Zhan Gang, Zhang Jianfang, Wang Yan, Yu Cuiping, Wu Jingjie, Cui Jiewu, Shu Xia, Qin Yongqiang, Zheng Hongmei, Sun Jian, Yan Jian, Zhang Yong, Tiwary Chandra Sekhar, Wu Yucheng
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China.
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH 45221, United States.
J Colloid Interface Sci. 2020 Apr 15;566:411-418. doi: 10.1016/j.jcis.2020.01.109. Epub 2020 Jan 29.
Atomically thin 2D materials with high surface areas allow engineering its physical and chemical properties with help of combining or decorating with different classes of materials. The hybrid or heterostructure of two different atomically thin materials exhibits completely different chemical and electronics behavior as compared to its parent components. Here, MoS quantum dots (QDs) are decorated onto ultrathin NiO nanosheets (NSs) by using a one-pot hydrothermal process. Uniformly dispersed MoS QDs and ultrathin NiO NSs hybrid/heterostructure can provide more active reaction sites and accelerate the charge transfer rate. Benefiting from the heterointerfaces synergistic effect between MoS QDs and NiO NSs, the MoS QDs/NiO NSs electrode exhibits excellent electrocatalytic activity towards both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). As a bifunctional electrocatalyst, the MoS QDs/NiO NSs electrode has achieved highly efficient overall water splitting activity, which needs a low voltage of 1.61 V to deliver a 10 mA cm with superior stability.
具有高表面积的原子级薄二维材料能够借助与不同种类材料的复合或修饰来调控其物理和化学性质。与原始组分相比，两种不同的原子级薄材料的杂化体或异质结构表现出完全不同的化学和电子行为。在此，通过一锅水热法将MoS量子点（QDs）修饰到超薄NiO纳米片（NSs）上。均匀分散的MoS量子点和超薄NiO纳米片的杂化/异质结构能够提供更多的活性反应位点并加快电荷转移速率。得益于MoS量子点与NiO纳米片之间的异质界面协同效应，MoS量子点/NiO纳米片电极对析氢反应（HER）和析氧反应（OER）均表现出优异的电催化活性。作为一种双功能电催化剂，MoS量子点/NiO纳米片电极实现了高效的全水分解活性，在10 mA cm时只需1.61 V的低电压，且具有优异的稳定性。
