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copper water splitting

Bing Chang, Shuai Hao, Zhixiang Ye, Yingchun Yang
Energy-efficient electrochemical water splitting is one important way to produce hydrogen fuel but still faces many challenges. In this communication, we report that an amorphous Ni-P alloy shell electrodeposited on a CuO nanowire array supported on copper foam (CuO@Ni-P NA/CF) can be used for efficient water splitting in alkaline media. As a 3D catalytic electrode, it exhibits excellent activity both for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) with overpotentials of 106 mV for HER and 275 mV for OER to achieve a current density of 30 mA cm-2 in 1...
March 1, 2018: Chemical Communications: Chem Comm
Peili Zhang, Lin Li, Dennis Nordlund, Hong Chen, Lizhou Fan, Biaobiao Zhang, Xia Sheng, Quentin Daniel, Licheng Sun
Electrochemical water splitting requires efficient water oxidation catalysts to accelerate the sluggish kinetics of water oxidation reaction. Here, we report a promisingly dendritic core-shell nickel-iron-copper metal/metal oxide electrode, prepared via dealloying with an electrodeposited nickel-iron-copper alloy as a precursor, as the catalyst for water oxidation. The as-prepared core-shell nickel-iron-copper electrode is characterized with porous oxide shells and metallic cores. This tri-metal-based core-shell nickel-iron-copper electrode exhibits a remarkable activity toward water oxidation in alkaline medium with an overpotential of only 180 mV at a current density of 10 mA cm-2 ...
January 26, 2018: Nature Communications
Steffen Czioska, Jianying Wang, Xue Teng, Shangshang Zuo, Songhai Xie, Zuofeng Chen
Photosynthesis in plants occurs at structures which form by self-assembly under ambient conditions, while catalysts used for artificial photosynthesis normally need special conditions like high pressure or temperature. Herein, a facile and cost effective way for the synthesis of a highly complex and efficient oxygen evolution reaction (OER) catalyst, formed solely by self-assembly in solution, is presented. Without the need for any instrumentation except for a glass beaker, highly active nickel-iron-copper multi-shell nanotube arrays are produced by immersion of a copper plate in three different solutions...
January 25, 2018: Nanoscale
Mohamad Mohsen Momeni, Yousef Ghayeb, Farzaneh Ezati
Tungsten-copper co-sensitized TiO2 nanotube films on titanium substrate, used as photoanodes in photoelectrochemical (PEC) water splitting to produce hydrogen, have been synthesized via anodization and chemical bath deposition (CBD) methods. Field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) were used to study the morphology and elemental composition of the synthetic samples. UV-Vis diffuse reflection spectroscopy (UV-Vis DRS) was sued to investigate the optical features of the samples...
March 15, 2018: Journal of Colloid and Interface Science
Juan-Jesús Velasco-Vélez, Katarzyna Skorupska, Elias Frei, Yu-Cheng Huang, Chung-Li Dong, Bing-Jian Su, Cheng-Jhih Hsu, Hung-Yu Chou, Jin-Ming Chen, Peter Strasser, Robert Schlögl, Axel Knop-Gericke, Cheng-Hao Chuang
The electrodeposition nature of copper on a gold electrode in a 4.8 pH CuSO4 solution was inquired using X-ray absorption spectroscopy, electrochemical quartz crystal microbalance, and thermal desorption spectroscopy techniques. Our results point out that the electrodeposition of copper prompts the formation of stable oxi-hydroxide species with a formal oxidation state Cu(+) without the evidence of metallic copper formation (Cu(0)). Moreover, the subsequent anodic polarization of Cu2Oaq yields the formation of CuO, in the formal oxidation state Cu(2+), which is dissolved at higher anodic potential...
November 2, 2017: Journal of Physical Chemistry. B
L-T Neustädter, J Kamphues, C Ratert
In this study, influences of a reduced macromineral intake on the trace element metabolism in horses at maintenance were investigated. Background of this study is the revised recommendation on the macromineral supply for horses (GfE ). Balance studies on three adult pony geldings with body weights of 405 / 348 / 384 kg were performed to obtain data on apparent digestibility (aD), retention and serum concentrations of different trace elements (Cu, Zn, Se) at different dietary macromineral levels. A mineral supplement or a complementary feed-with a reduced macromineral content-was added to a hay-based diet (daily 5...
