Yin Jie, Wei Jiazhen, Guo Junxue, Shi Shaozhen, Chai Ning, Zhang Kaixuan, Xu Wenli, Yuan Cang, Liu Ting, Lin Weili, Zhang Qi, Zhou Huawei, Zhang Yingtian, Chen Baoli, Pu Xipeng, Li Wenzhi, Zhang Xianxi
College of Materials Science and Engineering, School of Chemistry and Chemical Engineering, Shandong Provincial Key Laboratory / Collaborative Innovation Center of Chemical Energy Storage & Novel Cell Technology, Liaocheng University, No. 1, Hunan Road, Dongchangfu District, Liaocheng City, Shandong, 252059, P.R. China.
ChemSusChem. 2019 Feb 21;12(4):795-800. doi: 10.1002/cssc.201803000. Epub 2019 Feb 5.
Two-dimensional tungsten sulfide is widely applied in electrocatalysis. However, WS possesses catalytic active sites located at the layer edge and an inert surface for catalysis. Therefore, increasing the exposure of active sites at the edge and effectively activating the inert sites on the surface is an important challenge. Here, an edge/defect-rich and oxygen-heteroatom-doped WS (ED-O-WS ) superstructure was synthesized. The power-conversion efficiency (PCE) of dye-sensitized solar cells (DSCs) based on an ED-O-WS counter electrode reached 10.36 % (under 1 sun, AM 1.5, 100 mW cm ) and 11.19 % (under 40 mW cm ). These values are, to our knowledge, the highest reported efficiency for DSCs based on Pt-free counter electrodes in I /I electrolytes. Analysis of the micro/nano structure and the electrocatalytic mechanism indicate that ED-O-WS exhibits metallic properties in the electrolyte, and that abundant edges and defects as well as oxygen doping in ED-O-WS play an important role in improving the catalytic activity of WS . Moreover, ED-O-WS displays better catalytic reversibility for I /I electrolytes than Pt.
二维硫化钨在电催化中有着广泛应用。然而，WS的催化活性位点位于层边缘，且存在催化惰性表面。因此，增加边缘活性位点的暴露并有效激活表面的惰性位点是一项重大挑战。在此，合成了一种富含边缘/缺陷且氧杂原子掺杂的WS（ED-O-WS）超结构。基于ED-O-WS对电极的染料敏化太阳能电池（DSC）的功率转换效率（PCE）在1个太阳光照强度（AM 1.5，100 mW/cm²）下达到10.36%，在40 mW/cm²光照强度下达到11.19%。据我们所知，这些数值是基于I⁻/I₃⁻电解质的无Pt对电极DSC所报道的最高效率。对微观/纳米结构及电催化机理的分析表明，ED-O-WS在电解质中表现出金属特性，并且ED-O-WS中丰富的边缘和缺陷以及氧掺杂在提高WS的催化活性方面发挥着重要作用。此外，对于I⁻/I₃⁻电解质，ED-O-WS比Pt表现出更好的催化可逆性。
