Article
Electrochemistry
Nicholas Schwartz, Jason Harrington, Kirk Ziegler, Philip Cox
Summary: In this study, the direct electrochemically driven separation of CO2 was achieved using an asymmetric membrane electrode assembly (MEA). The MEA was fabricated with specific electrocatalyst materials and electrode structure. Through physical and chemical characterizations, as well as electrochemical testing, the catalytic activity and reaction kinetics were evaluated, providing baseline data for CO2 separation.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
D. Reinisch, T. Reichbauer, K. M. Vetter, N. Martic, G. Schmid, K. J. J. Mayrhofer
Summary: This paper presents a novel cell design and operation mode based on a catalyst coated cation exchange membrane for aqueous CO2 electrolysis. The results show that the proposed design allows for stable, efficient, and scalable operation, and successfully converts CO2 into feedstock for the chemical industry.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
J. Knossalla, J. Mielby, D. Goehl, F. R. Wang, D. Jalalpoor, A. Hoepf, K. J. J. Mayrhofer, M. Ledendecker, F. Schueth
Summary: Utilizing chemical vapor deposition (CVD) of ferrocene to synthesize hollow graphitic spheres (HGS(cvd)) presents a simple and scalable method for controlling graphitization and textural properties, showing that platinum loaded on HGS(cvd) is more stable during electrochemical degradation than catalysts based on commercial high surface area carbons. This established CVD process overcomes obstacles for broader applications of highly defined HGS.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Peng-Cheng Chen, Chubai Chen, Yao Yang, Arifin Luthfi Maulana, Jianbo Jin, Julian Feijoo, Peidong Yang
Summary: Silver-copper (AgCu) bimetallic catalysts exhibit high mobility of Cu in CO2RR conditions, leading to leaching, detachment, and agglomeration as new particles. The phase separation of Ag and Cu into Cu-rich and Ag-rich grains occurs during the reaction, approaching thermodynamic values. The role of AgCu phase boundaries is highlighted, and the metallic state of Cu in AgCu is confirmed as the catalytically active sites during CO2RR. This work provides a comprehensive understanding of the chemical and structural evolution behavior of AgCu catalysts in CO2RR.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Environmental Sciences
Yuanxu Dong, Mingxi Yang, Dorothee C. E. Bakker, Vassilis Kitidis, Thomas G. Bell
Summary: This paper evaluates the uncertainties in eddy covariance (EC) CO2 flux measurements from four cruises and finds that random errors are relatively large over short timescales. The uncertainty in hourly averaged EC air-sea CO2 fluxes ranges from 1.4 to 3.2 mmolm(-2) d(-1), with a relative uncertainty of around 20% during Arctic cruises and around 50% during Atlantic cruises with small CO2 flux magnitudes. Auto-covariance analysis suggests that the optimal timescale for averaging EC CO2 flux measurements ranges from 1 to 3 hours, leading to a higher mean signal-to-noise ratio for the four cruises.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Artem P. Tarutin, Nikolai A. Danilov, Andrey A. Kalinin, Anna A. Murashkina, Dmitry A. Medvedev
Summary: The thermomechanical and chemical properties of Pr2NiO4+a-based electrode materials were optimized via Ba-doping, reducing their chemical interaction with Ba(Ce,Zr)O3-based electrolytes.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Multidisciplinary Sciences
Liang Huang, Ge Gao, Chaobo Yang, Xiao-Yan Li, Rui Kai Miao, Yanrong Xue, Ke Xie, Pengfei Ou, Cafer T. T. Yavuz, Yu Han, Gaetano Magnotti, David Sinton, Edward H. H. Sargent, Xu Lu
Summary: Electrochemical CO2 reduction (CO2R) is a method to close the carbon cycle for chemical synthesis. The research has mainly focused on ambient pressure CO2, but industrial CO2 is usually pressurized and in dissolved form. By studying the effects of pressure on CO2R, the researchers found that higher pressure leads to increased formate selectivity. They further enhanced this pressure-mediated effect by functionalizing the surface of a Cu cathode with a proton-resistant layer. This work highlights the potential of using industrial CO2 as a feedstock for sustainable chemical synthesis.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Muhammad Ali Ehsan, Abuzar Khan, Muhammad Nadeem Zafar, Usman Ali Akber, Abbas Saeed Hakeem, Muhammad Faizan Nazar
