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Tung Ngoc Pham, Tiva Sharifi, Robin Sandström, William Siljebo, Andrey Shchukarev, Krisztian Kordas, Thomas Wågberg, Jyri-Pekka Mikkola
Herein we report a 3D heterostructure comprising a hierarchical macroporous carbon foam that incorporates mesoporous carbon nanotubes decorated with cobalt oxide nanoparticles as an unique and highly efficient electrode material for the oxygen evolution reaction (OER) in electrocatalytic water splitting. The best performing electrode material showed high stability after 10 h, at constant potential of 1.7 V vs. RHE (reversible hydrogen electrode) in a 0.1 M KOH solution and high electrocatalytic activity in OER with low overpotential (0...
July 21, 2017: Scientific Reports
Meiyong Zheng, Jing Du, Baopu Hou, Cai-Ling Xu
Owing to the unique optical, electronic and catalytic properties, MoS2 have received increasing interests in electrochemical water splitting. Herein, few-layered Mo(1-x)WxS2 hollow nanospheres modified Ni3S2 heterostructures are prepared through a facile hydrothermal method to further enhance the electro-catalytic performance of MoS2. The doping of W element optimizes the electronic structure of MoS2@Ni3S2, thus improves the conductivity and charge transfer ability of MoS2@Ni3S2. In addition, benefiting from the few-layered hollow structure of Mo(1-x)WxS2, the strong electronic interactions between Mo(1-x)WxS2 and Ni3S2, and the hierarchical structure of 1D nanorods and 3D Ni foam, massive active sites and fast ion and charge transportion are obtained...
July 21, 2017: ACS Applied Materials & Interfaces
Dino Klotz, Daniel A Grave, Avner Rothschild
The oxygen evolution reaction (OER) at the surface of semiconductor photoanodes is critical for photoelectrochemical water splitting. This reaction involves photo-generated holes that oxidize water via charge transfer at the photoanode/electrolyte interface. However, a certain fraction of the holes that reach the surface recombine with electrons from the conduction band, giving rise to the surface recombination loss. The charge transfer efficiency, ηt, defined as the ratio between the flux of holes that contribute to the water oxidation reaction and the total flux of holes that reach the surface, is an important parameter that helps to distinguish between bulk and surface recombination losses...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
Pooya Hosseini-Benhangi, Chun Haow Kung, Akram Alfantazi, Elod L Gyenge
High-performance, non-precious metal bifunctional electrocatalysts for oxygen reduction and evolution reactions (ORR and OER, respectively) are of great importance for rechargeable metal-air batteries and regenerative fuel cells. A comprehensive study based on statistical design of experiments is presented to investigate and optimize the surfactant-assisted structure and the resultant bifunctional ORR/OER activity of anodically deposited manganese oxide (MnOx) catalysts. Three classes of surfactants are studied: anionic (sodium dodecyl sulfate, SDS), non-ionic (t Octylphenoxypolyethoxyethanol, Triton X-100) and cationic (cetyltrimethylammonium bromide, CTAB)...
July 18, 2017: ACS Applied Materials & Interfaces
Cuijuan Xuan, Jie Wang, Weiwei Xia, Zongkai Peng, Zexing Wu, Wen Lei, Kedong Xia, Huolin L Xin, Deli Wang
Exploring non-precious metal electrocatalysts to replace the noble metal based catalysts for full water electrocatalysis is still an ongoing challenge. In this work, porous structured ternary nickel-iron-phosphides (Ni-Fe-P) nanocubes were synthesized through one-step phosphidation of Ni-Fe based Prussian blue analogue. The Ni-Fe-P nanocubes exhibit rough and loose porous structure on the surface under suitable phosphating temperature, which is favorable for the mass transfer and oxygen diffusion during electrocatalysis process...
July 18, 2017: ACS Applied Materials & Interfaces
Emiliana Fabbri, Maarten Nachtegaal, Tobias Binninger, Xi Cheng, Bae-Jung Kim, Julien Durst, Francesco Bozza, Thomas Graule, Robin Schäublin, Luke Wiles, Morgan Pertoso, Nemanja Danilovic, Katherine E Ayers, Thomas J Schmidt
The growing need to store increasing amounts of renewable energy has recently triggered substantial R&D efforts towards efficient and stable water electrolysis technologies. The oxygen evolution reaction (OER) occurring at the electrolyser anode is central to the development of a clean, reliable and emission-free hydrogen economy. The development of robust and highly active anode materials for OER is therefore a great challenge and has been the main focus of research. Among potential candidates, perovskites have emerged as promising OER electrocatalysts...
