The electrochemical synthesis of peroxodicarbonate was performed on boron‐doped DIACHEM® diamond anodes (BDD). The influence of various parameters was studied and promising conditions were determined in an undivided cell design by CONDIAS GmbH. The best performance was obtained with a temperature below room temperature (<18 °C), high current density (720 mA cm−2), high flow velocity (170 cm s−1) and starting concentration close to the maximum solubility of sodium carbonate (1.5 M Na‐carbonate). A high concentration of peroxodicarbonate of 282 mM was obtained with highest current efficiency of about 76%. Future industrial applications appear to be promising. Experiments performed to investigate the bleaching power of the peroxodicarbonate gave promising results. Additionally, a new type of DIACHEM® diamond electrode based on Molybdenum substrate was successfully tested.

Lignin, the world's largest resource of renewable aromatics, with annually roughly 50 million tons of accruing technical lignin, mainly Kraft lignin, is highly underdeveloped regarding the production of monoaromatics. We demonstrate the oxidative depolymerization of Kraft lignin at 180 °C to produce vanillin 1 in yields up to 6.2 wt % and 92 % referred to the maximum yield gained from the quantification reaction utilizing nitrobenzene. Using peroxodicarbonate (C2O62−) as “green” oxidizer for the degradation, toxic and/or harmful reagents are prevented. Also, the formed waste can serve as makeup chemical in the pulping process. Na2C2O6 is synthesized in an ex‐cell electrolysis of aqueous Na2CO3 at BDD anodes, achieving a yield of Na2C2O6 with 41 %. At least, the oxidation and degradation of Kraft lignin is analysis via UV/Vis and NMR spectroscopy.

Boron‐doped diamond (BDD) represents a powerful and innovative electrode material. In particular, in combination with fluorinated solvents such as 1,1,1,3,3,3‐hexafluoro‐2‐propanol (HFIP), the system exhibits the largest known electrochemical window of approximately 5 V in protic media. Furthermore, the anodic treatment allows the direct formation of oxyl radicals, which are known to exhibit specific reactivity. The electrochemical dehydrogenative phenol‐phenol cross‐coupling is a versatile and useful transformation to non‐symmetric biphenols. This electro‐organic conversion can be divided into two regimes: initial oxidation at the anode and the electrolyte‐controlled follow‐up reaction. This work intends to provide an answer about the influence of BDD electrodes on oxidation reactions in electrosynthesis. Depending on the electro‐organic transformation, the support material of BDD, its boron content, and its fabrication method have a significant influence on the electrosynthetic efficiency.

Electrochemical advanced oxidation processes (EAOP®) are promising technologies for the decentralized treatment of water and will be important elements in achieving a circular economy. To overcome the drawback of the high operational expenses of EAOP® systems, two novel reactors based on a next-generation boron-doped diamond (BDD) anode and a stainless steel cathode or a hydrogen-peroxide-generating gas diffusion electrode (GDE) are presented. This reactor design ensures the long-term stability of BDD anodes. The application potential of the novel reactors is evaluated with artificial wastewater containing phenol (COD of 2000 mg L−1); the reactors are compared to each other and to ozone and peroxone systems. The investigations show that the BDD anode can be optimized for a service life of up to 18 years, reducing the costs for EAOP® significantly. The process comparison shows a degradation efficiency for the BDD–GDE system of up to 135% in comparison to the BDD–stainless steel electrode combination, showing only 75%, 14%, and 8% of the energy consumption of the BDD–stainless steel, ozonation, and peroxonation systems, respectively. Treatment efficiencies of nearly 100% are achieved with both novel electrolysis reactors. Due to the current density adaptation and the GDE integration, which result in energy savings as well as the improvements that significantly extend the lifetime of the BDD electrode, less resources and raw materials are consumed for the power generation and electrode manufacturing processes.

Lignin, die weltweit größte erneuerbare Ressource für Aromaten, mit jährlich etwa 50 Mio. Tonnen anfallendem technischen Lignin, hauptsächlich Kraft-Lignin, ist bezüglich der Synthese von monoaromatischen Verbindungen deutlich unterentwickelt. Wir zeigen die oxidative Depolymerisierung von Kraft-Lignin, bei 180 °C, zur Herstellung von Vanillin 1, in Ausbeuten von bis zu 6,2 Gew% und 92 % bezogen auf die maximale Ausbeute aus der Quantifizierungsreaktion mittels Nitrobenzol. Durch die Verwendung von Peroxodicarbonat (C 2 O 6 2À ) als "grünes" Oxidationsmittel, werden für den Ligninabbau toxische und/oder schädliche Reagenzien vermieden. Außerdem dient der entstehende Abfall als Make-Up-Chemikalie für den Zellstoffprozess. Na 2 C 2 O 6 wurde in einer ex-cell-Elektrolyse von wässriger Na 2 CO 3 -Lösung an BDD-Anoden in einer Ausbeute von 41 % synthetisiert. Weiterhin wurden die Oxidation und der Abbau von Kraft-Lignin mittels UV/ Vis-und NMR-Spektroskopie analysiert.