Summary: In recent years, nickel sulfide impregnated electrocatalysts with auxiliary structural features have been developed as effective alternatives for oxygen evolution reaction (OER) in alkaline medium. Nickel sulfide (NiS) nanowire electrodes grown directly on nickel foam (NF) demonstrated excellent OER activity in 1.0 M KOH solution, with low Tafel value and good stability. The surface of the NiS catalyst was partially modified into nickel oxide after electrolysis, leading to enhanced water oxidation performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Hao Gong, Xingyu Yu, Yunyun Xu, Bin Gao, Hairong Xue, Xiaoli Fan, Hu Guo, Tao Wang, Jianping He
Summary: This study demonstrates the use of PdCu/N-CNF as a stable and efficient cathode for high-performance Li-CO2 batteries. The PdCu/N-CNF cathode delivers a large discharge capacity and cycles for a long duration, while effectively suppressing the oxidation of copper.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Thermodynamics
Nasreldin M. Mahmoud, Wenjun Zhong, Tasneem Abdalla, Qian Wang, Elbager M. A. Edreis
Summary: This study numerically investigated the effects of adding water (H2O) and carbon dioxide (CO2), main components of exhaust gas, on soot formation in ethanol diffusion flames. The results showed that the thermal effect of H2O and CO2 reduced the peak flame temperature, while their chemical effect suppressed the formation of polycyclic aromatic hydrocarbons (PAHs), which are precursors of soot, through reduced PAH precursor species and a slower PAH growth process.
COMBUSTION SCIENCE AND TECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Ekaterina Pomerantseva
Summary: The use of electrical plants and grids for power generation and transmission requires an effective mechanism for energy storage. This can be achieved through the use of electrical energy storage devices such as batteries and supercapacitors. Rational design of new materials on an atomic level, including chemical composition, structure, morphology, and heterointerfaces, is crucial for developing batteries with improved performance for specific applications. A synthesis strategy called the chemical preintercalation synthesis approach is introduced in this Account, which allows for the preparation of new intercalation host oxides, hybrid materials, and compounds with oxide/carbon heterointerfaces as electrodes in intercalation batteries. The approach allows for the control of material properties at the atomic level and opens pathways for the preparation of materials with advanced functionalities.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Chemistry, Physical
Elizabeth. Ashton, William. C. Oakley, Paul Brack, Sandra E. Dann
Summary: The controlled vapor hydrolysis of LiAlH4 has been studied for hydrogen generation in mobile fuel cell applications. The results show that under certain relative humidity, the hydrolysis products are hydrated layered double hydroxides instead of simple salts. The high hydration level and contamination with CO2 during the hydrogen production process may reduce the feasibility of the reaction.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Geosciences, Multidisciplinary
Chongya Jiang, Kaiyu Guan, Genghong Wu, Bin Peng, Sheng Wang
Summary: Gross primary productivity (GPP) quantifies the amount of carbon dioxide fixed by plants through photosynthesis, and the proposed SatelLite Only Photosynthesis Estimation (SLOPE) GPP product leverages state-of-the-art techniques to improve spatial and temporal resolution, instantaneity, and uncertainty information. Through machine learning models, efficient algorithms, and innovative approaches, the SLOPE product shows promising performance in explaining spatial and temporal variations in GPP and has great potential for monitoring crops at the field level.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Chemistry, Multidisciplinary
Chengying Guo, Wei Zhou, Xianen Lan, Yuting Wang, Tieliang Li, Shuhe Han, Yifu Yu, Bin Zhang
Summary: This study reports an electrochemical process for converting formic acid and nitrite into formamide with high selectivity under ambient conditions. Isotope-labeled experiments reveal the key bond formation process. This work is significant for upgrading CO2-derived formic acid into high-value compounds.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Mohd Monis Ayyub, C. N. R. Rao
Summary: Electrochemical reduction of CO2 to produce value-added fuels is an effective strategy. The study focuses on metal-free catalysts BxCyNz and finds that BC1.2N0.8 catalyst exhibits high CO selectivity with a high faradaic efficiency.
CHEMISTRY OF MATERIALS
(2022)
