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The Dependence of Bi2MoO6 Photocatalytic Water Oxidation Capability on Crystal Facet Engineering
Wu X.a, Ng Y.H.b, Saputera W.H.c, Wen X.d, Du Y.e, Dou S.X.e, Amal R.a, Scott J.a
a Particles and Catalysis Research Group School of Chemical Engineering, The University of New South Wales, Sydney, 2052, Australia
b School of Energy and Environment, City University of Hong Kong Kowloon, Hong Kong
c Department of Chemical Engineering Faculty of Industrial Technology, Institut Teknologi Bandung, Bandung, 40132, Indonesia
d Centre for Micro-Photonics Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, 3122, Australia
e Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong, 2525, Australia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, WeinheimCrystal facet engineering of semiconductor photocatalysts is regarded as an emerging strategy to tune their physicochemical properties and optimize the photoreactivity of the materials. In this work, two plate-like Bi2MoO6 samples were prepared, dominant in either the distinctly different {100} or {010} facets. As a consequence of the electronic structure effects induced by the facets, the {100}-dominant Bi2MoO6 (100-BMO) possessed a smaller band gap and delivered a much higher photocatalytic water oxidation activity than {010}-dominant Bi2MoO6 (010-BMO). A greater charge carrier density in 100-BMO was found to promote electron accumulation on the {100} surfaces, leading to the narrower band gap, as supported by Mott-Schottky measurements. Efficient intrinsic electron-hole separation and longer charge carrier lifetimes in 100-BMO were also observed. Further, a higher photocurrent density and smaller Nyquist plot arc radius presented by 100-BMO imply a higher charge transfer capacity. EPR analysis indicated that the 100-BMO boasted a higher oxygen vacancy density, whereby the vacancies could serve as shallow donors to trap electrons and suppress photogenerated electron-hole pair recombination. Overall, the {100} facet in Bi2MoO6 delivered a mix of distinctly advantageous characteristics relative to the {010} facet with the findings clearly illustrating the value of crystal facet engineering in boosting photocatalytic performance.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Bi2MoO6,charge carriers,crystal facets,photocatalysis,water oxidation[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][{‘$’: ‘This work was financially supported by the Australian Research Council Discovery Project (DP140102581). We thank the UNSW Mark Wainwright Analytical Centre for providing access to their facilities. The authors also acknowledge support from the UOW Electron Microscopy Centre.’}, {‘$’: ‘This work was financially supported by the Australian Research Council Discovery Project (DP140102581). We thank the UNSW Mark Wainwright Analytical Centre for providing access to their facilities. The authors also acknowledge support from the UOW Electron Microscopy Centre.’}][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1002/cptc.201900113[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]