View : 116 Download: 0

NixRh1-x bimetallic alloy nanofibers as a pH-universal electrocatalyst for the hydrogen evolution reaction: the synthetic strategy and fascinating electroactivity

Title
NixRh1-x bimetallic alloy nanofibers as a pH-universal electrocatalyst for the hydrogen evolution reaction: the synthetic strategy and fascinating electroactivity
Authors
Jin, DasolYu, AreumLee, YoungmiKim, Myung HwaLee, Chongmok
Ewha Authors
이종목이영미김명화
SCOPUS Author ID
이종목scopus; 이영미scopus; 김명화scopus
Issue Date
2020
Journal Title
JOURNAL OF MATERIALS CHEMISTRY A
ISSN
2050-7488JCR Link

2050-7496JCR Link
Citation
JOURNAL OF MATERIALS CHEMISTRY A vol. 8, no. 17, pp. 8629 - 8637
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
NixRh1-x alloy nanofibers were synthesized by the thermal reduction of single-phase spinel NiRh2O4 nanofibers under a hydrogen gas flow. First, single-phase NiRh2O4 nanofibers were prepared via calcination preceded by electrospinning. The synthetic conditions including the metal precursor ratio in electrospinning solution and calcination temperature were finely optimized to produce single-phase NiRh2O4. Then, the thermal treatment at a temperature >= 200 degrees C under a H-2 gas flow converted NiRh2O4 to NixRh1-x alloy nanofibers. Their electrocatalytic activity for the hydrogen evolution reaction (HER) was examined with voltammetry in alkaline, neutral and acidic media. NixRh1-x alloy nanofibers showed the lowest overpotentials at -10 mA cm(-2) and the smallest Tafel slopes in all media, indicating a HER activity superior to those of commercial Pt, pure Rh metal, and Rh-/Ni-based electrocatalysts found in the literature. The reason for the superb activity of NixRh1-x alloys is ascribed to the synergistic effect of the facilitated hydrogen adsorption on alloyed Rh and Ni atoms and the enlarged electroactive areas from the porous uneven nanofiber structure. Considering that only a few pH-universal HER catalysts have been reported, NixRh1-x alloy nanofibers, where expensive Rh is diluted with cheap Ni, present excellent feasibility as a practical and cost-effective HER catalyst.
DOI
10.1039/d0ta02005b
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE