Nickel-Borate/Reduced Graphene Oxide Nanohybrid: A Robust and Efficient Electrocatalyst for Oxygen Evolution Reaction in Alkaline and Near Neutral Media
Nickel-Borate/Reduced Graphene Oxide Nanohybrid: A Robust and Efficient Electrocatalyst for Oxygen Evolution Reaction in Alkaline and Near Neutral Media
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DOI：
10.1002/cctc.201800312
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发表时间：
2018-07-09
期刊：
影响因子：
4.5
通讯作者：
Liu, Jingquan
中科院分区：
文献类型：
--
作者：
Cao, Xueying;Cui, Liang;Liu, Jingquan
利用高性价比的过渡金属设计出高活性的析氧反应电催化剂对多种能量转换和存储装置具有重要意义。本文采用原位共还原法在还原氧化石墨烯（Ni-B-i/RGO）上制备硼酸镍纳米颗粒，具有较高的表面活性位点暴露率和增强的电子转移能力。该Ni-B-i/RGO纳米杂化物具有较高的催化活性，过电位为329mV，在1m KOH下驱动几何电流密度为10mAcm(-2)， Tafel斜率为79mVdec（-1）。此外，该Ni-B-i/RGO纳米杂化物在近中性条件下也表现出优异的性能，在0.1m硼酸钾（KBi, pH9.2）中，起始电位为352mV， Tafel斜率为176mVdec(-1)，优于大多数ni基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。
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 329mV to drive a geometrical current density of 10mAcm(-2) and Tafel slop of 79mVdec(-1) in 1m KOH. Moreover, this Ni-B-i/RGO nanohybrid also displays excellent performance under near neutral condition, with a low onset potential of 352mV and Tafel slop of 176mVdec(-1) in 0.1m potassium borate (KBi, pH9.2), better than most of Ni-based OER catalysts. Our research has paved a facile path for the development of highly active electrocatalysts.