Journal
ACS NANO
Volume 12, Issue 1, Pages 158-167Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b04646
Keywords
Fe-Co-P alloy; self-assembly; hollow sphere; XANES; EXAFS; oxygen evolution reaction
Categories
Funding
- National Science Foundation (NSF) through NSF-CBET [1505943, 1336057]
- ACS Petroleum Research Fund (PRF) [53560-DNI 10]
- Ohio Federal Network Research (OFRN) of the Center of Excellence
- U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Department of Energy
- National Science Foundation [EEC-1647722]
- MRCAT
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1505943] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1336057] Funding Source: National Science Foundation
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Oxygen evolution reaction (OER) is a pivotal process in many energy conversion and storage techniques, such as water splitting, regenerative fuel cells, and rechargeable metal-air batteries. The synthesis of stable, efficient, non-noble metal-based electrocatalysts for OER has been a long-standing challenge. In this work, a facile and scalable method to synthesize hollow and conductive iron-cobalt phosphide (Fe-Co-P) alloy nanostructures using an Fe-Co metal organic complex as a precursor is described. The Fe-Co-P alloy exhibits excellent OER activity with a specific current density of 10 mA/cm(2) being achieved at an overpotential as low as 252 mV. The current density at 1.5 V (vs reversible hydrogen electrode) of the Fe-Co-P catalyst is 30.7 mA/cm(2), which is more than 3 orders of magnitude greater than that obtained with state-of-the-art Fe-Co oxide catalysts. Our mechanistic experiments and theoretical analysis suggest that the electrochemical-induced high-valent iron stabilizes the cobalt in a low-valent state, leading to the simultaneous enhancement of activity and stability of the OER catalyst.
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