer process, thus minimizing the charge transfer resistance from the electrode to the outer most working surface. For the first steps, the TiO2 seed layer was designed by the AF sputtering method, then the TNRs were grown by hydrothermal approach. Thereafter, the TNRs were conformally coated by a continuous monolayer MoS2 via a metal-organic chemical vapor deposition technique, resulting in 1L-MoS2\TNRs nanomaterial. The structural, vibrational, and morphological characteristics demonstrated that the samples are high crystallinity. Interestingly, the 1L-MoS2\TNRs showed highly efficient in electrochemical HER activity with the smallest onset overpotential of -140 mV vs RHE and a corresponding Tafel slope of 80 mV per decade, which were much lower compared to the pristine 1L-MoS2 and TNRs.Trong nghiên cứu này, chúng tôi trình bày phương pháp chế tạo cấu trúc nano tổ hợp dị thể thấp chiều dạng lõi vỏ (2D\1D), trong đó lõi là thanh nano TiO2 (TNRs) được phủ bởi lớp vỏ là đơn lớp MoS2 (1L-MoS2). Cấu trúc nano 1L-MoS2\TNRs được mọc trực tiếp trên tấm than chì, do lược bỏ được các bước chuyển màng truyền thống, nên đã hạn chế tối đa trở kháng trong sự dịch chuyển điện tử từ điện cực đến vị trí hoạt động ở mặt phía ngoài cùng. Trước tiên, các TNRs được tạo mầm bằng kĩ thuật phún xạ trên đế than chì sau đó được nuôi dài bằng phương pháp thủy nhiệt. Tiếp đến, các TNRs được bao phủ bởi 1L-MoS2 bằng phương pháp lắng đọng pha hơi hóa học sử dụng tiền chất hữu cơ (metal organic chemical vapor deposition - MOCVD), thu được 1L-MoS2\TNRs. Các phép đo đặc tính cấu trúc, dao động mạng tinh thể và hình thái học chứng tỏ rằng vật liệu kết tinh tốt. Thú vị rằng, 1L-MoS2\TNRs thể hiện hiệu quả xúc tác điện hóa cao hơn hẳn các vật liệu đơn (1L-MoS2 và TNRs), với quá thế onset nhỏ (140 mV vs RHE) và độ dốc Tafel nhỏ, xấp xỉ 80 mV\dec.

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