Article
Chemistry, Physical
Lei Wang, Lexane Deligniere, Samantha Husmann, Regina Leiner, Carsten Bahr, Shengjie Zhang, Chaochao Dun, Matthew M. Montemore, Markus Gallei, Jeffrey J. Urban, Choonsoo Kim, Volker Presser
Summary: Heavy metal pollution is a major environmental issue. This study focuses on the FeOOH sorbent for selectively extracting Pb2+ from a mixed solution of Co2+, Ni2+, and Pb2+. By applying a voltage, the uptake capacity of FeOOH for Pb2+ can be enhanced, and the sorbent can be effectively regenerated. The FeOOH electrode shows high selectivity towards Pb2+, with a purity of 97%+/-3% in the extracts, and the capacity retention after multiple cycles is comparable to chemical regeneration.
Article
Chemistry, Multidisciplinary
D. Thatikayala, M. T. Noori, B. Min
Summary: This paper reviews the recent progress in customizing zeolite modified electrodes (ZMEs) to develop efficient and low-cost electrodes for sensing heavy metal ions in environmental samples. The physical and chemical properties of zeolite promote favorable size and structural features for electrochemical analysis of heavy metal ions. The pore size and shape of zeolite can be customized via advanced synthesis process to achieve highly selective sensing. The present review guides researchers to develop robust sensing elements with high sensitivity and selectivity for environmental applications.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
A. Shanmugavani, Ai -Dong Li, R. Kalai Selvan
Summary: This study explored the capacitive performance of spherical Co2Fe(CN)(6) nanoparticles synthesized using open framework materials. The material exhibited high specific capacitance and cycling stability in electrolytes, indicating its potential for supercapacitor applications.
Article
Chemistry, Multidisciplinary
Eduardo Gonzalez-Martinez, Sokunthearath (Kevin) Saem, Nadine E. Beganovic, Jose M. Moran-Mirabal
Summary: A key challenge in sensor miniaturization is to create smaller electrodes without sacrificing sensitivity. In this study, gold electrodes were enhanced 30-fold by wrinkling and chronoamperometric pulsing, resulting in increased surface roughness. The nanoroughened electrodes were resistant to fouling and showed excellent performance in detecting Cu2+ and glucose. The authors anticipate that this methodology can accelerate the development of simple, cost-effective, and highly sensitive electrochemical platforms.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Sang-Mun Jung, Jinhyeon Lee, Jaesub Kwon, Byung-Jo Lee, Seung-Yeon Kang, Kyu-Su Kim, Sang-Hoon You, Young Jin Lim, Sung Gu Kang, Yong-Tae Kim
Summary: Thermo-electrochemical cells (TECs) are being studied as a viable option to harvest waste heat energy. In this study, a tungsten carbide (WCx) electrode was used as a substitute for expensive materials like Pt and nanostructured carbon. This non-noble-metal electrode significantly reduced the cost of the TEC system and delivered an impressive power output. The study demonstrates the potential of WCx as an economical and stable electrode material for waste heat energy harvesting.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Analytical
Nan Wang, Shangming Huang, Hanwei Cai, Xidong Lin, Riguo Mei, Ning Wang
Summary: This study established an electrochemical sensor based on CoCu-MOF/PANI that can simultaneously detect Pb2+ and Cd2+ in water samples. The sensor demonstrated good detection limits, as well as anti-interference and reproducibility. The results provide an effective method for heavy metal ion detection.
MICROCHEMICAL JOURNAL
(2023)
Article
Engineering, Environmental
R. Choumane, S. Peulon
Summary: The electrochemical process efficiently removes Pb(II) from wastewater by forming adherent thin films of oxides under specific potential and pH conditions, reaching acceptable concentrations for environmental and drinking water standards with low energy input. The process was successfully applied to wastewater from a treatment plant, demonstrating its effectiveness in separating and purifying lead-containing wastewater.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Qifeng Wang, Qinghao Wu, Shujuan Meng, Hongju Liu, Dawei Liang
Summary: This study investigated the use of transition metal hexacyanoferrates (MHCF) as selective electrodes for capturing NH4+ in brine for nutrient recovery from wastewater. The electrochemical characteristics of five different MHCF electrodes were studied, and their desalting capacity, stability, and energy consumption were evaluated. Results showed that the NiHCF electrode exhibited the best performance in terms of specific desalination capacity, charge efficiency, and stability. This study demonstrates the promising potential of MHCF as selective electrodes for nutrient removal and recovery in wastewater.
