Metalloid tellurium-doped graphene nanoplatelets as ultimately stable electrocatalysts for cobalt reduction reaction in dye-sensitized solar cells
Metalloid tellurium-doped graphene nanoplatelets as ultimately stable electrocatalysts for cobalt reduction reaction in dye-sensitized solar cells
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DOI：
10.1016/j.nanoen.2016.09.001
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发表时间：
2016-12-01
期刊：
影响因子：
17.6
通讯作者：
Baek, Jong-Beom
中科院分区：
文献类型：
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作者：
Jeon, In-Yup;Kim, Hong Mo;Baek, Jong-Beom
染料敏化太阳能电池（DSSC）中Pt催化剂的一种可行替代物是类金属碲（Te）掺杂的石墨烯纳米片（TeGnPs）。这些是通过在Te晶体存在下球磨石墨制备的。在TeGnPs的边缘处引入Te用包括飞行时间二次离子质谱（TOF-SIMS）的各种分析技术确认。本文将所得TeGNP作为DSSC中钴还原反应（CRR）的对电极（CE）材料进行评价。TeGnP-CE的电荷转移电阻（R-ct=0.15 Ω cm（2））比Pt-CE的电荷转移电阻（R-ct=1.77 Ω cm（2））低得多。更重要的是，即使在1000个电势循环之后，TeGnP-CE对于Co（bpy）（3）（2+/3+）（bpy= 2，2 '-联吡啶）氧化还原对也显示出极端的电化学稳定性。用TeGnP-CE制备的SM 315基DSSC的功率转换效率（PCE=11.58%）优于Pt-CE（11.03%），表明TeGnP-CE可能是DSSC中Pt-CE的最佳替代物之一。(C)2016爱思唯尔有限公司版权所有
One feasible alternative to Pt catalyst in dye-sensitized solar cells (DSSCs) is metalloid tellurium (Te)-doped graphene nanoplatelets (TeGnPs). These were prepared by ball-milling graphite in the presence of Te crystals. Introduction of Te at the edges of TeGnPs was confirmed with various analytical techniques including time of flight secondary ion mass spectrometry (TOF-SIMS). The resultant TeGnPs are herein evaluated as counter electrode (CE) materials for the cobalt reduction reaction (CRR) in DSSCs. TeGnP-CE exhibits much lower charge transfer resistance (R-ct=0.15 Omega cm(2)) than that (R-ct=1.77 Omega cm(2)) of Pt-CE. More importantly, TeGnP-CE displays an extreme electrochemical stability for the Co(bpy)(3)(2+/3+) (bpy=2,2'-bipyridine) redox couple even after 1000 potential cycles. The SM315-based DSSC fabricated with TeGnP-CE shows a better power conversion efficiency (PCE=11.58%) than that with Pt-CE (11.03%), suggesting that TeGnP-CE could be one of the best alternatives to Pt-CE in DSSCs. (C) 2016 Elsevier Ltd. All rights reserved.