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Oxygen-Evolution Activity of p-n Heterojunction NiO-SnO2 Ceramic on Ti Substrate Fabricated Using a Simple Layer-by-Layer Method.

Authors
  • Wu, Mingzhu1
  • Li, Ying1
  • Du, Jun2
  • Tao, Changyuan2
  • Liu, Zuohua2
  • 1 Chemical Pollution Control Chongqing Applied Technology Extension Center of Higher Vocational Colleges, Chongqing Industry Polytechnic College, Chongqing 401120, P. R. China. , (China)
  • 2 Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P. R. China. , (China)
Type
Published Article
Journal
ACS Omega
Publisher
American Chemical Society (ACS)
Publication Date
Sep 08, 2020
Volume
5
Issue
35
Pages
22652–22660
Identifiers
DOI: 10.1021/acsomega.0c03435
PMID: 32923825
Source
Medline
Language
English
License
Unknown

Abstract

To expand the application of p-n heterojunction NiO-SnO2 ceramic materials from gas sensors and photoelectrocatalysts to oxygen-evolution reaction (OER) catalysts, we fabricated two NiO-SnO2 ceramics on a Ti plate (NSCTs) using a simple layer-by-layer method. The prepared NSCTs (NSCT-480 and NSCT-600) were characterized and analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), diffuse reflectance ultraviolet-visible spectroscopy (DRUV-vis), and X-ray photoelectron spectroscopy (XPS). The OER activity and stability were measured by linear sweep voltammetry, cyclic voltammetry, chronoamperometry, amperometric i-t curve, and chronopotentiometry in a 1.0 mol/L NaOH solution at normal temperature and pressure. After 500 cycles, the lower overpotential (η = 194 mV at 1 mA/cm2) indicated that NSCT-600 offered adequate performance as an OER electrocatalyst. Moreover, the changes observed with cyclic voltammetry, SEM, XRD, and XPS during the OER test revealed that the redox cycle of Ni2+/Ni3+, morphology, and crystal faces of NiO and SnO2 were three critical factors. The data proved that the NiO-SnO2 ceramic is a stable OER electrocatalyst. The results of this study will provide a guide for the design and fabrication of p-n heterojunction metal-oxide ceramic electrocatalysts with a high OER performance. Copyright © 2020 American Chemical Society.

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