July 17, 2017: Nature Materials
Pengyan Wang, Zonghua Pu, Yanhui Li, Lin Wu, Zhengkai Tu, Min Jiang, Zongkui Kou, Ibrahim Saana Amiinu, Shichun Mu
Exploring efficient and earth-abundant electrocatalysts for water splitting is crucial for various renewable energy technologies. In this work, iron (Fe)-doped nickel phosphide (Ni2P) nanosheet arrays supported on nickel foam (Ni1.85Fe0.15P NSAs/NF) are fabricated through a facile hydrothermal method followed by phosphorization. The electrochemical analysis demonstrates that the Ni1.85Fe0.15P NSAs/NF electrode possesses high electrocatalytic activity for water splitting. In 1.0 M KOH, the Ni1.85Fe0.15P NSAs/NF electrode only needs overpotentials of 106 mV at 10 mA cm-2 and 270 mV at 20 mA cm-2 to drive hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively...
July 17, 2017: ACS Applied Materials & Interfaces
Coray L McBean, Haiqing Liu, Megan E Scofield, Luyao Li, Lei Wang, Ashley Bernstein, Stanislaus S Wong
The oxygen evolution reaction (OER) is a key reaction for water electrolysis cells and air-powered battery applications. However, conventional metal oxide catalysts, used for high-performing OER, tend to incorporate comparatively expensive and less abundant precious metals such as Ru and Ir, and, moreover, suffer from poor stability. To attempt to mitigate for all of these issues, we have prepared one-dimensional (1D) OER-active perovskite nanorods using a unique, simple, generalizable, and robust method. Significantly, our work demonstrates the feasibility of a novel electroless, seedless, surfactant-free, wet solution-based protocol for fabricating "high aspect ratio" LaNiO3 and LaMnO3 nanostructures...
July 17, 2017: ACS Applied Materials & Interfaces
Hao-Fan Wang, Cheng Tang, Bin Wang, Bo-Quan Li, Qiang Zhang
Bifunctional electrocatalysis for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) constitutes the bottleneck of various sustainable energy devices and systems like rechargeable metal-air batteries. Emerging catalyst materials are strongly requested toward superior electrocatalytic activities and practical applications. In this study, transition metal hydroxysulfides are presented as bifunctional OER/ORR electrocatalysts for Zn-air batteries. By simply immersing Co-based hydroxide precursor into solution with high-concentration S(2-) , transition metal hydroxides convert to hydroxysulfides with excellent morphology preservation at room temperature...
July 17, 2017: Advanced Materials
İkbal Agah İnce, Gorben P Piljman, Just M Vlak, Monique M van Oers
Previously, we observed that the transcripts of Invertebrate iridescent virus 6 (IIV6) are not polyadenylated, in line with the absence of canonical poly(A) motifs (AATAAA) downstream of the open reading frames (ORFs) in the genome. Here, we determined the 3' ends of the transcripts of fifty-four IIV6 virion protein genes in infected Drosophila Schneider 2 (S2) cells. By using ligation-based amplification of cDNA ends (LACE) it was shown that the IIV6 mRNAs often ended with a CAUUA motif. In silico analysis showed that the 3'-untranslated regions of IIV6 genes have the ability to form hairpin structures (22-56 nt in length) and that for about half of all IIV6 genes these 3' sequences contained complementary TAATG and CATTA motifs...
July 11, 2017: Virology
Xuping Sun
Searching for a simple and fast strategy to effectively enhance the oxygen evolution reaction (OER) performance of non-noble-metal electrocatalysts in alkaline media remains a significant challenge. Herein, we demonstrate that the OER activity of NiFe-LDH nanoarray on carbon cloth (NiFe-LDH/CC) in alkaline media is greatly boosted by amorphous NiFe-Borate (NiFe-Bi) layer formation on NiFe-layered double hydroxide (NiFe-LDH) surface. Such NiFe-LDH@NiFe-Bi/CC catalyst electrode only needs overpotential of 294 mV to drive 50 mA cm-2 in 1...
July 11, 2017: Chemistry: a European Journal
Nan Wang, Ligui Li, Dengke Zhao, Xiongwu Kang, Zhenghua Tang, Shaowei Chen
Nitrogen and sulfur-codoped graphene composites with Co9 S8 (NS/rGO-Co) are synthesized by facile thermal annealing of graphene oxides with cobalt nitrate and thiourea in an ammonium atmosphere. Significantly, in 0.1 m KOH aqueous solution the best sample exhibits an oxygen evolution reaction (OER) activity that is superior to that of benchmark RuO2 catalysts, an oxygen reduction reaction (ORR) activity that is comparable to that of commercial Pt/C, and an overpotential of only -0.193 V to reach 10 mA cm(-2) for hydrogen evolution reaction (HER)...
