Ana participates in the Pint of Science 2022

Ana had a fantastic time presenting her work in sustainable materials for energy at this year’s Pint of Science. The audience was able to produce energy enough to light an LED and to make candyfloss – similar to how we produce fibres in our lab! Thank you all for a great evening!

Congratulations to Ana for being awarded a Royal Society International Exchanges Grant with MIT

Ana has been awarded a Royal Society International Exchanges Grant with MIT.

This grant (March 2022 – March 2024) will start a new collaboration with Prof Brushett from MIT (Massachusetts Institute of Technology, Chemical Engineering Department) and his team. During this collaborative project Prof Brushett and several members of his team will visit our facilities and work in our labs to develop new understanding on electrode materials for redox flow batteries. Likewise, Ana Sobrido and several members of her research group will visit Brushett group’s facilities and acquire new knoweldge in stack testing and techno-economic analysis of the introduction of biomass-waste electrodes and replacement of commercial carbons.

The award will be the foundation for further collaborative research.

New publication by Gengyu!

Efficient Harvesting and Storage of Solar Energy of an All-Vanadium Solar Redox Flow Battery with a MoS2@TiO2 Photoelectrode


J. Mater. Chem. A
, 2022 DOI: 10.1039/D2TA00739H

Gengyu Tian, Rhodri Jervis, Joe Briscoe, Madga Titirici and Ana Jorge Sobrido*

Abstract

Solar redox flow batteries constitute an emerging technology that provide a smart alternative for the capture and storage of discontinuous solar energy through the photo-generation of the discharged redox species employed in traditional redox flow batteries. Here, we show that a MoS2-decorated TiO2 (MoS2@TiO2) photoelectrode can successfully harvest light to be stored in a solar redox flow battery using vanadium ions as redox active species in both catholyte and anolyte, and without the use of any bias. MoS2@TiO2 photoelectrode achieved an average photocurrent density of ~0.4 mA cm-2 versus 0.08 mA cm-2 for bare TiO2, when tested for the oxidation of V4+ to V5+, attributed to a more efficient light harvesting and charge separation for the MoS2@TiO2 relative to TiO2. The designed solar redox flow cell exhibited an optimal overall solar-to-chemical conversion efficiency of ~4.78%, which outperforms previously reported solar redox flow batteries. This work demonstrates the potential of MoS2@TiO2 photoelectrode to efficiently convert solar energy in to chemical energy in a solar redox flow battery, and it also validates the great potential of this technology to increase reliability in renewable energies.

New publication in collaboration with NPU X’ian -Surface self-reconstruction of telluride induced by in-situ cathodic electrochemical activation for enhanced water oxidation performance

Applied Catalysis B: Environmental

Volume 310, 5 August 2022, 121355

Metal tellurides attract recent attention because of their promising applications as effective catalysts for the oxygen evolution reaction (OER). However, inappropriate adsorption energy between OER intermediates and telluride leads to an unsatisfactory electrocatalytic intrinsic activity. Herein, we adopt a unique in-situ cathodic electrochemical activation process to facilitate the surface self-reconstruction to form oxygen vacancy (OV)-rich TeO2 layer onto Fe-doped NiTe (OV@Fe-NiTe). Characterizations and theoretical calculation demonstrate that the presence of the OV-rich TeO2 layer realizes the adjustment of d-band center of the active site that translates into an enhancement of the adsorption of *OOH intermediate and thus the optimization of the OER pathway. Consequently, the OV@Fe-NiTe only requires an ultralow overpotential of 245 mV to drive 100 mA cm-2 in 1 M KOH, 95 mV lower than that of Fe-NiTe, and hence becoming the best water oxidation electrocatalysts amongst recently reported telluride electrocatalysts. This study presents a unique strategy to exploit telluride-based catalysts through electrochemical surface engineering.

Qian passed her PhD viva – 25th March 2022

Congratulations to Qian Guo for passing her viva on 25th March 2022 with Prof Steve Dunn and Dr Ludmilla Steier as examiners. Well done Qian! Qian’s PhD project focused on the synthesis and study of photoelectrochemical systems based on hematite for photo-assisted water oxidation, supervised by Dr Ana Jorge Sobrido and Prof Magda Titirici (now at ICL).

Goodbye Stiven!

Stiven left QMUL and London on the 21st February 2022, back to Medellin, Colombia, to continue his studies in energy storage. Time has gone by really quick, but you managed to get lots of results (including a paper which will be soon published) and engaged with everyone. The group will miss you! Best of luck, and hope we will work again together.

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New publication – Feb 2022

Sustainable Electrodes for the Next Generation of Redox Flow Batteries, by Michael Thielke, Gengyu Tian and Ana B. Jorge Sobrido, J. Phys.: Mater. 2022

Abstract

The development of alternative energy storage technologies is key to advance renewable energy resources. Among them, redox flow batteries have been identified to be one of the most promising technologies in the field of stationary batteries. The carbon-based electrodes in these batteries are a crucial component and play an important part in achieving high efficiency and performance. A further leap into this direction is the design of fossil-free materials by incorporating sustainable alternative resources as the carbon component in the processing of the electrodes. The use of biomass as carbon precursor for electrode applications has also been a focus of research for other energy storage devices and in the case of redox flow batteries, it has become an emergent topic in recent years. This short review presents the recent advances in the design of biomass-derived carbon materials as electrodes in redox flow batteries, strategies to enhance their electrocatalytic properties, challenges, and future outlook in the design of sustainable electrode materials.