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oxygen evolution

Xiao Wang, Le Yu, Bu Yuan Guan, Shuyan Song, Xiong Wen David Lou
Rational design of complex metal-organic framework (MOF) hybrid precursors offers a great opportunity to construct various functional nanostructures. Here, a novel MOF-hybrid-assisted strategy to synthesize Co3 O4 /Co-Fe oxide double-shelled nanoboxes is reported. In the first step, zeolitic imidazolate framework-67 (ZIF-67, a Co-based MOF)/Co-Fe Prussian blue analogue (PBA) yolk-shell nanocubes are formed via a facile anion-exchange reaction between ZIF-67 nanocube precursors and [Fe(CN)6 ]3- ions at room temperature...
May 21, 2018: Advanced Materials
Tanyuan Wang, Gyutae Nam, Yue Jin, Xingyu Wang, Pengju Ren, Min Gyu Kim, Jiashun Liang, Xiaodong Wen, Haeseong Jang, Jiantao Han, Yunhui Huang, Qing Li, Jaephil Cho
A facile H2 O2 oxidation treatment to tune the properties of metal disulfides for oxygen evolution reaction (OER) activity enhancement is introduced. With this method, the degree of oxidation can be readily controlled and the effect of surface S residues in the resulted metal (oxy)hydroxides for the OER is revealed for the first time. The developed NiFe (oxy)hydroxide catalyst with residual S demonstrates an extraordinarily low OER overpotential of 190 mV at the current density of 10 mA cm-2 after coupling with carbon nanotubes, and outstanding performance in Zn-air battery tests...
May 21, 2018: Advanced Materials
Hanwen Liu, Kui Hu, Dafeng Yan, Ru Chen, Yuqin Zou, Hongbo Liu, Shuangyin Wang
As a new type of 2D semiconductor, black phosphorus (BP) possesses high charge-carrier mobility and theoretical capacity, thickness-dependent bandgap, and anisotropic structure, which has attracted tremendous attention since early 2014. To explore its full application in all aspects, studies based on BP nanostructures are swiftly expanding from the electronic field to energy storage and even biochemistry. The mechanism and application of BP in Li-/Na-ion battery anodes, oxygen evolution reaction/hydrogen evolution reaction catalysis, photocatalytic hydrogen production, and selective sensors are summarized...
May 21, 2018: Advanced Materials
Stefanie Schlicht, Sandra Haschke, Vladimir Mikhailovskii, Alina Manshina, Julien Bachmann
Nanoporous iridium electrodes are prepared and electrochemically investigated towards the water oxidation (oxygen evolution) reaction. The preparation is based on 'anodic' aluminum oxide templates, which provide straight, cylindrical nanopores. Their walls are coated using atomic layer deposition (ALD) with a newly developed reaction which results in a metallic iridium layer. The ALD film growth is quantified by spectroscopic ellipsometry and X-ray reflectometry. The morphology and composition of the electrodes are characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction...
May 2018: ChemElectroChem
P Lettenmeier, J Majchel, L Wang, V A Saveleva, S Zafeiratos, E R Savinova, J-J Gallet, F Bournel, A S Gago, K A Friedrich
A stable and cost effective oxygen evolution reaction (OER) catalyst is crucial for the large-scale market penetration of proton exchange membrane (PEM) water electrolyzers. We show that the synthesis of iridium nanoparticles in either low purity ethanol or water, or in the absence of a surfactant, is detrimental to the electrocatalytic properties of the materials. Adding NaBH4 in excess improves the purity of the catalyst enhancing the OER activity up to 100 A gIr -1 at 1.51 V vs. RHE, the highest value reported so far for high purity Ir nanoparticles...
April 14, 2018: Chemical Science
Junyuan Xu, Junjie Li, Dehua Xiong, Bingsen Zhang, Yuefeng Liu, Kuang-Hsu Wu, Isilda Amorim, Wei Li, Lifeng Liu
Transition metal phosphides (TMPs) have recently emerged as a new class of pre-catalysts that can efficiently catalyze the oxygen evolution reaction (OER). However, how the OER activity of TMPs varies with the catalyst composition has not been systematically explored. Here, we report the alkaline OER electrolysis of a series of nanoparticulate phosphides containing different equimolar metal (M = Fe, Co, Ni) components. Notable trends in OER activity are observed, following the order of FeP < NiP < CoP < FeNiP < FeCoP < CoNiP < FeCoNiP, which indicate that the introduction of a secondary metal(s) to a mono-metallic TMP substantially boosts the OER performance...
