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Yuanjiao Pei, Ming Hu, Xueyong Tang, Wei Huang, Zelin Li, Shu Chen, Yue Xia
For fabrication of composite electrode, one-pot strategy is highly attractive for convenience and efficiency. Here, a self-supporting Co3 O4 /nanoporous gold (NPG) composite electrode was one-pot prepared via one-step in situ anodization of a smooth gold electrode in a CoCl2 solution within 100 s. It worked as a bifunctional electrocatalyst for glucose oxidation and H2 O2 reduction in NaOH solution. Under optimized conditions, the electrocatalytic oxidation of glucose exhibits a wide linear range from 2 μM to 2...
June 20, 2019: Analytica Chimica Acta
Xiaopeng Han, Wei Zhang, Xiaoya Ma, Cheng Zhong, Naiqin Zhao, Wenbin Hu, Yida Deng
Hybrid materials composed of transition-metal compounds and nitrogen-doped carbonaceous supports are promising electrocatalysts for various electrochemical energy conversion devices, whose activity enhancements can be attributed to the synergistic effect between metallic sites and N dopants. While the functionality of single-metal catalysts is relatively well-understood, the mechanism and synergy of bimetallic systems are less explored. Herein, the design and fabrication of an integrated flexible electrode based on NiCo2 S4 /graphitic carbon nitride/carbon nanotube (NiCo2 S4 @g-C3 N4 -CNT) are reported...
March 15, 2019: Advanced Materials
Qianyi Cui, Gangqiang Qin, Weihua Wang, Lixiang Sun, Aijun Du, Qiao Sun
The design of new, efficient catalysts for the conversion of CO2 to useful fuels under mild conditions is urgent in order to reduce greenhouse gas emissions and alleviate the energy crisis. In this work, a series of transition metals (TMs), including Sc to Zn, Mo, Ru, Rh, Pd and Ag, supported on a boron nitride (BN) monolayer with boron vacancies, were investigated as electrocatalysts for the CO2 reduction reaction (CRR) using comprehensive density functional theory (DFT) calculations. The results demonstrate that a single-Mo-atom-doped boron nitride (Mo-doped BN) monolayer possesses excellent performance for converting CO2 to CH4 with a relatively low limiting potential of -0...
2019: Beilstein Journal of Nanotechnology
Umar Farooq, Ruby Phul, Saad M Alshehri, Jahangeer Ahmed, Tokeer Ahmad
Development of cost effective and efficient electrocatalysts is crucial to generate H2 as an alternative source of energy. However, expensive noble metal based electrocatalysts show best electrocatalytic performances which acts as main bottle-neck for commercial application. Therefore, non-precious electrocatalysts have become important for hydrogen and oxygen evolution reactions. Herein, we report the synthesis of high surface area (35 m2 /g) sodium niobate nanoparticles by citrate precursor method. These nanoparticles were characterized by different techniques like X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy...
March 14, 2019: Scientific Reports
Pengzuo Chen, Nan Zhang, Sibo Wang, Tianpei Zhou, Yun Tong, Chengcheng Ao, Wensheng Yan, Lidong Zhang, Wangsheng Chu, Changzheng Wu, Yi Xie
Electrocatalytic N2 reduction reaction (NRR) into ammonia (NH3 ), especially if driven by renewable energy, represents a potentially clean and sustainable strategy for replacing traditional Haber-Bosch process and dealing with climate change effect. However, electrocatalytic NRR process under ambient conditions often suffers from low Faradaic efficiency and high overpotential. Developing newly regulative methods for highly efficient NRR electrocatalysts is of great significance for NH3 synthesis. Here, we propose an interfacial engineering strategy for designing a class of strongly coupled hybrid materials as highly active electrocatalysts for catalytic N2 fixation...
March 14, 2019: Proceedings of the National Academy of Sciences of the United States of America
Munaiah Yeddala, Demudu Babu Gorle, M Anbu Kulandainathan, P Ragupathy, Vijayamohanan K Pillai
We demonstrate a simple, single-step and scalable synthesis of edge-nitrogenated graphene nanosheets (E-N-GNS) through thermal exfoliation of graphite platelet nanofibers (GPNF) in the presence of melamine. This material was characterized using different physical characterization techniques which divulges that, the edges are selectively functionalised with pyridinic and pyrrolic type nitrogens leading to the formation of E-N-GNS. Further, the electrocatalytic activity of E-N-GNS towards oxygen reduction reaction (ORR) in alkaline medium was studied using electrochemical techniques to reveal superior electrocatalytic activity of E-N-GNS towards ORR than that of GPNF, perhaps due to the incorporation of N at the edges...