April 2018: Journal of Animal Physiology and Animal Nutrition
Dongying Shi, Rui Zheng, Ming-Jun Sun, Xinrui Cao, Chun-Xiao Sun, Chao-Jie Cui, Chun-Sen Liu, Junwei Zhao, Miao Du
As the first example of a photocatalytic system for splitting water without additional cocatalysts and photosensitizers, the comparatively cost-effective Cu2 I2 -based MOF, Cu-I-bpy (bpy=4,4'-bipyridine) exhibited highly efficient photocatalytic hydrogen production (7.09 mmol g-1  h-1 ). Density functional theory (DFT) calculations established the electronic structures of Cu-I-bpy with a narrow band gap of 2.05 eV, indicating its semiconductive behavior, which is consistent with the experimental value of 2...
November 13, 2017: Angewandte Chemie
Lidija Androš Dubraja, Marijana Jurić, Filip Torić, Damir Pajić
The reaction of bis(phenanthroline)metal(ii) cations (M = Mn2+ , Co2+ , Ni2+ , Cu2+ and Zn2+ ) with bis(oxalato)chromium(iii) anions in a water/ethanol solution gives rise to a series of compounds with oxalate-bridged cations, [{M(phen)2 }2 (μ-C2 O4 )][Cr(phen)(C2 O4 )2 ]2 ·4H2 O [Mn2 Cr2 (1), Co2 Cr2 (2), Ni2 Cr2 (3), Cu2 Cr2 (4) and Zn2 Cr2 (5)]. Their structural analysis reveals that all the prepared compounds crystallize in the triclinic system, space group P1[combining macron], having similar unit cell parameters, molecular structures and crystal packing features...
September 12, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Bo You, Xuan Liu, Guoxiang Hu, Sheraz Gul, Junko Yano, De-En Jiang, Yujie Sun
The development of low-cost hybrid water splitting-biosynthetic systems that mimic natural photosynthesis to achieve solar-to-chemical conversion is of great promise for future energy demands, but often limited by the kinetically sluggish hydrogen evolution reaction (HER) on the surface of nonprecious transition metal catalysts in neutral media. It is thus highly desirable to rationally tailor the reaction interface to boost the neutral HER catalytic kinetics. Herein, we report a general surface nitrogen modification of diverse transition metals (e...
August 22, 2017: Journal of the American Chemical Society
Kaixv Ren, Pengfei Yin, Yuzhu Zhou, Xingzhong Cao, Cunku Dong, Lan Cui, Hui Liu, Xiwen Du
Surficial defects in semiconductor can induce high density of carriers and cause localized surface plasmon resonance which is prone to light harvesting and energy conversion, while internal defects may cause serious recombination of electrons and holes. Thus, it is significant to precisely control the distribution of defects, although there are few successful examples. Herein, an effective strategy to confine abundant defects within the surface layer of Cu1.94 S nanoflake arrays (NFAs) is reported, leaving a perfect internal structure...
July 19, 2017: Small
Samit Majumder, Ashraf Abdel Haleem, Perumandla Nagaraju, Yoshinori Naruta
The development of low-cost, stable bifunctional electrocatalysts, which operate in the same electrolyte with a low overpotential for water splitting, including the oxygen evolution reaction and the hydrogen evolution reaction, remains an attractive prospect and a great challenge. In this study, a water soluble Robson-type macrocyclic dicopper(ii) complex has been used for the first time as a catalyst precursor for the generation of a copper-based bifunctional heterogeneous catalyst film, which can be used for both HER and OER at a near neutral pH...
July 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Ayon Karmakar, Suneel Kumar Srivastava
The present work is focused on the protective-agent-free synthesis of interconnected copper cobaltite (Cu0.3Co2.7O4) nanochains by temperature-controlled solvothermal method followed by post-thermal treatment of the precursors. Furthermore, Cu0.3Co2.7O4 interconnected nanochains are employed as electrocatalyst for water oxidation in alkaline medium for the first time. Extensive studies of physiochemical properties showed the formation of interconnected 1D nanochains of Cu0.3Co2.7O4 exhibiting a larger specific surface area (139...
July 12, 2017: ACS Applied Materials & Interfaces
Allison C Cardiel, Kenneth J McDonald, Kyoung-Shin Choi
New electrochemical synthesis methods were developed to produce copper hydroxy double salt(Cu-HDS) films with four different intercalated anions (NO3(-), SO4(2-), Cl(-), and dodecyl sulfate (DS)) as pure crystalline films as deposited (Cu2NO3(OH)3, Cu4SO4(OH)6, Cu2Cl(OH)3, and Cu2DS(OH)3). These methods are based on p-benzoquinone reduction, which increases the local pH at the working electrode and triggers the precipitation of Cu(2+) and appropriate anions as Cu-HDS films on the working electrode. The resulting Cu-HDS films could be converted to crystalline Cu(OH)2 and CuO films by immersing them in basic solutions...
