Jump to main content
Jump to site search

Issue 6, 2018
Previous Article Next Article

Tuning the MnWO4 morphology and its electrocatalytic activity towards oxygen reduction reaction

Author affiliations

Abstract

The present study explores the morphological evolution and structure–activity correlation of manganese tungstate (MnWO4), a new electrocatalyst towards alkaline oxygen reduction reaction (ORR). Morphological tuning was performed by a complexation–precipitation approach employing one-pot hydrothermal synthesis and the obtained material was characterized using XRD, FT-IR and XPS. A peculiar bird-feather (BF) like morphology was obtained by optimizing the structure directing agent (SDA) concentration, reaction temperature and time. Its ORR reactivity was studied by performing macro and micro-electrochemical analysis suggesting a prominent (2 + 2) e pathway having an onset potential of 0.99 V (vs. RHE). Furthermore, the role of the SDA in generating electrocatalytically active sites was mapped by performing comparative scanning electrochemical microscopy imaging (SECM) in the redox-competition (RC) mode. The obtained surface plots correlated well with the rotating ring-disk electrode (RRDE) measurements in response to distinct sample (MnWO4) potentials ranging from kinetic-limited to mass-transfer limited domains. The morphologically optimized MnWO4 was further found to be an efficient electrocatalytic competitor against Pt/C (20%), an expensive and limited noble-metal catalyst.

Graphical abstract: Tuning the MnWO4 morphology and its electrocatalytic activity towards oxygen reduction reaction

Back to tab navigation

Supplementary files

Publication details

The article was received on 25 Nov 2017, accepted on 06 Jan 2018 and first published on 08 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA10380H
Citation: J. Mater. Chem. A, 2018,6, 2681-2692
  •   Request permissions

    Tuning the MnWO4 morphology and its electrocatalytic activity towards oxygen reduction reaction

    A. Tiwari, V. Singh and T. C. Nagaiah, J. Mater. Chem. A, 2018, 6, 2681
    DOI: 10.1039/C7TA10380H

Search articles by author

Spotlight

Advertisements