In physical chemistry and engineering, passivation is coating a material so that it becomes "passive", that is, less readily affected or corroded by the environment. Passivation involves creation of an outer layer of shield material that is applied as a microcoating, created by chemical reaction with the base material, or allowed to build by spontaneous oxidation in the air. As a technique, passivation is the use of a light coat of a protective material, such as metal oxide, to create a shield against corrosion. Passivation of silicon is used during fabrication of microelectronic devices. Undesired passivation of electrodes, called "fouling", increases the circuit resistance so it interferes with some electrochemical applications such as electrocoagulation for wastewater treatment, amperometric chemical sensing, and electrochemical synthesis.
A "photoelectrochemical cell" is one of two distinct classes of device. The first produces electrical energy similarly to a dye-sensitized photovoltaic cell, which meets the standard definition of a photovoltaic cell. The second is a photoelectrolytic cell, that is, a device which uses light incident on a photosensitizer, semiconductor, or aqueous metal immersed in an electrolytic solution to directly cause a chemical reaction, for example to produce hydrogen via the electrolysis of water.
The photovoltaic effect is the generation of voltage and electric current in a material upon exposure to light. It is a physical phenomenon.
Nanoelectrochemistry is a branch of electrochemistry that investigates the electrical and electrochemical properties of materials at the nanometer size regime. Nanoelectrochemistry plays significant role in the fabrication of various sensors, and devices for detecting molecules at very low concentrations.
Harry Albert Atwater, Jr. is an American physicist and materials scientist and is the Otis Booth Leadership Chair of the division of engineering and applied science at the California Institute of Technology. Currently he is the Howard Hughes Professor of Applied Physics and Materials Science and the director for the Liquid Sunlight Alliance (LiSA), a Department of Energy Hub program for solar fuels. Atwater's scientific effort focuses on nanophotonic light-matter interactions and solar energy conversion. His current research in energy centers on high efficiency photovoltaics, carbon capture and removal, and photoelectrochemical processes for generation of solar fuels. His research has resulted in world records for solar photovoltaic conversion and photoelectrochemical water splitting. His work also spans fundamental nanophotonic phenomena, in plasmonics and 2D materials, and also applications including active metasurfaces and optical propulsion.
Heinz Gerischer was a German chemist who specialized in electrochemistry. He was the thesis advisor of future Nobel laureate Gerhard Ertl.
Allen Joseph Bard was an American chemist. He was the Hackerman-Welch Regents Chair Professor and director of the Center for Electrochemistry at the University of Texas at Austin. Bard developed innovations such as the scanning electrochemical microscope, his co-discovery of electrochemiluminescence, his key contributions to photoelectrochemistry of semiconductor electrodes, and co-authoring a seminal textbook.
Photoelectrochemistry is a subfield of study within physical chemistry concerned with the interaction of light with electrochemical systems. It is an active domain of investigation. One of the pioneers of this field of electrochemistry was the German electrochemist Heinz Gerischer. The interest in this domain is high in the context of development of renewable energy conversion and storage technology.
Water oxidation is one of the half reactions of water splitting:
Bipolar electrochemistry is a phenomenon in electrochemistry based on the polarization of conducting objects in electric fields. Indeed, this polarization generates a potential difference between the two extremities of the substrate that is equal to the electric field value multiplied by the size of the object. If this potential difference is important enough, then redox reactions can be generated at the extremities of the object, oxidations will occur at one extremity coupled simultaneously to reductions at the other extremity. In a simple experimental setup consisting of a platinum wire in a weighing boat containing a pH indicator solution, a 30 V voltage across two electrodes will cause water reduction at one end of the wire and a pH increase and water oxidation at the anodic end and a pH decrease. The poles of the bipolar electrode also align themselves with the applied electric field.
Sir Peter George Bruce, is a British chemist, and Wolfson Professor of Materials in the Department of Materials at the University of Oxford. Between 2018 and 2023, he served as Physical Secretary and Vice President of the Royal Society. Bruce is a founder and Chief Scientist of the Faraday Institution.
Quantum photoelectrochemistry is the investigation of the quantum mechanical nature of photoelectrochemistry, the subfield of study within physical chemistry concerned with the interaction of light with electrochemical systems, typically through the application of quantum chemical calculations. Quantum photoelectrochemistry provides an expansion of quantum electrochemistry to processes involving also the interaction with light (photons). It therefore also includes essential elements of photochemistry. Key aspects of quantum photoelectrochemistry are calculations of optical excitations, photoinduced electron and energy transfer processes, excited state evolution, as well as interfacial charge separation and charge transport in nanoscale energy conversion systems.
Doron Aurbach is an Israeli electrochemist, materials and surface scientist.
David S. Ginger is an American physical chemist. He is the B. Seymour Rabinovitch Endowed Professor of Chemistry at the University of Washington. He is also a Washington Research Foundation distinguished scholar, and chief scientist of the University of Washington Clean Energy Institute. In 2018, he was elected to the Washington State Academy of Sciences for his work on the microscopic investigation of materials for thin-film semiconductors. He was elected a member of the American Association for the Advancement of Science in 2012, and was a 2016 National Finalist of the Blavatnik Awards for Young Scientists.
Yayuan Liu is a Chinese-American materials scientist at the Massachusetts Institute of Technology. Her research considers electrochemistry, nanomaterials, and materials characterisation for the development of next-generation batteries. She was selected as one of the 2019 American Chemical Society Young Investigators and included in the 2021 Forbes 30 Under 30 list of top scientists.
Jingdong Zhang was a Chinese–Danish chemist and Professor of Chemistry at the Technical University of Denmark. Her research considered nanochemistry and the novel materials for catalysis, as well as the development of advanced characterisation techniques such as scanning tunnelling microscopy and atomic force microscopy. She was elected to the Akademiet for de Tekniske Videnskaber in 2017.
The tribovoltaic effect is a type of triboelectric current where a direct-current (DC) current is generated by sliding a P-type semiconductor on top of a N-type semiconductor or a metal surface without the illumination of photons, which was firstly proposed by Wang et al. in 2019 and later observed experimentally in 2020. When a P-type semiconductor slides over a N-type semiconductor, electron-hole pairs can be produced at the interface, which separate in the built-in electric field at the semiconductor interface, generating a DC current. Research has shown that the tribovoltaic effect can occur at various interfaces, such as metal-semiconductor interface, P-N semiconductors interface, metal-insulator-semiconductor interface, metal-insulator-metal interface, and liquid-semiconductor interface. The tribovoltaic effect may find applications in the fields of energy harvesting and smart sensing.
Song Lin is a Chinese-American organic electrochemist who is an associate professor at Cornell University. His research involves the development of new synthetic organic methodologies that utilize electrochemistry to forge new chemical bonds. He is an Associate Editor of the journal Organic Letters, and serves on the Early Career Advisory Board of Chemistry - A European Journal. He was named by Chemical & Engineering News as one of their Trailblazers of 2022, a feature highlighting LGBTQ+ chemists in academia.
Emily Warren is an American chemical engineer who is a staff scientist at the National Renewable Energy Laboratory. Her research considers high efficiency crystalline photovoltaics.
Krishnan Rajeshwar is a chemist, researcher and academic. He is a Distinguished University Professor and Founding Director of the Center for Renewable Energy Science & Technology at The University of Texas at Arlington.
