Amorphous Fe-Ni-P-B-O Nanocages as Efficient Electrocatalysts for Oxygen Evolution Reaction
Amorphous Fe-Ni-P-B-O Nanocages as Efficient Electrocatalysts for Oxygen Evolution Reaction
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DOI：
10.1021/acsnano.9b05571
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发表时间：
2019-11-01
期刊：
影响因子：
17.1
通讯作者：
Yan, Qingyu
中科院分区：
文献类型：
--
作者：
Ren, Hao;Sun, Xiaoli;Yan, Qingyu
电催化剂是克服析氧反应动力学缓慢的重要手段之一。在此，非晶态Fe-Ni-P-B-O（FNPBO）纳米笼作为有效的OER催化剂是通过一种简单的低成本和可扩展的方法在室温下合成的。样品是化学稳定的，与报道的不稳定甚至自燃的硼化物样品形成鲜明对比。可以连续调节FNPBO纳米笼的Fe/Ni比以优化OER催化性能。由多组分元素组成的FNPBO纳米笼可以削弱金属-金属键，从而重新排列催化金属原子中心周围的电子密度，降低中间体形成的能垒。因此，优化后的FNPBO（Fe6.4Ni16.1P12.9B4.3O60.2）催化剂表现出上级的本征OER电催化活性。过电位低，电流密度为10 mA cm（-2）（236 mV），塔菲尔斜率小，（39 mV dec（-1）），以及高比电流密度（26.44 mA cm（-2））与最新技术的RuO 2（分别为327 mV、136 mV dec（-1）和0.028 mA cm（-2））形成鲜明对比。
Electrocatalysts are one of the most important parts for oxygen evolution reaction (OER) to overcome the sluggish kinetics. Herein, amorphous Fe-Ni-P-B-O (FNPBO) nanocages as efficient OER catalysts are synthesized by a simple low-cost and scalable method at room temperature. The samples are chemically stable, in clear contrast to reported unstable or even pyrophoric boride samples. The Fe/Ni ratio of the FNPBO nanocages can be continuously adjusted to optimize the OER catalytic performance. The FNPBO nanocages composed of multicomponent elements can weaken the metal-metal bonds, thus rearranging the electron density around the catalytic metal atom centers and reducing the energy barrier for intermediate formation. Hence the optimized FNPBO (Fe6.4Ni16.1P12.9B4.3O60.2) catalyst shows superior intrinsic electrocatalytic activity for OER. The low overpotential to afford the current density of 10 mA cm(-2) (236 mV), the small Tafel slope (39 mV dec(-1)), and the high specific current density (26.44 mA cm(-2)) at a given overpotential of 300 mV make a sharp contrast to state-of-the-art RuO2 (327 mV, 136 mV dec(-1), and 0.028 mA cm(-2), respectively).