April 14, 2018: Chemical Science
Zhichao Xu, Tianyi Xin, Dorothea Bartels, Ying Li, Wei Gu, Hui Yao, Sai Liu, Haoying Yu, Xiangdong Pu, Jianguo Zhou, Jiang Xu, Caicai Xi, Hetian Lei, Jingyuan Song, Shilin Chen
Resurrection plants, which are the "gifts" of natural evolution, are ideal models for studying genetic basis of plant desiccation tolerance. Here, we report a high-quality genome assembly of 301 Mb for the diploid spike moss Selaginella tamariscina, a primitive vascular resurrection plant. We predicated 27,761 protein-coding genes from the assembled S. tamariscina genome, 11.38% (2363) of which showed significant expression changes in response to desiccation. Approximately 60.58% of the S. tamariscina genome was annotated as repetitive DNA, which is almost 2-fold increase of that in the genome of desiccation-sensitive S...
May 16, 2018: Molecular Plant
Matthias Gilbert, Hanno Bährs, Christian E W Steinberg, Christian Wilhelm
Humic substances (HSs) can influence the growth and composition of freshwater phytoplankton assemblage. Since HSs contain many phenolic and quinonic moieties and cause growth reductions in eco-physiological field experiments, HSs are considered photosystem II herbicides. To test this specific mode of action in vivo and in vitro, respectively, we used intact cells of the green alga Desmodesmus armatus, as well as thylakoids isolated from spinach (Spinacia oleracea) as a model system for the green algal chloroplast...
May 18, 2018: Photosynthesis Research
Viktoriia A Saveleva, Li Wang, Detre Teschner, Travis E Jones, Aldo S Gago, K Andreas Friedrich, Spyridon Zafeiratos, Robert Schloegl, Elena R Savinova
Progress in the development of the proton exchange membrane (PEM) water electrolysis technology requires decreasing the anode overpotential, where the sluggish multistep oxygen evolution reaction (OER) occurs. This calls for the understanding of the nature of the active OER sites and reaction intermediates, which are still being debated. In this work, we apply synchrotron radiation - based near ambient pressure X-ray photoelectron and absorption spectroscopies under operando conditions in order to unveil the nature of the reaction intermediates and shed light on the OER mechanism on electrocatalysts most widely used in PEM electrolyzers - electrochemical and thermal iridium oxides...
May 18, 2018: Journal of Physical Chemistry Letters
Zongmin Zheng, Lele Lin, Shiguang Mo, Daohui Ou, Jing Tao, Ruixuan Qin, Xiaoliang Fang, Nanfeng Zheng
2D layered metal hydroxides (LMH) are promising materials for electrochemical energy conversion and storage. Compared with exfoliation of bulk layered materials, wet chemistry synthesis of 2D LMH materials under mild conditions still remains a big challenge. Here, an "MgO-mediated strategy" for mass production of various 2D LMH nanosheets is presented by hydrolyzing MgO in metal salt aqueous solutions at room temperature. Benefiting from this economical and scalable strategy, ultrathin LMH nanosheets (M = Ni, Fe, Co, NiFe, and NiCo) and their derivatives (e...
May 17, 2018: Small
Qingwen Zhou, Zihan Shen, Chao Zhu, Jiachen Li, Zhiyuan Ding, Peng Wang, Feng Pan, Zhiyong Zhang, Haixia Ma, Shuangyin Wang, Huigang Zhang
Hydrogen production is the key step for the future hydrogen economy. As a promising H2 production route, electrolysis of water suffers from high overpotentials and high energy consumption. This study proposes an N-doped CoP as the novel and effective electrocatalyst for hydrogen evolution reaction (HER) and constructs a coupled system for simultaneous hydrogen and sulfur production. Nitrogen doping lowers the d-band of CoP and weakens the H adsorption on the surface of CoP because of the strong electronegativity of nitrogen as compared to phosphorus...
May 17, 2018: Advanced Materials
Ming Tang, Monica Erdman, Graham Eldridge, Cin-Ty A Lee
The two most important magmatic differentiation series on Earth are the Fe-enriching tholeiitic series, which dominates the oceanic crust and island arcs, and the Fe-depleting calc-alkaline series, which dominates the continental crust and continental arcs. It is well known that calc-alkaline magmas are more oxidized when they erupt and are preferentially found in regions of thick crust, but why these quantities should be related remains unexplained. We use the redox-sensitive behavior of europium (Eu) in deep-seated, plagioclase-free arc cumulates to directly constrain the redox evolution of arc magmas at depth...
May 2018: Science Advances
Jesus D Fernandez-Bayo, Ramin Yazdani, Christopher W Simmons, Jean S VanderGheynst
The management of organic wastes is an environmental and social priority. Aerobic digestion (AED) or composting and anaerobic digestion (AD) are two organic waste management practices that produce a value-added final product. Few side-by-side comparisons of both technologies and their digestate products have been performed. The objective of this study was to compare the impact of initial feedstock properties (moisture content and/or C/N ratio) on stabilization rate by AED and AD and soil amendment characteristics of the final products...
