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Urchin-like CoP Nanocrystals as Hydrogen Evolution Reaction and Oxygen Reduction Reaction Dual-Electrocatalyst with Superior Stability
Abstract
High-performance electrocatalysts with superior stability are critically important for their practical applications in hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). Herein, we report a facile method to fabricate urchin-like CoP nanocrystals (NCs) as catalyst for both HER and ORR with desirable electrocatalytic activities and long-term stability. The urchin-like CoP NCs with a diameter of 5 μm were successfully prepared by a hydrothermal reaction following a phosphidation treatment in N2 atmosphere and present excellent HER catalytic performance with a low onset overpotential of 50 mV, a small Tafel slope of 46 mV/decade, and an exceptional low overpotential of ~180 mV at a current density of 100 mA cm(-2) with a mass loading density of 0.28 mg/cm(2). Meanwhile, a remarkable ORR catalytic activity was observed with a half-potential of 0.7 V and an onset potential of 0.8 V at 1600 rpm and a scan rate of 5 mV s(-1). More importantly, the urchin-like CoP NCs present superior stability and keep their catalytic activity for at least 10 000 CV cycles for HER in 0.5 M H2SO4 and over 30 000 s for ORR in 0.1 M KOH, which is ascribed to their robust three-dimensional structure. This urchin-like CoP NCs might be a promising replacement to the Pt-based electrocatalysts in water splitting and fuel cells.
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Metadata
- Authors
- Yang, H., Zhang, Y., Hu, F., & Wang, Q.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-10-22
- Volume
- 15
- Issue
- 11
- Pages
- 7616-7620
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2339734334
- Cited by
- 449
- References
- 14
- FWCI
- 18.77
- Type
- journal article
- Language
- en
- Open access
- closed
- Funders
- National Natural Science Foundation of China (21303249, 21425103, 21501192, 81401464)
- Natural Science Foundation of Jiangsu Province (BK2012007, SBK201341397)
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- Yang, H., Zhang, Y., Hu, F., & Wang, Q. (2015). Urchin-like CoP Nanocrystals as Hydrogen Evolution Reaction and Oxygen Reduction Reaction Dual-Electrocatalyst with Superior Stability. Nano Letters. https://doi.org/10.1021/acs.nanolett.5b03446
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