TY - JOUR
T1 - Dumbbell-Shaped Ternary Transition-Metal (Cu, Ni, Co) Phosphate Bundles
T2 - A Promising Catalyst for the Oxygen Evolution Reaction
AU - Singh, Harjinder
AU - Biswas, Rathindranath
AU - Ahmed, Imtiaz
AU - Thakur, Pooja
AU - Kundu, Avinava
AU - Panigrahi, Abhishek Ramachandra
AU - Banerjee, Biplab
AU - Halder, Krishna Kamal
AU - Lahtinen, Jouko
AU - Mondal, Krishnakanta
AU - Haldar, Krishna Kanta
N1 - Funding Information:
This work was financially supported by the Department of Science and Technology (DST), Government of India. H.S. and I.A. thank CSIR for awarding a fellowship. R.B. is thankful to the DST for providing an INSPIRE fellowship for the Ph.D. program (DST/INSPIRE Fellowship/[IF190052]). A.K. acknowledges the DST INSPIRE SHE scholarship (Registration Number: 201500043384). We acknowledge the provision of facilities of Aalto University at OtaNano-Nanomicroscopy Center (Aalto-NMC). K.M. acknowledges the support and the resources provided by ‘PARAM Shivay Facility’ under the National Supercomputing Mission, Government of India at the Indian Institute of Technology, Varanasi. K.M. also acknowledges DST for funding (DST/INSPIRE/04/2018/002482). This paper was written through contributions of all authors.
Publisher Copyright:
©
PY - 2022/2/9
Y1 - 2022/2/9
N2 - Development of economical and high-performance electrocatalysts for the oxygen evolution reaction (OER) is of tremendous interest for future applications as sustainable energy materials. Here, a unique member of efficient OER electrocatalysts has been developed based upon structurally versatile dumbbell-shaped ternary transition-metal (Cu, Ni, Co) phosphates with a three-dimensional (3D) (Cu2(OH)(PO4)/Ni3(PO4)2·8H2O/Co3(PO4)2·8H2O) (CNCP) structure. This structure is prepared using a simple aqueous stepwise addition of metal ion source approach. Various structural investigations demonstrate highly crystalline nature of the composite structure. Apart from the unique structural aspect, it is important that the CNCP composite structure has proved to be an excellent electrocatalyst for OER performance in comparison with its binary or constituent phosphate under alkaline and neutral conditions. Notably, the CNCP electrocatalyst displays a much lower overpotential of 224 mV at a current density of 10 mA cm-2 and a lower Tafel slope of 53 mV dec-1 with high stability in alkaline medium. In addition, X-ray photoelectron spectroscopy analysis suggested that the activity and long-term durability for the OER of the ternary 3D metal phosphate are due to the presence of electrochemically dynamic constituents such as Ni and Co and their resulting synergistic effects, which was further supported by theoretical studies. Theoretical calculations also reveal that the incredible OER execution was ascribed to the electron redistribution set off in the presence of Ni and Cu and the most favorable interaction between the *OOH intermediate and the active sites of CNCP. This work may attract the attention of researchers to construct efficient 3D ternary metal phosphate catalysts for various applications in the field of electrochemistry.
AB - Development of economical and high-performance electrocatalysts for the oxygen evolution reaction (OER) is of tremendous interest for future applications as sustainable energy materials. Here, a unique member of efficient OER electrocatalysts has been developed based upon structurally versatile dumbbell-shaped ternary transition-metal (Cu, Ni, Co) phosphates with a three-dimensional (3D) (Cu2(OH)(PO4)/Ni3(PO4)2·8H2O/Co3(PO4)2·8H2O) (CNCP) structure. This structure is prepared using a simple aqueous stepwise addition of metal ion source approach. Various structural investigations demonstrate highly crystalline nature of the composite structure. Apart from the unique structural aspect, it is important that the CNCP composite structure has proved to be an excellent electrocatalyst for OER performance in comparison with its binary or constituent phosphate under alkaline and neutral conditions. Notably, the CNCP electrocatalyst displays a much lower overpotential of 224 mV at a current density of 10 mA cm-2 and a lower Tafel slope of 53 mV dec-1 with high stability in alkaline medium. In addition, X-ray photoelectron spectroscopy analysis suggested that the activity and long-term durability for the OER of the ternary 3D metal phosphate are due to the presence of electrochemically dynamic constituents such as Ni and Co and their resulting synergistic effects, which was further supported by theoretical studies. Theoretical calculations also reveal that the incredible OER execution was ascribed to the electron redistribution set off in the presence of Ni and Cu and the most favorable interaction between the *OOH intermediate and the active sites of CNCP. This work may attract the attention of researchers to construct efficient 3D ternary metal phosphate catalysts for various applications in the field of electrochemistry.
KW - bundle
KW - dumbbell-shaped
KW - electrocatalyst
KW - OER
KW - ternary phosphate
UR - http://www.scopus.com/inward/record.url?scp=85124156946&partnerID=8YFLogxK
U2 - 10.1021/acsami.1c20356
DO - 10.1021/acsami.1c20356
M3 - Article
C2 - 35084167
AN - SCOPUS:85124156946
SN - 1944-8244
VL - 14
SP - 6570
EP - 6581
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 5
ER -