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© 2018 Elsevier B.V. Electrochemical performance of a 2D Ti3C2Tx (MXene, where T: [dbnd]O, –OH, –F) sheets modified with Pt nanoparticles (PtNPs) was investigated. The results showed that Ti3C2Tx/PtNP nanocomposite deposited on the surface of GCE showed much better and stable redox behavior in an anodic potential window as compared to the GCE modified with pristine Ti3C2Tx MXene. For example, the H2O2 sensor of Ti3C2Tx/PtNP on GCE offered LOD of 448 nM with a potential at which reduction starts of ∼+250 mV (vs. Ag/AgCl) in comparison to values of 883 μM and ∼−160 mV observed for Ti3C2Tx modified GCE. Moreover, the Ti3C2Tx/PtNP sensor could detect small redox molecules such as ascorbic acid (AA), dopamine (DA), uric acid (UA) and acetaminophen (APAP) at a potential higher than +250 mV with high selectivity and LOD down to nM level. We proved that selectivity of detection of such molecules (AA, DA, UA and APAP) could be modulated to high extent using external membranes. Financial support received from the Slovak Scientific Grant Agency VEGA 2/0162/14 and Slovak Research and Development Agency APVV-15-0227 is acknowledged. The research received funding from the European Research Council (No. 311532 ). This publication was made possible by NPRP grant no. 9-219-2-105 from the Qatar National Research Fund . This publication is the result of the project implementation: Centre for materials, layers and systems for applications and chemical processes under extreme conditions – Stage I, ITMS No.: 26240120007 , supported by the ERDF . Dr. Lenka Lorencova graduated from Pavol Jozef Safarik University in Kosice in 2009 and later obtained PhD degree at Department of Biochemistry at Comenius University in Bratislava, Slovakia. She is currently working as a research scientist at the Institute of Chemistry, Slovak Academy of Sciences in Bratislava. Her research interests include advanced electrochemical characterization techniques, design of electrochemical biosensors, surface science and nanotechnology. Dr. Tomas Bertok is a research scientist at the Department of Glycobiotechnology, Institute of Chemistry (SAS). His research is mainly focused on nanostructured interfaces for medical diagnostics and glycomics. He is a supervisor in biotechnology and biochemistry for PhD study and also devotes his free time to science popularization. Dr. Jaroslav Filip has completed MSc at Department of Environmental Protection Engineering, Tomas Bata University in Zlin and obtained his PhD at Slovak Academy of Sciences. His major scientific focus is bioelectrochemistry, bionanotechnology applications for biosensors and biofuel cells and electrochemical topics related to engineering of environment protection. Dr. Monika Jerigova is a vice-head of SIMS Laboratory at International Laser Center in Bratislava. She focuses on secondary ion mass spectrometry by means of surface analysis, two dimensional surface chemical imaging, and three dimensional depth profile. Dr. Dusan Velic is a group leader at Comenius University and a head of SIMS Laboratory at International Laser Center in Bratislava. He focuses on surface structures and nanostructures through dynamics, composition, and topography, by means of time resolved laser spectroscopy, mass spectrometry, and scanning probe microscopy, respectively. Dr. Peter Kasak graduated in 1998 and obtained his Ph.D. in 2003 at Department of Organic Chemistry at Comenius University in Bratislava. In 2001 he joined the group of Professor R. J. M. Nolte at Radboud University Nijmegen as an RA. He was a Lisa Meitner postdoctoral fellow at the University of Vienna before starting research at the Polymer Institute where he was a senior researcher. He currently works in the Centre for Advanced Materials at Qatar University. His interests include modification of surfaces, developing of biocompatible hydrogel matrices, and study of mechanism of free radical polymerization. Dr. Khaled Mahmoud is Senior Scientist at the Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU). His research interest focus on the engineering and synthesis of functionalized 2D- carbon nanomaterials (including MXene, graphene), cellulose nanocrystals, and metal oxides for sustainable water treatment, membrane separation, energy storage, environmental monitoring, nanocatalysis, and enhanced oil recovery (EOR) applications. Dr Jan Tkac is the Head of Department of Glycobiotechnology at the Institute of Chemistry, Slovak Academy of Sciences. His research activities cover label-free and label-based platforms of detection, nanoscale surface patterning protocols, catalytic biosensors and biofuel cells, glycan biochips/biosensors, and lectin/antibody-based affinity biosensors/biochips. In the past he was recipient of an Individual Marie Curie Fellowship and ERC Consolidator grant.