Nanoporous Silver Telluride for Active Hydrogen Evolution.
Hagyeong KwonDongyeon BaeDongyeun WonHeeju KimGunn KimJiung ChoHee Jung ParkHionsuck BaikAh Reum JeongChia-Hsien LinChing-Yu ChiangChing-Shun KuHeejun YangSuyeon ChoPublished in: ACS nano (2021)
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.
Keyphrases
- gold nanoparticles
- metal organic framework
- ionic liquid
- high resolution
- reduced graphene oxide
- electron microscopy
- highly efficient
- molecularly imprinted
- label free
- room temperature
- visible light
- single cell
- molecular dynamics simulations
- mass spectrometry
- computed tomography
- crystal structure
- magnetic resonance
- density functional theory
- molecular dynamics