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Yangde Ma, Xiaoping Dai, Mengzhao Liu, Jiaxi Yong, Hongyan Qiao, Axiang Jin, Zhanzhao Li, Xingliang Huang, Hai Wang, Xin Zhang
Hydrogen produced from electrocatalytic water splitting is a promising route due to the sustainable powers derived from the solar and wind energy. However, the sluggish kinetics at the anode for water splitting makes the highly effective and inexpensive electrocatalysts desirable in oxygen evolution reaction (OER) by structure and composition modulations. Metal-organic frameworks (MOFs) have been intensively used as the templates/precursors to synthesize complex hollow structures for various energy-related applications...
December 9, 2016: ACS Applied Materials & Interfaces
Hsin-Yi Wang, Sung-Fu Hung, Ying-Ya Hsu, Lulu Zhang, Jianwei Miao, Ting-Shan Chan, Qihua Xiong, Bin Liu
The formation of μ-OO peroxide (Co-OO-Co) moieties on spinel Co3O4 electrocatalyst prior to the rise of the electrochemical oxygen evolution reaction (OER) current was identified by in situ spectroscopic methods. Through a combination of independent in situ X-ray absorption, grazing-angle X-ray diffraction, and Raman analysis, we observed a clear coincidence between the formation of μ-OO peroxide moieties and the rise of the anodic peak during OER. This finding implies that a chemical reaction step could be generally ignored before the onset of OER current...
December 1, 2016: Journal of Physical Chemistry Letters
Wei Sun, Ji-Yuan Liu, Xue-Qing Gong, Waqas-Qamar Zaman, Li-Mei Cao, Ji Yang
The anodic reaction of oxygen evolution reaction (OER), an important point for electrolysis, however, remains the obstacle due to its complicated reaction at electrochemical interfaces. Iridium oxide (IrO2) is the only currently known 5d transition metal oxide possessing admirable OER activity. Tremendous efforts have been carried out to enhance the activity of iridium oxides. Unfortunately there lies a gap in understanding what factors responsible for the activity in doped IrO2 or the novel crystal structure...
December 2, 2016: Scientific Reports
Pengzuo Chen, Tianpei Zhou, Lili Xing, Kun Xu, Yun Tong, Hui Xie, Lidong Zhang, Wensheng Yan, Wangsheng Chu, Changzheng Wu, Yi Xie
Rational design of non-noble materials as highly efficient, economical, and durable bifunctional catalysts for oxygen evolution and reduction reactions (OER/ORR) is currently a critical obstacle for rechargeable metal-air batteries. A new route involving S was developed to achieve atomic dispersion of Fe-Nx species on N and S co-decorated hierarchical carbon layers, resulting in single-atom bifunctional OER/ORR catalysts for the first time. The abundant atomically dispersed Fe-Nx species are highly catalytically active, the hierarchical structure offers more opportunities for active sites, and the electrical conductivity is greatly improved...
December 2, 2016: Angewandte Chemie
Chun-Chao Hou, Chuan-Jun Wang, Qian-Qian Chen, Xiao-Jun Lv, Wen-Fu Fu, Yong Chen
One-dimensional core-shell nanowire materials have recently received great attention as durable catalysts for water splitting. Herein we report the facile and rapid synthesis of ultralong Fe(OH)3:Cu(OH)2 core-shell nanowires grown in situ on an open 3D electrode to function as a highly efficient electrocatalyst for water oxidation. It only requires an overpotential of ∼365 mV to reach a 10 mA cm(-2) current density in 1.0 M KOH. As far as we know, this shows the best result amongst Cu-based heterogeneous OER systems reported to date...
December 1, 2016: Chemical Communications: Chem Comm
J van Rosmalen, J A H van Oers
A 37-year-old male was admitted to the Intensive Care Unit with severe traumatic brain injury. Propofol, midazolam and sufentanil were administered. Two days after admittance, we observed a green discoloration of the urine. This is a rare and benign side effect of propofol.
2016: Nederlands Tijdschrift Voor Geneeskunde
Svetoslava Vankova, Carlotta Francia, Julia Amici, Juqin Zeng, Silvia Bodoardo, Nerino Penazzi, Gillian Collins, Hugh Geaney, Colm O'Dwyer
Li-O2 battery research at a fundamental level remains critical, and nature of reactions and stability are paramount for realising the promise of the Li-O2 system. We report that ITO nanocrystals with supported 1-2 nm OER catalyst Ru/RuOx nanoparticles demonstrate efficient OER processes, significantly reducing the cell's recharge overpotential, and maintain catalytic activity to promote a consistent cycling discharge potential in Li-O2 cells even when the ITO support nanocrystals deteriorate from the very first cycle...