May 14, 2018: Waste Management
Shuangyin Wang, Dawei Chen, Man Qiao, Yingrui Lu, L I Hao, Dongdong Liu, Chungli Dong, Yafei Li
Oxygen evolution reaction (OER) is an ideal model to study the relationship between the activity and the surface properties of catalysts. Defect engineering has been extensively developed to tune the electrocatalytic activity for OER. Compared to the anion vacancies in metal oxides, cation vacancies are more challenging to selectively generate, and the insight into the structure and activity of cation vacancies-rich catalysts are lacked. Herein, using SnCoFe perovskite hydroxide as precursors, we have preferentially produced abundant Sn vacancies on the surface by Ar plasma...
May 17, 2018: Angewandte Chemie
Swarnava Nandy, Takashi Hisatomi, Song Sun, Masao Katayama, Tsutomu Minegishi, Kazunari Domen
Oxysulfoselenide semiconductor photocatalysts absorb light at longer wavelengths than the corresponding oxysulfides. However, the synthesis of oxysulfoselenides is challenging due to excessive particle growth and the limited availability of metal selenide precursors. In this study, a La5 Ti2 CuS5 O7 (LTCSO) oxysulfide was annealed with Se powder in sealed, evacuated quartz tubes to obtain LTCSO:Se photocatalysts, and the properties of these materials were investigated. Se was found to be incorporated into the LTCSO upon heating at 973 K or higher, and the Se/(S + Se) ratio was increased to a maximum of 0...
May 17, 2018: ACS Applied Materials & Interfaces
Xiaoyu Ji, Shanshan Wang, Changwei Shao, Hao Wang
Amorphous SiBCN fibers possessing superior stability against oxidation have become a desirable candidate for the high-temperature aerospace applications. Currently, investigations on the high-temperature corrosion behavior of these fibers for the application in high-heat engines are insufficient. Here, our polymer-derived SiBCN fibers were corroded at 1400 °C in air and simulated combustion environments, respectively. The fibers' structural evolution after corrosion in two different conditions and the potential mechanisms are investigated...
May 16, 2018: ACS Applied Materials & Interfaces
Guodong Shi, Cong Yu, Zixiong Fan, Junbo Li, Mingjian Yuan
Graphdiyne (GDY), a novel two-dimensional full-carbon material, has attracted lots of attention because of its high conjugated system comprising sp2 and sp-hybridized carbons. The distinctive structure characteristics endow it unique electronic structure, uniform distributed pores and excellent chemical stability. A novel GDY-supported NiFe layered double hydroxide (LDH) composite was successfully prepared for the first time. By taking advantage of the increased surface active areas and improved conductivity, the designed hierarchical GDY@NiFe composite exhibits outstanding catalytic activity that only required a small overpotential about 260 mV to achieve the current density of 10 mA cm-2 ...
May 16, 2018: ACS Applied Materials & Interfaces
Shintaro Ida, Kenta Sato, Tetsuya Nagata, Hidehisa Hagiwara, Motonori Watanabe, Kim Namhoon, Yoshihito Shiota, Michio Koinuma, Sakae Takenaka, Elif Ertekin, Tatsumi Ishiihara
The hydrogen evolution reaction using semiconductor photocatalysts has been significantly improved by cocatalyst loading. However, there are still many speculations regarding the actual role of the cocatalyst. Here we report a photocatalytic hydrogen evolution reaction pathway on a cocatalyst site using TiO2 nanosheets doped with Rh at Ti sites as one-atom cocatalysts. A hydride species adsorbed on the one-atom Rh dopant cocatalyst site was confirmed experimentally as the intermediate state for hydrogen evolution, which was consistent with the results of density functional theory (DFT) calculations...
May 15, 2018: Angewandte Chemie
Yanzhou Wang, Panpan Gao, Xiaoxu Wang, Jinrong Huo, Lu Li, Yajing Zhang, Alex A Volinsky, Ping Qian, Yanjing Su
The pursuit of catalysts to promote effective water oxidization to produce oxygen has become a research subject of high priority for water splitting. Here, first-principles calculations are employed to study the water-splitting oxygen evolution reaction (OER) on ∼1.5 nm diameter Au13@Ni120P50 core-shell nanoclusters. Water splitting to produce oxygen proceeds in four intermediate reaction steps (OH*, O*, OOH* and O2). Adsorption configurations and adsorption energies for the species involved in OER on both Au13@Ni120P50 cluster and Ni12P5(001) supported by Au are presented...
May 16, 2018: Physical Chemistry Chemical Physics: PCCP
Dandan Zhao, Yecan Pi, Qi Shao, Yonggang Feng, Ying Zhang, Xiaoqing Huang
The development of electrocatalysts with high activity and stability for oxygen evolution reaction (OER) is critically important, the one being regarded as the bottleneck process of overall water splitting. Herein, we fulfill significant OER improvement in both activity and stability by constructing a class of Ni(OH)2 -CeO2 supported on carbon paper (Ni x Ce y @CP) with an intimate hydroxide (Ni(OH)2 )-oxide (CeO2 ) interface. Such interface largely promotes the OER activity with a low overpotential of 220 mV at 10 mA cm-2 and a small Tafel slope of 81...
May 17, 2018: ACS Nano
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