Mn‐Doped Nickel Telluride Dirac Semimetals with Engineered Dirac Cones for Accelerated Energy Conversion: Synergistic Electron Transfer and Adsorption Optimization

Why It Matters

The study proves that electronic‑structure engineering of Dirac semimetals can unlock superior catalytic activity, accelerating the deployment of efficient renewable‑energy technologies.

Key Takeaways

• 5% Mn doping maximizes Dirac cone velocity.
• Fermi level DOS rises, enhancing charge transfer.
• Power conversion efficiency reaches 9.12% as counter electrode.
• HER overpotential drops to 110 mV at 10 mA cm⁻².
• Simple hydrothermal synthesis enables scalable catalyst production.

Pulse Analysis

Dirac semimetals have attracted attention beyond condensed‑matter physics because their linear band dispersion yields exceptionally high carrier mobility and tunable surface states. In catalysis, these attributes translate into rapid electron delivery to reactive sites, a prerequisite for efficient electrochemical reactions. By leveraging the topological nature of NiTe2, researchers can exploit its intrinsic Dirac cones as a platform for further electronic tailoring, positioning these materials as a new class of quantum‑enhanced catalysts.

Introducing manganese into the NiTe2 lattice perturbs the Dirac cone, shifting it closer to the Fermi level and increasing the Fermi velocity, as confirmed by density‑functional theory calculations. The 5% Mn composition also amplifies the density of states at the Fermi edge, which improves adsorption of triiodide ions and protons, thereby reducing kinetic barriers for both the triiodide reduction reaction and the hydrogen evolution reaction. Experimental validation shows a record‑setting 9.12% power conversion efficiency for a dye‑sensitized solar cell counter electrode and an HER overpotential of just 110 mV at 10 mA cm⁻², outperforming many conventional noble‑metal catalysts.

The broader implication is a scalable pathway to convert topological quantum materials into practical energy‑conversion components. The hydrothermal synthesis is low‑cost and amenable to large‑area production, suggesting that commercial adoption of Mn‑doped Dirac semimetal catalysts could accelerate the rollout of high‑efficiency solar cells and green hydrogen generators. Future research will likely explore other dopants, heterostructures, and device architectures to further harness the synergy between electronic topology and catalytic function.