2020
DOI: 10.1002/aenm.201903128
|View full text |Cite
|
Sign up to set email alerts
|

Fundamental Insights from a Single‐Crystal Sodium Iridate Battery

Abstract: Electrochemically driven chemical transformations play the key role in controlling storage of energy in chemical bonds and subsequent conversion to power electric vehicles and consumer electronics. The promise of coupling anionic oxygen redox with cationic redox to achieve a substantial increase in capacities has inspired research in a wide range of electrode materials. A key challenge is that these studies have focused on polycrystalline materials, where it is hard to perform precise structural determinations… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

2
13
0

Year Published

2021
2021
2024
2024

Publication Types

Select...
6

Relationship

0
6

Authors

Journals

citations
Cited by 11 publications
(15 citation statements)
references
References 33 publications
2
13
0
Order By: Relevance
“…10,[34][35][36] In fact, the exact same materials are often under study by the two communities at the same time. 10,37,38 At the outset it is also worth noting that, although materials such as iridates have so far been the most popular for studies of d electrons with strong spin-orbit coupling, it is not only oxides that host such states but also e.g. halides 16 and intermetallics, 39 and in addition to compounds of the platinum group metals that we focus on there are a growing number of materials based on other 5d elements, such as rhenium and tantalum.…”
Section: Introductionmentioning
confidence: 99%
“…10,[34][35][36] In fact, the exact same materials are often under study by the two communities at the same time. 10,37,38 At the outset it is also worth noting that, although materials such as iridates have so far been the most popular for studies of d electrons with strong spin-orbit coupling, it is not only oxides that host such states but also e.g. halides 16 and intermetallics, 39 and in addition to compounds of the platinum group metals that we focus on there are a growing number of materials based on other 5d elements, such as rhenium and tantalum.…”
Section: Introductionmentioning
confidence: 99%
“…[ 152 ] Tepavcevic et al. [ 153 ] argued that the excess capacity of ordered single crystal Na 2‐ x IrO 3 can be attributed to neither Ir 5+ /Ir 6+ redox nor the pronounced change in the bulk oxygen oxidation reaction plausibly caused by impurities that inevitably populated the surface and interface of the material or other electrolyte contributions; thus, the additional capacity (120 mAh g −1 ) immediately disappears. During charging, Na 2 IrO 3 comprising two Na ions in the Na layer of the IrO 6 octahedral honey lattice changes to the Na 3 Ir 2 O 6 structure and then to O1‐type NaIrO 3 (Figure 7e,f).…”
Section: Anionic Redox In Sodium‐layered Oxide Cathode Materialsmentioning
confidence: 99%
“…Other helpful methods include XANES, EXAFS, sXAS, and hard XAS. Most reports have used XAS to characterize the electronic structures of cations and anions, such as NaMn 1/3 Fe 1/3 Ni 1/3 O 2 , [ 183 ] Na 2‐ x IrO 3 , [ 153 ] and Na 2/3 Mg 1/3 Mn 2/3 O 2 [ 114 ] EELS, which can be adapted to demonstrate electronic states, atomic compositions, surface properties, and chemical bonding of oxygen, is used to probe light elements. Similar to the XAS technique, O K‐edge EELS pre‐edge peaks reflect the oxidation number of oxygen ions.…”
Section: Summary and Prospectsmentioning
confidence: 99%
“…The formation of the unstable O 1 ‐type Na x IrO 3 results in structural distortion when more than 1.5 Na + ions are extracted (Figure 7A). However, only the Ir 4+ /Ir 5+ redox is involved in the highly ordered single‐crystal Na 2 IrO 3 107 . The capacity fading in the single‐crystal Na 2 IrO 3 is correlated with the Na + ions migration, resulting in the formation of O 3 ‐type Na 1 IrO 3 (Figure 7B).…”
Section: Configuration‐dependent Anionic Redoxmentioning
confidence: 99%
“…Structural evolution during Na extraction from the single‐crystal Na 2 IrO 3 (B) 107 . Reproduced with permission 107 . Copyright 2020, Wiley‐VCH…”
Section: Configuration‐dependent Anionic Redoxmentioning
confidence: 99%