富镍磷化物（Ni <sub>12</sub> P <sub>5</sub>）纳米片与氧化多壁碳纳米管的结合以释放氧气,ACS Applied Nano Materials

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富镍磷化物（Ni ₁₂ P ₅）纳米片与氧化多壁碳纳米管的结合以释放氧气
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-11-10 , DOI: 10.1021/acsanm.0c02169
SK Tarik Aziz ₁ , Bibhudatta Malik ₁ , Hari Krishna Sadhanala ₁ , Aharon Gedanken ₁ , Malachi Noked ₁ , Gilbert Daniel Nessim ₁

Affiliation

探索和识别具有可操作活性位点的有效材料以进行电化学氧释放反应（OER），对于诸如电解器和燃料电池之类的能量转换技术的未来至关重要。在这里，我们开发了一种有效的策略，将物理上不同的富金属磷化镍（Ni ₁₂ P ₅）与轻度氧化的多壁碳纳米管（O-MWCNT）耦合，以提高OER的效率。与母体材料Ni ₁₂ P ₅和O-MWCNTs相比，Ni ₁₂ P ₅ -O-MWCNTs性能优于O ₂析出活性。有趣的是，Ni ₁₂ P ₅-O-MWCNT在10 mAcm ^–2的电流密度下显示出280 mV的过电势。Ni ₁₂ P ₅ -O-MWCNTs杂化物凭借异质界面的发展表现出了显着的OER活性，其中Ni ₁₂ P ₅和O-MWCNTs之间的有效相互作用起着至关重要的作用。此外，我们分析了Ni ₁₂ P ₅的XPS和HR-TEM-O-MWCNTs经过OER计时电流法研究后，研究了由于长时间的氧化反应而导致的结构变化。这项OER后的研究使我们能够鉴定O-MWCNT中存在的前催化剂和活性官能团。我们的方法为制造具有协同活性的混合催化体系开辟了一条道路，以促进优化的电催化活性。

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Nickel-Rich Phosphide (Ni12P5) Nanosheets Coupled with Oxidized Multiwalled Carbon Nanotubes for Oxygen Evolution

Exploring and identifying efficient materials with operative active sites for electrochemical oxygen evolution reaction (OER) is of paramount importance for the future of energy conversion technologies like electrolyzers and fuel cells. Herein, we develop an effective strategy to couple physically distinct metal-rich nickel phosphide (Ni₁₂P₅) with mildly oxidized multiwall carbon nanotubes (O-MWCNTs) to boost the efficiency of OER. Ni₁₂P₅-O-MWCNTs outperforms O₂ evolution activity in contrast to the parental materials, Ni₁₂P₅ and O-MWCNTs. Intriguingly, Ni₁₂P₅-O-MWCNTs shows an overpotential of 280 mV achieved at a current density of 10 mAcm^–2. The hybrid, Ni₁₂P₅–O-MWCNTs demonstrates remarkable OER activity by the virtue of development of heterointerfaces in which the effective interaction between Ni₁₂P₅ and O-MWCNTs plays a crucial role. Moreover, we have analyzed the XPS and HR-TEM of Ni₁₂P₅-O-MWCNTs after the chronoamperometry study of OER to examine the structural changes due to the prolonged oxidation reaction. This post OER study enabled us to identify the precatalyst and the active functional groups present in O-MWCNTs. Our approach opens a path for fabricating hybrid catalytic systems with synergetic activity to facilitate optimized electrocatalytic activity.

更新日期：2020-11-25

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