Portal de Periódicos da CAPES

Interface Engineering of MoS 2 /Ni 3 S 2 Heterostructures for Highly Enhanced Electrochemical Overall‐Water‐Splitting Activity

2016; Wiley; Volume: 55; Issue: 23 Linguagem: Inglês

10.1002/anie.201602237

1521-3773

Jian Zhang, Tao Wang, Darius Pohl, Bernd Rellinghaus, Renhao Dong⧫, Shaohua Liu, Xiaodong Zhuang, Xinliang Feng,

Advanced Photocatalysis Techniques

Abstract To achieve sustainable production of H 2 fuel through water splitting, low‐cost electrocatalysts for the hydrogen‐evolution reaction (HER) and the oxygen‐evolution reaction (OER) are required to replace Pt and IrO 2 catalysts. Herein, for the first time, we present the interface engineering of novel MoS 2 /Ni 3 S 2 heterostructures, in which abundant interfaces are formed. For OER, such MoS 2 /Ni 3 S 2 heterostructures show an extremely low overpotential of ca. 218 mV at 10 mA cm −2 , which is superior to that of the state‐of‐the‐art OER electrocatalysts. Using MoS 2 /Ni 3 S 2 heterostructures as bifunctional electrocatalysts, an alkali electrolyzer delivers a current density of 10 mA cm −2 at a very low cell voltage of ca. 1.56 V. In combination with DFT calculations, this study demonstrates that the constructed interfaces synergistically favor the chemisorption of hydrogen and oxygen‐containing intermediates, thus accelerating the overall electrochemical water splitting.