Active-Site-Rich 1T-Phase CoMoSe Integrated Graphene Oxide Nanocomposite as an Efficient Electrocatalyst for Electrochemical Sensor and Energy Storage Applications
Authors: Mani Sakthivel
Sukanya Ramaraj
Kuo-Chuan Ho
Shen-Ming Chen
Journal: Analytical chemistry (2019)
Discipline: CHEMISTRY
Keywords: defect/distortion; layered structure; metal chalcogenides; electronic conductivity; electrocatalytic activity
Affiliations: Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan, Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan, Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 10617, Taiwan

Abstract:  The presence of defect/distortion on layered structure of metal chalcogenides facilitate the higher electronic conductivity and electrocatalytic activity. In this work, we have successfully synthesized Co-doped MoSe2(CoMoSe2, Co2MoSe2, Co3MoSe2, and Co4MoSe2) in 1T phase crystal structure by using hydrothermal technique and integrated with graphene oxide (GO). Various analytical techniques such as TEM, STEM, FESEM, XRD, RAMAN, EDX, ICP, and XPS confirmed the formation of 1T phase and defective sites on Co-doped MoSe2. Consequently, the relevant electrochemical studies were followed and reported the significant enhancement in electrocatalytic activity of MoSe2 due to the Co doping and GO hybridization. The proposed GO@CoMoSe2 electrocatalyst was developed to an electrode material for electrochemical sensor and supercapacitor applications. As expected, the GO@CoMoSe2 modified glassy carbon electrode exhibited an excellent electrocatalytic activity toward the sensing of Metol (LOD, 0.009 ŒºM; sensitivity, 2.397 ŒºA ŒºM-1 cm-2). Meanwhile, GO@CoMoSe2-coated nickel foam (NF) achieved feasible specific capacity (431.47 C g-1). In addition, the GO@CoMoSe2//AC asymmetric device exhibited the feasible energy density of 58.32 W h kg-1 at power density of 1800.25 W kg-1. Thus, we concluded that the Co doping and GO hybridization with MoSe2 provide the interesting idea to find out the excellent electrocatalysts with improved electrochemical performances toward the sensing and battery type supercapacitor applications. 

Retracted: No

PubPeer comments:
  Repetition of noise in Figure 2B , 
 #1 More diffractogram cloning in Fig 1a.  , 
 #2 Update.  , 
 Thanks for your valuable comments on this issue. As the authors of this paper, we have observed these comments. To resolve and re-correct this issue, we will contact the corresponding journalu2019s editor. I hope, we will update the corrected version of this paper as soon as possible. Once again, thank you so much for your effort on this issue. , 
 Correction is published. Authors replaced problematic patterns with new ones.  We would like to recorrect the error in Figure 2A,B. It occurred unintentionally during the collection and combining of the XRD data. Thus, the alternate data were used mistakenly in the submitted manuscript. The recorrected Figure 2A,B is provided below. Also, the corresponding discussion about the XRD results needs to be modified. , 
 #5  Figure 2A,B ... occurred unintentionally during the collection and combining of the XRD data .  One diffractogram was unintentionally cut into small segments, which were unintentionally duplicated, and then unintentionally reassembled into a second diffractogram, which we included by mistake when submitting the manuscript. ,