@Article{jrm.2020.08650, AUTHOR = {Xianglong Lu, Tianshui Yu, Hailing Wang, Ruichun Luo, Pan Liu, Songliu Yuan, Lihua Qian}, TITLE = {Self-Supported Nanoporous Gold with Gradient Tin Oxide for Sustainable and Efficient Hydrogen Evolution in Neutral Media}, JOURNAL = {Journal of Renewable Materials}, VOLUME = {8}, YEAR = {2020}, NUMBER = {2}, PAGES = {133--151}, URL = {http://www.techscience.com/jrm/v8n2/38371}, ISSN = {2164-6341}, ABSTRACT = {Hydrogen evolution reaction (HER) in neutral medium suffers from slow kinetics as compared to that in alkaline or acidic conditions, owing to larger Ohmic loss and low proton concentration. Here we report that a self-supported nanoporous Au-SnOx (NP Au-SnOx) catalyst with gradient tin oxide surface could significantly enhance HER activity in neutral buffer solution (0.2 M PBS). The NP Au-SnOx catalyst exhibits a low onset overpotential of 38 mV and a small Tafel slope of 79 mV dec−1 . The current density of 10 mA cm−2 is manifested at an overpotential as low as 148 mV, representing the comparable performance of Pt/C catalyst. This high catalytic activity can retain at least 10 hours without any detectable decay. The superior HER activity is proposed to originate from the gradient SnOx structure and metal/oxide interfaces in nanoporous ligaments. Furthermore, the X-ray photoelectron spectroscopy reveals that the gradient oxide in the ligament is remarkably stable during long-term reaction.}, DOI = {10.32604/jrm.2020.08650} }