ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Investigation on impact of mutual interactions between elements of Ag nano-particle core-MOF material shell nano-complex and incorporated hemoglobin on electro-catalysis on H₂O₂ electro-reduction

Ke Wei Sun, Fang Wang, Ting Mei Ma, and Han Zeng

Xinjiang Key Laboratory of Energy Storage and Photoelectrocatalytic Materials, XinJiang Normal University, Chemistry and Chemical Engineering Academy, Urumqi, People’s Republic of China

E-mail: zenghan1289@163.com

Received: 30 September 2021  Accepted: 5 January 2022

Abstract:

Core–shell structure nano-composite made up of Ag nano-wire and metal organic framework material (MOF) was proposed to accommodate Hemoglobin (Hb) molecules. Influences of mutual interactions between Hb and components of core–shell nano-complex on direct electrochemistry and electro-catalytic efficiency on H₂O₂ reduction of nano-composite with Hb attachment is the main objective of this exploration in this submission. The microscopy, spectrometry and electro-chemical techniques were used to achieve such goal in this paper. The experimental results revealed that the abutting ligation between Hb and Ag nano-wire would lead to the prominent alteration in configuration of heme site in Hemoglobin molecule. However such combination would not increase the active energy of substrate electro-reduction seriously. The quasi-reversible redox process with one proton and single electron participation for Hb-based electrode should be imputed to a typical thin-film confining pattern with normalized rate constant of heterogeneous electron shuttle at 6.6 × 10^–2 s⁻¹. Mass transferring step of electro-active species in nano-complex with Hb detention (normalized rate at 1.2 × 10^–4 s⁻¹) should be regarded as the key factor in restraining the efficiency of enzyme-induced catalysis.

Graphical abstract

Keywords: Core–shell structure nano-composite; Ag nano-rod; Metal–organic framework; Hemoglobin; Electro-catalysis

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02070-x

Chemical Papers 76 (5) 2703–2719 (2022)