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Coupled Dynamics of Anode and Cathode in Proton-Exchange Membrane Fuel Cells

Articles from Wiley - 5 agosto, 2019 - 00:00

An external reference electrode is used to monitor the cathodic potential during the operation of a direct methanol fuel cell and a direct formic acid fuel cell under the regular and oscillatory regimes. Cathodic oscillations synchronized with the cell voltage dynamics, which had not been reported so far for fuel cells, are observed in these systems. The results can be attributed to two main coupling processes, namely, coupling through proton concentration and a global coupling stemming from the control mode (potentiostatic or galvanostatic).

[Articles]
Jéssica A. Nogueira, Prof. Dr. Katharina Krischer, Prof. Dr. Hamilton Varela
doi.org/10.1002/cphc.201900531

Experimental Investigation of the Dynamical Modes of Four Pulse-Coupled Chemical Micro-Oscillators

Articles from Wiley - 5 agosto, 2019 - 00:00

Switching between different dynamical modes in a network of four pulse-coupled chemical micro-oscillators is studied.

[Communications]
Ivan S. Proskurkin, Pavel S. Smelov, Prof. Dr. Vladimir K. Vanag
doi.org/10.1002/cphc.201900421

Structure-Tunable Copper-Indium Catalysts for Highly Selective CO<sub>2</sub> Electroreduction to CO or HCOOH

Articles from Wiley - 5 agosto, 2019 - 00:00

Get In: Bimetallic copper-indium catalysts were synthesized by using a coprecipitation method. Distinct phase evolutions and product distributions can be achieved with varying metal compositions. The Cu-In catalysts are found to be among the best reported In-based catalysts for electrochemical CO2 reduction to CO or HCOOH, with selectivity depending on structure-sensitive binding strength of key reactive intermediates.

[Communications]
Prof. Minghui Zhu, Dr. Pengfei Tian, Jiayu Li, Jiacheng Chen, Prof. Jing Xu, Prof. Yi-Fan Han
doi.org/10.1002/cssc.201901884

Bio-Inspired Synthesis of Hematite Mesocrystals by Using Xonotlite Nanowires as Growth Modifiers and Their Improved Oxygen Evolution Activity

Articles from Wiley - 5 agosto, 2019 - 00:00

A word to the wires: Hematite particles are prepared by using xonotlite nanowires (XNWs) as growth modifiers. The concentrations of XNWs and iron(III) ions can control the morphology and size of the hematite particles. The obtained particles exhibit good catalytic performance in the oxygen evolution reaction, affording a current density of 10 mA cm−2 with an overpotential of 370 mV, a small Tafel slope of 65 mV dec−1, and good stability in alkaline electrolyte.

[Communications]
Dr. Yang-Yi Liu, Fu-Jia Chang, Dr. Huai-Ling Gao, Si-Ming Chen, Prof. Dr. Min-Rui Gao, Dr. Ya-Rong Zheng, Prof. Dr. Helmut Cölfen, Dr. Chuan-Xin He, Prof. Dr. Shu-Hong Yu
doi.org/10.1002/cssc.201900861

Novel Perovskite Materials for Thermal Water Splitting at Moderate Temperature

Articles from Wiley - 5 agosto, 2019 - 00:00

Clean hydrogen can be produced through water splitting at moderate temperature (700 °C) by two-step reversible thermochemical cycles based on the perovskite oxides Sr2CoNb1−xTixO6−δ (x=1, 0.7; δ=number of oxygen vacancies). These compounds show outstanding hydrogen yield, making them potentially useful for real applications.

[Full Papers]
Prof. M. Teresa Azcondo, Dr. María Orfila, Prof. Javier Marugán, Prof. Raúl Sanz, Dr. Alvaro Muñoz-Noval, Dr. Eduardo Salas-Colera, Dr. Clemens Ritter, Prof. Flaviano García-Alvarado, Prof. Ulises Amador
doi.org/10.1002/cssc.201901484

Solvent and Counter-Ion Induced Coordination Environment Changes Towards Ag<sup>I</sup> Coordination Polymers

Articles from Wiley - 5 agosto, 2019 - 00:00

Silver coordination polymers using the multimodal and flexible 9,9′-bis(4,5-diazafluorene) ligand. Changing coordination and topology by exploiting solvent and counterion effects.

