Nickel‐Borate/Reduced Graphene Oxide Nanohybrid: A Robust and Efficient Electrocatalyst for Oxygen Evolution Reaction in Alkaline and Near Neutral Media,ChemCatChem

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Nickel‐Borate/Reduced Graphene Oxide Nanohybrid: A Robust and Efficient Electrocatalyst for Oxygen Evolution Reaction in Alkaline and Near Neutral Media
ChemCatChem ( IF 3.8 ) Pub Date : 2018-05-02 , DOI: 10.1002/cctc.201800312
Xueying Cao ₁ , Liang Cui ₂ , Xiaoxia Wang ₁ , Wenrong Yang ₁ , Jingquan Liu _{1,

2}

Affiliation

Designing highly active electrocatalysts with cost‐effective transition metals for oxygen evolution reaction (OER) is of vital significance for multifarious energy conversion and storage devices. Herein, a facile in situ co‐reduction method was applied for the preparation of nickel‐borate nanoparticle on reduced graphene oxide (Ni−B_i/RGO) with high surface active sites exposure yield and reinforced electron transfer ability. Such Ni−B_i/RGO nanohybrid shows high catalytic activity with overpotential of 329 mV to drive a geometrical current density of 10 mA cm⁻² and Tafel slop of 79 mV dec⁻¹ in 1 m KOH. Moreover, this Ni−B_i/RGO nanohybrid also displays excellent performance under near neutral condition, with a low onset potential of 352 mV and Tafel slop of 176 mV dec⁻¹ in 0.1 m potassium borate (KB_i, pH 9.2), better than most of Ni‐based OER catalysts. Our research has paved a facile path for the development of highly active electrocatalysts.

中文翻译：

硼酸镍/还原氧化石墨烯纳米杂化物：碱性和近中性介质中氧释放反应的稳健高效催化剂

设计具有成本效益的过渡金属用于氧释放反应（OER）的高活性电催化剂对于多种能量转换和存储设备至关重要。在此，采用一种简便的原位共还原方法在还原的氧化石墨烯（Ni-B _i / RGO）上制备硼酸镍纳米粒子，具有高的表面活性位点暴露率和增强的电子转移能力。这种Ni-B _i / RGO纳米杂化物显示出高催化活性，超电势为329 mV，以在1 m KOH中驱动10 mA cm ^-2的几何电流密度和79 mV dec ^-1的Tafel斜率。而且，这个Ni-B _i/ RGO纳米杂化物在接近中性的条件下也表现出优异的性能，在0.1 m硼酸钾中（KB _i，pH 9.2）的低启动电位为352 mV，Tafel斜率为176 mV dec ^-1，优于大多数基于Ni的OER催化剂。我们的研究为开发高活性电催化剂铺平了一条捷径。

更新日期：2018-05-02

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