Nanoporous Silver Telluride for Active Hydrogen Evolution
- 저자명
Hagyeong Kwon, Dongyeon Bae, Dongyeun Won, Heeju Kim, Gunn Kim, Jiung Cho, Hee Jung Park, Hionsuck Baik, Ah Reum Jeong, Chia-Hsien Lin, Ching-Yu Chiang, Ching-Shun Ku, Heejun Yang, and Suyeon Cho
- 저널명
ACS Nano
- 게재권/집
15
- 페이지
6540 ~ 6550
- 발표일
2021-03-30
- URLhttps://doi.org/10.1021/acsnano.0c09517
Silver-based nanomaterials have been versatile building blocks of various photoassisted energy applications; however, they have demonstrated poor electrochemical catalytic performance and stability, in particular, in acidic environments. Here we report a stable and high-performance electrochemical catalyst of silver telluride (AgTe) for the hydrogen evolution reaction (HER), which was synthesized with a nanoporous structure by an electrochemical synthesis method. X-ray spectroscopy techniques on the nanometer scale and high-resolution transmission electron microscopy revealed an orthorhombic structure of nanoporous AgTe with precise lattice constants. First-principles calculations show that the AgTe surface possesses highly active catalytic sites for the HER with an optimized Gibbs free energy change of hydrogen adsorption (−0.005 eV). Our nanoporous AgTe demonstrates exceptional stability and performance for the HER, an overpotential of 27 mV, and a Tafel slope of 33 mV/dec. As a stable catalyst for hydrogen production, AgTe is comparable to platinum-based catalysts and provides a breakthrough for high-performance electrochemical catalysts.