Ou Jinhua, Xiang Juan, Liu Jinxuan, Sun Licheng
Chemistry and Chemical Engineering , Central South University , 410083 Changsha , China.
Department of Material and Chemical Engineering , Hunan Institute of Technology , 421002 Hengyang , China.
ACS Appl Mater Interfaces. 2019 Apr 24;11(16):14862-14870. doi: 10.1021/acsami.8b21626. Epub 2019 Apr 12.
An effective design for counter electrode (CE) catalytic materials with superior catalytic activity, excellent stability, low cost, and a facile fabrication process is urgently needed for industrialization of dye-sensitized solar cells (DSSCs). Herein, we report a facile in situ method to fabricate transparent CoS anchored on an N-doped carbon film electrode through sulfurization of a cobalt-metalloporphyrin metal-organic framework thin film on fluorine-doped tin oxide glass. The transparent film as counter electrode in bifacial DSSCs exhibited higher power conversion efficiency (9.11% and 6.64%), respectively, from front and rear irradiation than that of Pt (8.04% and 5.87%). The uniformly dispersed CoS nanoparticles on an N-doped carbon film provide a large catalytic active area and facilitate the electron transfer, which leads to the excellent catalytic ability of the CoS@N-doped carbon film. In addition, the in situ preparation of the uniform film with a nanosheet structure offers high electrical conductivity and unobstructed access for the diffusion of triiodide to available electroactive sites, resulting in excellent device performance with superior long-term stability over 1000 h under natural conditions.
对于染料敏化太阳能电池（DSSC）的工业化而言，迫切需要一种具有优异催化活性、出色稳定性、低成本且制备工艺简便的对电极（CE）催化材料的有效设计。在此，我们报道了一种简便的原位方法，通过在氟掺杂氧化锡玻璃上对钴金属卟啉金属有机框架薄膜进行硫化，制备出锚定在氮掺杂碳膜电极上的透明CoS。作为双面DSSC对电极的透明薄膜，从正面和背面照射时分别表现出比Pt（8.04%和5.87%）更高的功率转换效率（9.11%和6.64%）。氮掺杂碳膜上均匀分散的CoS纳米颗粒提供了大的催化活性面积并促进电子转移，这导致CoS@氮掺杂碳膜具有优异的催化能力。此外，原位制备的具有纳米片结构的均匀薄膜提供了高电导率以及碘离子向可用电活性位点扩散的畅通通道，从而在自然条件下实现了超过1000小时的优异器件性能和卓越的长期稳定性。
