| Autor: |
Wang, Yibo, Jiang, Jiadong, Shi, Zhaoping, Wu, Hongxiang, Yang, Jiahao, Wang, Pengbo, Hou, Shuai, Xiao, Meiling, Ge, Junjie, Liu, Changpeng, Xing, Wei |
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| Zdroj: |
Nano Research; Apr2024, Vol. 17 Issue 4, p2492-2498, 7p |
| Abstrakt: |
Stable and efficient single atom catalysts (SACs) are highly desirable yet challenging in catalyzing acidic oxygen evolution reaction (OER). Herein, we report a novel iridium single atom catalyst structure, with atomic Ir doped in tetragonal PdO matrix (IrSAs-PdO) via a lattice-confined strategy. The optimized IrSAs-PdO-0.10 exhibited remarkable OER activity with an overpotential of 277 mV at 10 mA·cm−2 and long-term stability of 1000 h in 0.5 M H2SO4. Furthermore, the turnover frequency attains 1.6 s−1 at an overpotential of 300 mV with a 24-fold increase in the intrinsic activity. The high activity originates from isolated iridium sites with low valence states and decreased Ir-O bonding covalency, and the excellent stability is a result of the effective confinement of iridium sites by Ir-O-Pd motifs. Moreover, we demonstrated for the first time that SACs have great potential in realizing ultralow loading of iridium (as low as microgram per square center meter level) in a practical water electrolyzer. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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