One-step conversion from Ni/Fe polyphthalocyanine to N-doped carbon supported Ni-Fe nanoparticles for highly efficient water splitting
One-step conversion from Ni/Fe polyphthalocyanine to N-doped carbon supported Ni-Fe nanoparticles for highly efficient water splitting
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DOI：
10.1016/j.nanoen.2016.10.035
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发表时间：
2016-12
期刊：
影响因子：
17.6
通讯作者：
Zhengping Zhang;Yeshen Qin;M. Dou;J. Ji;Feng Wang
中科院分区：
文献类型：
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作者：
Zhengping Zhang;Yeshen Qin;M. Dou;J. Ji;Feng Wang
析氧反应（OER）和析氢反应（HER）作为水裂解中的两个半反应，传统上都是用昂贵且稀缺的贵金属（如Ru、Ir和Pt）作为电催化剂进行的，阻碍了其在水裂解中的大规模应用。本文开发了一种低成本、高效的方法，通过直接热解处理，将交联聚酞菁一步转化为氮掺杂碳负载的镍铁纳米颗粒（NiFe@NC）电催化剂。所得NiFe@NC电催化剂在OER和HER两种双功能电极上均表现出高效的催化活性和耐用性。在阳极和阴极两侧使用相同NiFe@NC电催化剂的水分解装置可以在1 M KOH水溶液中以较低的电池电压（1.81 V, 10 mA cm - 2）运行，并且具有优异的耐久性（在8,10和20 mA cm - 2下运行超过15小时）和高可逆性。优异的电催化性能表明NiFe@NC电催化剂有望取代贵金属，实现更实用、更经济的水分解。本工作为对称水分解装置制备高效、低成本的镍基电催化剂提供了一种新方法。
As the two half-reactions in water splitting, the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) are traditionally carried out with high-cost and scarce precious metals (e.g., Ru, Ir and Pt) as the electrocatalysts, which hampers the large-scale applications in water splitting. Herein, we developed a low-cost and efficient method to prepare the nitrogen-doped carbon supported nickel-iron nanoparticle (NiFe@NC) electrocatalysts, simply by one-step conversion from cross-linked polyphthalocyanine under the direct pyrolysis treatment. The resultant NiFe@NC electrocatalysts exhibit the efficient catalytic activity and durability for both OER and HER as bi-functional electrodes in water splitting device. The water splitting device based on the same NiFe@NC electrocatalyst at both sides of anode and cathode can operate with lower cell voltage (1.81 V, at 10 mA cm−2) in 1 M KOH aqueous electrolyte, as well as excellent durability (over 15 h of operation at 8, 10 and 20 mA cm−2) and high reversibility. The excellent electrocatalytic performance indicates that NiFe@NC electrocatalysts can be the promising replacement of the precious metals for more practical and cost-efficient water splitting. This work develops a new method for the preparation of high efficient and low-cost Ni-based electrocatalysts for symmetrical water splitting devices.