A General Strategy for Engineering Single-Metal Sites on 3D Porous N, P Co-Doped Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub> MXene.
basic_science · Level V
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- Record sourced from PubMed, PMID 35187929.
- Also identified by DOI 10.1021/acsnano.1c09841.
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Abstract
Two-dimensional (2D) MXenes have been developed to stabilize single atoms via various methods, such as vacancy reduction and heteroatom-mediated interactions. However, anchoring single atoms on 3D porous MXenes to further increase catalytic active sites and thus construct electrocatalysts with high activity and stability remains unexplored. Here, we reported a general synthetic strategy for engineering single-metal sites on 3D porous N, P codoped Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub> nanosheets. Through a "gelation-and-pyrolysis" process, a series of atomically dispersed metal catalysts (Pt, Ir, Ru, Pd, and Au) supported by N, P codoped Ti<sub>3</sub>C<sub>2</sub>T<sub>X</sub> nanosheets with 3D porous structure can be obtained and serve as efficient catalysts for the electrochemical hydrogen evolution reaction (HER). As a result of the favorable electronic and geometric structure of N(O), P-coordinated metal atoms optimizing catalytic intermediates adsorption and 3D porous structure exposing the active surface sites and facilitating charge/mass transfer, the as-synthesized Pt SA-PNPM catalyst shows ∼20-fold higher activity than the commercial Pt/C catalyst for electrochemical HER over a wide pH range.