Journal
NANO RESEARCH
Volume 10, Issue 5, Pages 1732-1739Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1437-2
Keywords
layered double hydroxide; oxygen evolution reaction; phosphate; phosphite; hypophosphite
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Funding
- National Natural Science Foundation of China
- National Key Research and Development Program of China [2016YFC0801302, 2016YFF0204402]
- Program for Changjiang Scholars and Innovative Research Team in the University
- Fundamental Research Funds for the Central Universities
- Ministry of Finance
- Ministry of Education of PRC
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Rational design and controlled fabrication of efficient and cost-effective electrodes for the oxygen evolution reaction (OER) are critical for addressing the unprecedented energy crisis. Nickel-iron layered double hydroxides (NiFe-LDHs) with specific interlayer anions (i.e. phosphate, phosphite, and hypophosphite) were fabricated by a co-precipitation method and investigated as oxygen evolution electrocatalysts. Intercalation of the phosphorus oxoanion enhanced the OER activity in an alkaline solution; the optimal performance (i.e., a low onset potential of 215 mV, a small Tafel slope of 37.7 mV/dec, and stable electrochemical behavior) was achieved with the hypophosphite-intercalated NiFe-LDH catalyst, demonstrating dramatic enhancement over the traditional carbonate-intercalated NiFe-LDH in terms of activity and durability. This enhanced performance is attributed to the interaction between the intercalated phosphorous oxoanions and the edge-sharing MO6 (M = Ni, Fe) layers, which modifies the surface electronic structure of the Ni sites. This concept should be inspiring for the design of more effective LDH-based oxygen evolution electrocatalysts.
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