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Published on: December 6, 2021
Controlled Urothermal Synthesis of NH4Fe2S3: An Electrocatalyst for the Oxygen Evolution Reaction
Xingang Kong1, Yanghong Jiang1, Guoyu Ren1
1School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Abstract:
NH4Fe2S3 was previously only identified in industrial corrosion deposits; however, there is no report on its controllable synthesis and performance so far. In this study, NH4Fe2S3 is synthesized by the urothermal method in the system of iron powder, thiourea, and lithium hydroxide monohydrate. The product shows fiber-like morphology (≈20 μm length, 200 nm width) and a layered structure of [FeS4] tetrahedral double chains with interlayer NH4+. The electrocatalytic performance toward the oxygen evolution reaction (OER) is evaluated. NH4Fe2S3 undergoes structural reconstruction in KOH electrolyte, with K+ intercalating into the interlayer spaces. This reconstruction material exhibits outstanding OER performance in a 1 mol L-1 KOH electrolyte, requiring an overpotential of only 277 mV to reach a current density of 10 mA cm-2 and displaying a low Tafel slope of 69.37 mV dec-1. Furthermore, the catalytic activity shows no significant decay after continuous operation for 200 h.
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