Synergistically Coupling of Manganese-Doped CoP Nanowires Arrays with Highly Dispersed Ni(PO3)2 Nanoclusters toward Efficient Overall Water Splitting
Document Type
Article
Publication Date
9-5-2022
Abstract
Co-based phosphides are considered to be highly promising electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). However, their electrocatalytic efficiencies are greatly limited by the weak water dissociation process and unsatisfactory adsorption ability toward reaction intermediates. Herein, novel Mn-doped CoP/Ni(PO3)2heterostructure array electrocatalysts which are composed of highly dispersed Ni(PO3)2nanoclusters that are tightly wrapped on Mn-doped CoP nanowire arrays are designed. An electrocatalytic performance test suggested that the heterostructure arrays exhibited competitive electrocatalytic performance toward both HER and OER, which needed overpotentials of 116 and 245 mV to drive a current of 10 mA/cm2, respectively. Encouragingly, a symmetric two electrode water splitting system constructed by the heterostructure arrays required an ultralow cell voltage, suggesting the potential in overall water splitting. First-principles calculations combined with experimental characterization were further performed to clarify the electrocatalytic mechanism. On the one hand, effective doping of Mn atoms could optimize the surface electronic structure of CoP and promote the intrinsic activity. On the other hand, the compact and abundant heterogeneous interface between Ni(PO3)2and CoP not only made more active sites exposed but also promoted the effective adsorption of intermediate reaction species on the catalyst surface. This work provides a new strategy to improve electrocatalytic performance of Co-based phosphides through the synergistic coupling of metal-doping and phosphate surface decoration, which will greatly promote the development of highly efficient electrocatalysts for overall water splitting.
Identifier
85137162555 (Scopus)
Publication Title
Inorganic Chemistry
External Full Text Location
https://doi.org/10.1021/acs.inorgchem.2c02561
e-ISSN
1520510X
ISSN
00201669
PubMed ID
36007160
First Page
14201
Last Page
14210
Issue
35
Volume
61
Grant
20204BCJ23004
Fund Ref
National Natural Science Foundation of China
Recommended Citation
Liu, Yuan; Gong, Wufei; Yao, Shenman; Liang, Yan; Yang, Yanxing; Yu, Ting; Yuan, Cailei; and Yang, Yong, "Synergistically Coupling of Manganese-Doped CoP Nanowires Arrays with Highly Dispersed Ni(PO3)2 Nanoclusters toward Efficient Overall Water Splitting" (2022). Faculty Publications. 2663.
https://digitalcommons.njit.edu/fac_pubs/2663
