Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 653, Issue -, Pages 627-633Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.09.107
Keywords
Hydroxides; Crystal -amorphous heterostructures; Electrocatalysis; Oxygen evolution reaction; Nanosheets
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The formation of crystal-amorphous interfaces is a promising strategy for enhancing the oxygen evolution reaction (OER). This study presents a method to control the crystallinity of catalysts through recrystallization growth at room temperature. The resulting heterogeneous interfaces significantly improve the OER activity of the catalysts while maintaining structural stability.
The formation of crystal-amorphous (c-a) interfaces by modulating the crystallinity of the material is a promising strategy for the oxygen evolution reaction (OER). Herein, a recrystallization growth at room temperature to regulate the crystallinity of catalysts is reported. The MoFeNi hydroxide precursor was synthesized by the sol-vothermal method, and then the crystallinity of the material was controlled by adjusting the concentration of Na2S in the immersion solution. These c-a heterogeneous interfaces significantly improved the OER activity of the catalysts while ensuring structural stability. The best catalyst exhibited a low overpotential of 195 mV to reach 10 mA cm-2 in 1 M KOH. It also showed good stability, operating stably at high current densities for 96 h without significant degradation. In addition, the anode of the two-electrode water splitting electrolyzer required only 1.46 V to reach 10 mA cm-2 and operated for a long time without significant degradation. This method will provide new insights and perspectives for developing efficient and stable OER catalysts.
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