Interfacial nitrogen modulated Z-scheme photoanode for solar water oxidation

Zhang，Shanshan1,2; Xing，Zheng3; Ma，Ming2; Liu，Zhenghao4; Tang，Wei2; Kim，Sungsoon5; Wu，Rong1; Li，Jiangyu4; Park，Jong Hyeok5

2022-01-31

10.1016/j.jpowsour.2021.230784

JOURNAL OF POWER SOURCES   影响因子和分区

0378-7753

1873-2755

The fabrication of heterojunctions with an appropriate energy band alignment is an attractive strategy to achieve highly efficient solar water splitting. Despite unique advantages, conventional type II heterojunctions face the problem of a relatively low redox power of the charge carriers. Although Z-scheme systems can overcome this problem, their introduction to photoelectrochemical (PEC) devices is challenging due to the specific band alignment. Herein, as an example, an ultrathin MoON layer is deposited on the surface of TiO nanoarrays via an in situ conversion process, and the optimized MoON/TiO sample generates a photocurrent density that is approximately 2.4 times that for pure TiO. In addition, a similar surface modification leads to 2.5- and 2.6-fold higher photocurrent values for BiVO and WO nanostructures, respectively. Interestingly, the impedance of the MoON/TiO photoanode is larger than that of the pure TiO in the dark, while illumination reverses the trend. This phenomenon, combined with the measured flat band positions, suggests a Z-scheme mechanism, which is further supported by surface potential measurements. The nitrogen (N) atoms play a major role in the boosted photoconversion efficiency for the MoON/TiO Z-scheme heterojunction, not only enhancing the light sensitivity but, importantly, substantially promoting charge separation.

KPFM MoOxNy Photoanode Solar water oxidation Z-scheme heterojunction

SCI ; EI

英语

通讯

NRF Korea[2019R1A2C3010479] ; National Natural Science Foundation of China[21905298,31700835,22066024] ; Guangdong Basic and Applied Basic Research Foundation[2020A1515010342] ; Shenzhen Science and Technology Innovation Committee["JCYJ20190807164205542","JCYJ20190807164803603"] ; Instrument Developing Project of Chinese Academy of Sciences[ZDKYYQ20180004]

Chemistry ; Electrochemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Electrochemistry ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000723567200004

ELSEVIER

20214811225923

Bismuth compounds ; Nitrogen ; Photoelectrochemical cells ; Titanium dioxide ; Tungsten compounds

Electric Batteries:702.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2

MATERIALS SCIENCE

2-s2.0-85119623014

Scopus

1.School of Physics Science and Technology,Xinjiang University,Urumqi,830046,China
2.Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen,518055,China
3.School of Chemical Engineering and Technology,Sun Yat-sen University,Zhuhai,519082,China
4.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
5.Department of Chemical and Biomolecular Engineering,Yonsei University,Seoul,50 Yonsei‐ro, Seodaemun‐gu,03722,South Korea

Zhang，Shanshan,Xing，Zheng,Ma，Ming,et al. Interfacial nitrogen modulated Z-scheme photoanode for solar water oxidation[J]. JOURNAL OF POWER SOURCES,2022,519.

Zhang，Shanshan.,Xing，Zheng.,Ma，Ming.,Liu，Zhenghao.,Tang，Wei.,...&Park，Jong Hyeok.(2022).Interfacial nitrogen modulated Z-scheme photoanode for solar water oxidation.JOURNAL OF POWER SOURCES,519.

Zhang，Shanshan,et al."Interfacial nitrogen modulated Z-scheme photoanode for solar water oxidation".JOURNAL OF POWER SOURCES 519(2022).