Citation: Runze He, Chunyan Wang, Ligang Feng. Amorphous FeCoNi-S as efficient bifunctional electrocatalysts for overall water splitting reaction[J]. Chinese Chemical Letters, ;2023, 34(2): 107241. doi: 10.1016/j.cclet.2022.02.046 shu

Amorphous FeCoNi-S as efficient bifunctional electrocatalysts for overall water splitting reaction

School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China

ligang.feng@yzu.edu.cn

Received Date: 20 December 2021
Revised Date: 13 February 2022
Accepted Date: 18 February 2022
Available Online: 21 February 2022

Figures(6)

Developing bifunctional electrocatalysts for overall water splitting reaction is still highly desired but with large challenges. Herein, an amorphous FeCoNi-S electrocatalyst was developed using thioacetamide for the sulfuration of FeCoNi hydroxide during the hydrothermal process. The obtained catalyst exhibited an amorphous structure with hybrid bonds of metal-S bond and metal-O bonds in the catalyst system. The optimized catalyst showed a largely improved bifunctional catalytic ability to drive water splitting reaction in the alkaline electrolyte compared to the FeCoNi hydroxide. It required an overpotential of 280 mV and 80 mV (No-IR correction) to offer 10 mA/cm² for water oxidation and reduction respectively; a low cell voltage of 1.55 V was required to reach 10 mA/cm² for the water electrolysis with good stability for 12 h. Moreover, this catalyst system showed high catalytic stability, catalytic kinetics, and Faraday efficiency for water splitting reactions. Considering the very low intrinsic activity of FeCoNi hydroxide, the efficient bifunctional catalytic ability should result from the newly formed hybrid active sites of metallic metal-S species and the high valence state of metal oxide species. This work is effective in the bifunctional catalytic ability boosting for the transition metal materials by facile sulfuration in the hydrothermal approach.
- Bifunctional electrocatalyst,
- Amorphous,
- Overall water splitting,
- FeCoNi hydroxide,
- Sulfuration
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