Article
Chemistry, Inorganic & Nuclear
Rui Zhong, Liping Cui, Kai Yu, Jinghua Lv, Yuhang Guo, Enmin Zhang, Baibin Zhou
Summary: Two Wells-Dawson arsenotungstate coordination polymers were assembled via a hydrothermal method, showing unique structures and excellent electrochemical performance, including high specific capacitance, good cycling stability, and superior electrical conductivity.
INORGANIC CHEMISTRY
(2021)
Article
Environmental Sciences
Yu Yu, Yiwei Zhong, Wanli Sun, Jiajun Xie, Mingyong Wang, Zhancheng Guo
Summary: A centrifugal electrode reactor was designed and applied in the treatment of heavy metal wastewater, which significantly improved the removal efficiency of heavy metals. The analysis showed that the improved performance was due to the dissolution characteristic of centrifugal electrodes and the enhanced diffusion of chloride ions.
Article
Energy & Fuels
Sang-Mun Jung, Jaesub Kwon, Jinhyeon Lee, Byung-Jo Lee, Kyu-Su Kim, Dong-Seok Yu, Yong-Tae Kim
Summary: Hybrid thermo-electrochemical cells utilizing tungsten electrodes show enhanced power generation compared to traditional systems, thanks to the combination of redox reactions of hexacyanoferrate electrolytes and oxidation of tungsten electrodes. The economic feasibility of using tungsten as an electrode material makes this system a potential candidate for commercial thermoelectrochemical cells.
Article
Electrochemistry
Min Li, Angelo Mullaliu, Stefano Passerini, Marco Giorgetti
Summary: In this study, sodium titanium hexacyanoferrate (TiHCF) was successfully synthesized and its potential as a positive electrode material for both Li-ion and Na-ion batteries was demonstrated. Interestingly, TiHCF showed better electrochemical performance as a Na-ion host, making it a promising candidate electrode material for Na-ion batteries due to the activation of Ti towards the redox reaction.
Article
Chemistry, Analytical
Guoli Xu, Danqun Huo, Jingzhou Hou, Chao Zhang, Yanan Zhao, Changjun Hou, Jing Bao, Xin Yao, Mei Yang
Summary: A novel electrochemical aptamer sensor platform for malathion detection was successfully constructed based on nanocomposite probe, showing excellent ability of signal amplification and strong selectivity.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Jongmin Lee, Soosung Kim, Heungjoo Shin
Summary: This study develops a highly sensitive electrochemical heavy metal sensor based on hierarchical porous carbon electrodes, which can detect Cd(II) and Pb(II) at low concentrations. The hierarchical porous structure and sub-micrometer edges of the nanoporous carbon electrodes contribute to the enhanced performance of the sensor.
