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Lan Hui, Yurui Xue, Bolong Huang, Huidi Yu, Chao Zhang, Danyan Zhang, Dianzeng Jia, Yingjie Zhao, Yongjun Li, Huibiao Liu, Yuliang Li
It is of great urgency to develop efficient, cost-effective, stable and industrially applicable electrocatalysts for renewable energy systems. But there are still few candidate materials. Here we show a bifunctional electrocatalyst, comprising graphdiyne-exfoliated and -sandwiched iron/cobalt layered double-hydroxide nanosheet arrays grown on nickel foam, for the oxygen and hydrogen evolution reactions. Theoretical and experimental data revealed that the charge transport kinetics of the structure were superior to iron/cobalt layered double-hydroxide, a prerequisite for improved electrocatalytic performance...
December 14, 2018: Nature Communications
Yanmei Shi, Yu Yu, Yu Liang, Yonghua Du, Bin Zhang
Oxygen evolution reaction (OER) is an important half reaction in many energy conversion and storage techniques. However, the development of a low-cost easy-prepared OER electrocatalyst with high mass activity and rapid kinetics is still challenging. Here, we report the facile deposition of tannin-NiFe (TANF) complex film on carbon fiber paper (CP) as a highly efficient OER electrocatalyst. TANF performs rapid OER reaction kinetics with a very small Tafel slope of 28 mV dec-1. And the mass activity of TANF reaches as high as 9...
December 14, 2018: Angewandte Chemie
Javeed Mahmood, Mohsin Ali Raza Anjum, Jong-Beom Baek
Fused aromatic network (FAN) structures are a category of ordered porous polymers that permit the specific fusion of building blocks into extended porous network structures with designed skeletons and pores. One significant feature of FANs is that their structures can be tailorable with fused aromatic rings without rotatable single-bond connectivity. As a result, the geometry and space orientation of the building blocks are easily incorporated to guide the topological expansion of the architectural periodicity...
December 14, 2018: Advanced Materials
Chungseok Choi, Tao Cheng, Michelle Flores Espinosa, Huilong Fei, Xiangfeng Duan, William A Goddard, Yu Huang
The electrochemical carbon dioxide reduction reaction (CO2 RR) presents a viable approach to recycle CO2 gas into low carbon fuels. Thus, the development of highly active catalysts at low overpotential is desired for this reaction. Herein, a high-yield synthesis of unique star decahedron Cu nanoparticles (SD-Cu NPs) electrocatalysts, displaying twin boundaries (TBs) and multiple stacking faults, which lead to low overpotentials for methane (CH4 ) and high efficiency for ethylene (C2 H4 ) production, is reported...
December 14, 2018: Advanced Materials
Lili Han, Xijun Liu, Jinping Chen, Ruoqian Lin, Haoxuan Liu, Fang Lu, Seongmin Bak, Zhixiu Liang, Shunzheng Zhao, Eli Stavitski, Jun Luo, Radoslav R Adzic, Huolin Xin
NH3 synthesis by electrocatalytic N2 reduction reaction (NRR) under ambient conditions is an appealing alternative to the industrial method that requires high temperature and pressure. Herein, we report single Mo atoms anchored to N-doped porous carbon, which works as a cost-effective catalyst for NRR. Benefiting from the optimally high density of active sites and hierarchically porous carbon frameworks, this catalyst achieves a high NH3 yield rate (34.0 ± 3.6 μgNH3 h-1 mgcat.-1) and a high Faradaic efficiency (14...
December 12, 2018: Angewandte Chemie
Jieting Ding, Shan Ji, Hui Wang, Dan J L Brett, Bruno G Pollet, Rongfang Wang
The development of alternative electrocatalysts exhibiting high oxygen reduction reaction (ORR) activity is vital for the deployment of large-scale clean energy devices, such as fuel cells and Zn-air batteries. N-doped carbon materials offer a promising platform for the design and synthesis of electrocatalysts due to their high ORR activity, high surface area and tuneable porosity. In this study, MnO nanoparticles entrapped N-doped mesoporous carbon compounds (MnO/NC) were developed as electrocatalysts for ORR, and their performances were evaluated in operational zinc-air batteries...
December 12, 2018: Chemistry: a European Journal
Zuozhong Liang, Xing Fan, Haitao Lei, Jing Qi, Youyong Li, Jinpeng Gao, Meiling Huo, Haitao Yuan, Wei Zhang, Haiping Lin, Haoquan Zheng, Rui Cao
No abstract text is available yet for this article.