July 10, 2017: Small
Laura Gledhill, Vicki H M Dale, Sonya Powney, Gemma H L Gaitskell-Phillips, Nick R M Short
Today's veterinary students have access to a wide range of online resources that support self-directed learning. To develop a benchmark of current global student practice in e-learning, this study measured self-reported access to, and use of, these resources by students internationally. An online survey was designed and promoted via veterinary student mailing lists and international organizations, resulting in 1,070 responses. Analysis of survey data indicated that students now use online resources in a wide range of ways to support their learning...
July 10, 2017: Journal of Veterinary Medical Education
Gao Chen, Wei Zhou, Daqin Guan, Jaka Sunarso, Yanping Zhu, Xuefeng Hu, Wei Zhang, Zongping Shao
Perovskite oxides exhibit potential for use as electrocatalysts in the oxygen evolution reaction (OER). However, their low specific surface area is the main obstacle to realizing a high mass-specific activity that is required to be competitive against the state-of-the-art precious metal-based catalysts. We report the enhanced performance of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) for the OER with intrinsic activity that is significantly higher than that of the benchmark IrO2, and this result was achieved via fabrication of an amorphous BSCF nanofilm on a surface-oxidized nickel substrate by magnetron sputtering...
June 2017: Science Advances
Chunzhen Yang, Christel Laberty-Robert, Dmitry Batuk, Giannantonio Cibin, Alan V Chadwick, Vanessa Pereira Pimenta, Wei Yin, Leiting Zhang, Jean-Marie Tarascon, Alexis Grimaud
Recent findings revealed that surface oxygen can participate in the oxygen evolution reaction (OER) for the most active catalysts, which eventually triggers a new mechanism for which the deprotonation of surface intermediates limits the OER activity. We propose in this work a "dual strategy", for which tuning the electronic properties of the oxide such as La1-xSrxCoO3-δ can be dissociated from the use of surface functionalization with phosphate ion groups (Pi) that enhances the interfacial proton transfer...
July 7, 2017: Journal of Physical Chemistry Letters
Bo Ouyang, Yongqi Zhang, Zheng Zhang, Hong Jin Fan, Rajdeep Singh Rawat
Developing transition metal nitrides with unique nanomorphology is important for many energy storage and conversion processes. Here, a facile and novel one-step approach of growing 3D hierarchical nickel nitride (hNi3 N) on Ni foam via nitrogen plasma is reported. Different from most conventional chemical synthesis, the hNi3 N is obtained in much shorter growth duration (≤15 min) without any hazardous or reactive sources and oxide precursors at a moderate reaction zone temperature of ≤450 °C. Among possible multifunctionalities of the obtained nanocoral hNi3 N, herein the performance in reversible lithium ion storage and electrocatalytic oxygen evolution reaction (OER) is demonstrated...
July 6, 2017: Small
Matthias Driess, Chakadola Panda, Prashanth Wilfried Menezes, Carsten Walter, Shenglai Yao, Matthias Miehlich, Vitaly Gutkin, Karsten Meyer
A highly active FeSe2 electrocatalyst for durable overall water-splitting has been prepared from a molecular 2Fe-2Se precursor. The as-synthesized FeSe2 was electrophoretically deposited on nickel foam and applied for both oxygen (OER) and hydrogen evolution reaction (HER) in alkaline media. When used as an oxygen-evolution electrode, merely 245 mV of overpotential was achieved at a current density of 10 mAcm-2, representing outstanding catalytic activity and stability due to the formation of Fe(OH)2/FeOOH active sites at the surface of FeSe2...
July 5, 2017: Angewandte Chemie
Shuling Li, Jin Xu, Zhong Ma, Shiming Zhang, Xiufang Wen, Xuebin Yu, Jun Yang, Zi-Feng Ma, Xianxia Yuan
NiMn2O4 with different crystal structures was successfully synthesized and evaluated as a cathode catalyst for rechargeable Li-air batteries for the first time. The result reveals that the intermediate spinel structure between normal and inverse spinels demonstrates faster kinetics towards ORR/OER than the normal spinel, leading to a better battery performance.
July 18, 2017: Chemical Communications: Chem Comm
Jungang Hou, Yiqing Sun, Shuyan Cao, Yunzhen Wu, Hong Chen, Licheng Sun
Bifunctional electrocatalysts are highly desired for overall water splitting. Herein, the design and fabrication of three-dimensional (3D) hierarchical earth-abundant transition bimetallic phosphide arrays constructed by one-dimensional tubular array that was derived from assembling two-dimensional nanosheet framework has been reported by tailoring the Co/Ni ratio and tunable morphologies, and zero-dimensional (0D) graphene dots were embedded on Co-Ni phosphide matrix to construct 0D/2D tubular array as a highly efficient electrode in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER)...
July 14, 2017: ACS Applied Materials & Interfaces
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
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