层状TiO2纳米片负载的NiCo2O4纳米颗粒作为双功能电催化剂，可用于总水分解,ChemElectroChem

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层状TiO2纳米片负载的NiCo2O4纳米颗粒作为双功能电催化剂，可用于总水分解
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-10-19 , DOI: 10.1002/celc.201801107
Raji Vadakkekara ₁ , Rajith Illathvalappil _{1,

2} , Sreekumar Kurungot _{1,

2}

Affiliation

探索从低成本过渡金属氧化物中获得的高效且持久的双功能电催化剂的产生，对于通过电催化水分解法优化生产氢气和氧气至关重要。这项研究旨在证明层状TiO ₂纳米片作为设计电催化剂的适用性。我们通过装饰的TiO表现出的性能₂支撑尼科₂ ö ₄纳米颗粒（镍钴₂ ö ₄ /二氧化钛₂）作为电催化总水分解的催化剂。此外，通常使用的碳基载体材料的腐蚀作用会降低工作效率，从而降低催化剂的整体性能。在这方面，TiO ₂可以更好地替代碳基体系。在室温下合成了层状TiO ₂，并采用简单的热处理方案大规模合成了NiCo ₂ O ₄ / TiO ₂。TiO ₂有助于形成较小的NiCo ₂ O ₄纳米颗粒，也改善了分散性。该双功能电催化剂在10mA cm ^-2的电流密度下具有高的OER和HER性能，分别具有309mV和185mV的低过电势。TiO ₂负载的催化剂还具有其他优点，例如在碱性介质中具有显着的耐久性以及高周转频率（TOF）值。这种廉价的催化剂可在仅1.64 V的电压下提供10 mA cm ^-2的电流密度，并且在整个水分解过程中可稳定运行12小时以上。因此，这种自制系统可为电化学分水应用中的RuO ₂，IrO ₂或Pt等较昂贵的系统提供一种熟练且低成本的替代品。

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Layered TiO2 Nanosheet‐Supported NiCo2O4 Nanoparticles as Bifunctional Electrocatalyst for Overall Water Splitting

Exploring the generation of efficient and long‐lasting bifunctional electrocatalysts obtained from low‐cost transition metal oxides is crucial to the optimal production of hydrogen and oxygen by electrocatalytic water splitting. This study aims to demonstrate the applicability of layered TiO₂ nanosheets as support for designing electrocatalysts. We have demonstrated the performance by decorating the TiO₂ support with NiCo₂O₄ nanoparticles (NiCo₂O₄/TiO₂) as catalysts for electrocatalytic overall water splitting. Moreover, the corrosion effect of usually used carbon‐based supporting materials can decrease the working efficiency and, thus, the overall performance of the catalysts. In this aspect, TiO₂ can be a better alternative to carbon‐based systems. Layered TiO₂ was synthesized at room temperature, and a simple heat treatment protocol was employed for the large‐scale synthesis of NiCo₂O₄/TiO₂. TiO₂ facilitated the formation of smaller NiCo₂O₄ nanoparticles, also improving the dispersion. This bifunctional electrocatalyst exhibits high OER and HER performance with a low overpotential of 309 mV and 185 mV respectively, at a current density of 10 mA cm⁻². TiO₂ supported catalyst also exhibits other advantages like remarkable durability in the alkaline medium along with high turnover frequency (TOF) values. This inexpensive catalyst can deliver a current density of 10 mA cm⁻² at only 1.64 V with a steady performance for more than 12 h for overall water splitting. Thus, this homemade system provides a proficient and low‐cost alternative to the more expensive systems such as RuO₂, IrO₂ or Pt for the electrochemical water splitting applications.

更新日期：2018-10-19

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