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Title: Understanding the effects of cationic dopants on α-MnO2 oxygen reduction reaction electrocatalysis

Journal Article · · Journal of Physical Chemistry. C

Nickel-doped α-MnO2 nanowires (Ni–α-MnO2) were prepared with 3.4% or 4.9% Ni using a hydrothermal method. A comparison of the electrocatalytic data for the oxygen reduction reaction (ORR) in alkaline electrolyte versus that obtained with α-MnO2 or Cu–α-MnO2 is provided. In general, Ni-α-MnO2 (e.g., Ni-4.9%) had higher n values (n = 3.6), faster kinetics (k = 0.015 cm s–1), and lower charge transfer resistance (RCT = 2264 Ω at half-wave) values than MnO2 (n = 3.0, k = 0.006 cm s–1, RCT = 6104 Ω at half-wave) or Cu–α-MnO2 (Cu-2.9%, n = 3.5, k = 0.015 cm s–1, RCT = 3412 Ω at half-wave), and the overall activity for Ni–α-MnO2 trended with increasing Ni content, i.e., Ni-4.9% > Ni-3.4%. As observed for Cu–α-MnO2, the increase in ORR activity correlates with the amount of Mn3+ at the surface of the Ni–α-MnO2 nanowire. Examining the activity for both Ni–α-MnO2 and Cu–α-MnO2 materials indicates that the Mn3+ at the surface of the electrocatalysts dictates the activity trends within the overall series. Single nanowire resistance measurements conducted on 47 nanowire devices (15 of α-MnO2, 16 of Cu–α-MnO2-2.9%, and 16 of Ni–α-MnO2-4.9%) demonstrated that Cu-doping leads to a slightly lower resistance value than Ni-doping, although both were considerably improved relative to the undoped α-MnO2. As a result, the data also suggest that the ORR charge transfer resistance value, as determined by electrochemical impedance spectroscopy, is a better indicator of the cation-doping effect on ORR catalysis than the electrical resistance of the nanowire.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1343628
Report Number(s):
SAND2017-1258J; 651017
Journal Information:
Journal of Physical Chemistry. C, Vol. 121, Issue 5; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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Transition-Metal-Doped α-MnO 2 Nanorods as Bifunctional Catalysts for Efficient Oxygen Reduction and Evolution Reactions journal March 2018
Recent Progress on Transition Metal Oxides as Bifunctional Catalysts for Lithium‐Air and Zinc‐Air Batteries journal October 2018
Synthesis of Large Surface-Area g-C 3 N 4 Comodified with MnO x and Au-TiO 2 as Efficient Visible-Light Photocatalysts for Fuel Production journal September 2017
Nanoscale Perovskites as Catalysts and Supports for Direct Methanol Fuel Cells journal April 2019
Insights into the spontaneous formation of hybrid PdO x /PEDOT films: electroless deposition and oxygen reduction activity journal January 2018
Electrochemical Oxygen Reduction Reaction Performance Boosted by N, P Doped Carbon Layer over Manganese Dioxide Nanorod journal August 2019
Nanostructured MnO2 as Electrode Materials for Energy Storage journal November 2017
A Pt-free graphenaceous composite as an electro-catalyst for efficient oxygen reduction reaction journal January 2019
Transition metal oxide-based oxygen reduction reaction electrocatalysts for energy conversion systems with aqueous electrolytes journal January 2018
Waste minimized synthesis of pharmaceutically active compounds via heterogeneous manganese catalysed C–H oxidation in flow journal January 2020
One-pot achievement of MnO 2 /Fe 2 O 3 nanocomposites for the oxygen reduction reaction with enhanced catalytic activity journal January 2019
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