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Michael Ertl, Corina Andronescu, Jonathon Moir, Mirijam Zobel, Friedrich E Wagner, Stefan Barwe, Geoffrey Ozin, Wolfgang Schuhmann, Josef Breu
Mössbauerite is investigated for the first time as an "iron only" mineral for the electrocatalytic oxygen evolution reaction in alkaline media. The synthesis proceeds via intermediate mixed-valence green rust that is rapidly oxidized in situ while conserving the layered double hydroxide structure. The material catalyzes the oxygen evolution reaction on a glassy carbon electrode with a current density of 10 mA cm-2 at 1.63 V versus the reversible hydrogen electrode. Stability measurements as well as post-electrolysis characterization are presented...
April 20, 2018: Chemistry: a European Journal
Niall Kirkaldy, Greig Chisholm, Jia-Jia Chen, Leroy Cronin
Hydrogen is seen as a sustainable fuel of the future, yet the vast majority of global hydrogen production comes from the reformation of fossil fuels. Electrolytic water splitting using proton exchange membrane electrolysers (PEMEs) provides a pathway to sustainable hydrogen production through coupling to renewable energy sources, but can suffer from gas crossover at low current densities and high operating pressures, causing explosive gas mixtures and decreasing cell lifetimes. Here we demonstrate the application of a highly stable, organic electron-coupled proton buffer (ECPB) which allows the decoupling of hydrogen and oxygen production during water splitting...
February 14, 2018: Chemical Science
Afriyanti Sumboja, Tao An, Hai Yang Goh, Mechthild Lübke, Dougal Peter Howard, Yijie Xu, Albertus Denny Handoko, Yun Zong, Zhaolin Liu
Catalysts for hydrogen evolution reaction (HER) are in demand to realize the efficient conversion of hydrogen via water electrolysis. In this work, cobalt phosphides were prepared using a one-step, scalable and direct gas-solid phosphidation of commercially available cobalt salts. It was found that the effectiveness of the phosphidation reaction was closely related to the state of cobalt precursors at the reaction temperature. For instance, high yield of cobalt phosphides obtained from the phosphidation of cobalt (II) acetate was related to the good stability of cobalt salt at the phosphidation temperature...
April 19, 2018: ACS Applied Materials & Interfaces
Jinhai Lu, Changli Zhu, Changchang Pan, Wenlie Lin, John P Lemmon, Fanglin Chen, Chunsen Li, Kui Xie
Reforming CH4 into syngas using CO2 remains a fundamental challenge due to carbon deposition and nanocatalyst instability. We, for the first time, demonstrate highly efficient electrochemical reforming of CH4 /CO2 to produce syngas in a solid oxide electrolyser with CO2 electrolysis in the cathode and CH4 oxidation in the anode. In situ exsolution of an anchored metal/oxide interface on perovskite electrode delivers remarkably enhanced coking resistance and catalyst stability. In situ Fourier transform infrared characterizations combined with first principle calculations disclose the interface activation of CO2 at a transition state between a CO2 molecule and a carbonate ion...
March 2018: Science Advances
Fengmin Du, David Warsinger, Tamanna Urmi, Gregory P Thiel, Amit Kumar, John H Lienhard
The ability to increase pH is a crucial need for desalination pretreatment (especially in reverse osmosis) and for other industries, but processes used to raise pH often incur significant emissions and non-renewable resource use. Alternatively, waste brine from desalination can be used to create sodium hydroxide, via appropriate concentration and purification pretreatment steps, for input into the chlor-alkali process. In this work, an efficient process train (with variations) is developed and modeled for sodium hydroxide production from seawater desalination brine using membrane chlor-alkali electrolysis...
April 18, 2018: Environmental Science & Technology
Matthew J Chalkley, Trevor J Del Castillo, Benjamin D Matson, Jonas C Peters
Substrate selectivity in reductive multi-electron/proton catalysis with small molecules such as N2, CO2, and O2 is a major challenge for catalyst design, especially where the competing hydrogen evolution reaction (HER) is thermo-dynamically and kinetically competent. In this study, we investigate how the selectivity of a tris(phosphine)borane iron(I) catalyst, P3BFe+, for catalyzing the nitrogen reduction reaction (N2RR, N2-to-NH3 conversion) versus HER changes as a function of acid pKa. We find that there is a strong correlation between pKa and N2RR efficiency...
April 18, 2018: Journal of the American Chemical Society
Yan Gao, Wen Zhang, Bin Gao, Wen Jia, Aijun Miao, Lin Xiao, Liuyan Yang
Electrolysis combined with biochar (BC) was used in a constructed wetland to intensify nitrogen (N) and phosphorus (P) removal from wastewater simultaneously. A pilot study was conducted using an electrolysis-integrated, BC-amended, horizontal, subsurface-flow, constructed wetland (E-BHFCW). The research results showed that both electrolysis and BC substrate played important roles in the intensified, constructed wetland. The electrolysis combined BC substrate greatly enhanced the removal rates of nitrate (49...
