The effects of cobalt phthalocyanine and polyacrylic acid on the reactivity of hydrogen peroxide oxidation reaction and the performance of hydrogen peroxide fuel cell

High temperature‐induced myoglobin‐mimic catalytic structure having high axial ligand content for one‐compartment hydrogen peroxide fuel cells

“…To confirm these results in more detail, SEM-EDS analysis was conducted three times to verify the chemical composition of each catalyst, as illustrated in Figure S2 and presented in Table 1. 25,30,33,43 Here, although the Fe elements were optimally separated by the surfaces of all three catalysts, the portion of the Fe element in MMN(HT) was 3.19 and 2.66 times higher than those of MMN(LT) and MMN(RT), which does not agree with the aforementioned expectation. This indicates that the higher temperature conditions induced stronger attachments of hemin molecules to the CNT/PEI, whereas the hemin molecules are weakly bound when the catalyst is fabricated in a room of low-temperature condition.…”

“…To evaluate the structural differences between the three catalysts (MMN(LT), MMN(RT), MMN(HT)), and TEM image of CNT, CNT/PEI, and catalysts were verified (Figure 1, S1 and Table S1). 25,30,31,33,[43][44][45] As a result, the thickness of CNT was 15.5 nm, whereas those of CNT/PEI and catalysts were over 20 nm, showing the thickness was significantly increased compared with that of the CNT after synthesis. These results indicate that the PEI and/or hemin molecules were immobilized onto the CNT surface.…”

“…Additionally, due to the introduction of a onecomponent hydrogen peroxide fuel cell (HPFC), which has no membrane and adopts H 2 O 2 as a fuel for both electrodes, H 2 O 2 can be used as the fuel in a shapedependent fuel cell for various applications, such as bioelectronics and minute power sources operated in close proximity to the user. 11,[24][25][26] Regarding the electrode or catalyst of the HPFC, the combination of nickel bulk metal (anode) and Prussian blue (PB) (cathode) is the most common in recently reported studies. 24,[27][28][29] Although this combination is renowned for its optimal performance in acidic conditions, its performance and durability are not sufficient for physiological conditions; therefore, novel catalysts should be developed for the applications mentioned above, 24,[27][28][29] which should operate under a biocompatible environment such as neutral or slightly alkaline pH condition.…”

“…26,30 For that, several materials, including gold, vitamin B 12 , and its biomimetic nanostructures have recently been reported to replace Ni anodes. 25,26,30,31 However, the alternative of PB cathode is rarely suggested; instead, hemin used nanostructures, which are based on the biomimetics of heme proteins, such as horseradish peroxidase (HRP), hemoglobin, and myoglobin, have been recently reported. [32][33][34] The main concept of using hemin originates from enzymatic fuel cells (EBC) or biosensors with HRP as a biocatalyst for the hydrogen peroxide reduction reaction (HPRR) to generate cathodic current.…”

High performance of the flow-type one-compartment hydrogen peroxide fuel cell using buckypaper and narrow fuel pathway under physiological conditions

“…It should be noted that these results are benefiting from the intrinsic features of BP and adopting PEI, implying that the HPFC performance using BP/PEI/hemin will be quite improved compared with the other electrode and previous studies. 18,20,41,49…”