Synergistic effect between undercoordinated platinum atoms and defective nickel hydroxide on enhanced hydrogen evolution reaction in alkaline solution
Autor: | Fei Gao, Chenglong Luan, Jun Li, Xiaoping Dai, Kuomiao Yu, Meiling Wang, Xin Zhang, Hongying Zhuo, Lei Yu, Yao Wang, Yun Xiao |
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Rok vydání: | 2018 |
Předmět: |
Nanocomposite
Materials science Renewable Energy Sustainability and the Environment chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Dissociation (chemistry) 0104 chemical sciences Catalysis Nickel chemistry.chemical_compound Chemical engineering chemistry Hydroxide General Materials Science Density functional theory Electrical and Electronic Engineering 0210 nano-technology Platinum |
Zdroj: | Nano Energy. 48:590-599 |
ISSN: | 2211-2855 |
DOI: | 10.1016/j.nanoen.2018.03.080 |
Popis: | Improving the hydrogen evolution reaction (HER) performance of Pt based catalysts in alkaline environment is of key importance in various industrial processes and remains a challenge so far. Given the lower energy barriers of water dissociation upon the undercoordinated Pt and oxophilic species, engineering Pt based catalysts possessed the high density of surface atomic steps, ledges, and kinks with Ni(OH)2 are an effective way to endow Pt with high catalytic HER activity. Based on density functional theory (DFT) models, we demonstrated that the energy barrier of water dissociation process could be significantly reduced by the synergistic effect of undercoordinated Pt atoms and defective Ni(OH)2. This hypothesis has been further validated by experimental results that concave nanocube (CNC) Pt-Mn particles exposed by high indexed facets (HIFs) supported on the Ni(OH)2 nanosheets exhibited 6.88 times specific current density (4.80 times mass current density) higher than nanocube Pt-Mn particles mainly exposing non-defective surface. Moreover, the in situ electrochemical etching experiments suggested that the enhanced HER performance was attributed to the synergistic effect of Ni(OH)2 and Pt, rather than the increase of active sites for Pt via calculating the electrochemical surface area (ECSA) values. Thus, this work provides an insight for rational design of Pt based nanocomposite with enhanced catalytic properties for alkaline HER under the guidance of computational modeling. |
Databáze: | OpenAIRE |
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