Nomnotho Jiyane, Carla Santana Santos, Igor Echevarria Poza, Mario Palacios Corella, Muhammad Adib Abdillah Mahbub, Gimena Marin-Tajadura, Thomas Quast, Maria Ibáñez, Edgar Ventosa,Wolfgang Schuhmann
The determination of the intrinsic properties of solid active material candidates is essential for their performance optimization. However, macroscopic electrodes and related analytical techniques show challenges concerning the number of additionally influencing parameters. We explore recessed microelectrodes (rME) as a platform that allows for a binder-free investigation of Prussian Blue analogues (PBA), a family of promising battery materials.
Rajini P. Antony, Lejing Li, Carla Santana Santos, Ndrina Limani, Stefan Dieckhöfer, Thomas Quast, Jonas Weidner, Wolfgang Schuhmann
The authors present a novel scanning electrochemical microscopy approach to measure local pH near a working MEA in zero-gap electrolyzers, offering insights into proton transport efficiency, the effects of activation, electrolyte buffering, and poisoning, all crucial for optimising sustainable fuel production.
Geovane Arruda de Oliveira, Moonjoo Kim, Carla Santana Santos, Ndrina Limani, Taek Dong Chung, Emmanuel Batsa Tetteh, Wolfgang Schuhmann
Scanning electrochemical cell microscopy (SECCM) has been used to explore structure-electrocatalytic activity relationships through high-resolution mapping of local activities of electrocatalysts. However, utilizing SECCM in strongly alkaline conditions presents a significant challenge due to the high wettability of the alkaline electrolyte leading to a substantial instability of the droplet in contact with the sample surface, and hence to unpredictable wetting and spreading of the electrolyte.
Dr. Carla Santana Santos, Dr. Thomas Quast, Prof. Edgar Ventosa, Prof. Wolfgang Schuhmann
We demonstrate a nanoelectrochemical methodology to monitor the reaction between the dissolved species in solution and the solid active material electrodeposited in recessed carbon nanoelectrodes. Our strategy overcomes issues inherent to standard methodologies, such as mass transport limitation, and evaluation of the intrinsic reactivity of the solid material.
Sirugaloor Thangavel Senthilkumar, Santiago E. Ibañez, Paula Navalpotro, Eduardo Pedraza, Nagaraj Patil, Jesus Palma, Rebeca Marcilla
In this study, we develop a membrane-free Zn hybrid redox flow battery (RFB) using an unconventional water-in-salt aqueous biphasic system (WIS-ABS). This membrane-free Zn hybrid battery employs soluble ferrocene (Fc) derivative and Zn salt as the active species in the immiscible catholyte and anolyte, respectively.
Dr. Lejing Li, Dr. Rajini P. Antony, Dr. Carla Santana Santos, Dr. Ndrina Limani, Dr. Stefan Dieckhöfer, Prof. Dr. Wolfgang Schuhmann
For the anodic H2O2 generation, it has been shown that the electrolyte composition can steer the reaction pathway toward increased H2O2 generation. For this study, local pH measurements were performed using a Au nanoelectrode positioned in close proximity to an operating anode by shear-force scanning electrochemical microscopy (SECM).
Walner Costa Silva, Moonjoo Kim, Geovane Arruda de Oliveira, Leandro Vitor da Silva, Emmanuel Batsa Tetteh, Cynthia Marina Rivaldo Gomez, Wellerson dos Reis Ramos, Benjamin Fragneaud, Wolfgang Schuhmann, Carla Santana Santos, Daniel Grasseschi
Finding strategies to enhance catalysts’ electrochemical activity is based on controlling the material design. Bidimensional materials (2DM) such as MoS2 are explored as catalysts for the hydrogen evolution reaction (HER). A comprehensive study of the effects of doping 2D materials with transition metals based on theoretical predictions in tandem with experimental investigation correlates the doping type to the changes in the electronic and electrochemical activity.
Miguel Cantera, Lara Lubián, Koray Cavusoglu, Rubén Rubio-Presa, Prof. Roberto Sanz, Virginia Ruiz, Prof. Jose María Cámara, Prof. Edgar Ventosa
Faradaic imbalance is one of the factors that shortens lifetime of aqueous organic redox flow batteries by reducing its capacity. This work proposes an automatized system based on a rebalancing device located in an external reactor. The system is able to recover the capacity and maintain it during 800 cycles.
Lejing Li, Ndrina Limani, Rajini P Antony, Stefan Dieckhöfer, Carla Santana Santos, Wolfgang Schuhmann
The scarcity of state-of-the-art oxygen evolution reaction (OER) electrocatalysts has led to intensive research on alternative viable electrocatalytic materials. While activity and cost are the main factors to be sought after, the catalyst stability under harsh acidic conditions is equally crucial.