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Ni 1−x M x Se 2 (M = Fe, Co, Cu) nanowires as anodes for ammonia-borane electrooxidation and the derived Ni 1−x M x Se 2−y –OOH ultrathin nanosheets as efficient electrocatalysts for oxygen evolution
Exploitation of advanced cost-effective electrocatalysts (ECs) is highly desirable for devices engaged in the production of clean energies, such as fuel cells and water electrolyzers. Herein, a series of nickel-based bimetallic selenide, Ni 1−x M x Se 2 (M = Fe, Co, Cu), nanowires (NWs) grown on car...
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| Published in: | Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019-07, Vol.7 (27), p.16372-16386 |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | Exploitation of advanced cost-effective electrocatalysts (ECs) is highly desirable for devices engaged in the production of clean energies, such as fuel cells and water electrolyzers. Herein, a series of nickel-based bimetallic selenide, Ni
1−x
M
x
Se
2
(M = Fe, Co, Cu), nanowires (NWs) grown on carbon fiber paper (CFP) were first synthesized by a general approach, selenizing the corresponding bimetallic oxide NW precursor on CFP, and utilized as anodes for the ammonia-borane (AB) electrooxidation reaction (AOR) in 0.1 M KOH. These nominal Ni
1−x
M
x
Se
2
anodes exhibit dramatically M-dependent catalytic activities towards the AOR and the electrocatalytic activity follows the order Ni
1−x
Cu
x
Se
2
> Ni
1−x
Fe
x
Se
2
> Ni
1−x
Co
x
Se
2
. In particular, the catalytic activity of the Ni
1−x
Cu
x
Se
2
is exceptionally high, surpassing most of the previously reported ECs for the AOR. The follow-up investigations unveil that the Ni
1−x
M
x
Se
2
NWs on CFP have been converted into ultrathin, porous Ni
1−x
M
x
Se
2−y
–OOH nanosheets (NSs) after the AOR, which presents a unique electrochemical strategy for the synthesis of novel ultrathin bimetallic selenide–oxyhydroxide NSs. Moreover, it is demonstrated that the Ni
1−x
M
x
Se
2−y
–OOH NS anodes exhibit much higher catalytic activities toward the oxygen evolution reaction (OER) than the pristine Ni
1−x
M
x
Se
2
NW anodes because of the advanced architectures rendering larger electrochemical accessible surface areas (ECSAs) and a modified electronic structure. This work provides a new perspective for design and exploration of highly efficient and durable nonprecious-metal-based ECs for clean energy conversion devices. |
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| ISSN: | 2050-7488 2050-7496 |
| DOI: | 10.1039/C9TA04681J |