دورية أكاديمية
A Self‐Reconstructed Bifunctional Electrocatalyst of Pseudo‐Amorphous Nickel Carbide @ Iron Oxide Network for Seawater Splitting
| العنوان: | A Self‐Reconstructed Bifunctional Electrocatalyst of Pseudo‐Amorphous Nickel Carbide @ Iron Oxide Network for Seawater Splitting |
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| المؤلفون: | Hao Zhang, Songyuan Geng, Mengzheng Ouyang, Hossein Yadegari, Fang Xie, D. Jason Riley |
| المصدر: | Advanced Science, Vol 9, Iss 15, Pp n/a-n/a (2022) |
| بيانات النشر: | Wiley, 2022. |
| سنة النشر: | 2022 |
| المجموعة: | LCC:Science |
| مصطلحات موضوعية: | iron oxide, lattice oxygen, nickel carbide, seawater splitting, self‐reconstruction, Science |
| الوصف: | Abstract Here, a sol‐gel method is used to prepare a Prussian blue analogue (NiFe‐PBA) precursor with a 2D network, which is further annealed to an Fe3O4/NiCx composite (NiFe‐PBA‐gel‐cal), inheriting the ultrahigh specific surface area of the parent structure. When the composite is used as both anode and cathode catalyst for overall water splitting, it requires low voltages of 1.57 and 1.66 V to provide a current density of 100 mA cm−2 in alkaline freshwater and simulated seawater, respectively, exhibiting no obvious attenuation over a 50 h test. Operando Raman spectroscopy and X‐ray photoelectron spectroscopy indicate that NiOOH2–x active species containing high‐valence Ni3+/Ni4+ are in situ generated from NiCx during the water oxidation. Density functional theory calculations combined with ligand field theory reveal that the role of high valence states of Ni is to trigger the production of localized O 2p electron holes, acting as electrophilic centers for the activation of redox reactions for oxygen evolution reaction. After hydrogen evolution reaction, a series of ex situ and in situ investigations indicate the reduction from Fe3+ to Fe2+ and the evolution of Ni(OH)2 are the origin of the high activity. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2198-3844 20220014 |
| Relation: | https://doaj.org/toc/2198-3844 |
| DOI: | 10.1002/advs.202200146 |
| URL الوصول: | https://doaj.org/article/a976194308914fbb8557a0a944dabf1b |
| رقم الأكسشن: | edsdoj.976194308914fbb8557a0a944dabf1b |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 21983844 20220014 |
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| DOI: | 10.1002/advs.202200146 |