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Cobalt‐Phosphate‐Assisted Photoelectrochemical Water Oxidation by Arrays of Molybdenum‐Doped Zinc Oxide Nanorods
Author(s) -
Lin YanGu,
Hsu YuKuei,
Chen YingChu,
Lee BingWei,
Hwang JihShang,
Chen LiChyong,
Chen KueiHsien
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402025
Subject(s) - nanorod , cobalt , zinc , molybdenum , doping , materials science , inorganic chemistry , cobalt oxide , phosphate , water splitting , oxide , chemistry , chemical engineering , nanotechnology , photocatalysis , catalysis , metallurgy , organic chemistry , engineering , biochemistry , optoelectronics
We report the first demonstration of cobalt phosphate (Co‐Pi)‐assisted molybdenum‐doped zinc oxide nanorods (Zn 1− x Mo x O NRs) as visible‐light‐sensitive photofunctional electrodes to fundamentally improve the performance of ZnO NRs for photoelectrochemical (PEC) water splitting. A maximum photoconversion efficiency as high as 1.05 % was achieved, at a photocurrent density of 1.4 mA cm −2 . More importantly, in addition to achieve the maximum incident photon to current conversion efficiency (IPCE) value of 86 %, it could be noted that the IPCE of Zn 1− x Mo x O photoanodes under monochromatic illumination (450 nm) is up to 12 %. Our PEC performances are comparable to those of many oxide‐based photoanodes in recent reports. The improvement in photoactivity of PEC water splitting may be attributed to the enhanced visible‐light absorption, increased charge‐carrier densities, and improved interfacial charge‐transfer kinetics due to the combined effect of molybdenum incorporation and Co‐Pi modification, contributing to photocatalysis. The new design of constructing highly photoactive Co‐Pi‐assisted Zn 1− x Mo x O photoanodes enriches knowledge on doping and advances the development of high‐efficiency photoelectrodes in the solar‐hydrogen field.