Ni4Mo/MoO2 多相纳米棒三功能电催化剂高效自供电全分解水,Small Methods

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Ni4Mo/MoO2 多相纳米棒三功能电催化剂高效自供电全分解水
Small Methods ( IF 10.7 ) Pub Date : 2023-04-24 , DOI: 10.1002/smtd.202201659
Ran Xiao _{1,

2} , Fenfen Wang ₁ , Li Luo ₂ , Xincheng Yao ₂ , Yongchao Huang ₃ , Zhongmin Wang ₄ , M-Sadeeq Balogun ₂

Affiliation

探索对能量存储和转换系统具有高活性的具有成本效益的多功能电极，例如自供电碱性水电解，是非常有意义的，尽管研究仍然非常有限。在此，首次制备了异质镍钼 (NiMo) 基电极作为不对称超级电容器 (ASC)、析氢反应和析氧反应的三功能电极。三功能电极由Ni ₄ Mo和MoO ₂ (表示为Ni ₄ Mo/MoO ₂) 具有分层纳米棒异质结构和丰富的异质纳米界面，可创造足够的活性位点和有效的电荷转移，以实现高性能的自供电电化学装置。ASC 由制备的 Ni ₄ Mo/MoO _{2正极组成，显示出 1.6 V 的宽电位窗口和 115.6 Wh kg}^-1的最大能量密度，而碱性全水分解 (OWS) 组装使用作为双功能催化剂制备的 Ni ₄ Mo/MoO ₂仅需要 1.48 V 的低电池电压即可在含水碱性电解质中实现 10 mA cm ^-2的电流密度。最后，通过整合 Ni ₄ Mo/MoO ₂基于 ASC 和 OWS 设备，组装了一种水性自供电 OWS，该 OWS 自供电以产生氢气和氧气，验证了所制备的 Ni 4 Mo/MoO 2 在可持续和可再生能源存储_方面的_巨大潜力和转换系统。

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Efficient Self-Powered Overall Water Splitting by Ni4Mo/MoO2 Heterogeneous Nanorods Trifunctional Electrocatalysts

The exploration of cost-effective multifunctional electrodes with high activity toward energy storage and conversion systems, such as self-powered alkaline water electrolysis, is very meaningful, although studies remain quite limited. Herein, a heterogeneous nickel-molybdenum (NiMo)-based electrode is fabricated for the first time as a trifunctional electrode for asymmetric supercapacitor (ASC), hydrogen evolution reaction, and oxygen evolution reaction. The trifunctional electrode consists of Ni₄Mo and MoO₂ (denoted Ni₄Mo/MoO₂) with hierarchical nanorod heterostructure and abundant heterogeneous nanointerfaces creating sufficient active sites and efficient charge transfer for achieving high performance self-power electrochemical devices. The ASC consists of the as-prepared Ni₄Mo/MoO₂ positive electrode, showing a broad potential window of 1.6 V, and a maximum energy density of 115.6 Wh kg⁻¹, while the alkaline overall water splitting (OWS) assembled using the as-prepared Ni₄Mo/MoO₂ as bifunctional catalysts only requires a low cell voltage of 1.48 V to achieve a current density of 10 mA cm⁻² in aqueous alkaline electrolyte. Finally, by integrating the Ni₄Mo/MoO₂-based ASC and OWS devices, an aqueous self-powered OWS is assembled, which self-power the OWS to generate hydrogen gas and oxygen gas, verifying great potential of the as-prepared Ni₄Mo/MoO₂ for sustainable and renewable energy storage and conversion system.

更新日期：2023-04-24

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