Article
Engineering, Environmental
Chen Peng, Zhang Xinwan, Meng Guangyuan, Fu Tao, Xue Yuanyuan, Wang Zhiwei, Song Pengfei, Zhang Lehua, Liu Haifeng
Summary: Graphite felt cathode based flow-through electrochemical system showed high electroreduction efficiency for aqueous Cr(VI) due to forced convection and enhanced mass transfer. However, gas accumulation and unstable operation caused by bubbles generated by water electrolysis were issues. In this study, a graphite felt flow-through cathode designed with hydrophobic PTFE as bubbles enrichment sites and gas-diffusion-microchannel was demonstrated to assist in Cr(VI) electrochemical reduction. The addition of PTFE increased the Cr(VI) reduction kinetics constant by 4.6 times and was 2.6-5.7 times higher than parallel-plate electrodes system. Batch experiments achieved -99.9% Cr(VI) reduction efficiency under specific conditions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Nayeong Kim, Jiho Lee, Xiao Su
Summary: This study demonstrates a polyelectrolyte functionalization approach to achieve multicomponent separation of organic acids in a redox-flow electrodialysis platform. The selectivity of organic acids can be precisely tuned through the control of membrane properties. This method allows for selective recovery of succinic acid with high purity, energy efficiency, and membrane stability.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Hyowon Seo, T. Alan Hatton
Summary: This study presents an electrochemical direct air capture (DAC) method using air-stable redox couple of neutral red, which requires a minimum energy requirement of 65 kJ(e)/mol(CO2). Direct air capture of carbon dioxide is a viable option for mitigating CO2 emissions and their impact on global climate change.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Paola Baldaguez Medina, Valentina Ardila Contreras, Frank Hartmann, Deborah Schmitt, Angelique Klimek, Johannes Elbert, Markus Gallei, Xiao Su
Summary: The remediation of perfluoroalkyl substances (PFAS) is an urgent challenge, and the use of redox polymers in electrosorption is a promising approach. Metallopolymers with different redox potentials were synthesized, and their performance for PFAS removal was evaluated. The results showed that the more negative the formal potential of the redox polymers, the higher the PFOA uptake and regeneration efficiency. Poly(2-(methacryloyloxy)ethyl cobaltoceniumcarboxylate hexafluorophosphate) (PMAECoPF6) showed the highest affinity towards PFOA, with a high uptake capacity and regeneration efficiency. The study also demonstrated the capability of PFAS remediation in complex water sources, even at ppb levels of contaminants.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Jemin Jeon, Johannes Elbert, Ching-Hsiu Chung, Junice Chae, Xiao Su
Summary: Synthetic chiral platforms coupled with redox-mediated electrochemical processes can exhibit powerful enantioselective interactions. Chiral redox-metallopolymers, designed based on Ugi's amine-inspired chiral monomers, demonstrate enantioselective recognition of ionic enantiomers using electrochemical control. The supramolecular chirality resulting from intramolecular interactions enhances the recognition towards target enantiomers. The study highlights the potential of chiral redox-metallopolymers as platforms for electrochemically-modulated enantioselective interactions towards amino acids and pharmaceutical carboxylates.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Environmental
Wei Shi, Jinxing Ma, Fei Gao, Ruobin Dai, Xiao Su, Zhiwei Wang
Summary: We developed an Fe-based metal-organic framework (MOF) for the highly selective removal of trace, highly toxic arsenic from water, which is vital for the adequate and safe drinking water supply for over 230 million people affected by arsenic contamination around the globe.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Anaira Roman Santiago, Song Yin, Johannes Elbert, Jiho Lee, Diwakar Shukla, Xiao Su
Summary: With increasing regulations on PFAS, it is crucial to understand the molecular interactions that drive their binding by functional adsorbent materials for effective removal from water streams. Short-chain PFAS pose a challenge for material design, but this study demonstrates how tailored structural units and electrochemical control can enhance affinity and capture of these contaminants. The new class of fluorinated redox-active amine-functionalized copolymers showed promising results in binding short-chain PFAS, and the addition of an induced electric field improved the reversibility of release.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Kai-Jher Tan, Satoshi Morikawa, Nil Ozbek, Magdalena Lenz, Carsten-Rene Arlt, Andre Tschoepe, Matthias Franzreb, T. Alan Hatton
Summary: A framework of ferrocene-containing polymers with adjustable pH and redox properties was developed. The electroactive metallopolymers had enhanced hydrophilicity and could be prepared as conductive nanoporous carbon nanotube composites. The presence of charged non-redox-active moieties in the polymeric structure endowed it with pH-dependent electrochemical behavior and was used for the enhanced electrochemical separation of transition metal oxyanions.
