The use of poly-cation oxides to lower the temperature of two-step thermochemical water splitting

Abstract

We report the discovery of a new class of oxides – poly-cation oxides (PCOs) – that consist of multiple cations and can thermochemically split water in a two-step cycle to produce hydrogen (H2) and oxygen (O2).

Review of high entropy ceramics: design, synthesis, structure and properties

“…The novelty of HECs means that there are considerable opportunities to identify other interesting effects on other properties. Some interesting recent work has been reported on multi-element oxides that show promising properties as enhanced thermochemical water splitting catalysts 74 and CO oxidation catalysts. 47 There have also been a few reports of interesting magnetic effects in (Mg,Ni,Co,Zn,Cu)O based rock salt structured oxides 67,75 and perovskite structured oxides; 76 including a compressive Jahn-Teller distortion and long range magnetic order despite substantial chemical and structural disorder on the metal sublattice.…”

Charge‐Induced Disorder Controls the Thermal Conductivity of Entropy‐Stabilized Oxides

“…However, only recently was the concept of entropy stabilization realized in ceramics, allowing for an ideal platform to study the role of mass and interatomic force disorder beyond what has been previously accessible. Since the conception of these ceramics, high‐entropy oxides have demonstrated the capability for superionic mobility and thermochemical water splitting . Furthermore, high configurational entropy can be highly beneficial to the development of thermoelectric properties .…”

A new perspective on global renewable energy systems: why trade in energy carriers matters

“…9,15 Powerto-fuel technologies use electricity, generated by any available renewable power generation technology, for electrolysis of water 16 or carbon dioxide 17 with potential subsequent upgrades to methane 18 or liquid fuels. 14,19 In contrast, solar fuel technologies produce renewable hydrogen or carbon based fuels directly from solar light, water, and/or carbon dioxide using thermo-chemical [20][21][22] or photoelectro-chemical 15,23,24 processes.…”