e-journal

A Four-Electron O2-Electroreduction Biocatalyst Superior to Platinum and a Biofuel Cell Operating at 0.88 V

---

Catalysis of the electroreduction of O2 to water determines the operating voltage and thereby the efficiency of the cathode in air batteries, the prime example of which is the zinc air battery, and in fuel cells, the best-studied examples of which are the methanol/air and the H2/O2 cells. When the current density is not limited by O2 transport, the better the catalyst, the less the voltage loss for a cathode operating at a given current density. In the language of electrochemistry, the voltage loss is termed polarization or overvoltage. It is the excess voltage must be applied over the reversible potential of the O2/H2O half-cell in order to maintain the desired true current density, which is the current per unit true surface area,
taking into account the surface topography or roughness, distinguished from the geometrical, or engineering, surface area. In engineered batteries or fuel cells, the ratio of the geometrical and true surface area is high. The specific surface of the platinum loaded carbon particles of fuel cell O2 diffusion electrodes is >100 m2/g. The Pt weight fraction in the catalyst is 0.05, and  100 íg cm-2 of Pt is loaded on their O2 cathodes.1 The engineering/true surface area ratio of these cathodes is 2  103, providing an engineering
current density of 1 A cm-2 in H2/O2 or methanol/air fuel cells, when the true current density is about

---

Ketersediaan

Tidak ada salinan data

Informasi Detail

Judul Seri

J. AM. CHEM. SOC.

No. Panggil

-

Penerbit

Washington, DC : American Chemical Society., 2004

Deskripsi Fisik

J. AM. CHEM. SOC. 2004, 126, 8368-8369

Bahasa

English

ISBN/ISSN

-

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

KIMIA

Info Detail Spesifik

-

Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

Komentar

---

Anda harus masuk sebelum memberikan komentar