Cu-Bi Bimetallic Sulfides Loaded on Two-Dimensional Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene for Efficient Electrocatalytic Nitrogen Reduction under Ambient Conditions.
basic_science · Level V
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- Record sourced from PubMed, PMID 39133240.
- Also identified by DOI 10.1021/acs.nanolett.4c02869.
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Abstract
In this paper, Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene/Cu-Bi bimetallic sulfide (Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/BiCuS<sub>2.5</sub>) composites were prepared by a simple <i>in situ</i> deposition method for electrocatalytic nitrogen reduction reaction (eNRR). Compared to Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/Bi<sub>2</sub>S<sub>3</sub> and Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/CuS, the eNRR performance of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/BiCuS<sub>2.5</sub> is significantly improved. The results show that Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/BiCuS<sub>2.5</sub> exhibits a NH<sub>3</sub> yield of 62.57 μg h<sup>-1</sup> mg<sup>-1</sup><sub>cat.</sub> in 0.1 M Na<sub>2</sub>SO<sub>4</sub> at -0.6 V vs reversible hydrogen electrode, and the Faradaic efficiency (FE) reaches 67.69%, which is better than that of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/CuS (NH<sub>3</sub> yield: 52.26 μg h<sup>-1</sup> mg<sup>-1</sup><sub>cat.</sub>, FE: 34.15%) and Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/Bi<sub>2</sub>S<sub>3</sub> (NH<sub>3</sub> yield: 54.04 μg h<sup>-1</sup> mg<sup>-1</sup><sub>cat.</sub>, FE: 37.38%). According to density functional theory calculations, the eNRR at the Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/BiCuS<sub>2.5</sub> surface is the alternating pathway. The <sup>1</sup>H NMR experiment of <sup>15</sup>N proves that the N of NH<sub>3</sub> generated in the experiment originates from N<sub>2</sub> passed during the experiment.