November 29, 2016: ChemSusChem
Huanhuan Shi, Hanfeng Liang, Fangwang Ming, Zhoucheng Wang
Herein we report the control synthesis of lepidocrocite VOOH hollow nanospheres and further their applications in electrocatalytic water splitting for the first time. By tuning the surface area of the nanospheres, the optimal performance can be achieved with low overpotentials of 270 mV for the oxygen evolution reaction (OER) and 164 mV for the hydrogen evolution reaction (HER) at 10 mA cm(-2) in 1 m KOH, respectively. Furthermore, when used as both the anode and cathode for overall water splitting, a low cell voltage of 1...
November 29, 2016: Angewandte Chemie
Xu Zhao, Hantao Zhang, Yu Yan, Jinhua Cao, Xingqi Li, Shiming Zhou, Zhenmeng Peng, Jie Zeng
Precisely engineering the electrical conductivity represents a promising strategy to design efficient catalysts towards oxygen evolution reaction (OER). Here, we demonstrate a versatile partial cation exchange method to fabricate lamellar Ag-CoSe2 nanobelts with controllable conductivity. The electrical conductivity of the materials was significantly enhanced by the addition of Ag(+) cations of less than 1.0 %. Moreover, such a trace amount of Ag induced a negligible loss of active sites which was compensated through the effective generation of active sites as shown by the excellent conductivity...
November 29, 2016: Angewandte Chemie
Ikuya Yamada, Hiroshi Fujii, Akihiko Takamatsu, Hidekazu Ikeno, Kouhei Wada, Hirofumi Tsukasaki, Shogo Kawaguchi, Shigeo Mori, Shunsuke Yagi
Bifunctional electrocatalysts for oxygen evolution/reduction reaction (OER/ORR) are desirable for the development of energy conversion technologies. It is discovered that the manganese quadruple perovskites CaMn7 O12 and LaMn7 O12 show bifunctional catalysis in the OER/ORR. A possible origin of high OER activity is the unique surface structure through corner-shared planar MnO4 and octahedral MnO6 units to promote direct OO bond formations.
November 25, 2016: Advanced Materials
Pingwei Cai, Yuan Hong, Suqin Ci, Zhenhai Wen
Electrochemical catalysis of O2-incorporated reactions is a promising strategy for metal-air batteries. The performance of metal-air batteries is determined by the catalytic activities of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Therefore, developing efficient catalysts with superior activities for the ORR and OER is of great significance to expand the application range of metal-air batteries. Herein, CoFe alloy nanoparticles adhered to the inside wall of nitrogen doped carbon nanotubes (CoFe@NCNTs) are synthesized and can function as a Janus particle to efficiently catalyze the ORR and OER with desirable activities in 0...
November 24, 2016: Nanoscale
Yang Li, Kurian A Kuttiyiel, Lijun Wu, Yimei Zhu, Etsuko Fujita, Radoslav R Adzic, Kotaro Sasaki
We report the synthesis and characterization of graphene-supported cobalt manganese oxynitride nanocatalysts (CoMnON/G) as bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). A nitriding treatment of spinel compound CoMnO increases the ORR activity considerably, and the most active material catalyzes the ORR with only a 30 mV half-wave potential difference from the commercial carbon-supported platinum (Pt/C) in alkaline media. In addition to high activity, the catalyst also exhibits an intrinsic stability that outperforms Pt/C...
November 21, 2016: ChemSusChem
Fengkai Yang, Kirill Sliozberg, Ilya Sinev, Hendrik Antoni, Alexander Bähr, Kevin Ollegott, Wei Xia, Justus Masa, Wolfgang Grünert, Beatriz Roldan Cuenya, Wolfgang Schuhmann, Martin Muhler
Co-based layered double hydroxides (LDH) catalysts with Fe and Al contents in the range from 15 to 45 at% were synthesized by an efficient co-precipitation method. In these catalysts, Fe3+ or Al3+ ions play an essential role as trivalent species to stabilize the LDH structure. The obtained catalysts were characterized by a comprehensive combination of surface- and bulk-sensitive techniques and evaluated for the oxygen evolution reaction (OER) on rotating disk electrodes. The OER activity decreased with increasing Al content for the Co- and Al-based LDH catalysts, whereas a synergistic effect in Co- and Fe-based LDHs was observed resulting in an optimal Fe content of 35 at%...
