Template-free synthesis of interconnected carbon nanosheets via cross-linking coupled with annealing for high-efficiency triiodide reduction,Green Chemistry

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Template-free synthesis of interconnected carbon nanosheets via cross-linking coupled with annealing for high-efficiency triiodide reduction
Green Chemistry ( IF 9.3 ) Pub Date : 2017-11-21 00:00:00 , DOI: 10.1039/c7gc02701j
Mingyu Li _{1,

2,

3,

4,

5} , Chang Yu _{1,

2,

3,

4,

5} , Chao Hu _{6,

7,

8,

9} , Changtai Zhao _{1,

2,

3,

4,

5} , Mengdi Zhang _{1,

2,

3,

4,

5} , Yiwang Ding _{1,

2,

3,

4,

5} , Xiuna Wang _{1,

2,

3,

4,

5} , Jieshan Qiu _{1,

2,

3,

4,

5}

Affiliation

Counter electrodes (CEs) play critical roles in the reduction and regeneration of triiodide/iodide redox couple in dye-sensitized solar cells (DSSCs). Compared to commercial Pt, cost-efficient CEs with excellent electrocatalytic activity and superior electrochemical stability are highly desired. Herein, we report a facile, template- and active agents-free fabrication strategy for the synthesis of carbon nanosheets (CNSs) via annealing of small molecular precursors. This process was achieved by a combined strategy, including a low-temperature solid-phase cross-linking reaction and a subsequent high temperature annealing. When employed as metal-free CEs for DSSCs, the as-obtained CNSs demonstrated an annealing temperature-dependent electrochemical behavior. Owing to the superior electrical conductivity and electrocatalytic activity, the CNSs obtained by annealing at 1200 °C exhibit the best electrochemical performance with a power conversion efficiency of 8.71%, which is superior to that of Pt CE (7.24%), thus being attractive alternatives to precious metal Pt CEs. This study presents a simple and effective strategy to configure nanostructured carbonaceous materials for high-performance energy storage and conversion.

中文翻译：

通过交联结合退火的无模板合成互连碳纳米片，实现高效三碘化物还原

对电极（CE）在染料敏化太阳能电池（DSSC）中的三碘化物/碘化物氧化还原对的还原和再生中起关键作用。与商业化的Pt相比，人们迫切需要具有出色的电催化活性和优异的电化学稳定性的高性价比CE。在这里，我们报告一个浅显的，模板-和活性剂-免费的碳纳米片（CNSS）合成制造策略通过小分子前体的退火。该过程是通过组合策略实现的，包括低温固相交联反应和随后的高温退火。当用作DSSC的无金属CE时，所获得的CNS表现出退火温度依赖性的电化学行为。由于优异的电导率和电催化活性，在1200°C退火后获得的CNS表现出最佳的电化学性能，功率转换效率为8.71％，优于Pt CE（7.24％），因此是有吸引力的替代品到贵金属Pt CE。这项研究提出了一种简单有效的策略来配置纳米结构的碳质材料，以实现高性能的能量存储和转换。

更新日期：2018-01-02

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