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Phenomena Overpotensial
Hydrogen
Phenomena Overpotensial
Hydrogen
Syahrul Ullum
3334 081639
T. Metalurgi5 April 20111
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Outline
1 Pendahuluan
2 Termodinamika Overpotensial Hidrogen
3 Kinetika Overpotensial Hidrogen
4Referensi
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PENDAHULUAN
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OVERPOTENSIAL?
Selisih potensial proses dengan potensial
kesetimbanganL = Eapplied Eequilibrium
Jenis-Jenis Overpotensial1. Overpotensial Konsentrasi
2. Overpotensial Aktivasi
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Termodinamika Overpotensial
Diagram PolariasiDiagram Polariasi
3 Kondisi
Tidak PerluTidak Perlu
OverpotensialOverpotensial
Aqueous Solution
PerluPerlu
OverpotensialOverpotensial
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PerluPerluOverpotensialOverpotensial
Aqueous Solution Non Aqueous Solution
Deret
Volta
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Kondisi I
(a)
Noble
Metals
0E
+
M / M2+
H2 / H+
i
_
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Penjelasan
AAUntuk logam Mulia (Cu,Ag,Au)
BBBersifat kurang reaktif
CC
Aqueous solution electrolysis
DDEfisiensi arus tinggi (hampir 100%)
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Kondisi II
(b)
Metals with
Intermediate
Reactivity
0
E
+
M / M2+
H2 / H+
i
_
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Penjelasan
AAIntermediate reaktivity
BBUntuk Ni, Zn, Cd dan Fe
CC
Aqueous solution electrolysis
DDOverpotensial H2 lebih tinggi
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Kondisi III
(c)
Reactive
Metals
0E
+
M / M2+
H2 / H+
i
_
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Penjelasan
AALogam yang sangat reaktif
BBLogam Alkali dan alkali tanah
CC
Non Aqueous solution ex. Fused salt
DDOverpotensial H2 sangat tinggi
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Kinetika Overpotensial Hidrogen
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Penjelasan
I. Difusi H3O+ dari Bulk Solution menuju double layer
II. H3O+ melewati Double Layer
III. PenguraianH3O
+ = H2O + e
IV. Electrochemical
H3O+ + M + e- p M-H + H2O
2 M-H p 2M + H2
V. Desorpsi gas H2 dari NBL
VI. Pengeluaran gas H2 dari Bulk Solution
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ReferensiH.S Ray & A. Gosh. 1991 Principles of Extractive
Metallurgy 2nd ed.New Delhi : John Willey & Son
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5 April 201115