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Oxygen-Evolution Activity of p-n Heterojunction NiO-SnO2 Ceramic on Ti Substrate Fabricated Using a Simple
Mingzhu Wu1, Ying Li1, Jun Du2
1Chemical Pollution Control Chongqing Applied Technology Extension Center of Higher Vocational Colleges, Chongqing Industry Polytechnic College, Chongqing 401120, P. R. China.
ACS Omega
|September 14, 2020
Summary
This study developed NiO-SnO2 ceramic materials for oxygen-evolution reaction (OER) catalysis. The NSCT-600 material showed excellent OER performance and stability, offering a new pathway for designing advanced electrocatalysts.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- p-n heterojunction NiO-SnO2 ceramics have applications in gas sensors and photoelectrocatalysis.
- Expanding their use to oxygen-evolution reaction (OER) catalysts requires further investigation.
Purpose of the Study:
- To fabricate and evaluate NiO-SnO2 ceramic materials as electrocatalysts for the OER.
- To understand the factors influencing the OER performance and stability of these materials.
Main Methods:
- Layer-by-layer fabrication of NiO-SnO2 ceramics on Ti plates (NSCTs).
- Characterization using SEM, XRD, FT-IR, DRUV-vis, and XPS.
- Electrochemical testing including linear sweep voltammetry, cyclic voltammetry, and chronoamperometry in NaOH solution.
Main Results:
- NSCT-600 exhibited a low overpotential (194 mV at 1 mA/cm2) and good stability after 500 cycles.
- Analysis revealed that the Ni2+/Ni3+ redox cycle, morphology, and crystal faces of NiO and SnO2 are critical for OER performance.
- The NiO-SnO2 ceramic proved to be a stable OER electrocatalyst.
Conclusions:
- NiO-SnO2 ceramics are promising electrocatalysts for the oxygen-evolution reaction.
- The study provides insights into designing high-performance p-n heterojunction metal-oxide ceramic electrocatalysts.
