Electrochemical Phase Transformations
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Phase transformations in one-dimensional materials: applications in electronics and energy sciences
Phase transformations at the nanoscale display interesting and important differences from those which occur in the bulk of most materials systems. These differences occur in a large variety of transformations, including melting, solid state phase transformation, chemical ordering and disordering, and chemical and electrochemical transformations. They arise from both the thermodynamic contributi...
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The process of reductive dissolution of α-Fe2O3, Ba-hexaferrite, α-FeOOH, γ-Fe2O3, γ-FeOOH, and ferrihydrite can be monitored continuously by abrasive stripping voltammetry and chronoamperometry to obtain information about homogeneity of reactivity and about the particle size of the pure phases and mixtures. Phase parameters (rate constant and charge transfer coefficient) and the geometrical fa...
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The ion-intercalation materials used in high-energy batteries such as lithium-ion undergo large composition changes–which correlate to high storage capacity—but which also induce structural changes and stresses that can cause performance metrics such as power, achievable storage capacity, and life to degrade. “Electrochemical shock”–the electrochemical cyclinginduced fracture of materials–contr...
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In situ techniques with high temporal, spatial and chemical resolution are key to understand ubiquitous solid-state phase transformations, which are crucial to many technological applications. Hard X-ray spectro-imaging can visualize electrochemically driven phase transformations but demands considerably large samples with strong absorption signal so far. Here we show a conceptually new data an...
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Redox reactions provide an opportunity to convert or store energy to power our increasingly technological society. In turn, phase transformations in solids and their reversibility are key to many functionalities. [ 1–4 ] This reversibility is typically linked to the specifi c mechanism, which, in turn, can be affected by kinetic limitations, such as those imposed by solid-state transport. An ex...
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