Nanoparticle PtRu được hỗ trợ trên các ống nano carbon nhiều lớp chức năng p-phenylenediamine: tăng cường hoạt động và độ ổn định cho quá trình oxi hóa methanol

Ionics - Tập 25 - Trang 181-189 - 2018
Bohua Wu1, Jiajin Zhu1, Xue Li1, Xiaoqin Wang1, Jia Chu1, Shanxin Xiong1
1College of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an, People’s Republic of China

Tóm tắt

Một phương pháp đơn giản đã được phát triển để chuẩn bị các electrocatalyst nanoparticle PtRu/ống nano carbon nhiều lớp (MWCNTs) cho quá trình oxi hóa methanol. Bắt đầu từ các MWCNTs nguyên chất, sự phân tán cao của các nanoparticle PtRu đã được lắp ráp trực tiếp trên bề mặt của MWCNTs bằng cách sử dụng p-phenylenediamine (PPDA) làm chất liên kết trung gian. Các nghiên cứu bằng phổ FTIR và Raman cho thấy rằng PPDA có thể được cố định trên MWCNTs nguyên chất nhờ vào sự xếp chồng π-π, và cấu trúc toàn phần của MWCNTs được bảo tồn sau khi sửa đổi. Các điều tra bằng TEM và XRD cho thấy rằng cấu trúc khối lập phương mặt trung tâm (fcc) của các nanoparticle PtRu hợp kim với đường kính trung bình 3.5 ± 0.5 nm được hỗ trợ đồng nhất trên bề mặt của MWCNTs chức năng PPDA (PPDA-MWCNTs). Catalyst PtRu/PPDA-MWCNTs thu được cho thấy điện thế khởi đầu âm tính hơn (-0.15 V) so với PtRu/MWCNTs (-0.33 V), cho thấy hoạt động điện hóa cao hơn đối với quá trình oxi hóa methanol, trong khi mật độ dòng điện đỉnh tiến về phía trước (731.6 mAmg−1 của Pt) gấp 1.66 lần so với PtRu/MWCNTs (440.5 mAmg−1 của Pt). Catalyst PtRu/PPDA-MWCNTs cũng cho thấy dòng điện trạng thái ổn định tăng cường đáng kể và độ ổn định lâu dài. Kích thước nhỏ hơn, phân tán tốt hơn và diện tích bề mặt điện hóa cao hơn (73.5 m2 g−1) của các nanoparticle PtRu trên PPDA-MWCNTs dẫn đến hiệu suất điện hóa vượt trội đối với quá trình oxi hóa methanol. Công trình này có thể cung cấp một phương pháp hiệu quả để chế tạo các catalyst kim loại quý hỗ trợ MWCNTs cho nhiều ứng dụng trong hệ thống năng lượng và thiết bị cảm biến.

Từ khóa


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