to be true i dont now
Electrode potential is the voltage that an electrode is at. This has to be measured versus a reference electrode
Standard electrode potential is a redox electrode. This is the forms the basis of the thermodynamic scale.
Standard electrode potentials are listed in the table in decreasing order, with the strongest reducing agents (highest standard reduction potentials) at the top and the strongest oxidizing agents (lowest standard reduction potentials) at the bottom. The potentials are measured relative to the standard hydrogen electrode.
The standard electrode potential of sulfur is 0.48 V when reacting in a cell with hydrogen at standard conditions of 25°C and 1 atm.
The standard electrode potential of nitrate (NO3-) is +0.96 V. This value is for the reduction half-reaction of nitrate to nitrite under standard conditions.
E(SCE)-E(H)=241 mV @25°C SHE is a primary standard electrode bt SCE is secondary reference electrode use for more easier work than SHE & SCE,s potential also measured by taking SHE as reference electrode.
Perhaps a rephrasing of the question would help; I've never seen a hydrogen electrode so I don't know how it compares to zinc. The process being done would probably also help (are you electroplating or separating oxygen from hydrogen or ...?), as would the solution the electrodes are immersed in (does the solution react with zinc at room temperature, is it being used in a gas, ...?)
Standard electrode potentials are determined through experiments where the half-cell reaction is coupled with a standard hydrogen electrode. By measuring the voltage generated, the standard electrode potential for the half-cell reaction can be calculated. The values in the Standard Reduction Potentials table are based on these experimental measurements.
Scientists typically use a standard hydrogen electrode (SHE) as a reference electrode to measure the standard reduction potential of a half-cell. The half-cell under study is connected to the SHE through a salt bridge, and the cell potential is measured using a voltmeter. By comparing the potential of the half-cell with that of the SHE at standard conditions (1 M concentration and 25 degrees Celsius), the standard reduction potential of the half-cell can be determined.
The standard electrode potential of aluminum is -1.66 V. This means that in a standard electrochemical cell, aluminum tends to be oxidized (lose electrons) rather than reduced.
The standard hydrogen electrode (SHE) is a reference electrode used in electrochemistry to measure electrode potential. It consists of a platinum electrode in contact with a solution of hydrogen ions at unit activity and surrounded by hydrogen gas at a pressure of 1 bar. The SHE has an assigned potential of 0 V at all temperatures.
The standard electrode potential of carbon is 0 V when referenced against the standard hydrogen electrode (SHE). This means that carbon is neither a strong oxidizing agent nor a strong reducing agent under standard conditions.