Interface engineering of three-phase nickel–cobalt sulfide/nickel phosphide/iron phosphide heterostructure for enhanced water splitting and urea electrolysis,Journal of Colloid and Interface Science

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Interface engineering of three-phase nickel–cobalt sulfide/nickel phosphide/iron phosphide heterostructure for enhanced water splitting and urea electrolysis
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2024-03-19 , DOI: 10.1016/j.jcis.2024.03.109
Longqian Wang ₁ , Pan Wang ₁ , Xin Xue ₁ , Dan Wang ₁ , Huishan Shang ₁ , Yafei Zhao ₁ , Bing Zhang ₁

Affiliation

Rational designing efficient transition metal-based multifunctional electrocatalysts is highly desirable for improving the efficiency of hydrogen production from water cracking. Herein, a self-supported three-phase heterostructure electrocatalyst of nickel–cobalt sulfide/nickel phosphide/iron phosphide (CoNiS-NiP-FeP) was prepared by a two-step gas-phase sulfurization/phosphorization strategy. The heterostructure in CoNiS-NiP-FeP provides a favorable interfacial environment for electron transfer and synergistic interaction of multiphase active components, while the introduced electronegative P/S not only serves as a carrier for proton capture in the hydrogen evolution reaction (HER) process but also promotes the metal-electron outflow, which in turn accelerates the generation of high-valent Ni species to enhance the catalytic activity of oxygen evolution reaction (OER) and urea oxidation reaction (UOR). As expected, CoNiS-NiP-FeP reveals excellent multifunctional electrocatalytic properties. An overpotential of 35/215 mV is required to reach 10 mA cm for HER/OER. More encouragingly, a current of 100 mA cm requires only 1.36 V for UOR with CoNiS-NiP-FeP as anode, which is much lower as compared to the OER (1.50 V). Besides, a two-electrode water/urea electrolyzer assembled based on CoNiS-NiP-FeP has a voltage of only 1.59/1.48 V when the system reaches 50 mA cm. This work provides a new idea for the design of energy-efficient water/urea-assisted water-splitting multifunctional catalysts with multi-component heterostructure synergistic interface engineering.

中文翻译：

用于增强水分解和尿素电解的三相镍钴硫化物/磷化镍/磷化铁异质结构的界面工程

合理设计高效的过渡金属基多功能电催化剂对于提高水裂解制氢效率非常有必要。在此，通过两步气相硫化/磷化策略制备了镍钴硫化物/磷化镍/磷化铁（CoNiS-NiP-FeP）的自支撑三相异质结构电催化剂。 CoNiS-NiP-FeP中的异质结构为电子转移和多相活性组分的协同相互作用提供了有利的界面环境，而引入的负电性P/S不仅可以作为析氢反应（HER）过程中质子捕获的载体，而且还可以作为质子捕获的载体。还促进金属电子流出，进而加速高价镍物种的生成，从而增强析氧反应（OER）和尿素氧化反应（UOR）的催化活性。正如预期的那样，CoNiS-NiP-FeP 显示出优异的多功能电催化性能。 HER/OER 需要 35/215 mV 的过电位才能达到 10 mA cm。更令人鼓舞的是，对于以 CoNiS-NiP-FeP 作为阳极的 UOR，100 mA cm 的电流仅需要 1.36 V，这比 OER (1.50 V) 低得多。此外，基于CoNiS-NiP-FeP组装的双电极水/尿素电解槽，当系统达到50 mA cm时，电压仅为1.59/1.48 V。该工作为多组分异质结构协同界面工程的节能水/尿素辅助水分解多功能催化剂的设计提供了新思路。

更新日期：2024-03-19

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