1. Harbin Inst Technol, MIIT Key Lab Crit Mat Technol New Energy Convers, Harbin 150001, Peoples R China
2. Beijing Computat Sci Res Ctr, Beijing 100083, Peoples R China
3. Canadian Light Source Inc, Saskatoon, SK S7N 2V3, Canada
4. Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
5. Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada
6. Beihang Univ, Sch Phys, Beijing 100083, Peoples R China
折叠
Abstract
The atomically dispersed dual metal atom catalysts exhibit significant promise for the electrochemical energy conversion technologies. Herein, the hetero-nuclear precious-non-precious (Au-Co) dual atoms have been synthesized and subsequently applied for the acidic oxygen reduction reaction (ORR). The (Au-Co) dual atoms exhibit an outstanding activity with half-wave potential (E-1/2) of 0.82 V in 0.1 M HClO4. Additionally, the proton exchange membrane fuel cell (PEMFC) analysis reveals a peak power density of 360 mW cm(-2) under H-2/air condition. Co-N2C2 with axial Au atom moieties act as the active sites of the (Au-Co) dual atoms towards ORR. Further, *OH adsorbed on the Co atom induces a coordinated change in the adjacent Au atom symmetry, which leads the anti-bond spin orbitals to a low energy level, thus, further improving ORR performance. The development of (Au-Co) dual atoms via the regulation of D-orbitals symmetry provides an encouraging way to design highly efficient (electro)catalysts.
NSTL
Elsevier