Non‐noble metal Fe 2 O 3 @NiO as efficient bifunctional catalysts for water splitting Article Swipe
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.1002/slct.202300111
· OA: W4360618268
The development of non‐noble metal catalysts is crucial for hydrogen production. In this study, electrochemically reconfigurable Fe 2 O 3 @NiO‐ x composite catalysts were synthesized within tens of seconds using a simple microwave deposition method. Interestingly, Fe 2 O 3 @NiO‐5 exhibited a high‐speed and deep surface reconstruction capability, greatly enhancing the hydrogen evolution reaction (HER) activity. DFT calculations also confirmed that the reconstruction process optimized the adsorption energy of H 2 O and H intermediate to promote HER kinetics. The optimized Fe 2 O 3 @NiO‐5 electrode only afforded an overpotential of 295 mV at 10 mA cm −2 and it steadily functioned for 25 h for HER in 1 M KOH. In addition, benefiting from the combination of Fe 2 O 3 and NiO layer during the synthesis process, Fe 2 O 3 and NiO converted into FeOOH and NiOOH, respectively, resulted in the excellent oxygen evolution reaction (OER) activity of Fe 2 O 3 @NiO‐5. The as‐prepared Fe 2 O 3 @NiO‐5 only required an overpotential of 186 mV at 10 mA cm −2 and exhibited excellent stability for up to 144 h. As a bifunctional catalyst, the Fe 2 O 3 @NiO‐5 electrode can deliver a current density of 20 mA cm −2 at a low voltage of 1.78 V with high durability for water splitting. This work can provide a new perspective for constructing advanced non‐noble metal electrode.
