Makoto Togami

Leave a Nest Co., Ltd.

Fast oxygen (O2) reduction at high positive potential is essential to obtain effective green energy conversion systems. Here, in an attempt to develop a desirable O2 reduction biocathode for fuel cells using laccase (Lac), we modify the surface of single-walled carbon nanotubes (SWCNTs) with various biosurfactants to obtain fast direct electron tra...

The rate of heterogeneous direct electron transfer of laccase immobilized on single-walled carbon nanotube (SWCNT) and carbon paper electrodes was evaluated by cyclic voltammetry and background-current-corrected steady-state linear voltammetry. These rates indicated that the molecular orientation of laccase immobilized on the SWCNT electrode was mo...

A simple method, using an additive compound, for improving bioelectrocatalytic current based on a direct electron transfer reaction between laccase (Lac) and a graphene nanoplatelet-film electrode was demonstrated. Sodium dihydrogen phosphate (NaH2PO4), sodium dodecyl sulfate (SDS), or glucose as an additive compound was added to the paste of graph...

Achieving oxygen reduction at high positive potentials with fast heterogeneous electron transfer is desirable for the biocathode of fuel cells based on enzymes. Here we present an effective interface for obtaining direct electron transfer from a laccase (Lac) based cathode for O2 reduction, starting from a potential very close to the redox equilibr...

An inexpensive and one-step method for the de-oxygenation of graphite oxide (GO) using iron metal powder (Fe) in strongly acidic media is reported. Considering that Fe is non-toxic compared to hydrazine, this near room temperature method is very effective in removing most of the oxygen functionalities, as evidenced by extensive analytical character...

The effect of adsorbed molecular oxygen on the oxidative corrosion of single-walled carbon nanotubes in aqueous solution was investigated by Raman spectroscopy. Adsorbed molecular oxygen affected nucleation and growth in the electrochemical oxidative corrosion of single-walled carbon nanotubes in aqueous electrolyte. Nucleation and growth began at...

Non-doped and N-doped SWCNTs (N-SWCNTs) were used to clarify the effect of N-doping on a direct electron transfer (DET) reaction of laccase (Lac, from Trametes sp.). The level of N-doping in the carbon phase of the N-SWCNTs, which were synthesized by a CVD method, was determined to be 0.1, 2.4, and 4.1% from X-ray photoelectron spectroscopy measure...