Abstract
CoP is a promising catalyst material to replace noble metals in water electrolysis. To further explore the potential of CoP in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), we utilize vertical graphene nanohills (VGNHs) that are known to enhance catalytic performances through superaerophobicity. Unique CoP chrysanthemum-like structures are formed on VGNHs through a facile, one-step electrodeposition reaction. Because of the highly conductive VGNH support and the modified CoP nanostructures, the optimized CoP/VGNHs hybrid catalyst exhibits excellent electrocatalytic activities toward HER in 0.5 M H 2 SO 4 , such as a low overpotential at 10 mA cm -2 (η 10 ) of 51 mV, a small Tafel slope of 36 mV dec -1 , and a long-term stability. Specifically, the overpotential at 100 mA cm -2 (η 100 ) is merely 125 mV, an outstanding performance for a noble metal-free catalyst. Furthermore, the HER performance in 1.0 M KOH (η 10 of 93 mV) and the OER performance in the same alkaline medium (η 10 of 300 mV) are highly competitive, making CoP/VGNHs also an excellent bifunctional electrocatalyst yielding a current density of 10 mA cm -2 at a low voltage of 1.63 V. This novel nanostructure offers an efficient strategy for the development of nonprecious metal catalysts for water electrolysis.
| Original language | English |
|---|---|
| Pages (from-to) | 4625-4630 |
| Number of pages | 6 |
| Journal | ACS Sustainable Chemistry and Engineering |
| Volume | 7 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2019 Mar 4 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Renewable Energy, Sustainability and the Environment
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Chrysanthemum-Like CoP Nanostructures on Vertical Graphene Nanohills as Versatile Electrocatalysts for Water Splitting. / Truong, Linh; Jerng, Sahng Kyoon; Roy, Sanjib Baran; Jeon, Jae Ho; Kim, Kiwoong; Akbar, Kamran; Yi, Yeonjin; Chun, Seung Hyun.
In: ACS Sustainable Chemistry and Engineering, Vol. 7, No. 5, 04.03.2019, p. 4625-4630.Research output: Contribution to journal › Article
TY - JOUR
T1 - Chrysanthemum-Like CoP Nanostructures on Vertical Graphene Nanohills as Versatile Electrocatalysts for Water Splitting
AU - Truong, Linh
AU - Jerng, Sahng Kyoon
AU - Roy, Sanjib Baran
AU - Jeon, Jae Ho
AU - Kim, Kiwoong
AU - Akbar, Kamran
AU - Yi, Yeonjin
AU - Chun, Seung Hyun
PY - 2019/3/4
Y1 - 2019/3/4
N2 - CoP is a promising catalyst material to replace noble metals in water electrolysis. To further explore the potential of CoP in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), we utilize vertical graphene nanohills (VGNHs) that are known to enhance catalytic performances through superaerophobicity. Unique CoP chrysanthemum-like structures are formed on VGNHs through a facile, one-step electrodeposition reaction. Because of the highly conductive VGNH support and the modified CoP nanostructures, the optimized CoP/VGNHs hybrid catalyst exhibits excellent electrocatalytic activities toward HER in 0.5 M H 2 SO 4 , such as a low overpotential at 10 mA cm -2 (η 10 ) of 51 mV, a small Tafel slope of 36 mV dec -1 , and a long-term stability. Specifically, the overpotential at 100 mA cm -2 (η 100 ) is merely 125 mV, an outstanding performance for a noble metal-free catalyst. Furthermore, the HER performance in 1.0 M KOH (η 10 of 93 mV) and the OER performance in the same alkaline medium (η 10 of 300 mV) are highly competitive, making CoP/VGNHs also an excellent bifunctional electrocatalyst yielding a current density of 10 mA cm -2 at a low voltage of 1.63 V. This novel nanostructure offers an efficient strategy for the development of nonprecious metal catalysts for water electrolysis.
AB - CoP is a promising catalyst material to replace noble metals in water electrolysis. To further explore the potential of CoP in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), we utilize vertical graphene nanohills (VGNHs) that are known to enhance catalytic performances through superaerophobicity. Unique CoP chrysanthemum-like structures are formed on VGNHs through a facile, one-step electrodeposition reaction. Because of the highly conductive VGNH support and the modified CoP nanostructures, the optimized CoP/VGNHs hybrid catalyst exhibits excellent electrocatalytic activities toward HER in 0.5 M H 2 SO 4 , such as a low overpotential at 10 mA cm -2 (η 10 ) of 51 mV, a small Tafel slope of 36 mV dec -1 , and a long-term stability. Specifically, the overpotential at 100 mA cm -2 (η 100 ) is merely 125 mV, an outstanding performance for a noble metal-free catalyst. Furthermore, the HER performance in 1.0 M KOH (η 10 of 93 mV) and the OER performance in the same alkaline medium (η 10 of 300 mV) are highly competitive, making CoP/VGNHs also an excellent bifunctional electrocatalyst yielding a current density of 10 mA cm -2 at a low voltage of 1.63 V. This novel nanostructure offers an efficient strategy for the development of nonprecious metal catalysts for water electrolysis.
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U2 - 10.1021/acssuschemeng.8b06508
DO - 10.1021/acssuschemeng.8b06508
M3 - Article
AN - SCOPUS:85061912415
VL - 7
SP - 4625
EP - 4630
JO - ACS Sustainable Chemistry and Engineering
JF - ACS Sustainable Chemistry and Engineering
SN - 2168-0485
IS - 5
ER -