Nickel Cobalt Sulfide Double-Shelled Hollow Nanospheres as Superior Bifunctional Electrocatalysts for Photovoltaics and Alkaline Hydrogen Evolution
Nickel Cobalt Sulfide Double-Shelled Hollow Nanospheres as Superior Bifunctional Electrocatalysts for Photovoltaics and Alkaline Hydrogen Evolution
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硫化镍钴双壳空心纳米球作为光伏和碱性析氢的优质双功能电催化剂
DOI：
10.1021/acsami.7b18439
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发表时间：
2018-03-21
影响因子：
9.5
通讯作者：
Hou, Linxi
中科院分区：
文献类型：
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作者：
Jiang, Yiqing;Qian, Xing;Hou, Linxi
具有中空纳米结构的过渡金属硫属化物被认为是用于能量转换和存储的贵金属电催化剂的有前途的替代品。我们通过简单的溶剂热路线合成了NiCo2S4双壳球中球空心球（BHS），并将其同时应用于染料敏化太阳能电池（DSSC）和析氢反应（HER），这是一种清洁且可持续的能源转换方式。得益于其显着的结构特征和有利的化学成分，由微小晶体组成的NiCo2S4 BHS具有大的表面积、清晰的内部空隙和高催化活性。采用NiCo2S4 BHS的DSSC在100 mW cm(-2)辐照下的功率转换效率为9.49%（Pt，8.30%）。此外，NiCo2S4 BHSs作为HER催化剂还具有较小的起始过电势（27.9 mV）和在碱性条件下较低的过电势（10 mA cm(-2)时为89.7 mV）。因此，这项工作为合成 DSSC 和 HER 的双功能电催化剂提供了明智的策略。
Transition metal chalcogenides with hollow nanostructures have been considered as promising substitutes as precious metal electrocatalysts for energy conversion and storage. We synthesized NiCo2S4 double-shelled ball-in-ball hollow spheres (BHSs) via a simple solvothermal route and applied them in both dye-sensitized solar cells (DSSCs) and hydrogen evolution reactions (HERs) at the same time, which were clean and sustainable ways to convert energy. Benefiting from their remarkable structure features and advantageous chemical compositions, NiCo2S4 BHSs composed of tiny crystals possessed large surface area, well-defined interior voids, and high catalytic activity. The DSSC with NiCo2S4 BHSs under 100 mW cm(-2) irradiation possessed a power conversion efficiency of 9.49% (Pt, 8.30%). Besides, NiCo2S4 BHSs as a HER catalyst also possessed a small onset overpotential (27.9 mV) and a low overpotential (89.7 mV at 10 mA cm(-2)) under alkaline conditions. Therefore, this work offers a sensible strategy to synthesize bifunctional electrocatalysts for DSSCs and HERs.