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FeOOH-enhanced Baifunctionality in Ni3N Nanotube Arrays for Water Splitting
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2020-01-20 , DOI: 10.1016/j.apcatb.2020.118600
Jielun Guan , Chengfei Li , Jiawei Zhao , Yanzhang Yang , Wen Zhou , Yi Wang , Gao-Ren Li

Here we report the functional FeOOH as a cocatalyst to enhance excellent bifunctionality of the Ni3N catalyst, which demonstrate remarkable electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reduction (OER) compared to the pristine Ni3N sample. Experimental data and theoretical calcinations demonstrate that the FeOOH facilitates surface adsorption and cleavage of OH/H2O species and decrease the d-band center of active Ni species for optimizing the Gibbs free energy of intermediates. Furthermore, relatively vertical Ni3N nanotubes can promote the mass transport and electrons transfer as a main catalyst. The unusual synergistic effect in hybrid system with high density of heterointerface is contributed to the improvement of HER/OER catalytic performance. Specifically, the obtained FeOOH/Ni3N hybrid catalysts display excellent OER/HER performance with an overpotential of 244 mV/67 mV at 10 mA cm-2 in 1.0 M KOH, along with an applied potential of 1.56 V to boost overall water splitting at 10 mA cm−2. This simple and effective strategy may provide a new path to design the bifunctional catalysts and improve the catalytic performance for water splitting.



中文翻译:

Ni 3 N纳米管阵列中FeOOH增强的Ba官能度用于水分解

在这里,我们报告了功能性FeOOH作为助催化剂,可增强Ni 3 N催化剂的优异双功能性,与原始Ni 3 N样品相比,它表现出了显着的氢释放反应(HER)和氧释放减少(OER)电催化活性。实验数据和理论煅烧证明的FeOOH便于OH的表面吸附和裂解- / H 2 O类物质,降低活性的Ni物种的d带中心用于优化中间体的吉布斯自由能。此外,相对垂直的Ni 3N纳米管可以作为主要催化剂,促进质量传输和电子转移。在具有高异质界面密度的混合系统中,不同寻常的协同作用有助于提高HER / OER的催化性能。具体而言,所获得的FeOOH / Ni 3 N杂化催化剂表现出优异的OER / HER性能,在1.0 M KOH中的10 mA cm -2下的过电势为244 mV / 67 mV,并且施加的电势为1.56V。在10 mA cm -2。这种简单有效的策略可能为设计双功能催化剂和改善水分解的催化性能提供一条新途径。

更新日期:2020-01-21
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