Hybrid n-type Sn1-xTaxO2 nanowalls bonded with graphene-like layers as high performance electrocatalysts for flexible energy conversion devices
Hybrid n-type Sn1-xTaxO2 nanowalls bonded with graphene-like layers as high performance electrocatalysts for flexible energy conversion devices
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与类石墨烯层结合的混合 n 型 Sn1-xTaxO2 纳米墙作为柔性能量转换装置的高性能电催化剂
DOI：
10.1039/c7ta00893g
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发表时间：
2017
影响因子：
11.9
通讯作者：
Pan Feng
中科院分区：
文献类型：
--
作者：
Duan Y;ong;Fu Nianqing;Li Sibai;Yang Xiaoyang;Zheng Jiaxin;Lin Yuan;Pan Feng
本文报道了掺Ta的SnO_2(Sn1-−_xTaxO_2)纳米球(作为富电子给体)与类石墨烯(Sn1-−_xTaxO_2/C)结合，作为柔性能量转换器件的高性能电催化剂。SnO2具有高的电子迁移率(125-250cm2 V−1 S−1)，采用Ta掺杂来增加电子浓度，进一步改善SnO2薄膜的导电性，使其能够用作催化剂载体。我们的第一性原理计算表明，电导的增加主要归因于Ta取代锡引起的本征掺杂效应的增加。掺Ta的SnO2不仅为紧密包覆的石墨烯状碳层提供了良好的导电载体，而且还将电子推进到碳电催化剂上，从而提高了其催化性能。这些纳米墙薄膜的先进特征不仅包括高比表面积，与衬底的良好附着力，而且还包括灵活性。作为对电极的全柔性染料敏化太阳能电池(DSC)的应用表明，在AM1.5G光照(100 mW cm−2)下，全柔性DSC的最佳功率转换效率为8.38%，是全柔性DSC中最高的PCE之一。
We report here hybrid n-type Ta-doped SnO2 (Sn1−xTaxO2) nanowalls (as an electron-rich donor) bonded with graphene-like layers (Sn1−xTaxO2/C) as high performance electrocatalysts for flexible energy conversion devices. SnO2 possesses high electron mobility (125–250 cm2 V−1 S−1), and Ta doping is adopted to increase the electron concentration to further improve the conductivity of the SnO2 film to allow its use as a catalyst support. Our first-principles calculations reveal that the increased electrical conductance is mainly attributed to the increased intrinsic doping effect caused by the substitution of Sn by Ta. The Ta-doped SnO2 not only acts a well conductive support for the close coated graphene-like carbon layers but also pushes electrons to the carbon electrocatalyst to enhance its catalytic performance. Advanced features of these nanowall films include not only a high specific surface area, and good adhesion to substrates, but also flexibility. One application as a counter electrode in fully flexible dye-sensitized solar cells (DSSCs) shows that the optimal power conversion efficiency (PCE) of fully flexible DSSCs is 8.38% under AM1.5G illumination (100 mW cm−2), which is one of the highest PCEs for fully flexible DSSCs.