Re-Investigation of Cobalt Porphyrin for Electrochemical Water Oxidation on FTO Surface: Formation of CoOx as Active Species

被引：70

作者：

Daniel, Quentin ^{[1
]}

Anabre, Ram B. ^{[1
]}

Zhang, Biaobiao ^{[1
]}

Philippe, Bertrand ^{[2
]}

Chen, Hong ^{[1
]}

Li, Fusheng ^{[1
]}

Fan, Ke ^{[1
]}

Ahmadi, Sareh ^{[2
]}

Rensmo, Hakan ^{[2
]}

Sun, Licheng ^{[1
,3
]}

机构：

[1] KTH Royal Inst Technol, Sch Chem Sci & Engn, Dept Chem, S-10044 Stockholm, Sweden

[2] Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden

[3] Dalian Univ Technol, State Key Lab Fine Chem, DUT KTH Joint Educ & Res Ctr Mol Devices, Dalian 116024, Peoples R China

来源：

ACS CATALYSIS | 2017年 / 7卷 / 02期

基金：

瑞典研究理事会; 中国国家自然科学基金;

关键词：

water oxidation; cobalt oxide; decomposition; surface characterization; thin film; RAY PHOTOELECTRON-SPECTROSCOPY; ASTERISK IRIDIUM COMPLEXES; GLASSY-CARBON; EFFICIENT CATALYSTS; MOLECULAR CATALYST; MANGANESE; ELECTRODE; EVOLUTION; DIMER; ELECTROCATALYST;

D O I：

10.1021/acscatal.6b01815

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The use of cobalt porphyrin complexes as efficient and cost-effective molecular catalysts for water oxidation has been investigated previously. However, by combining a set of analytical techniques (electrochemistry, ultraviolet-visible spectroscopy (UV-vis), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and synchrotron-based photoelectron spectroscopy (SOXPES and HAXPES)), we have demonstrated that three different cobalt porphyrins, deposited on FTO glasses, decompose promptly into a thin film of CoOx on the surface of the electrode during water oxidation under certain conditions (borate buffer pH 9.2). It is presumed that the film is composed of CoO, only detectable by SOXPES, as conventional techniques are ineffective. This newly formed film has a high turnover frequency (TOF), while the high transparency of the CoOx-based electrode is very promising for future application in photoelectrochemical cells.

引用

页码：1143 / 1149

页数：7

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