April 4, 2018: Water Research
Sajad Ahmad Bhat, Nusrat Rashid, Mudasir Ahmad Rather, Sarwar Ahmad Pandit, Ghulam Mohammad Rather, Pravin P Ingole, Mohsin Ahmad Bhat
The recent reports about the promising and tuneable electrocatalytic activity and stability of nanoalloys have stimulated an intense research activity towards the design and synthesis of homogenously alloyed novel bimetallic nano-electrocatalysts. We, herein present a simple one-pot facile wet-chemical approach for the deposition of high quality bimetallic palladium-silver (PdAg) homogenous nanoalloy crystals on reduced graphene oxide (Gr) sheets. Morphological, structural and chemical characterization of the so crafted nanohybrids establishes a homogeneous distribution of 1:1 PdAg nanoalloy crystals supported over reduced graphene oxide (PdAg-Gr)...
April 16, 2018: ACS Applied Materials & Interfaces
Weiwei Mao, Haiping He, Pengcheng Sun, Zhizhen Ye, Jingyun Huang
A facile and scalable in situ micro-electrolysis nanofabrication technique is developed for preparing crosslinked Ni(OH)2 nanosheets on a novel 3D porous nickel template (Ni(OH)2@3DPN). For the constructed template, the porogen of NaCl particles not only induce a self-limiting surficial hot corrosion to claim the "start engine stop" mechanism, but also serve as the primary battery electrolyte to greatly accelerate the growth of Ni(OH)2. As far as we know, the micro-electrolysis nanofabrication is superior to the other reported Ni(OH)2 synthesis methods due to the mild condition (60 ℃, 6 h, NaCl solution, ambient environment) and without any post treatment...
April 13, 2018: ACS Applied Materials & Interfaces
Xuegeng Yang, Dominik Baczyzmalski, Christian Cierpka, Gerd Mutschke, Kerstin Eckert
Electrolytic gas evolution is a fundamental phenomenon occurring in a large number of industrial applications. In these processes gas bubbles are formed at the electrode from a supersaturated solution. Since dissolved gases can change the surface tension, a gas concentration gradient may cause the surface tension to vary locally at the interface of the gas bubble. Surface tension gradients may also form due to temperature gradients generated by ohmic heating of the electrolyte. In both cases, the resulting shear stress imposes a convection in the electrolyte and the gas bubble (Marangoni effect)...
April 13, 2018: Physical Chemistry Chemical Physics: PCCP
Samuel Melaku, Zewdu Gebeyehu, Rajeev B Dabke
A gravimetric method for the quantitative assessment of the products of electrolysis of water is presented. In this approach, the electrolysis cell was directly powered by 9 V batteries. Prior to electrolysis, a known amount of potassium hydrogen phthalate (KHP) was added to the cathode compartment, and an excess amount of KHCO3 was added to the anode compartment electrolyte. During electrolysis, cathode and anode compartments produced OH- (aq) and H+ (aq) ions, respectively. Electrolytically produced OH- (aq) neutralized the KHP, and the completion of this neutralization was detected by a visual indicator color change...
2018: Journal of Analytical Methods in Chemistry
Ruosong Xie, Miaomiao Wu, Guangfei Qu, Ping Ning, Yingying Cai, Pei Lv
A newly designed electric assisted micro-electrolysis filter (E-ME) was developed to investigate its degradation efficiency for coking wastewater and correlated characteristics. The performance of the E-ME system was compared with separate electrolysis (SE) and micro-electrolysis (ME) systems. The results showed a prominent synergistic effect on COD removal in E-ME systems. Gas chromatography/mass spectrometry (GC-MS) analysis confirmed that the applied electric field enhanced the degradation of phenolic compounds...
April 2018: Journal of Environmental Sciences (China)
Jorge Vidal, Cesar Huiliñir, Rocío Santander, Javier Silva-Agredo, Ricardo A Torres-Palma, Ricardo Salazar
The elimination of the antibiotic Nafcillin (NAF), which is usually used in hospitals and veterinary clinics around the world, was assessed through a combination of three advanced electrochemical oxidation processes followed by anaerobic digestion process. In the first stage different electrochemical advanced oxidation processes (EAOPs) were used: electro-oxidation with hydrogen peroxide (EO-H2 O2 ), electro-Fenton (EF) and Photo electro-Fenton (PEF). After PEF, almost complete and highly efficient degradation and elimination of NAF was achieved, with the concomitant elimination of the associated antimicrobial activity...
