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- Title
Surface Phosphation of 3D NiCo<sub>2</sub>O<sub>4</sub> Nanowires Grown on Ni Foam as an Efficient Bifunctional Catalyst for Water Splitting.
- Authors
Cheng, Lanzi; Zhang, Rui; Lv, Weixin; Shao, Luyu; Wang, Zheng; Wang, Wei
- Abstract
Highly efficient, cost-effective and durable electrocatalysts for water splitting are crucial for energy conversion and storage. Transition-metal phosphides have been proven to be efficient catalysts for water splitting. In this paper, surface phosphation of 3D NiCo2O4 nanowires grown on Ni foam (P-NiCo2O4/NF) have been prepared to investigate the effect of surface phosphating on catalyst activity. XRD and XPS results demonstrate that P element has been decorated on the surface of the NiCo2O4 nanowires. The electrochemical results prove that P-NiCo2O4/NF shows better electrochemical performance than pure NiCo2O4/NF as an electrode for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) of water splitting. It achieves a current density of 10 mA cm2 at an overpotential of 279 mV and 164 mV for OER and HER in 1.0 M KOH electrolyte, respectively. In addition, the P-NiCo2O4/NF ∥ P-NiCo2O4/NF electrode is constructed by employing P-NiCo2O4/NF as both the anode and cathode, it only requires a low 1.68 V of cell voltage to reach the current density of 10 mA cm − 2 . Notably, P-NiCo2O4/NF ∥ P-NiCo2O4/NF also exhibits excellent stability for over 30 h-long. These results indicate that surface phosphation is an effective approach to improve the electrochemical performance of NiCo2O4/NF electrode materials. XRD and XPS spectrum analyses confirmed that P has been doped onto the surface of NiCo2O4/NF nanowires. An overall water-splitting device was assembled into a two-electrode configuration using P-NiCo2O4/NF as both the anode and cathode in 1.0 M KOH to investigate the overall water splitting efficiency. The P-NiCo2O4/NF ∥ P-NiCo2O4/NF electrolyzer achieves a low voltage of 1.68 V at 10 mA cm–2, which is better than that of NF ∥ NF (1.84 V) and NiCo2O4/NF ∥ NiCo2O4/NF (1.74 V).
- Subjects
ELECTROCATALYSTS; NANOWIRES; ENERGY conversion; FOAM; HYDROGEN evolution reactions; STANDARD hydrogen electrode; ENERGY storage; ANODES
- Publication
NANO, 2020, Vol 15, Issue 2, pN.PAG
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292020500241