A multifunctional Ni-doped iron pyrite/reduced graphene oxide composite as an efficient counter electrode for DSSCs and as a non-enzymatic hydrogen peroxide electrochemical sensor. Issue 25 (11th June 2020)

• Record Type: Journal Article
• Authors: Kumar, Sanath; Tsai, Chih-Hung; Fu, Yen-Pei
• Is Part Of: Dalton transactions. Volume 49:Issue 25(2020)
• Page Start: 8516
• Page End: 8527
• Publication Date: 2020-06-11
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d0dt01231a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Facilely synthesized a dual-functional hybrid of nickel-doped FeS2 /rGO for solar energy conversion as an efficient counter electrode and a non-enzymatic H2 O2 sensor applications. Abstract : Nickel-doped FeS2 /rGO composites were synthesized as multifunctional materials via a facile hydrothermal method. The synthesized materials were characterized with XRD, FESEM, XPS, and TEM-SAED for structural, morphological and chemical studies. To study their electrochemical properties, all the synthesized composites were subjected to cyclic voltammetry tests. The optimum composite revealed high catalytic activity with high peak current density, limiting current, and efficiency of 7.60% for DSSC, which surpassed that of a platinum-based counter electrode (6.69%). The efficiency of the DSSC was significantly supported by interfacial studies and electron lifetime studies, and it exhibited lower charge transfer resistance and higher electron lifetime, respectively. Moreover, the fabricated DSSCs with high efficiency were subjected to transient photo-response studies and showed a stable current response with multiple photo-ON and OFF cycles for a period of 600 s. To broaden the application of the synthesized material, it was used as an electrochemical sensor for the efficient sensing of hydrogen peroxide (H2 O2 ). The sensing electrode was modified with the optimum Ni-doped FeS2 /rGO composite, and voltammetric detection was carried out in the hydrogen peroxide concentration range of 4–100 μM. Thus, the synthesized material can be applied in DSSCs and as an electrochemical H2 O2 sensor.