Preparation and Electrochemical Characteristics of MnOx–CoTMPP∕BP Composite Catalyst for Oxygen Reduction Reaction in Alkaline Solution

Abstract

MnO x -cobalt tetramethoxyphenylporphyrin ͑CoTMPP͒/black pearls 2000 carbon black ͑BP͒ composite catalysts were synthesized by depositing CoTMPP onto carbon-supported MnO x ͑MnO x /BP͒, followed by heat-treatment from 500 to 900°C in N 2 atmosphere. The electrochemical characteristics of the catalysts for oxygen reduction reaction ͑ORR͒ were evaluated by the rotating disk electrode technique in half cells using 1 M KOH solution. BP2000 was used as a carbon support, which was pretreated with 30% H 2 O 2 to enhance the catalytic activities. Koutecky-Levich plots reveal a two-electron process, giving evidence that the ORR is mainly controlled by the formation of H 2 O 2 . Doping MnO x into the carbon support improves the activity of catalysts for ORR. There are two oxygen reduction peaks produced from these catalysts during the negative cyclic voltammetry scan. We obtained the best results using 800°C for the heat-treatment. At these conditions the X-ray diffraction results revealed that is mainly cubic MnO. The battery performance of a zinc-air single cell using MnO x -CoTMPP/BP as cathode catalyst was investigated, and the results show that the battery has good performance; the maximum output current density reached 216.3 mA/cm 2 at a potential of 1.0 V.

Nonprecious metal catalysts for the molecular oxygen‐reduction reaction

“…The plasma-enhanced impregnation method, microwave method, and ultrasonic spray pyrolysis method have also been applied to synthesize CoTMPP electrocatalysts [103,108]. Some composite catalysts such as MnO x -CoTMPP/BP, CoTMPP-TiO 2 NT/BP have been developed by Xie et al [109,110].…”

Low temperature pyrolyzed cobalt tetramethoxy phenylporphyrin catalyst and its applications as an improved catalyst for metal air batteries

“…6 and 7 display the ring and disk currents for both CoTMPP/C samples at a rotating rate of 1600 rpm. The electron transfer number and percentage of H 2 O 2 yielded were calculated based on the following equations [17,18]:…”

Investigation of properties of Co porphyrine pyrolysis products and identification of nature of molecular oxygen reduction active centers in basic electrolyte

“…in the presence of metals M (cobalt or iron) represent inexpensive non platinum catalysts of molecular oxygen electroreduc tion. At present, materials of the C-N-M type are one of the most promising cathodic catalysts for alka line fuel cells (FCs), including: FCs with an anion exchange membrane [1] and also for alkaline metalair power sources [2]. This is possible due to their high catalytic activity in the reaction of О 2 reduction com parable with that of Pt [3], low yield of H 2 O 2 [3], and chemical stability in alkaline media [4].…”