Article
Multidisciplinary Sciences
Kwiyong Kim, Alexandra Zagalskaya, Jing Lian Ng, Jaeyoung Hong, Vitaly Alexandrov, Tuan Anh Pham, Xiao Su
Summary: In this study, a bifunctional redox-electrode was designed to achieve the reactive separation of nitrate to ammonium in a single electrochemical cell, providing an attractive solution for pollutant remediation and ammonia production. The results show that electrochemical control can achieve reversible nitrate uptake greater than 70 mg/g and greatly enhance energy efficiency. This study provides a generalized strategy for a fully electrified reaction-separation pathway for modular nitrate remediation and ammonia production.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Stephen R. Cotty, Nayeong Kim, Xiao Su
Summary: The rapid growth of the industrial and electronics sectors has caused a higher demand for gold. Efficient gold separation technologies are crucial to maintain gold purity in mined ores and meet the need for electronic waste recycling. A modular electrochemical separation platform using metallopolymer-functionalized electrodes was proposed to selectively recover and concentrate gold from electronic waste and simulated mining streams. The platform demonstrated high uptake of cyano-gold and exceptional separation factor for gold vs other metals, rapid gold uptake, and electrochemically mediated release and concentration.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Nayeong Kim, Johannes Elbert, Choonsoo Kim, Xiao Su
Summary: We propose a strategy for advancing electrodialysis technologies by implementing a water-soluble redox-copolymer to eliminate the need for anion-exchange membranes and deploy cheaper and more robust nanofiltration membranes. This strategy enables continuous desalination of various source waters and removal of organic contaminants without fouling or polymer crossover, significantly reducing energy consumption and achieving economic feasibility.
ACS ENERGY LETTERS
(2023)
Article
Engineering, Environmental
Kyle M. Diederichsen, Stephen J. A. DeWitt, T. Alan Hatton
Summary: Electrochemically mediated CO2 separations have gained attention as a potential low-cost and low-energy carbon capture technology. A multitubular electrochemical separation cell, utilizing porous, tubular electrodes, has been developed to enhance performance and provide a vast design space. The continuous separation of CO2 from a gas mixture and its release in pure form has been demonstrated, highlighting the potential of this electrochemical approach.
ACS ES&T ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Youhong Guo, Vittoria Bolongaro, T. Alan Hatton
Summary: Carbon capture and sequestration technologies are crucial for mitigating climate change, and solid sorbent-based systems show promise as an alternative to aqueous amine scrubbing. However, their practical implementation faces difficulties in CO2 uptake at low concentrations and regeneration. In this study, sustainable carbon-capture hydrogels (SCCH) were developed with a high CO2 uptake and the ability for solar-powered regeneration, using a biomass gel network and pre-captured moisture to enhance CO2 binding efficiency. The findings highlight the potential of SCCH for sustainable carbon capture to meet global decarbonization targets.
Article
Chemistry, Multidisciplinary
Ki-Hyun Cho, Raylin Chen, Johannes Elbert, Xiao Su
Summary: Redox-mediated photoelectrochemical separation process utilizes solar energy as a driver for selective electrosorption, achieving efficient separation of heavy metal oxyanions.
Article
Chemistry, Multidisciplinary
Seoni Kim, Michael P. Nitzsche, Simon B. Rufer, Jack R. Lake, Kripa K. Varanasi, T. Alan Hatton
Summary: In recent years, the ocean has been recognized as a global reservoir for CO2. An asymmetric electrochemical system utilizing bismuth and silver electrodes is reported as an effective means of capturing and removing CO2 from ocean water. With two silver-bismuth systems operating in a cyclic process, CO2 can be continuously removed from simulated ocean water with low energy consumption and high electron efficiency.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Review
Chemistry, Physical
Emmanuel Mousset, Melanie Fournier, Xiao Su
Summary: Electroseparations have gained interest in selective recovery of value-added compounds from wastewater. Coupling electroseparations with electroconversion has led to new materials and systems with enhanced reactivity and selectivity. Evaluating the efficiency and scalability of these electrochemical systems in real effluent contexts remains a challenge.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)