Abstract: In an aspect, a rechargeable battery cell, comprises an anode, a cathode, a separator layer electrically separating the anode and the cathode, and an electrolyte ionically coupling the anode and the cathode. In a further aspect, the anode comprises aluminum (Al) metal or an Al alloy, the cathode comprises a compound comprising an alkali metal, the electrolyte comprises Al and ions of the alkali metal, the Al in the electrolyte alloys with or plates on the anode and the ions of the alkali metal de-insert from the cathode into the electrolyte during charging of the rechargeable battery cell, and the Al de-alloy or de-plate from the anode into the electrolyte and the ions of the alkali metal in the electrolyte insert into the cathode during discharging of the rechargeable battery cell.

Abstract: Electrodes for catalyzing electrochemical reactions (e.g., the hydrogen evolution reaction) are provided. The electrode may comprise a ternary pyrite-phase transition metal phosphochalcogenide (e.g., CoPS) disposed on a substrate, wherein the ternary pyrite-phase transition metal phosphochalcogenide is a solid material of a ternary compound of a transition metal, phosphorous (P), and a chalcogen, the solid material characterized by a substantially single, ternary alloy phase having a pyrite crystal structure. Methods of using and making the electrodes are also provided.

Abstract: Electrodes for catalyzing electrochemical reactions (e.g., the hydrogen evolution reaction) are provided. The electrode may comprise a ternary pyrite-phase transition metal phosphochalcogenide (e.g., CoPS) disposed on a substrate, wherein the ternary pyrite-phase transition metal phosphochalcogenide is a solid material of a ternary compound of a transition metal, phosphorous (P), and a chalcogen, the solid material characterized by a substantially single, ternary alloy phase having a pyrite crystal structure. Methods of using and making the electrodes are also provided.

Abstract: Electrodes for catalyzing electrochemical reactions (e.g., the hydrogen evolution reaction) are provided. The electrode may comprise a ternary pyrite-phase transition metal phosphochalcogenide (e.g., CoPS) disposed on a substrate, wherein the ternary pyrite-phase transition metal phosphochalcogenide is a solid material of a ternary compound of a transition metal, phosphorous (P), and a chalcogen, the solid material characterized by a substantially single, ternary alloy phase having a pyrite crystal structure. Methods of using and making the electrodes are also provided.