Ultrafast H‐Spillover in Intermetallic PtZn Induced by the Local Disorder for Excellent Electrocatalytic Hydrogen Evolution Performance
Ordered intermetallic Platinum-Zinc (PtZn) shows potential in hydrogen evolution reaction (HER), but faces a huge challenge in activity enhancement due to the H-repulsion properties of Zinc (Zn). Here, local disorder in ordered intermetallic PtZn nanoparticles confined in N-doped porous carbon (I-PtZn@NPC) via a confinement-high-temperature pyrolysis strategy is realized to boost the HER performance. Experiments and calculations demonstrate that the local substitution of Pt atoms for Zn atoms creates an ultra-short H-spillover channel (Pt site→Pt-Zn bridge site →Zn site). Benefiting from such an ultra-fast H-migration from Pt site to Zn site, I-PtZn@NPC exhibits enhanced intrinsic activity with an ultralow overpotential (η<sub>10</sub>: 2.3 mV, η<sub>100</sub>: 24 mV) than commercial Pt black catalyst. Furthermore, a 25 cm<sup>2</sup> commercial proton exchange membrane (PEM) electrolyzer equipped with I-PtZn@NPC achieved stable operation at 1.60 V<sub>cell</sub> for 200 h at a current density of 1 A cm⁻<sup>2</sup>. This design of local Zn disorder in the ordered intermetallic PtZn sheds new light on the rational development of efficient Zn-based alloy HER electrocatalysts.
Authors
- Yuanyuan Yan (ORCID: https://orcid.org/0000-0003-0432-5518)
- Shengbo Sang (ORCID: https://orcid.org/0000-0003-3011-7632)
- Jingyun Jiang (ORCID: https://orcid.org/0000-0002-2036-7104)
- Wenwen Shi (ORCID: https://orcid.org/0000-0001-8824-3012)
- Jiadong Zhou (ORCID: https://orcid.org/0000-0001-5268-2136)
- Meiling Wang (ORCID: https://orcid.org/0000-0002-0073-5299)
- Yingjie Hu (ORCID: https://orcid.org/0000-0003-3237-8609)
- Xuguang Liu (ORCID: https://orcid.org/0000-0002-2057-295X)
- Ruizhen Li (ORCID: https://orcid.org/0000-0003-0092-4580)
- Jianhong Lan
- Zhengju Shi
- Longyi Fu
- Zhenyu Liu
Institutions
- Beijing Institute of Technology (CN)
- Zhengzhou University (CN)
- Nanjing Xiaozhuang University (CN)
- Institute of Coal Chemistry (CN)
- Taiyuan University of Technology (CN)
Publication Details
- Journal
- Advanced Materials
- Published
- 2024-11-28
- DOI
- https://doi.org/10.1002/adma.202409575
- Citations
- 34
- Primary Topic
- Electrocatalysts for Energy Conversion
- Type
- article
- Field-Weighted Citation Impact
- 3.48
Funders
- National Natural Science Foundation of China
- Taiyuan University of Technology