Molybdenum diselenide (MoSe 2 ) for energy storage, catalysis, and optoelectronics

2D MoSe2 Structures Prepared by Atomic Layer Deposition

“…In these works (CH 3 ) 2 S 2 or H 2 S were used as the S precursor and Mo(CO) 6 , MoCl 5 or Mo(thd) 3 as the Mo precursors. From the practical point of view, MoSe 2 is even more interesting than MoS 2 since MoSe 2 possesses a higher electrical conductivity than MoS 2 which is extremely important in electrochemical applications such as solar cells, batteries, supercapacitors, and electrocatalysis . To the best authors’ knowledge, there is no report on 2D MoSe 2 films or flakes deposited by ALD.…”

Mixed 3D/2D dimensional TiO2 nanoflowers/MoSe2 nanosheets for enhanced photoelectrochemical hydrogen generation

“…In Figure C, the asymmetric O 1s XPS peak was composed of two peaks, one locating at 530.3 eV was assigned to Ti‐O of TiO 2 , while the other at 531.2 eV was ascribed to the absorbed OH at the surface . Mo 3d peaks of Mo 3d 5/2 and Mo3d 3/2 with the 2H structure were observed at 229.64 and 232.91 eV, while the peaks of Mo 3d 5/2 and Mo3d 3/2 with the 1T structure located at lower binding of 228.73 and 231.86, respectively, which further confirmed the coexistence of 2H and 1T MoSe 2 in the TiO 2 NFs/MoSe 2 composite . The binding energies located at 54.3 eV and 55 eV were ascribed to Se 3d5/2 and Mo 3d3/2 in Figure E, respectively, indicating the existence of Se 2‐ …”

“…The XRD patterns of pure MoSe 2 consist of rhombohedral MoSe 2 (JCPDS: 20‐0757, a = b = 3.232 Ǻ, and c = 19.392 Ǻ) and hexagonal MoSe 2 (JCPDS: 29‐0914, a = b = 3.287 Ǻ, and c = 12.925 Ǻ), which corresponds to the 1T and 2H structure of MoSe 2 . 2H structure has a semiconducting nature while the 1T is metallic, which exhibits much higher conductivity than that of the semiconducting phase . Except for the diffraction peaks of FTO glass (JCPDS #41‐1445), the diffraction peaks of TiO 2 NFs were located at 27.45°, 36.09°, 62.74°, 69.01°, 69.79°, respectively, corresponding to TiO 2 rutile phases (110), (101), (002), (301), and (112) (JCPDS #21‐1276).…”

“…Compared with MoS 2 , layer structured molybdenum diselenide (MoSe 2 ) with 1T structure shows better conductivity and favors the electrochemical reactions, and thus has the ability to serve as a HER catalyst . Meanwhile, the unsaturated Se atoms at the edge and those at defective points exhibit excellent catalytic activity during HER process . Moreover the band structure of MoSe 2 can be tuned with band gap value as high as 1.7‐1.9 eV, which allows the wide visible light response and effectively extends the light absorption region .…”

2D/2D Graphitic Carbon Nitride (g-C3N4) Heterojunction Nanocomposites for Photocatalysis: Why Does Face-to-Face Interface Matter?

“…Keywords: graphitic carbon nitride (g-C3N4), photocatalysis, energy conversion, environmental remediation, 2D/2D heterojunction, face-to-face interface iNTRODUCTiON Photocatalysis is emerged as one of the Holy Grails of sustainable and green technologies for solar energy conversion, energy storage, and environmental remediation, which has been intensively examined over the past few decades worldwide to search for novel photocatalysts (Inoue et al, 1979;Linsebigler et al, 1995;Ma et al, 2014;Ong et al, 2014aOng et al, , 2016bHe and Que, 2016;Li et al, 2016a;Wenderich and Mul, 2016;Zhang et al, 2016a;Eftekhari, 2017;Liu et al, 2017;Osterloh, 2017;Roger et al, 2017). By harvesting solar energy as the source of renewable energy, photocatalysis will make significant impacts in the areas of (1) light-driven water splitting to hydrogen (H2) and oxygen (O2) (Chen et al, 2010;Bai et al, 2016;Wei et al, 2016;Putri et al, 2017;Yubin et al, 2017), (2) conversion of carbon dioxide (CO2) to energy bearing fuels (Ong et al, , 2014cTan et al, 2014Tan et al, , 2016Tan et al, , 2017Gui et al, 2015;Guo et al, 2016a;Zhang et al, 2016c), (3) mineralization of waste and pollutants (Ong et al, 2014d,e;Fang et al, 2016;Liu et al, 2016c;Topcu et al, 2016;Zhao et al, 2016b), (4) selective organic transformations (Liu et al, 2014;Zhao et al, 2016a), and (5) disinfection of bacteria (Keane et al, 2014;Bing et al, 2015) (Figure 1).…”