[vc_empty_space][vc_empty_space]
Tailorable nanoarchitecturing of bimetallic nickel-cobalt hydrogen phosphate: Via the self-weaving of nanotubes for efficient oxygen evolution
Septiani N.L.W.a, Kaneti Y.V.b,c,d, Fathoni K.B.a, Guo Y.c, Ide Y.c, Yuliarto B.a, Jiang X.e, Nugraha N.a, Dipojono H.K.a, Golberg D.c,f, Yamauchi Y.b,d,g
a Advanced Functional Materials Laboratory, Computational Materials Design and Quantum Engineering Laboratory, Department of Engineering Physics, Institut Teknologi Bandung (ITB), Bandung, 40132, Indonesia
b Key Laboratory of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
c International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, 305-0044, Japan
d School of Chemical Engineering, Australian Institute for Bioengineering and Nanotechnology (AIBN), University of Queensland, Brisbane, 4072, Australia
e Department of Chemical Engineering, Monash University, Clayton, 3800, Australia
f Centre for Materials Science, School of Chemistry and Physics, Science and Engineering Faculty, Queensland University of Technology (QUT), Brisbane, 4000, Australia
g Department of Plant and Environmental New Resources, Kyung Hee University, Yongin-si Gyeonggi-do, 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]This journal is © The Royal Society of Chemistry.This study demonstrates the tailorable self-weaving of bimetallic nickel-cobalt (Ni-Co) hydrogen phosphate nanotubes into one-dimensional (1D) microspindles or two-dimensional (2D) sheet-like structures by utilizing monodispersed Ni-Co glycerate spheres as sacrificial templates. The conversion process is achieved through a two-step solvothermal method in the presence of phosphoric acid (H3PO4) as a phosphorus source and promoter of the self-weaving process. The formation of such nanotube-assembled architectures is promoted by the “peeling-self-weaving” mechanism, in which the bimetallic Ni-Co hydrogen phosphate nanotubes initially grow on the surface of the Ni-Co glycerate spheres due to the reactions between Ni and Co metals bonded to the glycerate anions with hydrogen phosphate anions present in the solution. This is followed by the peeling of the overgrown nanotubes from the etched glycerate spheres and their self-weaving into 1D or 2D architectures depending on the Ni/Co molar ratio. The electrocatalytic test results reveal the superior activity of the Ni-rich Ni-Co hydrogen phosphate electrode for oxygen evolution reaction (OER) compared to its Co-rich and equimolar counterparts, leading to smaller overpotential of 320 mV and lower Tafel slope of 84 mV dec-1. Post-OER analysis of this sample reveals that the high OER activity is derived from the formation of active Ni-Co oxyhydroxide phase on its surface.[/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]Conversion process,Hydrogen phosphates,Oxygen evolution reaction (oer),Phosphorus sources,Sacrificial templates,Sheet-like structure,Solvothermal method,Two Dimensional (2 D)[/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][/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 research work was nancially supported by Australian Research Council (ARC) Future Fellowship (FT150100479). D. G. is grateful to the Australian Research Council (ARC) for granting a Laureate Fellowship (FL160100089) and to QUT (Project No. 322170-0355/51 and 322170-0348/07). The authors also acknowledge the nancial grant provided by the Indonesian Ministry of Research, Technology, and Higher Education (RIS-TEK-DIKTI) under the World Class University (WCU) program managed by Institut Teknologi Bandung (ITB). In addition, the authors also acknowledge additional funding provided by RIS-TEK-DIKTI and ITB. N. L. W. S. acknowledges the support from the International Cooperative Graduate Program (ICGP) during her stay at NIMS, Japan. The authors thank Bill Gong from the UNSW Mark Wainwright Analytical Center for the XPS measurements. This work was partly performed at the Queensland node of the Australian National Fabrication Facility (ANFF), a company established under the National Collaborative Research Infrastructure Strategy to provide nano and microfabrication facilities for Australian 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/10.1039/c9ta13442e[/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]