Nitrogen and phosphorus dual-doped graphene as a metal-free high-efficiency electrocatalyst for triiodide reduction
Nitrogen and phosphorus dual-doped graphene as a metal-free high-efficiency electrocatalyst for triiodide reduction
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氮磷双掺杂石墨烯作为无金属高效三碘化物还原电催化剂
DOI：
10.1039/c6nr00839a
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发表时间：
2016
期刊：
影响因子：
6.7
通讯作者：
Qiu Jieshan
中科院分区：
文献类型：
--
作者：
Yu Chang;Liu Zhiqiang;Meng Xiangtong;Lu Bing;Cui Dan;Qiu Jieshan
低成本染料敏化太阳能电池(DSC)中三碘化合物(I3−)还原的替代高性能电催化剂是人们迫切需要的。为了解决这些问题，我们报道了一种简单的策略，通过高效的球磨工艺来设计氮磷双掺杂石墨烯(NPG)，然后分别以三聚氰胺(C3H6N6)和三苯基膦((C6H5)3P)为氮源和磷源进行简单的热退火。当用作对电极时，这种无金属材料对I_3-−/I-−氧化还原反应表现出良好的电催化活性。N、P双掺杂可以协同效应显著提高DSC的光伏性能，其转换效率达到8.57%，优于PtCE，远高于单组分N或P掺杂的石墨烯电极。此外，NPG CE还表现出优异的电化学稳定性。结果表明，NPG作为一种低成本、高效率的I3-−还原电催化剂，将是一种很有前途的直流电催化材料。
Alternative high-performance electrocatalysts for triiodide (I3−) reduction of low-cost dye-sensitized solar cells (DSSCs) are urgently sought after. To address the concerned issues, we report a facile strategy for engineering the nitrogen and phosphorus dual-doped graphene (NPG) via an efficient ball-milling process, followed by a simple thermal annealing approach utilizing melamine (C3H6N6) and triphenylphosphine ((C6H5)3P) as the N and P source, respectively. When employed as the counter electrode (CE) in DSSCs, such a metal-free material exhibits excellent electrocatalytic activity towards the I3−/I− redox reaction. Dual-doping of N and P heteroatoms can markedly enhance the photovoltaic performance of DSSCs by a synergistic effect and a high conversion efficiency of 8.57% is achieved, which is superior to Pt CE, and much higher than that of the single-component N- or P-doped graphene electrodes. In addition, the NPG CE also shows an outstanding electrochemical stability. The present results demonstrate that the NPG as a low-cost and high-efficiency electrocatalyst for reduction of I3− will be one of the promising CE materials in DSSCs.