December 17, 2018: Angewandte Chemie
Young Jin Sa, Jae Hyung Kim, Sang Hoon Joo
Electrochemical hydrogen peroxide production enables clean and on-site production of H2O2, for which highly active and selective electrocatalysts are of crucial importance. Here, we report a highly efficient, metal-free carbon nanocatalyst that possesses abundant active, oxygenated graphitic edge sites. The edge site-rich nanocarbon catalyst exhibits ~22 times higher activity for H2O2 production than a basal plane-rich carbon nanotube with a H2O2 selectivity over 90%. The oxidative treatment further promotes the H2O2 generation activity to reach close to the thermodynamic limit...
December 10, 2018: Angewandte Chemie
Subhajit Bhunia, Kousik Bhunia, Bidhan Chandra Patra, Sabuj Kanti Das, Debabrata Pradhan, Asim Bhaumik, Anirban Pradhan, Santanu Bhattacharya
Oxygen evolution reaction (OER) is energetically challenging from the platform of making many photovoltaic devices such as metal-Air battery and water splitting systems, because of its poor kinetics even when precious metals are used. Herein a Co (II)-porphyrin/pyrene comprised conjugated microporous polymer Co-MPPy-1 has been developed which shows efficient oxygen evolution reaction in alkaline medium. The material was characterized by FT-IR, solid-state 13C CP-MAS NMR, N2 volumetric adsorption/desorption analysis, SEM, UHR-TEM, XPS, and other physical studies...
December 14, 2018: ACS Applied Materials & Interfaces
Juntao Zhang, Min Li, Xin Liang, Zhongbin Zhuang
Active non-precious metal based hydrogen evolution reaction (HER) electrocatalyst is critical for the clean and sustainable generation of hydrogen. Here we synthesized multi-shelled FeCo@FeCoP@C hollowspheres by the carbonization and phosphorization of the FeCo-MIL-88 metal organic framework. Owing to the both composition (FeCo mixed phosphide) and morphology (multi-shelled morphology) effect, the as-obtained FeCo@FeCoP@C exhibits excellent HER performance with low overpotential of 65 mV to achieve HER current density of 10 mA cm-2 and high stability in acidic solution...
December 14, 2018: ACS Applied Materials & Interfaces
Zhihua Zhuang, Wei Chen
How to reduce the usage of precious metals in electrocatalysts is a big challenge for the development of fuel cells. Metal nanoclusters (NCs) are highly desirable as active catalysts, but palladium nanoclusters (Pd NCs) have been less well developed than other metal clusters, such as gold, silver and copper, owing partly to the difficulties in size-controlled synthesis. Here, based on N, N-dimethylformamide (DMF)-mediation and ligand-exchange reaction, atomically precise Pd5 (C12 H25 S)13 nanoclusters are successfully synthesized...
December 4, 2018: Journal of Colloid and Interface Science
John Mark P Martirez, Emily A Carter
The active site for electrocatalytic water oxidation on the highly active Fe-doped β-nickel oxyhydroxide (β-NiOOH) electrocatalyst is still hotly debated. Here we characterize the oxygen evolution reaction (OER) activity of an unexplored facet of this material with first-principles quantum mechanics. We show that molecular-like four-fold-lattice-oxygen-coordinated metal sites on the (1 ̅21 ̅1) surface may very well be the key active sites in the electrocatalysis. The predicted OER overpotential (η_OER) for a Fe-centered pathway is reduced by 0...
December 13, 2018: Journal of the American Chemical Society
Jun Zhao, Yu He, Zelin Chen, Xuerong Zheng, Xiaopeng Han, Dewei Rao, Cheng Zhong, Wenbin Hu, Yida Deng
Clarifying and controlling the surface catalytic active sites is at the heart of developing low-cost effective bifunctional oxygen catalysts to replace precious metals for metal-air batteries. Herein, a shape-control of hexagon nickel cobalt oxide spinel nanosheets was reported to engineer the surface metal active sites for enhanced electrocatalysis of oxygen evolution and oxygen reduction reactions (OER/ORR). Specifically, through simply tuning annealing temperature, different Ni3+/Ni2+ and Co3+/Co2+ atomic configurations on nickel cobalt oxide surface were controllably synthesized...
December 11, 2018: ACS Applied Materials & Interfaces
Do Hyung Kweon, Jong-Beom Baek
A scalable and low-cost production of graphene nanoplatelets (GnPs) is one of the most important challenges for their commercialization. A simple mechanochemical reaction has been developed and applied to prepare various edge-functionalized GnPs (EFGnPs). EFGnPs can be produced in a simple and ecofriendly manner by ball milling of graphite with target substances (X = nonmetals, halogens, semimetals, or metalloids). The unique feature of this method is its use of kinetic energy, which can generate active carbon species by unzipping of graphitic CC bonds in dry conditions (no solvent)...
