Nanoporous Silver Telluride for Active Hydrogen Evolution
- 주제(키워드) catalyst , electrochemical synthesis , hydrogen evolution reaction , nanoporous structure , silver telluride (AgTe) , X-ray spectroscopy
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 American Chemical Society
- 발행년도 2021
- URI http://www.dcollection.net/handler/ewha/000000181843
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acsnano.0c09517
초록/요약
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. © 2021 American Chemical Society.
more