TY - JOUR
T1 - Unique structure-induced magnetic and electrochemical activity in nanostructured transition metal tellurates Co1 - XNi xTeO4(x = 0, 0.5, and 1)
AU - Patel, Akhilesh Kumar
AU - Panda, Manas Ranjan
AU - Rani, Ekta
AU - Singh, Harishchandra
AU - Samatham, S. Shanmukharao
AU - Nagendra, Abharana
AU - Jha, Sambhu Nath
AU - Bhattacharyya, Dibyendu
AU - Suresh, Krishnawarrier G.
AU - Mitra, Sagar
PY - 2020/8/11
Y1 - 2020/8/11
N2 - The emergence of cutting-edge nanomaterials with rational design, primarily with a structure-driven functionality, is a prerequisite for achieving advancement in current energy scenarios. This report presents facile sol-gel-grown, first-of-its-kind, nanostructured transition metal tellurates Co1 - xNixTeO4 (x = 0, 0.5, and 1). These are a class of promising magnetic and energy storage materials. Along with electronic structure signatures of individual nanocrystals through electron energy loss spectroscopy, microstructural and high-resolution synchrotron X-ray diffraction analysis results in a new structural model, which further sheds light on the structure-driven performances of these tellurates. Antiferromagnetic interactions observed at ∼48, 58, and 76 K for x = 0, 0.5, and 1, respectively, surpass numerous antiferromagnets. The robust electrochemical activity of NiTeO4 against Li metal shows a high reversible specific capacity of ∼1271 mA h g-1 in the first discharge cycle, with 80% capacity retention over long-term cycles. Thorough ex situ X-ray absorption fine-structure spectroscopy and transmission electron microscopy investigations performed on several charging/discharging cycled electrodes establish a conversion-based battery reaction mechanism. The resulting anode, thus, displays unprecedentedly high stability in comparison to existing transition metal-based anode materials for Li-ion batteries. The observed outcomes are further understood to stem from different degrees of the Jahn-Teller-like z-out and z-in distortion in the respective d orbitals of Co2+ and Ni2+.
AB - The emergence of cutting-edge nanomaterials with rational design, primarily with a structure-driven functionality, is a prerequisite for achieving advancement in current energy scenarios. This report presents facile sol-gel-grown, first-of-its-kind, nanostructured transition metal tellurates Co1 - xNixTeO4 (x = 0, 0.5, and 1). These are a class of promising magnetic and energy storage materials. Along with electronic structure signatures of individual nanocrystals through electron energy loss spectroscopy, microstructural and high-resolution synchrotron X-ray diffraction analysis results in a new structural model, which further sheds light on the structure-driven performances of these tellurates. Antiferromagnetic interactions observed at ∼48, 58, and 76 K for x = 0, 0.5, and 1, respectively, surpass numerous antiferromagnets. The robust electrochemical activity of NiTeO4 against Li metal shows a high reversible specific capacity of ∼1271 mA h g-1 in the first discharge cycle, with 80% capacity retention over long-term cycles. Thorough ex situ X-ray absorption fine-structure spectroscopy and transmission electron microscopy investigations performed on several charging/discharging cycled electrodes establish a conversion-based battery reaction mechanism. The resulting anode, thus, displays unprecedentedly high stability in comparison to existing transition metal-based anode materials for Li-ion batteries. The observed outcomes are further understood to stem from different degrees of the Jahn-Teller-like z-out and z-in distortion in the respective d orbitals of Co2+ and Ni2+.
KW - energy storage and magnetism
KW - LIB anode
KW - nanocrystals
KW - polyhedral distortion
KW - transition metal tellurates
UR - http://www.scopus.com/inward/record.url?scp=85094841008&partnerID=8YFLogxK
U2 - 10.1021/acsaem.0c01871
DO - 10.1021/acsaem.0c01871
M3 - Article
AN - SCOPUS:85094841008
VL - 3
SP - 9436
EP - 9448
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
SN - 2574-0962
IS - 9
ER -