December 9, 2018: Advanced Materials
Binwei Zhang, Tian Sheng, Yunxiao Wang, Shulei Chou, Kenneth Davey, Shi-Xue Dou, Shizhang Qiao
Room-temperature sodium-sulfur (RT-Na/S) batteries hold significant promise for large-scale application because of low cost of both sodium and sulfur. However, the dissolution of polysulfides into the electrolyte limits practical application. Here, we report the design and testing of a new class of sulfur hosts as transition metal (Fe, Cu, and Ni) nanoclusters (~ 1.2 nm) wreathed on hollow carbon nanospheres (S@M-HC) for RT-Na/S batteries. A chemical couple between the metal nanoclusters and sulfur is hypothesized to assist in immobilization of sulfur and to enhance conductivity and activity...
December 9, 2018: Angewandte Chemie
Dekun Wu, Qing Xu, Jing Qian, Xiaopeng Li, Yuhan Sun
Covalent organic frameworks (COFs) are a new class of crystalline porous polymers, which comprise mainly of carbons and are versatile for integrating heteroatoms such as B, O and N to the skeletons. The designable structure and abundant composition render COFs useful as precursors for heteroatom-doped porous carbons for energy storage and conversion. Herein, we describe a multifunctional electrochemical catalyst by pyrolysis of a bimetallic COF. The catalyst possesses hierarchical pores and abundant iron and cobalt nanoparticles embedded with standing carbon layers...
December 11, 2018: Chemistry: a European Journal
Guihua Liu, Jingde Li, Jing Fu, Gaopeng Jiang, Gregory Lui, Dan Luo, Ya-Ping Deng, Jing Zhang, Zachary P Cano, Aiping Yu, Dong Su, Zhengyu Bai, Lin Yang, Zhongwei Chen
The highly oxidative operating conditions of rechargeable zinc-air batteries causes significant carbon-support corrosion of bifunctional oxygen electrocatalysts. Here, a new strategy for the catalyst support design focusing on oxygen vacancy (OV)-rich, low-bandgap semiconductor is proposed. The OVs promote the electrical conductivity of the oxide support, and at the same time offer a strong metal-support interaction (SMSI), which enables the catalysts to have small metal size, high catalytic activity, and high stability...
December 9, 2018: Advanced Materials
Bin Cai, Alexander Eychmüller
Electrocatalysis plays a prominent role in renewable energy conversion and storage, enabling a number of sustainable processes for future technologies. There are generally three strategies to improve the efficiency (or activity) of the electrocatalysts: i) increasing the intrinsic activity of the catalyst itself, ii) improving the exposure of active sites, and iii) accelerating mass transfer during catalysis (both reactants and products). These strategies are not mutually exclusive and can ideally be addressed simultaneously, leading to the largest improvements in activity...
December 9, 2018: Advanced Materials
Lipeng Zhang, Chun-Yu Lin, Detao Zhang, Lele Gong, Yonghao Zhu, Zhenghang Zhao, Quan Xu, Hejun Li, Zhenhai Xia
Carbon nanomaterials are promising metal-free catalysts for energy conversion and storage, but the catalysts are usually developed via traditional trial-and-error methods. To rationally design and accelerate the search for the highly efficient catalysts, it is necessary to establish design principles for the carbon-based catalysts. Here, theoretical analysis and material design of metal-free carbon nanomaterials as efficient photo-/electrocatalysts to facilitate the critical chemical reactions in clean and sustainable energy technologies are reviewed...
December 7, 2018: Advanced Materials
Lan Yang, Guangtao Yu, Xuan Ai, Wensheng Yan, Hengli Duan, Wei Chen, Xiaotian Li, Ting Wang, Chenghui Zhang, Xuri Huang, Jie-Sheng Chen, Xiaoxin Zou
The widespread use of proton exchange membrane water electrolysis requires the development of more efficient electrocatalysts containing reduced amounts of expensive iridium for the oxygen evolution reaction (OER). Here we present the identification of 6H-phase SrIrO3 perovskite (6H-SrIrO3 ) as a highly active electrocatalyst with good structural and catalytic stability for OER in acid. 6H-SrIrO3 contains 27.1 wt% less iridium than IrO2 , but its iridium mass activity is about 7 times higher than IrO2 , a benchmark electrocatalyst for the acidic OER...
December 7, 2018: Nature Communications
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