Embedding Co2P nanoparticles into N&P co-doped carbon fibers for hydrogen evolution reaction and supercapacitor
Embedding Co2P nanoparticles into N&P co-doped carbon fibers for hydrogen evolution reaction and supercapacitor
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DOI：
10.1016/j.ijhydene.2020.10.018
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发表时间：
2020-10
影响因子：
7.2
通讯作者：
Xingwei Sun;Huan Liu;Guangran Xu;J. Bai;Chunping Li
中科院分区：
文献类型：
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作者：
Xingwei Sun;Huan Liu;Guangran Xu;J. Bai;Chunping Li
高效、低成本的电化学活性材料仍然是电催化和超级电容器领域的迫切需求。本文报道了一种制备高效双功能电极材料的简便方法。通过在二元共掺杂碳纳米纤维（Co2P@N &P-CNFs）中嵌入Co2 P纳米颗粒制备电极材料。这种独特的结构可以有效地防止Co2 P的脱离，并提供丰富的活性位点。在本工作中制备的材料显示出上级的析氢反应（HER）性能，在10 mA cm− 2的电流密度下具有192 mV的过电位和20 h的显著稳定性。此外，以Co2P@N &P-CNFs为正极材料，以碳纳米纤维（CNFs）为负极材料，制备了非对称超级电容器（ASC），表现出优异的循环稳定性（初始电容的91.5%在整个10，000次充放电测试）和22.31 Wh kg− 1的高E，在0.3 A g−1时P为225.02 W kg− 1。本工作为设计HER和超级电容器双功能活性材料提供了一条有效的途径。
The demands for highly efficient and low-cost electrochemically active materials are still urgent needs for the fields of electro-catalysis and supercapacitor. Herein, a facile strategy for preparing high-efficient bi-functional electrode material was reported. The electrode material was prepared through embedding Co2P nanoparticles in the binary co-doped carbon nanofibers (Co2P@N&P-CNFs). This unique structure can effectively prevent the Co2P from detaching and provide abundant active sites. Materials prepared in this work showed the superior hydrogen evolution reaction (HER) performance with overpotential of 192 mV at a current density of 10 mA cm−2and remarkable stability for 20 h. Moreover, the asymmetric supercapacitor (ASC) was fabricated using the Co2P@N&P-CNFs as the positive electrode material and carbon nanofibers (CNFs) as the negative electrode material, which shows an outstanding cycle stability (91.5% of the initial capacitance is retained throughout 10,000 charge-discharge tests) and a high E of 22.31 Wh kg−1at the P of 225.02 W kg−1at 0.3 A g−1. This work offers an effective route in designing bi-functional active materials for HER and supercapacitor.