In:
Small, Wiley, Vol. 18, No. 20 ( 2022-05)
Abstract:
Dual‐active‐sites atomically coupled on ultrafine 1D nanowires (NWs) can offer synergic atomic heterojunctions (AHJs) and high atomic‐utilization toward multipurpose and superior catalysis. Here, ≈2‐nm‐thick PtIr/IrO x hybrid NWs are elaborately synthesized with equilibrated Pt/IrO x AHJs as high‐efficiency bifunctional electrocatalysts for overall water splitting. Mechanism studies reveal the atomically coupled Pt–IrO x dual‐sites are favorable for facilitating water dissociation, alleviating the binding of H* on Pt sites and inversely regulating the *OH adsorption and oxidation on bridge Ir–Ir sites. By simply equilibrating the Pt–IrO x ratio, the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) can be substantially accelerated. In particular, Pt‐rich PtIr/IrO x ‐30 NWs attain 11‐fold enhancements for HER compared to Pt/C in 1.0 m KOH, while IrO x ‐rich PtIr/IrO x ‐50 NWs express about five times mass activity referring to Ir/C for OER. Remarkably, the ratio‐optimized PtIr/IrO x NWs electrode couple achieves a durably continuous H 2 production under a substantially low cell voltage.
Type of Medium:
Online Resource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.202201333
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
2168935-0
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