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https://doi.org/10.1016/j.apcatb.2023.123674
Title: | Unraveling the effect of local dopant environment on NiO<inf>6</inf> octahedron perturbation for enhanced oxygen evolution activity | Authors: | Yu, J Zhong, H Zhang, Q Wu, C Zhang, X Li, S Zhao, Y An, H Ma, Y Yu, Z Xi, S Wang, X Xue, J |
Issue Date: | 5-May-2024 | Publisher: | Elsevier BV | Citation: | Yu, J, Zhong, H, Zhang, Q, Wu, C, Zhang, X, Li, S, Zhao, Y, An, H, Ma, Y, Yu, Z, Xi, S, Wang, X, Xue, J (2024-05-05). Unraveling the effect of local dopant environment on NiO |
Abstract: | The oxygen evolution reaction (OER) performance in cation-doped materials often exhibits a volcano-like relationship with dopant concentration. However, the influence of dopant content with its associated local environment on the electronic states of electrocatalysts remains unclear. Herein, V is incorporated into Ni(OH)2 to study the underlying mechanism. It is revealed that evenly distributed V can effectively perturb the NiO6 octahedron, leading to strong eg * band broadening and more electronic states around the Fermi level. This phenomenon significantly enhances the electron transfer from electrocatalysts to external circuits. Conversely, the aggregation of V at higher dopant concentration exerts weaker influence on perturbing the NiO6 octahedron. As a result of balance between V doping and aggregation, Ni0.95V0.05OOH, with the strongest NiO6 octahedron distortion, effectuating a remarkably low overpotential of 258 mV at 10 mA cm−2. Furthermore, such a structure-activity relationship is also extended to Fe-doped Ni(OH)2, affirming the universality of the proposed mechanism. | Source Title: | Applied Catalysis B: Environmental | URI: | https://scholarbank.nus.edu.sg/handle/10635/248479 | ISSN: | 0926-3373 | DOI: | 10.1016/j.apcatb.2023.123674 |
Appears in Collections: | Staff Publications Elements |
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ACB_Manuscript.pdf | 4.98 MB | Adobe PDF | OPEN | None | Available on 05-05-2026 |
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