Thin NiFeCr-LDHs nanosheets promoted by g-C3N4: a highly active electrocatalyst for oxygen evolution reaction
- 23 August 2019
- journal article
- research article
- Published by IOP Publishing in Nanotechnology
- Vol. 30 (49), 494001
- https://doi.org/10.1088/1361-6528/ab3e28
Abstract
NiFeCr layered double hydroxides (NiFeCr-LDHs) supported on graphitic carbon nitride (g-C3N4) hybrids (NiFeCr-LDHs/g-C3N4) are synthesized and used as an electrocatalyst for oxygen evolution reaction (OER) in alkaline media. Effect of g-C3N4 on the structure and OER performance of NiFeCr-LDHs are investigated in detail. g-C3N4 can promote the formation of thin NiFeCr-LDHs nanosheets, thereby enhancing both the number of active sites and OER activity. X-ray photoelectron spectra measurements confirm the electronic interaction between g-C3N4 and NiFeCr-LDHs nanosheets. The OER performance of NiFeCr-LDHs/g-C3N4 hybrids highly relates to the weight ratio of g-C3N4 to NiFeCr-LDHs. When the weight ratio of g-C3N4 to NiFeCr-LDHs is 5%, the corresponding electrocatalyst shows the best OER activity. The component optimized NiFeCr-LDHs/g-C3N4 hybrids display the overpotential of ~223 mV at 10 mA cm-2 and Tafel slope of 89 mV dec−1 for OER in 1 M KOH solution, which is better than that of pristine NiFeCr-LDHs, bare g-C3N4, and commercial RuO2.Keywords
Funding Information
- Fundamental Research Funds for the Central Universities (GK201901002)
- 111 Project (B14041)
- Major Research Plan of the National Natural Science Foundation of China (Program No. 91545130)
- Science and Technology Program in Shaanxi Province of China (Program No. 2019GY-165)
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