March 1, 2019: Journal of Colloid and Interface Science
Jee-Yee Chen, Suh-Ciuan Lim, Chun-Hong Kuo, Hsing-Yu Tuan
Sub-1 nm PtSn nanosheets of 0.6-0.9 nm in thickness were synthesized via a solution colloidal method and were applied as electrooxidation catalysts for methanol oxidation reaction (MOR) and ethanol oxidation (EOR) in alkaline and acid environments. Owing to the specific structural and compositional characteristics, the as-prepared PtSn nanosheets exhibits superior activity and durability relative to commercial Pt black and Pt/carbon catalysts. PtSn nanosheets not only exhibit an outstanding mass activity in MOR (871...
March 5, 2019: Journal of Colloid and Interface Science
Yongfei Wang, Hong Guo, Xudong Luo, Xin Liu, Zhizhi Hu, Lu Han, Zhiqiang Zhang
In this work, the progress in the design of nonsiliceous mesoporous materials (nonSiMPMs) over the last five years from the perspectives of the chemical composition, morphology, loading, and surface modification is summarized. Carbon, metal, and metal oxide are in focus, which are the most promising compositions. Then, representative applications of nonSiMPMs are demonstrated in energy conversion and storage, including recent technical advances in dye-sensitized solar cells, perovskite solar cells, photocatalysts, electrocatalysts, fuel cells, storage batteries, supercapacitors, and hydrogen storage systems...
March 14, 2019: Small
Yu Wang, Li Liu, Yanwei Wang, Ling Fang, Fu Wan, Huijuan Zhang
Herein, we fabricated two groups of component-tunable sandwich-like CoTe2xSe2(1-x) and CoS2ySe2(1-y) graphitized carbon-based composites. Due to the synergistic effect between the sandwich-like structures and anion-doping, CoTe2xSe2(1-x) and CoS2ySe2(1-y) demonstrated attractive catalytic performance towards the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. After optimizing the composition, we found that sandwich-like Co(Te0.33Se0.67)2 possesses optimal OER properties, with a low Tafel slope (44 mV dec-1), a small η10 (272 mV) and eminent stability for 50 h; meanwhile, the Co(S0...
March 14, 2019: Nanoscale
Zhengmao Cao, Zhongwei Jiang, Yang Li, Chengzhi Huang, Yuan Fang Li
Exploring efficient and durable catalysts from earth-abundant and cost-effective material is highly desirable for the sluggish anodic oxygen evolution reaction (OER). Here, a series of multinary metal organic gels (MOGs) with various and alterable metal element compositions are prepared via straightforwardly mixing metal ions and ligand (4, 4', 4''-((1, 3, 5-triazine-2, 4, 6-triyl) tris (azanediyl)) tribenzoic acid, H3TATAB) solution at room temperature. Then, the derived spinel-type metal oxides with excellent electrocatalytic OER performance are obtained through calcining treatment of as-synthesized MOGs...
March 13, 2019: ChemSusChem
Xuerong Zheng, Xiaopeng Han, Yiqi Zhang, Jihui Wang, Cheng Zhong, Yida Deng, Wenbin Hu
The exploitation of economical and highly efficient bifunctional electrocatalysts to promote oxygen evolution and hydrogen evolution reactions (OER and HER) for water splitting devices is urgently needed. Herein, a series of NiSx (i.e., NiS, Ni3S2, NiS2) nanocrystals with controllable phase and composition have been synthesized via a facile polyol solution process and the corresponding electrocatalytic properties towards OER and HER have been systematically investigated. Electrochemical results reveal that Ni3S2 exhibits superior OER and HER performance to NiS and NiS2, achieving 1...
March 13, 2019: Nanoscale
Chaofang Deng, Rongxing He, Wei Shen, Ming Li, Tao Zhang
Single-atom catalysts present extraordinary catalytic performance towards various reactions. In this work, the possibility of single Co atoms supported by the experimentally available defective two-dimensional boron nitride material (2D-BN) with boron vacancies (Co/BN) as a potential catalyst for the oxygen reduction reaction (ORR) was investigated by density functional theory. Co/BN has a similar active center to the cobalt nitride species, which have been proved to be effective ORR catalysts. It is found that Co atoms bind with the defective 2D-BN strongly to ensure the stability of Co/BN...
March 13, 2019: Physical Chemistry Chemical Physics: PCCP
Qixing Zhou, Zhangbin Su, Yidan Tang, Li Ai, Gengtao Fu, Zexing Wu, Dongmei Sun, Yawen Tang
Development of effective and affordable electrocatalysts for the oxygen reduction reaction (ORR) is critical for the renewable-energy technologies. Here we present a novel manganese iron oxide (MnFeO2) as a cost-effective material for the ORR with Pt-like electrochemical properties. Pyrolysis of hybrid agar-hydrogel on NaCl nanocrystals furnishes a unique structure in which the active MnFeO2 particles are uniformly immobilized in the nitrogen-doped porous carbon aerogels (designed as MnFeO2/NPC). Nitrogen-doped carbon is introduced to construct porous mass transfer channels and reduce self-aggregation of MnFeO2 particles...
