Chemical transformations via postsynthetic modification of colloidal nanocrystals have received great attention as a rational synthetic route to unprecedented nanostructures. In particular, the cation exchange reaction is considered as an effective method to alter the composition of the starting nanostructures while maintaining the initial structural characteristics. Herein, we report the synthesis of highly crystalline Pd13Cu3S7 nanoplates (NPs) via partial cation exchange of the Cu1.81S phase by Pd cations, with Cu1.94S NPs and Pd13Cu3S7/Cu2-xS janus heterostructure as the intermediate phases. The highly crystalline Pd13Cu3S7 ternary NPs exhibit excellent electrocatalytic performance toward the hydrogen evolution reaction (HER) under acidic conditions. The HER activity of Pd13Cu3S7 NPs with its overpotential as low as 64 mV at -10 mA cm-2 is superior to those of amorphous PdCuS and commercial Pd/C catalysts, demonstrating the importance of nanocrystal crystallinity in boosting the HER activity. They also exhibit excellent stability as compared to commercial Pt/C and Pd/C under strongly acidic conditions.
Bibliographical noteFunding Information:
This work was supported by NRF-2017R1A2B3005682, KBSI project E37300, Korea University Future Research Grant, and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2017R1A6A3A01008861, 2018R1A6A3A01013426). S.H.J. was supported by the National Research Foundation of Korea (NRF-2017R1A2B2008464). H.J. acknowledges the Global Ph.D. Fellowship (NRF-2015H1A2A1033447). The authors thank Korea Basic Science Institute (KBSI) for the usage of their HRTEM instrument.
© 2018 American Chemical Society.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Materials Chemistry