June 1, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Xiaoqiang Du, Jingwei Huang, Yong Ding
Developing noble metal-free water oxidation catalysts is essential for many energy conversion/storage processes (e.g., water splitting). Herein, we report a facile synthesis of CuO microspheres composed of ultrathin, single-crystal-like nanosheets via a simple solution method. The as-obtained CuO microspheres can serve as an active and stable water oxidation catalyst under electrochemical reaction conditions, owing to their unique structural features. In electrochemical water oxidation, this catalyst affords a current density of 10 mA cm-2 (a value related to practical relevance) at an overpotential of ∼0...
June 6, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Cláudio M Lousada, Adam Johannes Johansson, Pavel A Korzhavyi
We performed a density functional theory (DFT) investigation of the molecular and dissociative adsorption of H2 O and H2 S at perfect and defective Cu(110) surfaces described using supercells with c(6 × 6) periodicity. The defective surface consists of a terrace surrounded by pits. We found considerable differences in adsorption modes and energies for H2 O and H2 S. At the defective Cu(110) surface, monomers of H2 O and H2 S preferentially adsorb at the terrace site and molecular adsorption of H2 O is significantly more favorable than that of H2 S...
March 15, 2017: Physical Chemistry Chemical Physics: PCCP
Li Wei, Kunli Goh, Özgür Birer, H Enis Karahan, Jian Chang, Shengli Zhai, Xuncai Chen, Yuan Chen
Electrochemical splitting of water to produce oxygen (O2) and hydrogen (H2) through a cathodic hydrogen evolution reaction (HER) and an anodic oxygen evolution reaction (OER) is a promising green approach for sustainable energy supply. Here we demonstrated a porous nickel-copper phosphide (NiCuP) nano-foam as a bifunctional electrocatalyst for highly efficient total water splitting. Prepared from a bubble-templated electrodeposition method and subsequent low-temperature phosphidization, NiCuP has a hierarchical pore structure with a large electrochemical active surface area...
February 13, 2017: Nanoscale
Yipu Liu, Qiuju Li, Rui Si, Guo-Dong Li, Wang Li, Da-Peng Liu, Dejun Wang, Lei Sun, Yu Zhang, Xiaoxin Zou
Superefficient water-splitting materials comprising sub-nanometric copper clusters and quasi-amorphous cobalt sulfide supported on copper foam are reported. While working together at both the anode and cathode sides of an alkaline electrolyzer, this material gives a catalytic output of overall water splitting comparable with the Pt/C-IrO2 -coupled electrolyzer.
April 2017: Advanced Materials
Hu Chen, Yan Gao, Licheng Sun
Water splitting is of paramount importance for exploiting renewable energy-conversion and -storage systems, but is greatly hindered by the kinetically sluggish oxygen evolution reaction (OER). In this work, a three-dimensional, highly efficient, and durable NiFe/Cu2 O nanowires/Cu foam anode (NiFe/Cu2 O NWs/CF) for water oxidation in 1.0 m KOH was developed. The obtained electrode exhibited a current density of 10 mA cm-2 at a uniquely low overpotential of η=215 mV. The average specific current density (js ) was estimated, on the basis of the electrocatalytically active surface area, to be 0...
April 10, 2017: ChemSusChem
Minwei Zhang, Chengyi Hou, Arnab Halder, Qijin Chi
Thanks to their versatile functionality, metal oxides (MOs) constitute one of the key family materials in a variety of current demands for sensor, catalysis, energy storage and conversion, optical electronics, and piezoelectric mechanics. Much effort has focused on engineering specific nanostructure and macroscopic morphology of MOs that aims to enhance their performances, but the design and controlled synthesis of ultrafine nanostructured MOs in a cost-effective and facile way remains a challenge. In this work, we have exploited the advantages of intrinsic structures of graphene oxide (GO) papers, serving as a sacrificial template, to design and synthesize two-dimensional (2D) layered and free-standing MO papers with ultrafine nanostructures...
February 1, 2017: ACS Applied Materials & Interfaces
Bohdan Ardan, Vasyl Kinzhybalo, Yurii Slyvka, Olga Shyyka, Mykhaylo Luk Yanov, Tadeusz Lis, Marian Mys Kiv
As an important class of heterocyclic compounds, 1,3,4-thiadiazoles have a broad range of potential applications in medicine, agriculture and materials chemistry, and were found to be excellent precursors for the crystal engineering of organometallic materials. The coordinating behaviour of allyl derivatives of 1,3,4-thiadiazoles with respect to transition metal ions has been little studied. Five new crystalline copper(I) π-complexes have been obtained by means of an alternating current electrochemical technique and have been characterized by single-crystal X-ray diffraction and IR spectroscopy...
January 1, 2017: Acta Crystallographica. Section C, Structural Chemistry
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