[vc_empty_space][vc_empty_space]
Self-templated fabrication of hierarchical hollow manganese-cobalt phosphide yolk-shell spheres for enhanced oxygen evolution reaction
Kaneti Y.V.a, Guo Y.a, Septiani N.L.W.b, Iqbal M.a,b, Jiang X.c, Takei T.a, Yuliarto B.b, Alothman Z.A., Golberg D.a,e, Yamauchi Y.a,f,g
a International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, 305-0044, Japan
b Advanced Functional Materials (AFM) Laboratory, Department of Engineering Physics, Institut Teknologi Bandung, Bandung, 40132, Indonesia
c Department of Chemical Engineering, Monash University, Clayton, 3800, Australia
d Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
e Centre for Materials Science and School of Chemistry and Physics, Queensland University of Technology (QUT), Brisbane, 4000, Australia
f School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, 4072, Australia
g Department of Plant and Environmental New Resources, Kyung Hee University, Yongin-si, 446-701, South Korea
[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]© 2020 Elsevier B.V.Hierarchical nanostructures with hollow architectures can provide rich active sites, improved transport of ions, and highly robust structure for electrochemical applications. In this work, we report the self-templated fabrication of hierarchical manganese-cobalt phosphide (Mn-Co phosphide) yolk-shell spheres using highly uniform cobalt glycerate spheres as sacrificial templates. Through a simple exchange reaction with the manganese precursor solution at room temperature, these cobalt glycerate spheres are readily converted to hierarchical Mn-Co LDH yolk-shell spheres, which can be further phosphidized at 350 °C under inert atmosphere to generate hierarchical Mn-Co phosphide with distinct yolk-shell morphology. When tested as an electrocatalyst for oxygen evolution reaction (OER), the hierarchical Mn-Co phosphide yolk-shell spheres exhibit an overpotential of 330 mV at a current density of 10 mA cm−2 and a Tafel slope of 59.0 mV dec-1, which are higher than those of Mn-Co oxide yolk-shell spheres (480 mV and 113 mV dec-1) and hierarchical cobalt phosphide spheres (410 mV and 61.3 mV dec-1). Post-OER analysis by XPS reveals that the high activity of the hierarchical Mn-Co phosphide yolk-shell catalyst originates from the existence of Mn4+/Mn3+ and Co2+/Co3+ redox couples and the formation of active metal oxyhydroxide species on its surface. The proposed self-sacrificial templating strategy will provide useful guidance for future construction of hollow inorganic metal nanostructures with yolk-shell morphology for energy storage and conversion applications.[/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]Electrochemical applications,Energy storage and conversions,Hierarchical Nanostructures,Oxygen evolution reaction (oer),Sacrificial templates,Sacrificial templating,Templated fabrication,Yolk-shell catalysts[/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]Electrocatalysis,Energy conversion,Hierarchical nanosheets,Metal oxides,Metal phosphides,Oxygen evolution reaction[/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][{‘$’: ‘This work was funded by the Researchers Support Project No. (RSP-2020/1) King Saud University , Riyadh, Saudi Arabia. D.G. is grateful to the ARC for granting a Laureate Fellowship ( FL160100089 ) and to QUT projects Nos. 323000-0355/51 and 323000-0348/07 . The authors thank Dr. Akio Iwanade at the Materials Analysis Station at NIMS for the ICP analysis. The authors are also grateful to Dr. Bin Gong at the Mark Wainwright Analytical Centre (The University of New South Wales ) for the XPS measurements. This work was performed in part at the Queensland node of the Australian National Fabrication Facility , a company established under the National Collaborative Research Infrastructure Strategy to provide nano and microfabrication facilities for Australia’s researchers.’}, {‘$’: “This work was funded by the Researchers Support Project No. (RSP-2020/1) King Saud University, Riyadh, Saudi Arabia. D.G. is grateful to the ARC for granting a Laureate Fellowship (FL160100089) and to QUT projects Nos. 323000-0355/51 and 323000-0348/07. The authors thank Dr. Akio Iwanade at the Materials Analysis Station at NIMS for the ICP analysis. The authors are also grateful to Dr. Bin Gong at the Mark Wainwright Analytical Centre (The University of New South Wales) for the XPS measurements. This work was performed in part at the Queensland node of the Australian National Fabrication Facility, a company established under the National Collaborative Research Infrastructure Strategy to provide nano and microfabrication facilities for Australia’s researchers.”}][/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/10.1016/j.cej.2020.126580[/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]