Abstract
The identification and development of efficient catalysts made of non-precious materials for oxygen reduction reaction (ORR) are essential for the successful operation of a wide range of energy devices. This study provides evidence that earth-abundant nanoparticles of transition metals encapsulated in a nitrogen-doped carbon shell (M@N-C, M=Fe, Co, Ni, Cu or Fe alloys) are promising catalysts in acidic solutions. By density functional theory calculations and experimental validations, we quantitatively propose a method of tuning the ORR activity of M@N-C by controlling the nitrogen-doping level, the thickness of the N-C shells and binary alloying. FeCo@N-C/KB was chosen as the best ORR catalyst because of its onset and half-wave potentials of 0.92 and 0.74 V vs a reversible hydrogen electrode (RHE), respectively, and its excellent durability. Furthermore, FeCo@N-C/KB possesses a high activity for the hydrogen evolution reaction (HER; - 0.24 V vs RHE at - 10 mA cm- 2), thus demonstrating that it is a good bi-functional ORR and HER catalyst in acidic media.
| Original language | English |
|---|---|
| Article number | e233 |
| Journal | NPG Asia Materials |
| Volume | 8 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2016 Sep 23 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Modelling and Simulation
- Materials Science(all)
- Condensed Matter Physics
Cite this
}
Towards a comprehensive understanding of FeCo coated with N-doped carbon as a stable bi-functional catalyst in acidic media. / Noh, Seung Hyo; Seo, Min Ho; Kang, Joonhee; Okajima, Takeyoshi; Han, Byungchan; Ohsaka, Takeo.
In: NPG Asia Materials, Vol. 8, No. 9, e233, 23.09.2016.Research output: Contribution to journal › Article
TY - JOUR
T1 - Towards a comprehensive understanding of FeCo coated with N-doped carbon as a stable bi-functional catalyst in acidic media
AU - Noh, Seung Hyo
AU - Seo, Min Ho
AU - Kang, Joonhee
AU - Okajima, Takeyoshi
AU - Han, Byungchan
AU - Ohsaka, Takeo
PY - 2016/9/23
Y1 - 2016/9/23
N2 - The identification and development of efficient catalysts made of non-precious materials for oxygen reduction reaction (ORR) are essential for the successful operation of a wide range of energy devices. This study provides evidence that earth-abundant nanoparticles of transition metals encapsulated in a nitrogen-doped carbon shell (M@N-C, M=Fe, Co, Ni, Cu or Fe alloys) are promising catalysts in acidic solutions. By density functional theory calculations and experimental validations, we quantitatively propose a method of tuning the ORR activity of M@N-C by controlling the nitrogen-doping level, the thickness of the N-C shells and binary alloying. FeCo@N-C/KB was chosen as the best ORR catalyst because of its onset and half-wave potentials of 0.92 and 0.74 V vs a reversible hydrogen electrode (RHE), respectively, and its excellent durability. Furthermore, FeCo@N-C/KB possesses a high activity for the hydrogen evolution reaction (HER; - 0.24 V vs RHE at - 10 mA cm- 2), thus demonstrating that it is a good bi-functional ORR and HER catalyst in acidic media.
AB - The identification and development of efficient catalysts made of non-precious materials for oxygen reduction reaction (ORR) are essential for the successful operation of a wide range of energy devices. This study provides evidence that earth-abundant nanoparticles of transition metals encapsulated in a nitrogen-doped carbon shell (M@N-C, M=Fe, Co, Ni, Cu or Fe alloys) are promising catalysts in acidic solutions. By density functional theory calculations and experimental validations, we quantitatively propose a method of tuning the ORR activity of M@N-C by controlling the nitrogen-doping level, the thickness of the N-C shells and binary alloying. FeCo@N-C/KB was chosen as the best ORR catalyst because of its onset and half-wave potentials of 0.92 and 0.74 V vs a reversible hydrogen electrode (RHE), respectively, and its excellent durability. Furthermore, FeCo@N-C/KB possesses a high activity for the hydrogen evolution reaction (HER; - 0.24 V vs RHE at - 10 mA cm- 2), thus demonstrating that it is a good bi-functional ORR and HER catalyst in acidic media.
UR - http://www.scopus.com/inward/record.url?scp=85010643915&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85010643915&partnerID=8YFLogxK
U2 - 10.1038/am.2016.142
DO - 10.1038/am.2016.142
M3 - Article
AN - SCOPUS:85010643915
VL - 8
JO - NPG Asia Materials
JF - NPG Asia Materials
SN - 1884-4049
IS - 9
M1 - e233
ER -