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Synthesis of Tri‐functional Core‐shell CuO@carbon Quantum Dots@carbon Hollow Nanospheres Heterostructure for Non‐enzymatic H 2 O 2 Sensing and Overall Water Splitting Applications
Author(s) -
Kumar J. Sharath,
Bolar Saikat,
Murmu Naresh Chandra,
Ganesh R. Sankar,
Inokawa Hiroshi,
Banerjee Amit,
Kuila Tapas
Publication year - 2019
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201900226
Subject(s) - overpotential , water splitting , materials science , catalysis , electrochemistry , quantum dot , raman spectroscopy , carbon fibers , oxygen evolution , heterojunction , chemical engineering , inorganic chemistry , analytical chemistry (journal) , nanotechnology , composite number , electrode , chemistry , photocatalysis , optoelectronics , composite material , biochemistry , physics , engineering , optics , chromatography
A core‐shell structure with CuO core and carbon quantum dots (CQDs) and carbon hollow nanospheres (CHNS) shell was prepared through facile in‐situ hydrothermal process. The composite was used for non‐enzymatic hydrogen peroxide sensing and electrochemical overall water splitting. The core‐shell structure was established from the transmission electron microscopy image analysis. Raman and UV‐Vis spectroscopy analysis confirmed the interaction between CuO and CQDs. The electrochemical studies showed the limit of detection and sensitivity of the prepared composite as 2.4 nM and 56.72 μA μM −1 cm −2 , respectively. The core‐shell structure facilitated better charge transportation which in turn exhibited elevated electro‐catalysis towards hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and overall water splitting. The overpotential of 159 mV was required to achieve 10 mA cm −2 current density for HER and an overpotential of 322 mV was required to achieve 10 mA cm −2 current density for OER in 1.0 M KOH. A two‐electrode system was constructed for overall water splitting reaction, which showed 10 and 50 mA cm −2 current density at 1.83 and 1.96 V, respectively. The prepared CuO@CQDs@CHNS catalyst demonstrated excellent robustness in HER and OER catalyzing condition along with overall water splitting reaction. Therefore, the CuO@CQDs@CHNS could be considered as promising electro‐catalyst for H 2 O 2 sensing, HER, OER and overall water splitting.