Stable Pt atomic clusters on carbon nanotubes grafted with carbon quantum dots as electrocatalyst for H2 evolution in acidic electrolyte

Nano Select

卷:2

Rongzheng Liu¹  Zhichun Si²  Feiyu Kang²  Junwei Liang²  Yuxiang Liu²  Sufan Zheng²  Duan Weng² 

[1] Institute of nuclear and new energy technology Tsinghua University Beijing China;

[2] Shenzhen International Graduate School Tsinghua University Shenzhen China;

关键词: acidic electrolyte;    carbon nanotubes;    carbon quantum dots;    H2 evolution;    Pt atomic clusters;   

DOI  :  10.1002/nano.202100079

来源: DOAJ

【 摘 要 】

Abstract Preparing stable highly dispersed Pt based electrocatalyst is promising to reduce material expense of H2 product via electrocatalytic water splitting. However, it is still a great challenge to obtain stable single atomic Pt catalysts which can be applied in acidic electrolyte. In the present work, we synthesized Pt atomic clusters on carbon quantum dots (CQDs) grafting multiwall carbon nanotube (CNT) (Pt content: 1 wt.%) catalysts and then loading the catalysts on carbon cloth (Pt content: 0.01 mg▪cm–2) for activity test. The overpotential of 29 mV versus RHE was obtained over 1%Pt/CQDs/CNT catalysts at the current density of 10 mA▪cm–2, and the Tafel slope of 22 mV decade–1 was obtained, too. Especially, the catalysts showed significant stability in hydrogen evolution reactions (HER) in acidic solution, of which the overpotential was still smaller than that of 20%Pt/C after 10,000 CV cycles. CQDs provided coordinating sites for dispersing Pt atomic clusters and improved the H+ concentration in adjacent area around the Pt clusters. This method provides a general strategy to design the highly efficient electrocatalysts with ultra‐low precious metals for H2 evolution in acidic electrolyte.

【 授权许可】

Unknown