Author: diyan.wang

31 Jan. 2022, Prof. Wang received 2021 CSLT, Outstanding Young Chemical Researcher Award

https://chemistry.org.tw/news-single.php?mTitle=department&temp_id=724

Enhanced Hydrogen Evolution Efficiency Achieved by Atomically Controlled Platinum Deposited on Gold Nanodendrites with High-Index Surfaces

Ying-Huang Lai,¹*Sin-Ren Li,^1# Swathi M G,^1#Hsiao-Tzu Chang,^1# Yu-Bin Huang,¹ Yen-Ken Li,¹ Yu-Mei Chen,¹ Shivaraj B. Patil,¹Shu-Yi Chang,¹ Po-Kai Chen,¹ Chia-Che Chang,¹ Yi-Chia Chen,¹ Chih-Wen Pao,² Jeng-Lung Chen,² Chuan-Yu Wei,³ I-Kuan Lin,³ Hung-Lung Chou,⁴Chun-Jen Su,²U-Ser Jeng,^2,5 Tsung-Rong Kuo,⁶ Cheng-Yen Wen,^3,7,8 Di-Yan Wang¹*

 

https://doi.org/10.1039/D1TA07066E

There have been lots of studies on hydrogen evolution reaction (HER) catalytic activity using ultralow loading of Pt catalysts or even Pt single atom catalysts as well. However, Pt single atom deposited on the surface of the carbon or metal oxide material showed some drawbacks, such as high possibility of Pt desorption from the supported material in the electrolyte. Besides, from the reaction mechanism perspective, each Pt atom in this type of catalyst was too far to achieve high HER efficiency via Tafel reaction pathway. In this work, gold nanodendrites (Au NDs) with high facet surface was chosen as the supported materials for studying the relation between the low loading amount of Pt atoms and reaction mechanism of HER activity. The atomic deposition of Pt atoms on the surface of Au NDs can be controlled effectively by using a constant-current synthetic method. It’s found that the HER electrocatalytic activity of ultralow Pt loading catalyst, Pt atoms to total surface atoms of Au NDs (O-Pt on Au NDs) was only 5.5%, could achieve high efficiency via Tafel reaction pathway, showing a low overpotential of ~18 mV at a current density of 10 mA cm⁻² and a small Tafel slope of ~31 mV dec^-1 which is close to that of commercial Pt/C with 20wt% Pt. Confirmed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS), Pt loading amount of O-Pt on Au NDs was ~3.8 ± 0.2mg/cm² on a physical area of carbon fibre paper. The turnover frequency (TOF) of O-Pt on Au NDs was achieved to be 40.1 ± 2.5H₂ s⁻¹ at 50 mV. This work provides a feasible approach to control atomic deposition of Pt element on the specific substrate as active catalysts for various catalytic applications.

Congratulations, 

Shivaraj on successfully defending his dissertation and becoming Dr. Shivaraj B. Patil!

Dr. Shivaraj B. Patil received his PhD’s degree from Tunghai University, Taiwan in 2021. In the three years of his PhD life, He focuses on electrocatalytic catalysis and energy storage systems. He has published five first-author papers on JMCA, Small, PCCP and ACS AMI, etc. The Di-Yan Lab wishes you the very best luck in your future.

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