Efficient H<sub>2</sub> Evolution Coupled with Anodic Oxidation of Iodide over Defective Carbon-Supported Single-Atom Mo-N<sub>4</sub> Electrocatalyst.
basic_science · Level V
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- Record sourced from PubMed, PMID 36107720.
- Also identified by DOI 10.1021/acs.nanolett.2c01229.
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Abstract
We successfully prepared nitrogen-doped defective carbon spheres (Mo-N<sub>4</sub>/d-C) with a high loading of 0.996 wt % via a designed vapor-deposition process for IOR-based hydrogen generation. The synthesized Mo-N<sub>4</sub>/d-C catalyst provides a record current density of 10 mA cm<sup>-2</sup> at 0.77 V. Further, the Mo-N<sub>4</sub>/d-C catalyst shows a Tafel slope of 25.58 mV dec<sup>-1</sup>, exceptional stability over time in acidic media, a higher hydrogen generation rate of 0.1063 mL g<sub>cat</sub><sup>-1</sup> min<sup>-1</sup>, a high Faradaic efficiency of 99.8%, and a reduction of the energy consumption up to ∼50% for hydrogen evolution by anodic oxidation reaction of iodide (IOR) compared with the conventional OER-based electrolysis. Computational calculations demonstrate that the Mo-N<sub>4</sub>/d-C structure plays a vital effect on the activity of iodide oxidation, which is competitive with the Pt catalyst.