1. High-efficient and durable overall water splitting performance by interfacial engineering of Fe-doped urchin-like Ni2P/Ni3S2 heterostructure.
- Author
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Chen, Wei-Zhe, Liu, Peng-Yu, Zhang, Lei, Liu, Yang, Liu, Zhiliang, He, Jinlu, and Wang, Yan-Qin
- Subjects
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HYDROGEN evolution reactions , *OXYGEN evolution reactions , *CATALYST structure , *ENGINEERING , *ELECTRONIC structure - Abstract
A novel Fe-doped urchin-like Ni 2 P/Ni 3 S 2 (NPZFNS@C/NF) heterostructure with abundant hetero-interfaces and carbon-coating is successfully constructed, which exhibits outstanding oxygen evolution reaction (OER) performance and excellent hydrogen evolution reaction (HER) performance. Furthermore, it also exhibits a small overpotential of 1.5 V for overall water splitting with NPZFNS/NF as both anode and cathode, lower than most of non-noble metal-based bifunctional electrocatalysts reported. [Display omitted] • Fe-doped Fe-Ni 3 S 2 /Ni 2 P@C/NF hetero-interface electrocatalyst is firstly constructed. • The catalyst shows oustanding OER and excellent HER performances. • It can act as a bifunctional catalyst toward excellent overall water splitting bebavior. • The unique electronic structure of the catalyst is the intrinsic reason for the excellent OER and HER performances. • DFT calculations further reveal the changes the d-band center and the rate-degerming step. Interfacial engineering is an efficient strategy to develop electrocatalysts with excellent performance. By using this strategy, a novel Fe-doped urchin-like Ni 2 P/Ni 3 S 2 (NPZFNS@C/NF) heterostructure with metal–organic frameworks (MOFs) as the precursor in-suit grows on nickel foam (NF) with abundant hetero-interfaces and carbon-coating is successfully constructed. Owing to the existence of hetero-interfaces and carbon coating, the unique surface electronic structure and d-band center of NPZFNS@C/NF are also obtained. Benefiting from the regulation of electronic structure and d-band center, the NPZFNS@C/NF electrode exhibits extremely high activity for oxygen evolution reaction (OER) and high activity for hydrogen evolution reaction (HER), which shows a very low overpotential of 141 mV at the current density of 10 mA cm−2 for OER and 129 mV for HER respectively in alkaline electrolyte. Furthermore, it also exhibits a small overpotential of 1.5 V for overall water splitting with NPZFNS@C/NF as both anode and cathode, which is lower than most of non-noble metal-based bifunctional electrocatalysts reported. Density functional theory (DFT) results further confirm that the hetero-interface with carbon coating can further optimize Gibbs free energies for both OER and HER processes. This design and constructure strategy provides a new avenue for overall water splitting. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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