Anode Collection

The Grove cell, from Les Merveilles de la Science, pub. 1870
3614216 The Grove cell, from Les Merveilles de la Science, pub.1870. by French School, (19th century); (add.info.: The Grove cell, an early electric primary cell named after its inventor)

Illustration of copper electrode, as cathode electrons arrive from zinc anode via external circuit, they reduce hydrogen ions from acid, forming hydrogen gas molecules

Illustration of zinc atoms in electrode dissolving in acid, losing electrons to form cations

Illustration of copper pipe anode, showing how positive terminal on battery draws electrons from anode oxidising copper atoms to copper cations

PHYSICS: APPARATUS, 1879. A Crookes tube in which a strip of platinum (b) is made red hot by the passage of current between the bowl-shaped cathode (a) and an anode (D)

Light-emitting diode (LED), cutaway computer artwork. LEDs contain a semiconductor (red square, centre left) that emits light when a current passes through it

Electroetched Zinc Anode (SEM)
Electrochemically etched zinc anode. Scanning electron micrograph showing the erosion of a marine zinc anode. Sometimes called sacrificial anodes" these units are connected to all other metal

Coolidge X-ray tube C016 / 3688
Coolidge tube. This is a device used for creating a beam of X-rays. The glass flask contains a vacuum. A cathode (right) is heated and releases electrons

Crookes cathode ray tube, 1880s C016 / 3666
Crookes tube. A Crookes tube, used to create cathode rays, made in the 1880s. This is a tube containing a near vacuum. A high voltage is applied across the two electrodes

Electricity from rice plants. Electrodes placed in a pot of rice seedlings grown underwater. Anaerobic bacteria, such as Geobacter sp

Sodium hydroxide production. Schematic diagram of the diaphragm cell method for the chlor-alkali electrolytic process to produce sodium hydroxide

Aluminium production
Aluminium smelting process. Schematic diagram of the production of aluminium metal from aluminium ore (bauxite). The first stage (left) is the Bayer Process to produce alumina (aluminium oxide)

Anode patterns, 19th century
Anode patterns. Various designs for anodes shaped to produce patterns by electrolytic deposition of metals. These patterns are usually referred to as Nobili rings

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"The Anode: Unveiling the Marvels of Science" Step into the world of scientific wonders as we explore the fascinating concept of anode. From Les Merveilles de la Science, published in 1870, we embark on a journey through various illustrations and discoveries that shed light on this essential component. In one illustration, we witness the Grove cell in action. As electrons from the zinc anode travel through an external circuit to reach the copper electrode acting as a cathode, they engage with hydrogen ions from acid, resulting in the formation of hydrogen gas molecules. This process showcases how anodes play a crucial role in chemical reactions. Delving deeper into its significance, another illustration demonstrates how zinc atoms within an electrode dissolve when exposed to acid. By losing electrons and transforming into cations, these atoms contribute to important reactions facilitated by anodes. Moving forward in time to 1879, we encounter a Crookes tube featuring a strip of platinum serving as an intriguing example of apparatus utilizing anodes for specific purposes within physics experiments. The positive terminal drawing electrons from the copper pipe's anode oxidizes copper atoms into cations further exemplifies their transformative power. The captivating world of technology also embraces this phenomenon with inventions like light-emitting diodes (LEDs) that rely on efficient electron flow between cathodes and anodes to produce mesmerizing illumination. Electroetched Zinc Anode images captured using scanning electron microscopy (SEM) showcase intricate details highlighting its unique properties. Venturing even further back in history to Coolidge X-ray tubes and Crookes cathode ray tubes from the 1880s reveals yet another application for this remarkable component – generating X-rays and exploring mysterious rays emitted by cathodes. But it doesn't stop there. An unexpected connection arises as we learn about electricity production derived from rice plants and sodium hydroxide production processes where specialized electrodes act as critical catalysts for these groundbreaking advancements.