Sự hình thành tại chỗ và tích hợp graphene vào khoảng cách giữa các lớp MoS2: mở rộng khoảng cách giữa các lớp cho phản ứng phát triển hydro vượt trội trong điện phân axit và kiềm

Journal of Materials Science - Tập 57 - Trang 18993-19005 - 2022
Hoa Thi Bui1,2, Do Chi Linh2, Lam Duc Nguyen2, HyungIl Chang3, Supriya A. Patil4, Nabeen K. Shrestha5, Khuyen Xuan Bui1,2, Tung Son Bui1,2, Thi Ngoc Anh Nguyen2, Nguyen Thanh Tung1,2, Sung-Hwan Han3, Pham Thy San2
1Graduate University of Science and Technology Vietnam Academy of Science and Technology Hanoi Vietnam
2Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam
3Department of Chemistry, Institute of Materials Design, Hanyang University, Seoul, Republic of Korea
4Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, Republic of Korea
5Division of Physics and Semiconductor Science, Dongguk University, Seoul, Republic of Korea

Tóm tắt

Để sản xuất hydro quy mô thương mại từ nước, việc phát triển các chất xúc tác phong phú về tài nguyên và giá cả cạnh tranh là yêu cầu cấp thiết, tuy nhiên, việc thay thế các chất xúc tác hiện đại dựa trên kim loại quý gặp nhiều thách thức. Trong bài báo này, chúng tôi báo cáo về vật liệu dị cấu trúc MoS2@graphene (MoS2@Gr) như một chất xúc tác điện hóa hứa hẹn cho phản ứng phát triển hydro (HER), được tổng hợp thông qua việc hình thành tại chỗ và tích hợp graphene vào khoảng cách giữa các lớp của MoS2, qua đó làm lộ các vị trí hoạt động của HER bằng cách mở rộng khoảng cách giữa các lớp. So với MoS2 nguyên bản, MoS2@Gr thể hiện hoạt động HER vượt trội với một điện thế dư 120 mV so với RHE để thúc đẩy mật độ dòng điện đạt 10 mA cm−2 với độ dốc Tafel nhỏ 72 mV dec−1 trong dung dịch H2SO4 0.5 M. Ngoài ra, chất xúc tác MoS2@Gr chỉ cần một điện thế dư 170 mV so với RHE trong điện phân KOH 1 M để tạo ra mật độ dòng điện HER đạt 10 mA cm−2 với độ dốc Tafel nhỏ hơn 51 mV dec−1. Hơn nữa, chất xúc tác MoS2@Gr cho thấy độ bền dài hạn với HER trong cả điện phân axit và kiềm.

Từ khóa


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