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Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition
Published on: July 26, 2016
Strontium-Induced Lattice Oxygen Activation in Pr-Based Perovskites for High-Efficiency Water Oxidation
Sheng Ma1, Xinze Li2, Taoda Liu1
1School of Materials and New Energy, South China Normal University, Shanwei, 516625, China.
Abstract:
The development of low-cost and high-performance noble-metal-free catalysts for the oxygen evolution reaction (OER) is central to advancing alkaline water electrolysis. This work introduces a novel "composition-thermal history" design strategy, synergistically combining controlled A-site Sr2+ doping with optimized high-temperature sintering (950°C) in Pr-based perovskite. The resulting Pr0.75Sr0.25Ni0.7Co0.3O3 (PSNC-25) exhibits unprecedented nanostructuring and a maximized concentration of oxygen vacancies, unlocking efficient OER via lattice oxygen-mediated mechanism. Sr-induced lattice distortion drastically reduces oxygen vacancy formation energy from 2.06 to 1.14 eV, promoting facile lattice oxygen participation. Thermal engineering stabilizes high-valence Co4+/Ni3+ states and enhances M─O covalency. Electrochemically, PSNC-25 achieves exceptional activity in 1 M KOH: a low overpotential of 389 mV at 10 mA cm-2 and a Tafel slope of 83 mV dec-1, significantly surpassing undoped PrNi0.7Co0.3O3 (η10 > 570 mV). It also exhibits robust durability, by > 120 h chronopotentiometry at 10 mA cm-2 with only ∼45 mV potential drift. This work establishes a rational framework for activating LOM in cost-effective perovskites through dopant-induced electronic modulation and nano-structural control, advancing scalable green hydrogen production.
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