Bọt graphene meso được hình thành từ zeolite với các khiếm khuyết có thể điều chỉnh như những chất xúc tác hiệu quả cho phản ứng khử oxy

Journal of Materials Science - Tập 56 - Trang 19589-19598 - 2021
Li Wang1, Yi Wang2
1Center of Analysis and Measurement, Fudan University, Shanghai, People’s Republic of China
2State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-Dimension Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, People’s Republic of China

Tóm tắt

Trong nghiên cứu này, bọt graphene meso được định hình bằng zeolite đã được tổng hợp dễ dàng thông qua quá trình nhiệt phân dưới các nhiệt độ khác nhau cho phản ứng khử oxy. Các cuộc điều tra cho thấy rằng MGF có thể được điều chỉnh với các tính chất cấu trúc khác nhau bằng cách kiểm soát nhiệt độ nhiệt phân, trong đó MGF-900 (đã nhiệt phân ở 900°C) sở hữu diện tích bề mặt riêng BET lớn (619 m2 g−1), một khung carbon có cấu trúc vi mô - meso - vĩ mô phân cấp, và sự cân bằng tốt hơn giữa độ dẫn điện và các điểm hoạt động so với các mẫu khác (MGF-800 và MGF-1000). Kết quả, MGF-900 thể hiện hoạt tính xúc tác xuất sắc nhất với điện thế khởi đầu dương nhất là − 0,1 V và mật độ dòng điện cao nhất là 5,01 mA cm−2 trong số các mẫu khác nhau và nhiều chất xúc tác dựa trên carbon khác đã được báo cáo. Quan trọng hơn, mặc dù không có sự doping của các nguyên tử khác, hoạt tính xúc tác của MGF-900 gần như tương đương với của chất xúc tác Pt/C thương mại. Về khả năng dung nạp và độ ổn định, MGF-900 còn thể hiện tốt hơn. Do đó, với tư cách là một chất xúc tác điện luyện kim không chứa kim loại vượt trội, MGF-900 được chứng minh là ứng dụng tốt trong phản ứng khử oxy hiệu quả cao.

Từ khóa

#Bọt graphene #phản ứng khử oxy #xúc tác không kim loại #nhiệt phân #cấu trúc carbon

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