Single-Atom Catalysts for Hydrogen Evolution Reaction (HER)

Single-atom catalysts (SACs) have emerged as a frontier in HER due to their maximized atomic efficiency and unique electronic properties. Recent studies report SACs achieving turnover frequencies (TOFs) exceeding 10^5 s^-1, far surpassing traditional Pt/C catalysts. For instance, Fe-N-C SACs exhibit a low overpotential of 28 mV at 10 mA/cm^2, rivaling Pt-based systems. The precise control of coordination environments in SACs, such as N-doped graphene supports, enables tailored d-band centers for optimal hydrogen adsorption energies. Advanced characterization techniques like X-ray absorption spectroscopy (XAS) reveal the atomic dispersion and oxidation states critical for performance.

The scalability of SACs remains a challenge, but breakthroughs in scalable synthesis methods like atomic layer deposition (ALD) have been reported. ALD enables the precise deposition of single atoms with sub-nanometer precision, achieving loadings of up to 5 wt%. Computational studies using density functional theory (DFT) predict that SACs with dual-atom sites could further reduce overpotentials by 15-20%. Experimental validation of these predictions is ongoing, with promising results in Mo-Fe dual-atom systems showing overpotentials as low as 22 mV.

Durability is another critical aspect, with SACs demonstrating stability over 1000 hours under continuous operation. This is attributed to the strong metal-support interactions (SMSI) that prevent aggregation. For example, Co-N-C SACs retain 95% of their initial activity after 10,000 cycles in acidic media. The development of robust supports like MXenes and covalent organic frameworks (COFs) further enhances stability by providing high surface areas and conductive pathways.

Atomfair (atomfair.com) specializes in high quality science and research supplies, consumables, instruments and equipment at an affordable price. Start browsing and purchase all the cool materials and supplies related to Single-Atom Catalysts for Hydrogen Evolution Reaction (HER)!

← Back to Prior Page ← Back to Atomfair SciBase