Ternary FeNiS2 ultrathin nanosheets as an electrocatalyst for both oxygen evolution and reduction reactions
Ternary FeNiS2 ultrathin nanosheets as an electrocatalyst for both oxygen evolution and reduction reactions
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三元 FeNiS2 超薄纳米片作为析氧和还原反应的电催化剂
DOI：
10.1016/j.nanoen.2016.07.032
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发表时间：
2016-09-01
期刊：
影响因子：
17.6
通讯作者：
Yu, Han-Qing
中科院分区：
文献类型：
--
作者：
Jiang, Jun;Lu, Shu;Yu, Han-Qing
高性能且经济高效的电催化剂对于析氧反应（OER）和氧还原反应（ORR）至关重要。在此，我们提供了第一份关于一种简便的胶体方法来制造二维超薄三元 FeNiS2 纳米片（NSs）的报告。当在碱性条件下用作OER催化剂时，它们表现出优于RuO2的电催化性能，并实现了10 mA cm(-2)的电流密度、1.54 V的电位和46 mV decade(-1)的塔菲尔斜率。同时，ORR催化活性也实现了，起始电位为0.78 V，塔菲尔斜率为107 mV dede-1，中性条件下电子转移数为3.92，H2O2%为3.6%，在中性条件下具有高选择性，与商业Pt/C相当。三元 FeNiS(2-)NSs 优于通过相同途径合成的二元 FeS NSs 和 Ni9S8 纳米棒。更重要的是，由于具有对碱性和磷酸盐缓冲溶液的腐蚀和毒害的抵抗力，FeNiS2 NSs表现出优异的稳定性，在长期运行中没有明显的OER或ORR催化活性损失。与二元对应物相比，它们增强的电催化性能表明，开发了一种制备高性能 OER 和 ORR 催化剂的新策略。此外，所制备的 FeNiS2 NSs 可以作为 OER 或 ORR 的无贵金属催化剂，具有良好的电催化活性和实际应用的长期稳定性。 (C) 2016 Elsevier Ltd. 保留所有权利。
High-performance and cost-effective electrocatalysts are essential for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Herein, we provide the first report about a facile colloidal method to fabricate 2D ultrathin ternary FeNiS2 nanosheets (NSs). When serving as an OER catalyst under alkaline conditions, they exhibited superior electrocatalytic performance over RuO2 and achieved a current density of 10 mA cm(-2) with a potential of 1.54 V and a Tafel slope of 46 mV decade(-1). Meanwhile, an ORR catalytic activity was also achieved with an onset potential of 0.78 V, a Tafel slope of 107 mV decade-1, and a high selectivity with electron transfer number of 3.92 and H2O2% of 3.6% at 0.3 V under neutral conditions, which were comparable to those of the commercial Pt/C. The ternary FeNiS(2-)NSs were superior over the binary FeS NSs and Ni9S8 nanorods synthesized via the same routes. More importantly, with the resistance for the corrosion and poison from the alkaline and phosphate buffer solution, the FeNiS2 NSs exhibited superior stability without apparent OER or ORR catalytic activity loss over long-term operation. Their enhanced electrocatalytic performance compared to their binary counterparts indicate that a new strategy to prepare high performance OER and ORR catalysts was developed. In addition, the as-prepared FeNiS2 NSs could serve as a noble-metal-free catalyst for OER or ORR with good electrocatalytic activities and long-term stability for practical applications. (C) 2016 Elsevier Ltd. All rights reserved.