November 18, 2016: ChemSusChem
Susanna Nordin, Kevin McKee, Maria Wallinder, Lena von Koch, Helle Wijk, Marie Elf
The physical environment is of particular importance for supporting activities and interactions among older people living in residential care facilities (RCFs) who spend most of their time inside the facility. More knowledge is needed regarding the complex relationships between older people and environmental aspects in long-term care. The present study aimed to explore how the physical environment influences resident activities and interactions at two RCFs by using a mixed-method approach. Environmental assessments were conducted via the Swedish version of the Sheffield Care Environment Assessment Matrix (S-SCEAM), and resident activities, interactions and locations were assessed through an adapted version of the Dementia Care Mapping (DCM)...
November 16, 2016: Scandinavian Journal of Caring Sciences
Junli Liu, Yong Yang, Bing Ni, Haoyi Li, Xun Wang
Fullerene-like nickel oxysulfide hollow nanospheres with ≈50 nm are constructed by in situ growth on the surface of nickel foam by taking advantage of solvothermal reaction. The as-prepared composite exhibits exhilaratingly high HER and OER performance in 1 m KOH, which opens up a very promising aspect for non-noble metal chalcogenides as bifunctional electrocatalysts.
November 18, 2016: Small
Yuan Sun, Chunde Wang, Tao Ding, Jian Zuo, Qing Yang
With the socio economic development, people have paid more and more attention to energy source problems, especially to clean and renewable energy such as hydrogen. It is appealing but still challenging to find or design an appropriate catalyst which is inexpensive and efficient for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte. In this work, we develop a facile synthesis of amorphous defect-rich CoMoS4via a one-step hydrothermal method, and under alkaline conditions; the CoMoS4 electrode can generate a current density of 10 mA cm(-2) at the overpotentials of 143 mV for HER and 342 mV for OER in 1...
December 7, 2016: Nanoscale
Zhuoxun Yin, Chunling Zhu, Chunyan Li, Shen Zhang, Xitian Zhang, Yujin Chen
To improve the efficiency of overall water splitting, highly active and stable bifunctional electrocatalysts are highly desirable. Herein, we fabricated mixed Ni-Co phosphides (Ni1-xCox-P) as bifunctional catalysts for overall water splitting. Structural characterizations indicated that the Ni1-xCox-P catalysts (0 > x > 1) exhibited hierarchical yolk-shelled morphologies, with a total diameter of 1-2 μm. Interestingly, the shell was assembled by numerous nanosheets with a thickness less than 10 nm. The electrochemical measurements indicated that the Ni1-xCox-P catalysts (0 < x < 1) showed significantly enhanced OER and HER activities in comparison to the pure Ni-P and Co-P catalysts, and the highest OER and HER activities were achieved as x = 0...
December 7, 2016: Nanoscale
Xiangjun Zheng, Xuecheng Cao, Xiaowei Li, Jinghua Tian, Chao Jin, Ruizhi Yang
Nitrogen-doped carbon hollow cubes (NCHCs) are fabricated from biomass l-lysine monohydrochloride via a facile and low-cost NaCl template process, showing efficient bifunctional electrocatalytic activities towards the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The resultant lysine-derived carbon hollow cubes with hierarchical pores on the wall are conducive to mass transport and high utilization of nitrogen dopant-induced active sites during the electrocatalytic process. When used as electrocatalysts for the ORR, an onset potential of 0...
November 8, 2016: Nanoscale
Bo-Quan Li, Cheng Tang, Hao-Fan Wang, Xiao-Lin Zhu, Qiang Zhang
Perovskite oxides with poor conductivity call for three-dimensional (3D) conductive scaffolds to demonstrate their superb reactivities for oxygen evolution reaction (OER). However, perovskite formation usually requires high-temperature annealing at 600° to 900°C in air, under which most of the used conductive frameworks (for example, carbon and metal current collectors) are reductive and cannot survive. We propose a preoxidization coupled electrodeposition strategy in which Co(2+) is preoxidized to Co(3+) through cobalt Fenton reaction in aqueous solution, whereas the reductive nickel framework is well maintained during the sequential annealing under nonoxidative atmosphere...
October 2016: Science Advances
Ahmed Ziani, Tatsuya Shinagawa, Liga Stegenburga, Kazuhiro Takanabe
The decoration of (photo-) electrodes for efficient photoresponse requires the use of electrocatalysts with good dispersion and high transparency for efficient light absorption by the photoelectrode. As a result of the ease of thermal evaporation and particulate self-assembly growth, the phthalocyanine molecular species can be uniformly deposited layer-by-layer on the surface of substrates. This structure can be used as a template to achieve a tunable amount of catalysts, high dispersion of the nanoparticles and transparency of the catalysts...
November 4, 2016: ACS Applied Materials & Interfaces
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