The testing results show that the properties of the catalyst prepared is stable and reliable, and the working current density reached up to 60 mA/cm2 compared with 20mA/cm2 of the conventional electrode when the same polarization potential is given.
in O_2, the contribution of O_2 oxidizing MnOOH to the potential recovery of the compositeelectrode is very limited. The AC impedance analysis of MnO2-Pt/C composite electrode has disclosed: in the case of oxygen starvation with polarization potential of 0.3V vs.Ag/AgCl, the reaction resistances of Pt/C electrode and MnO2-Pt/C electrode is 196? and 3.04?
The results showed air electrode(1cm2) which had been optimized exhibited good performance that short circuit current of aluminum/air battery was as high as 380mA and the polarization potential was diminished from 0.259V to 0.212V at 60mA/cm2 when the concentration of salt electrolyte was 2mol/l.
After compared several processes of posttreatment, it is recognized that forming overpassive film at 1000 mV polarization potential and than post-treating at the same potential in Na_2MoO_4 can obtain the surface film having better synthetical properties.
The results show that the properties of seawater corrosion resistance of rebar in fly ash concrete are obviously superior to that in normal concrete,resulting from the increase of impedance,diffusion impedance coefficient of the fly ash concrete,and the increase of resistance,capacity of rebar membrance and positive polarized potential by second hydration of fly ash. 〔
Research method: Combining subway's actual conditions with the deciding target set in standards for the hazards of the stray current, selects polarized potential of the underground metal as the monitor parameter, utilizes Cu/CuSO4 as comparing electrode because of its qualities such as stable voltage, not easy to be polarized, low resistance and mechanical intensity.
Distributions of the local potentials,local current densities and pH inside the crevice were measured at three applied control potentials(E_k) of-0.85,-1.0,and(-1.15 V_(CSE)),and at three crevice opening thickness(δ) of 0.15,0.30,and 0.45 mm. Distribution curves of local potentials and local current densities inside crevice became more uniform with increasing polarization time.
It was found that the sorption of tyrosine and tryptophan is significantly affected by both the polarization potential of the adsorbent and pH of the solution.
A mercury-carbon electrode formed in situ on a carbon fiber support (at a mercury film thickness of 0.33 nm and a polarization potential sweep rate of 100-1000 V/s) exhibited properties typical of an indifferent solid electrode.
Effects of casting temperature of Pb-Sb-Sn grid alloy on the polarization potential of oxygen evolution of lead acid batteries
The electrochemical polarization potential of oxygen evolution at the surface of lead-antimony-tin alloy is varied in different casting temperature of electrode production, which is used in the most of battery manufacturer.
The results show the polarization potential for oxygen gas evolution to vary with casting temperature for production of lead-antimony electrodes.
The distribution in correlation times reflects noticeable spatial fluctuations of local potentials in the LaF3 superionic conductor.
Within the resulting computing scheme it is possible to calculate the electronic structure of crystals with and without a surface, of molecular clusters and of solid films on the basis of local potentials.
A theoretical approach, in which the potential functions representing rotational isomerization processes are expressed in terms of linear combinations of local potentials, is presented.
In the case of spherically symmetric interaction the result forB(T) agrees with the well known expression ofBeth andUhlenbeck, but the method given here is also valid for non-spherically symmetric and even for non-local potentials.
Nonlocal potentials can in general be transformed only approximately into local potentials with additional energy dependence.