[Communications]
Arvind Kumar Gupta, Daniel Morales Salazar, Andreas Orthaber
doi.org/10.1002/ejic.201900722

Calcium Amido Complexes Coordinated by Tridentate Amidinate Ligands: Synthesis, Structures and Catalytic Activity in Olefin Hydrophosphination and Polymerization of Cyclic Esters

Articles from Wiley - 5 agosto, 2019 - 00:00

Heteroleptic calcium amidoamidinate complexes [2-(Ph2P=NPh)C6H4NC(tBu)=N(2,6-R2C6H3)]Ca[N(SiMe3)2](thf) {R = iPr (1); R = Me (2)} catalyze intermolecular hydrophosphination C=C and C≡C bonds and ROP of ε-caprolactone and rac-lactide.

[Full Papers]
Aleksei O. Tolpygin, Anton V. Cherkasov, Georgy K. Fukin, Tatyana A. Kovylina, Konstantin A. Lyssenko, Alexander A. Trifonov
doi.org/10.1002/ejic.201900610

Influence of Hetero-Biaryl Ligands on the Photo-Electrochemical Properties of [Re<sup>I</sup>NCS(N<sup>∩</sup>N)(CO)<sub>3</sub>]-Type Photosensitizers

Articles from Wiley - 5 agosto, 2019 - 00:00

A systematic variation of bi-, tri- and tetra-azo substituted diimine ligands reveals pyridazine as a promising scaffold for increased visible absorption, whilst maintaining relatively long lifetimes and quantum yields.

[Full Papers]
Mathias Mosberger, Benjamin Probst, Bernhard Spingler, Roger Alberto
doi.org/10.1002/ejic.201900652

Catalytic Assessment of Copper(I) Complexes and a Polymer Analog towards the One-Pot Synthesis of Imines and Quinoxalines

Articles from Wiley - 5 agosto, 2019 - 00:00

Copper(I) complex containing acylthiourea and its heterogeneous counterpart catalyse the synthesis of imines and quinoxalines. Heterogeneous catalyst has the advantage of reusability.

[Full Papers]
Dharmalingam Sindhuja, Punitharaj Vasanthakumar, Nattamai Bhuvanesh, Ramasamy Karvembu
doi.org/10.1002/ejic.201900555

How the periodic table changed my life

Chemical News - 4 agosto, 2019 - 23:51
YouTube chemist Sir Martyn Poliakoff and other essayists share personal stories about how the elements have shaped their worlds

Sir Martyn Poliakoff on the periodic table's ability to inspire joy

Chemical News - 4 agosto, 2019 - 23:50
Chemist and YouTube presenter talks about his road to chemistry and the magic of the elements

Life as an element discoverer, by Julie Ezold

Chemical News - 4 agosto, 2019 - 23:50
Oak Ridge National Lab program manager describes how being part of the team that synthesized element 117, tennessine, changed her life

The rewards and challenges of expanding the periodic table, by Hiromitsu Haba

Chemical News - 4 agosto, 2019 - 23:50
Riken group director shares the thrill of creating nihonium and the drive to keep pushing the table's boundaries

Science historian Eric Scerri examines the periodic table's quantum connections

Chemical News - 4 agosto, 2019 - 23:50
UCLA chemist talks about his love of the table and why debate still rages over it

How the periodic table inspired Mary Soon Lee to an epic feat of haiku

Chemical News - 4 agosto, 2019 - 23:50
Writer and poet describes her journey immortalizing all 118 elements with their own Japanese-style poem

From our archives: An essay on antimony, by Nina Ulrich

Chemical News - 4 agosto, 2019 - 23:44
To celebrate the International Year of the Periodic Table, C&EN is re-releasing its favorite essays from a special 2003 collectors' issue celebrating the elements

Your guide to the ACS Fall 2019 National Meeting in San Diego

Chemical News - 4 agosto, 2019 - 23:31
C&EN's editors pick the speakers and symposia to catch

Contract research organizations profit from nonprofits' drug-discovery efforts

Chemical News - 4 agosto, 2019 - 23:30
Although the financial returns are not always high, CROs find value in working with foundations

Palmer amaranth, the king of weeds, cripples new herbicides

Chemical News - 3 agosto, 2019 - 15:12
Scientists in the US sound the alarm about a crop-smothering weed that is growing resistant to multiple herbicides

Rusty film generates salty shock

Chemical News - 3 agosto, 2019 - 13:51
Metal nanolayer produces electricity from flowing brine

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