Harnessing Effective Electric Field Amplification and Intermetallic Hybridization via Nanoelectrode Superlattices to Boost Electrocatalytic Green Hydrogen Production
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Harnessing Effective Electric Field Amplification and Intermetallic Hybridization via Nanoelectrode Superlattices to Boost Electrocatalytic Green Hydrogen Production
Harnessing Effective Electric Field Amplification and Intermetallic Hybridization via Nanoelectrode Superlattices to Boost Electrocatalytic Green Hydrogen Production
Boong, S. K., Chong, C., Raja Mogan, T., Lee, J., Ni, Y., Yu, H., Li, X., & Lee, H. K. (2025). Harnessing Effective Electric Field Amplification and Intermetallic Hybridization via Nanoelectrode Superlattices to Boost Electrocatalytic Green Hydrogen Production. Small, 21(46). Portico. https://doi.org/10.1002/smll.202509227
Abstract:
Electrocatalytic hydrogen evolution reaction (HER) offers a sustainable pathway for green hydrogen production, addressing growing energy demands while reducing fossil fuel dependence. However, existing electrocatalysts face challenges, including low current densities, excessive Pt reliance, and inefficient charge transfer. Here, ampere-level HER catalysis is achieved by introducing 2D nanoelectrode superlattices that boost electrocatalytic efficiency through two key concepts: i) Electric field amplification, where Ag nanoparticles serve as nanoelectrodes and their interparticle interactions within the superlattice are leveraged to concentrate local electric fields for facilitating charge accumulation and transfer. ii) Intermetallic Pt-Ag hybridization, which modulates electronic structure and electron distribution to enhance intrinsic catalytic activity. Notably, Ag hexagonal@Pt achieves the highest performance, delivering −15.88 A cm−2 at −0.9 V vs RHE with 98% Faradaic efficiency and outperforming Ag standing@Pt and Ag disorganized@Pt by up to 8 fold. Moreover, it surpasses Pt/C by ≈934 fold and exhibits ≈4 fold reduction in overpotential at high current densities of ≥500 mA cm−2 compared to other emerging electrocatalysts. Mechanistic studies reveal that optimizing spatial nanoelectrode arrangement is crucial for enhancing HER activity through synergistic electric field concentration and intermetallic hybridization. This work offers critical insights into advancing electrocatalysis for green hydrogen production and broader energy, chemical, and environmental applications.
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Funding Info:
This research / project is supported by the Agency for Science, Technology and Research - Manufacturing, Trade, and Connectivity Individual Research Grant
Grant Reference no. : MTC IRG M23M6c0098
This research / project is supported by the Ministry of Education, Singapore - Academic Research Fund Tier 1
Grant Reference no. : AcRF Tier 1 RG92/24
This research / project is supported by the National University of Singapore - Center of Hydrogen Innovation
Grant Reference no. : CHI-P2022-05
This research / project is supported by the Nanyang Technological University - Start-up grants
Grant Reference no. :
Description:
This is the peer reviewed version of the following article: Boong, S. K., Chong, C., Raja Mogan, T., Lee, J., Ni, Y., Yu, H., Li, X., & Lee, H. K. (2025). Harnessing Effective Electric Field Amplification and Intermetallic Hybridization via Nanoelectrode Superlattices to Boost Electrocatalytic Green Hydrogen Production. Small, 21(46). Portico. https://doi.org/10.1002/smll.202509227
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