Highly Defective Layered Double Perovskite Oxide for Efficient Energy Storage via Reversible Pseudocapacitive Oxygen‐Anion Intercalation

Abstract

The use of perovskite materials as anion-based intercalation pseudocapacitor electrodes has received significant attention in recent years. Notably, these materials, characterized by high oxygen vacancy concentrations, do not require high surface areas to achieve a high energy storage capacity as a result of the bulk intercalation mechanism. Here we report that reduced PrBaMn 2 O 6- (r-PBM), possessing a layered double perovskite structure, exhibits ultrahigh capacitance and functions as an excellent oxygen anion-intercalation-type electrode material for supercapacitors.Formation of the layered double perovskite structure, as facilitated by hydrogen treatment, is shown to significantly enhance the capacitance, with the resulting r-PBM material demonstrating a very high gravimetric capacitance of 1034.8 F g -1 and an excellent volumetric capacitance of approximately 2535.3 F cm -3 at a current density of 1 A g -1 . The resultant formation of a double perovskite crystal oxide with a specific layered structure leads to the r-PBM with a substantially higher oxygen diffusion rate and oxygen vacancy concentration. These superior characteristics show immense promise for their application as oxygen anion-intercalation-type electrodes in pseudocapacitors.

Progress of Lead‐Free Halide Double Perovskites

“…Addressing the toxicity issues in these compounds by a careful and strategic replacement of Pb 2+ with other nontoxic candidate elements represents a promising direction to fabricate lead-free optoelectronic devices. [63][64][65][66][67][68][69][70][71] Their amazing properties, including paramagnetism, [69,70] ferromagnetism, [71] and magnetoresistance, [68] have exhibited successful application in the preparation of various metallic materials. Here, the authors present the current progress and setbacks in crystal structures, materials preparation, optoelectronic properties, stability, and photovoltaic applications of lead-free halide double perovskite compounds.…”

Fabrication of a Mo‐Doped Strontium Cobaltite Perovskite Hybrid Supercapacitor Cell with High Energy Density and Excellent Cycling Life

“…[18][19][20] Several approaches have been exploredb yr esearchers in this regard. [21][22] Of the different perovskite oxides, it is observed that strontium cobaltite in cubic phase (SrCoO 3Àd , SC) exhibits high electrical conductivity in addition to oxygen permeation flux at elevated temperatures in solid oxide fuel cells (SOFCs).H owever,t his phase is not stable at room temperature and studies revealed that as mall amount of doping at the Bs ite is favorable to stabilize the phase and maintain ah igh oxygen vacancy concentration. [18] Cao et al synthesized Sr-doped LaNiO 3 and discussedt he role of doping low valence metal ions in furthering oxygen vacancies for improving the charge storagec haracteristics.…”

“…[19] An essential criterion of such intercalated/de-intercalated phenomenono bservedi n perovskite oxidesi st he phase transition, which should not take place during the prevailing electrochemical reaction in supercapacitors as found in Li-ion based battery materials. [21][22] Of the different perovskite oxides, it is observed that strontium cobaltite in cubic phase (SrCoO 3Àd , SC) exhibits high electrical conductivity in addition to oxygen permeation flux at elevated temperatures in solid oxide fuel cells (SOFCs).H owever,t his phase is not stable at room temperature and studies revealed that as mall amount of doping at the Bs ite is favorable to stabilize the phase and maintain ah igh oxygen vacancy concentration. [23,24] In this context, Nagai et al have demonstratedt hat doping at the B site with cations with ah ighv alences tate augments the oxygen vacancy concentration and at the same time restores the structurali ntegrity.…”

Recent Advances in Novel Nanostructuring Methods of Perovskite Electrocatalysts for Energy‐Related Applications

“…Moreover, a variety of perovskite derivatives including double perovskite, layered perovskite, quadruple perovskite, and others add to the diversity of the perovskite family. Such flexibility in composition and structure gives rise to the tunable electronic structure of perovskites, exhibiting diverse physical and chemical properties that can meet the need of a myriad of applications, such as heterogeneous catalysis, photocatalysis, wastewater treatment, oxygen permeation membranes, supercapacitors, and sensors . Until recently, their applications toward electrocatalysis have attracted growing attention worldwide.…”