期刊
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
卷 343, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2023.123470
关键词
Carbon nanotube; Nanostructures; Integrated tri-functional heterostructure; In -situ catalytic growth; Water splitting
In this study, a hierarchical integrated electrode with tri-functional heterostructure was developed for efficient hydrogen production and urea-containing wastewater purification. The electrode exhibited abundant active intermediates, rapid bubbles release, and expanded accessible surface area.
Construction of durable multi-function electrocatalysts for hydrogen production is still highly challenging. Herein, we report a hierarchical integrated tri-functional heterogeneous CNTs/MoC/CoNiMo electrode for HER and related OER/UOR. The carbon-protected Ni nanoparticles yield abundant gamma-NiOOH active intermediates to boost OER/UOR, while DFT calculations verify Mo migration induced by MoC and CoNiMo alloy under negative potentials generates HER super-active sites on Mo-rich surfaces. Additionally, the parallel aligned nanosheets with out-plane extended CNTs arrays can guide the rapid bubbles release and expand the accessible surface area. Therefore, the optimized CNT/MoC/NMC-3 electrode can achieve overpotentials of 51 mV (HER) and 226 mV (OER), with low potential threshold of 1.257 V (UOR) at 10 mA cm-2. Moreover, the assembled symmetric urea electrolyzer reaches a 1.291 V cell voltage at 10 mA cm-2. This work provides a novel strategy for heterostructure multi-component integration for achieving high-efficiency hydrogen production and urea-containing wastewater purification.
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