May 15, 2018: Science of the Total Environment
Guangxin Wang, Yunchao Zhao, Bin Yang, Yongfa Song
BACKGROUND: High purity cobalt has many important applications, such as magnetic recording media, magnetic recording heads, optoelectronic devices, magnetic sensors, and integrated circuits, etc. To produce 5N or higher purity cobalt in an electro-refining process, one of the challenges is to effectively reduce the Fe content of aqueous cobalt salt solution before electrolysis. This paper describes thermodynamic and kinetic investigations of the Fe adsorption process of a new sulfonated monophosphonic resin with the trade mark Monophos...
January 2018: Journal of Applied Biomaterials & Functional Materials
Na Han, Yu Wang, Hui Yang, Jun Deng, Jinghua Wu, Yafei Li, Yanguang Li
Electrocatalytic carbon dioxide reduction to formate is desirable but challenging. Current attention is mostly focused on tin-based materials, which, unfortunately, often suffer from limited Faradaic efficiency. The potential of bismuth in carbon dioxide reduction has been suggested but remained understudied. Here, we report that ultrathin bismuth nanosheets are prepared from the in situ topotactic transformation of bismuth oxyiodide nanosheets. They process single crystallinity and enlarged surface areas. Such an advantageous nanostructure affords the material with excellent electrocatalytic performance for carbon dioxide reduction to formate...
April 3, 2018: Nature Communications
Xiao Shang, Jun-Feng Qin, Jia-Hui Lin, Bin Dong, Jing-Qi Chi, Zi-Zhang Liu, Lei Wang, Yong-Ming Chai, Chen-Guang Liu
The surface composite and morphology of binary metal sulfides are the key for efficient overall water splitting. However, tuning the morphology and surface composition of binary metal sulfides in a facile way is still a challenge. Herein, binary Fe-Ni sulfides supported on nickel foam (FeNi-S/NF) with different morphology and composition ratio of Fe/Ni have been synthesized through a facile one-step electrodeposition assisted by liquidcrystaltemplate (LCT). The binary FeNi-S has improved activity and conductivity compared to single metal sulfides...
March 26, 2018: Journal of Colloid and Interface Science
Zhihao Yue, Wenxin Zhu, Yuanzhen Li, Ziyi Wei, Na Hu, Yourui Suo, Jianlong Wang
Developing efficient and low-cost oxygen evolution reaction (OER) electrodes is a pressing but still challenging task for energy conversion technologies such as water electrolysis, regenerative fuel cells, and rechargeable metal-air batteries. Hence, this study reports that a nickel oxide-nickel hybrid nanoarray on nickel foam (NiO-Ni/NF) could act as a versatile anode for superior water and urea oxidation. Impressively, this anode could attain high current densities of 50 and 100 mA cm-2 at extremely low overpotentials of 292 and 323 mV for OER, respectively...
April 3, 2018: Inorganic Chemistry
Jin-Xian Feng, Si-Yao Tong, Yexiang Tong, Gao-Ren Li
The search for high active, stable, and cost-efficient hydrogen evolution reaction (HER) electrocatalysts for water electrolysis has attracted great interest. The coordinated water molecules in the hydronium ions will obviously reduce the positive charge density of H+ and hamper H+ to receive electrons from the cathode, leading to large overpotential of HER on non-precious metal catalysts. Here we realize Pt-like hydrogen evolution electrocatalysis on PANI nanodots (NDs)-decorated CoP hybrid nanowires (HNWs) supported on carbon fibers (CFs) (PANI/CoP HNWs-CFs) as PANI can effectively capture H+ from hydronium ions to form protonated amine groups that have higher positive charge density than those of hydronium ions and can be electro-reduced easily...
April 3, 2018: Journal of the American Chemical Society
Clément A Cid, Justin T Jasper, Michael R Hoffmann
Electrolysis of toilet wastewater with TiO2 -coated semiconductor anodes and stainless steel cathodes is a potentially viable onsite sanitation solution in parts of the world without infrastructure for centralized wastewater treatment. In addition to treating toilet wastewater, pilot-scale and bench-scale experiments demonstrated that electrolysis can remove phosphate by cathodic precipitation as hydroxyapatite at no additional energy cost. Phosphate removal could be predicted based on initial phosphate and calcium concentrations, and up to 80% total phosphate removal was achieved...
March 5, 2018: ACS Sustainable Chemistry & Engineering
Ayça Atılır Özcan, Ali Özcan
In this study, mineralization and color removal performance of electro-Fenton method were examined in water containing naphthol blue black (NBB), a diazo dye. NBB was totally converted to intermediate species in a 15-min electrolysis at 60 mA, but complete de-colorization took 180 min. A very high oxidation rate constant ((3.35 ± 0.21) x 1010  M-1 s-1 ) was obtained for NBB, showing its high reactivity towards hydroxyl radicals. A very high total organic carbon (TOC) removal value (45.23 mg L-1 ) was obtained in the first 60 min of the electro-Fenton treatment of an aqueous solution of NBB (0...
March 20, 2018: Chemosphere
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