Electrocatalytic Water Oxidation at Neutral pH by a Nanostructured Co(PO3)2 Anode

被引：226

作者：

Ahn, Hyun S. ^{[1
,2
]}

Tilley, T. Don ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA

来源：

ADVANCED FUNCTIONAL MATERIALS | 2013年 / 23卷 / 02期

关键词：

catalysis; electrodes; ceramics; nanoparticles; OXYGEN-EVOLVING CATALYST; COLLOIDAL IRIDIUM OXIDE; TERT-BUTYL PHOSPHATE; COBALT OXIDE; DI(TERT-BUTYL)PHOSPHATE COMPLEXES; HETEROGENEOUS CATALYSTS; MULTICOMPONENT OXIDES; MOLECULAR PRECURSORS; MESOPOROUS SILICA; NONPOLAR MEDIA;

D O I：

10.1002/adfm.201200920

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Cobalt metaphosphate Co(PO3)2 nanoparticles are prepared via the thermolytic molecular precursor (TMP) method. A Ni form electrode decorated with Co(PO3)2 nanoparticles is evaluated as an anode for water oxidation electrocatalysis in pH 6.4 phosphate-buffered water. Catalytic onset occurs at an overpotential of ca. 310 mV, which is 100 mV lower than that observed for Co3O4 nanoparticles, with a comparable surface area under identical conditions. A per-metal turnover frequency (TOF) of 0.100.21 s-1 is observed at an overpotential, ?, of 440 mV, which is comparable to the highest rate reported for a first-row metal heterogeneous catalyst. Post-catalytic characterization of the catalyst resting state by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy reveals that surface rearrangement occurs, resulting in an oxide-like surface overlayer.

引用

页码：227 / 233

页数：7

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