Fast charge transfer between iodide ions and a delocalized electron system on the graphite surface for boosting hydrogen production

Abstract

Developing new catalysts to reduce the energy barrier for hydrogen production from water splitting has been an important research topic. It is well-known that the water-splitting voltage is limited by...

Electrocatalysts for value-added electrolysis coupled with hydrogen evolution

“…3f and g). 54 As shown in Fig. 3h, the polarization curves of the IOR, UOR, and OER, which have the potential to drive a current density of 20 mA cm −2 , are 1.30, 1.33, and 1.54 V RHE , respectively.…”

“…After extensive research, our group discovered that electrocatalysts could be easily synthesized from metal oxides, single atoms, and metal-free carbon materials, such as ruthenium-tin surface alloy oxide (RuSn SAO), 13 self-supporting RuTiO oxide alloy, 52 defective carbon-supported single-atom Mo-N 4 /d-C electrocatalyst, 53 and graphite-based carbon fiber paper (CFP). 54 These electrocatalysts have abundant active sites and a delocalized electron system which play an important role in the adsorption, activation, and desorption of iodide ions at the catalytic sites, which are favorable for the production of valuable iodine and green hydrogen energy at a lower operating voltage. Especially another major advancement in this field of research has been reported – a systematic approach to developing a RuTiO oxide alloy on 3D web-like titania via a hydrothermal route followed by a calcination process (Fig.…”

“…Peng et al adopted non-metallic carbon fiber paper with graphite structure has multiple adsorption modes to turn three iodide ions (3I − ) into one triiodide ion and investigates the oxidation mechanism on the exposed surface of CFP graphite electrocatalyst. 54 The charge analysis was introduced to describe the interaction between graphite and 3I − in detail, as shown in Fig. 10c and d.…”

“…The most common separation strategies to separate the compounds of value-added products are liquid–liquid extraction 163 and precipitation. 54 Especially, the organic solvent extraction technique is based on the higher affinity of some compounds towards some solvents (depending on the polarity of the fraction and acid–base separation), which results in a phase transfer that allows the selective separation of value-added products. Most importantly, the cascade splitter is activated to use the products from the cathode as organic and inorganic raw materials for the anode.…”