Transition-metal phosphosulfides (TMPSs) have recently shown outstanding electrocatalytic performances toward hydrogen evolution reaction (HER), superior to the sulfide and phosphide counterparts. However, there are only limited TMPSs available due to the synthetic challenge. Herein, we demonstrate a novel synthetic approach for copper phosphosulfide (CuPS) and the first application in photocatalytic HER. Based on the thermodynamic considerations of starting materials, two synthetic routes are designed to obtain two distinct crystal structures (CuS|P and Cu3P|S). Dramatically enhanced photocatalytic HER activities are achieved for both Cu3P|S (2,085 μmol g-1 h-1) and CuS|P (976 μmol g-1 h-1) without using co-catalysts. First-principles calculations unveil the underlying mechanism for the improved HER activity, in which the Gibbs free energy of hydrogen adsorption approaches close to 0 eV and the number of active sites considerably increases with the formation of CuPS structure. This work provides new insight and design principle on preparing TMPSs for high-performance energy conversion applications.
Bibliographical noteFunding Information:
This research was supported by The Hong Kong Polytechnic University (Grant No. 1-BE0Y ), Shenzhen Science, Technology and Innovation Commission (SZTIC, JCYJ20170818105046904 ), and the Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) of National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (Project No. 2013M3A6B1078882 ).
All Science Journal Classification (ASJC) codes
- Environmental Science(all)
- Process Chemistry and Technology