March 12, 2019: Chemistry: a European Journal
Valeri Petkov, Yazan Maswadeh, Jorge A Vargas, Shiyao Shan, Haval Kareem, Zhi-Peng Wu, Jin Luo, Chuan-Jian Zhong, Sarvjit Shastri, Peter Kenesei
Catalysts for energy related applications, in particular metallic nanoalloys, readily undergo atomic-level changes during electrochemical reactions. The origin, dynamics and implications of the changes for the catalysts' activity inside fuel cells though are not well understood. This is largely because they are studied on model nanoalloy structures under controlled laboratory conditions. Here we use combined synchrotron X-ray spectroscopy and total scattering to study the dynamic behaviour of nanoalloys of Pt with 3d-transition metals as they function at the cathode of an operating proton exchange membrane fuel cell...
March 12, 2019: Nanoscale
Pengfei Song, Li Kang, Hao Wang, Rong Guo, Rong-Min Wang
The electrocatalytic conversion of nitrogen gas at ambient conditions represents a novel approach for ammonia synthesis to the sustainable society. It is critical to understand the detail pathways and mechanism of this promising process to develop highly efficient catalyst. Herein, N, P co-doping carbon (NP-C-MOF-5) catalyst was prepared for electrocatlytic N2 reduction in acid electrolyte under ambient temperature and pressure. Experimental results showed there are two products including NH3 and N2H4•H2O on NP-C-MOF-5 cathode at -0...
March 12, 2019: ACS Applied Materials & Interfaces
S Ramakrishnan, Mohanraju Karuppannan, Mohanraj Vinothkannan, K Ramachandran, Oh Joong Kwon, Dong Jin Yoo
Direct alcohol fuel cells (DAFCs) play a pivotal role in synthesis of catalysts due to their low cost, high catalytic activity, and long durability in half-cell reactions, which include anode (alcohol oxidation) and cathode (oxygen reduction) reactions. However, platinum catalysts suffer from CO tolerance, which affects their stability. The present study focuses on ultrafine Pt nanoparticles stabilized by flower-like MoS2/N-doped reduced graphene oxide (Pt@MoS2/NrGO) architecture was developed, via a facile and cost-competitive approach that performed through hydrothermal followed by wet-reflux strategy...
March 8, 2019: ACS Applied Materials & Interfaces
Jiawei Zhu, Zitao Chen, Minghao Xie, Zhiheng Lyu, Miaofang Chi, Manos Mavrikakis, Wanqin Jin, Younan Xia
We report a highly active and durable water oxidation electrocatalyst based on cubic nanocages with a composition of Ir44Pd10, together with well-defined {100} facets and porous walls of roughly 1.1 nm in thickness. Such nanocages substantially outperform all the water oxidation electrocatalysts reported in literature, with an overpotential of only 226 mV for reaching 10 mA•cm-2geo at a loading of Ir as low as 12.5 μgIr•cm-2 on the electrode in acidic media. When benchmarked against a commercial Ir/C electrocatalyst at 250 mV of overpotential, such a nanocage-based catalyst not only shows enhancements (18...
March 8, 2019: Angewandte Chemie
Zemin Sun, Mengwei Yuan, Han Yang, Liu Lin, Heyun Jiang, Shengsong Ge, Huifeng Li, Genban Sun, Shulan Ma, Xiaojing Yang
The development of novel and highly efficient bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is an ongoing challenge. The Cr3+ cation has a special electronic configuration (t3 2g e0 g ), which facilitates charge transfer and electron capture. However, Cr-based materials applied on water-splitting electrocatalysis is still a research void up to now. Herein, a novel amorphous γ-CrOOH was developed as a bifunctional electrocatalyst toward overall water splitting for the first time...
March 7, 2019: Inorganic Chemistry
Liang Su, Xiangzhi Cui, Ting He, Liming Zeng, Han Tian, Yiling Song, Kai Qi, Bao Yu Xia
Transition metal phosphides exhibit promising catalytic performance for the hydrogen evolution reaction (HER); however their surface structure evolution during electrochemical operation has rarely been studied. In this work, we investigate the surface reconstruction of CoP nanosheets by an in situ electrochemical activation method. After remodeling, CoP nanosheets experience an irreversible and significant evolution of the morphology and composition, and low-valence Co complexes consisting of Co(OH) x species are formed on the surface of CoP nanosheets, and they largely accelerate the dissociation of water...
February 21, 2019: Chemical Science
Haoran Wu, Jinliang Song, Chao Xie, Yue Hu, Pei Zhang, Guanying Yang, Buxing Han
Development of mild and efficient strategies for biomass conversion is of great significance, and design of advanced catalysts is crucial for biomass valorization. Herein, we designed PbS-based electrocatalysts through a surface engineering strategy via partial oxidation, and the degree of surface oxidation of PbS to PbSO4 could be easily tuned by calcination temperature. It was discovered that the prepared electrocatalysts could efficiently catalyze reduction of biomass-derived levulinic acid (LA) to γ-valerolactone (GVL) using water as the hydrogen source...
February 14, 2019: Chemical Science
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