Charged excited state induced by ultrathin nanotip drives highly efficient hydrogen evolution
| Autor: | Longlu Wang, Junhong Guo, Gang Zhou, Peifang Wang, Youyou Hu, Liyuan Long, Yun Shan, Chenguang Zhang, Lizhe Liu, Yamei Zhang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Tafel equation
Valence (chemistry) Materials science Process Chemistry and Technology Doping 02 engineering and technology Electronic structure Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences Chemical physics Excited state Metastability Water splitting 0210 nano-technology General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 262:118305 |
| ISSN: | 0926-3373 |
| Popis: | Engineering the localized electronic structure is an intriguing way to regulate the charged valence state of materials for various potential applications. Here, we show that electrocatalytic reactions relevant for water splitting can be boosted by the charged excited state generated from tip-induced localized electron. Using intentionally fabricated acicular NiCo2S4-xPx nanowire array, on which charged H2O molecules are driven to metastable excited state to efficiently reduce activation barrier and enhance carrier transfer, the overpotential at 10 mA cm−2 required for hydrogen evolution was decreased to 75 mV and the Tafel slope was lowered to 42.3 mV per decade. This work, distinct from conventional doping and defecting strategy, provides a new insight into the underlying catalytic mechanism and functionalities of material’s catalytic properties via simple structural engineering. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect