Javad Hikmati

11 Questions 15 Answers 0 Followers

Questions related from Javad Hikmati

What is the real surface of the platinum electrode?

The geometrical surface of the included electrode is 0.45cm² but the active or the real surface of an electrode often differs from the geometrical one. The current efficiency based on the...

18 May 2020 5,657 5 View

What do you call the electrolyte of sodium sulfate, a base, an acid or neutral ?

PH of distilled water was shown by a PH meter to be around 7. After adding 10wt.% of sodium sulfate the PH decreased to around 5.5PH. The electrolyte then subjected to the electrolysis and the PH...

09 March 2020 2,724 15 View

What is the higher heating value of hydrogen gas?

I am running an electrolyzer which produces hydrogen gas and measured in milli liter. In order to find the efficiency, HHV must be known as J/ml. There are values in textbooks given in 39KWh/kg,...

04 March 2020 7,298 4 View

Why does a high voltage power source gives low current in an electrolyser?

I am using a DC power which is connected to the external main power with max voltage output of 31V and max current output of 5A to run a Hoffman like electrolyzer. In many textbooks, many have...

04 March 2020 9,521 8 View

How does PH of sodium sulfate solution changes with temperature?

Measured the PH of distilled water and was around 6.5-7. After dissolving sodium sulfate the PH decreased to 5.5. Increasing the temperature of that solution didn't affect much the PH value. The...

18 February 2020 2,945 3 View

What is the correct HHV in J/ ml of hydrogen gas ?

Trying to calculate the energy efficiency of an electrolyses by using the formula: eff= HHV* hydrogen volume in ml / ( UIt). where U is voltage, I current, t is time and HHV is the higher heating...

14 January 2020 2,272 3 View

How to calculate the efficiency of hydrogen produced from water electrolysis?

I am doing some experiments on hydrogen production by water electrolysis and trying to calculate the efficiency both in terms of systems efficiency and energy efficiency using the equations...

09 January 2020 4,844 6 View

How many grams of SDS needed to disperse Carbon Black in water?

Trying to disperse 1 gram of Carbon Black ( average size of 55nm) in a 200ml distilled water with SDS surfactant. Some literature mentions that the CMC of SDS in pure water ( no other addition)...

17 October 2019 2,070 1 View

Can SDS being used as electrolyte?

I have been using Sodium sulphate as electrolyte for the water electrolysing using a simple Hoffman apparatus. Tried with SDS which is anionic surfactant but seems like it doesn't conduct electricity.

10 October 2019 6,286 3 View

How much ( wt%) SDS must be added into a nano fluid solution consisting of 0,1gram of carbon black?

I want to make a nano fluid of carbon black ( 0,1 grams) in distilled water (200ml). As carbon black is hydrophobic, there is the need of right amount of surfactant such as SDS. The SDS amount...

02 October 2019 3,941 7 View

How to make a stable dispersion of iron oxide in water?

I am struggling to make a good dispersion of nanofluid with iron oxide in water.

13 September 2019 4,220 7 View