State Key Lab of Fine Chemicals, Liaoning Key Lab for Energy Materials and Chemical Engineering, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
Nanoscale. 2016 Oct 14;8(40):17458-17464. doi: 10.1039/c6nr00839a.
Alternative high-performance electrocatalysts for triiodide (I) 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 (CHN) and triphenylphosphine ((CH)P) 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 I/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 I will be one of the promising CE materials in DSSCs.
寻求替代高性能电催化剂，以降低成本的染料敏化太阳能电池（DSSC）的三碘化物（I）还原。为了解决这个问题，我们报告了一种通过高效球磨工艺工程化氮磷双掺杂石墨烯（NPG）的简便策略，然后采用简单的热退火方法，分别利用三聚氰胺（CHN）和三苯基膦（（CH）P）作为 N 和 P 源。当用作 DSSC 的对电极（CE）时，这种无金属材料对 I/I 氧化还原反应表现出优异的电催化活性。N 和 P 杂原子的双掺杂通过协同效应显著提高了 DSSC 的光伏性能，实现了 8.57%的高转换效率，优于 Pt CE，远高于单一组分 N 或 P 掺杂石墨烯电极。此外，NPG CE 还表现出出色的电化学稳定性。本研究结果表明，NPG 作为一种低成本、高效的 I 还原电催化剂，将成为 DSSC 中很有前途的 CE 材料之一。
