cm0c00172_si_001.pdf (1.33 MB)
Promoting Alkaline Hydrogen Evolution Catalysis on P‑Decorated, Ni-Segregated Pt–Ni–P Nanowires via a Synergetic Cascade Route
journal contribution
posted on 2020-04-01, 14:50 authored by Pengtang Wang, Qi Shao, Jun Guo, Lingzheng Bu, Xiaoqing HuangAlthough
both the water dissociation and intermediates’
(H* and OH–) adsorption/desorption are two critical
steps for alkaline hydrogen evolution, very little effort has been
expended to target the latter step to further boost the alkaline hydrogen
evolution catalysis. To overcome this limitation, we designed phosphorus
(P)-modified, nickel (Ni)-segregated platinum (Pt)–Ni nanowires
as highly efficient electrocatalysts for alkaline hydrogen evolution.
The segregated Ni can be evolved into Ni(OH)x as the active site for water splitting. Then, the modified
P with high oxophilicity on the catalyst surface serves as a site
to anchor OH–, largely preventing the competitive
adsorption of OH– and H* on active Pt sites as well
as promoting the adsorption and desorption rate of H*. Consequently,
it achieves excellent activity and stability in 1 M KOH with a current
density as high as 42.5 mA/cm2 (@–0.07 VRHE) and limited overpotential decay after 18 h long-term test, outperforming
most reported alkaline hydrogen evolution reaction electrocatalysts.