Fe2O3 nanoparticles immobilized on N and S codoped C as an efficient multifunctional catalyst for oxygen reduction reaction and overall water electrolysis |
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Affiliation: | 1. School of Chemistry and Chemical Engineering, Chongqing University, Shazhengjie 174, Chongqing 400044, China;2. School of Chemistry and Environmental Engineering Pingdingshan, University Pingdingshan, 467000, PR China |
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Abstract: | Currently, multifunctional electrocatalysts with superior performance are very vital for developing various clean and regenerated energy systems. Herein, an effective multifunctional electrocatalyst comprising Fe2O3 nanoparticles immobilized on N and S codoped C has been synthesized via heat-treatment of Fe(II) complex at 800 °C (denoted as Fe2O3/NS-C-800). Favorable features including the introduction of maghemite nanoparticles, N/S-codoping effect, and close contact between the Fe2O3 nanoparticles and NS-C ender the Fe2O3/NS-C-800 with high multifunctional catalytic performance. The onset potential (0.97 V) and half-wave potential (0.81 V) of the Fe2O3/NS-C-800 towards oxygen reduction reaction (ORR) are comparable to Pt/C (0.99 and 0.82 V). The Fe2O3/NS-C-800 also exhibits high oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activity with low OER and HER overpotentials of 0.37 and −0.27 V at 10 mA cm−2, respectively. In addition, higher ORR, OER and HER stabilities than Pt/C are observed for the Fe2O3/NS-C-800. More importantly, the assembled water electrolyzer using the Fe2O3/NS-C-800 as the anode and cathode exhibits a high stability at a water electrolysis current density of 10 mA cm−2. The present study offers a new promising non-noble multifunctional catalyst for future application in renewable energy technologies. |
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Keywords: | N and S codoped C Multifunctional catalyst Oxygen reduction reaction Water electrolysis |
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