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Lei Wang, Tianjiao Meng, Guangshun Yu, Shasha Wu, Jingjing Sun, Huixian Jia, Huan Wang, Xinjian Yang, Yufan Zhang
An electrochemical biosensor was designed for the determination of telomerase activity using an enzyme-free, PCR-free, and convenient electrochemical strategy. In this work, the electrochemical biosensor was constructed through the functionalization of Au nanorods with a carboxylic group (AuNRs-3) and subsequent immobilization with capture DNA (cDNA) for sensing telomerase activity. Upon telomerase triggered extension, the telomerase activity is related to the amount of the adsorbed electrocatalyst, leading to the different electrochemical signals for readout...
October 9, 2018: Biosensors & Bioelectronics
Xijun Liu, Jia He, Shunzheng Zhao, Yunpeng Liu, Zhe Zhao, Jun Luo, Guangzhi Hu, Xiaoming Sun, Yi Ding
Splitting hydrazine into H2 and N2 by electro-catalyzing hydrogen evolution and hydrazine oxidation reactions is promising for replacing fossil energy with H2 . However, current hydrazine splitting is achieved using external powers to drive the two reactions, which is inapplicable to outdoor use. Here, Fe-doped CoS2 nanosheets are developed as a bifunctional electrocatalyst for the two reactions, by which direct hydrazine fuel cells and overall-hydrazine-splitting units are realized and integrated to form a self-powered H2 production system...
October 19, 2018: Nature Communications
Zheng-Hong Huang, Nan-Hong Xie, Min Zhang, Bo-Qing Xu
Pyrolyzed base-metal based metal-organic frameworks (MOFs) with FeNX coordinations are emerging as non-precious metal catalysts for electrochemical oxygen reduction reaction (ORR). However, it is surprising that non-pyrolyzed MOFs involving Fe-N coordinations have not yet been explored in that perspective. We report herein the catalytic performance of a semiconducting non-pyrolyzed iron triazolate framework (FeTa2) for ORR in alkaline electrolyte. This FeTa2 catalyst is studied as composites with different amounts of conductive Ketjenblack carbon (KB)...
October 19, 2018: ChemSusChem
Binbin Jiang, Tao Wang, Yafei Cheng, Fan Liao, Konglin Wu, Mingwang Shao
Nitrogen doped graphene (NG) chemically coupled with graphitic carbon nitride (g-C3N4) may facilitate the kinetics of overall electrochemical water splitting. Herein, a facile strategy is adopted to synthesize monodispersed Ir nanoparticles on g-C3N4/NG layers. Benefiting from the synergistic effect between different components of the catalyst, the optimal Ir/g-C3N4/NG catalyst with low content of Ir, (5.9 wt%) exhibits highly active for electrochemical water splitting in acidic electrolyte. Specifically, as a HER catalyst, the optimal Ir/g-C3N4/NG exhibits Tafel slope of 22 mV•dec-1...
October 19, 2018: ACS Applied Materials & Interfaces
Xiao Zhao, Shinobu Takao, Takuma Kaneko, Yasuhiro Iwasawa
It remains a big challenge to remarkably improve both oxygen reduction reaction (ORR) activity and long-term durability of Pt-M bimetal electrocatalysts simultaneously in the harsh cathode environment toward widespread commercialization of polymer electrolyte fuel cells (PEFC). In this account we found double-promotional effects of carbon micro coil (CMC) support on ORR performance and durability of octahedral Pt3 Ni nanoparticles (Oh Pt3 Ni/CMC). The Oh Pt3 Ni/CMC displayed remarkable improvements of mass activity (MA; 13...
October 19, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Hsin-Ya Kuo, Tia S Lee, An T Chu, Steven E Tignor, Gregory D Scholes, Andrew B Bocarsly
Manganese(i) tricarbonyl complexes such as [Mn(bpy)(CO)3L] (L = Br, or CN) are known to be electrocatalysts for CO2 reduction to CO. However, due to their rapid photodegradation under UV and visible light, these monomeric manganese complexes have not been considered as photocatalysts for CO2 reduction without the use of a photosensitizer. In this paper, we report a cyanide-bridged di-manganese complex, {[Mn(bpy)(CO)3]2(μ-CN)}ClO4, which is both electrocatalytic and photochemically active for CO2 reduction to CO...
October 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Xing Song, Shuiping Luo, Xiaokun Fan, Min Tang, Xixia Zhao, Wen Chen, Qi Yang, Zewei Quan
Well-defined PtNi nanocrystals represent one of the most efficient electrocatalysts to boost the oxygen reduction reaction (ORR), especially in the shape of octahedrons, nanoframes, and nanowires. However, the synthesis of complex PtNi nanostructure is still a great challenge. Herein, we report a new class of PtNi hexapods with high activity and stability toward ORR. The hexapods are prepared by selective capping and simultaneous corrosion. By controlling the oxidative etching, PtNi polyhedrons and nanoparticles are obtained, respectively...
2018: Frontiers in Chemistry
Rosa M Arán-Ais, Dunfeng Gao, Beatriz Roldan Cuenya
The utilization of fossil fuels (i.e., coal, petroleum, and natural gas) as the main energy source gives rise to serious environmental issues, including global warming caused by the continuously increasing level of atmospheric CO2 . To deal with this challenge, fossil fuels are being partially replaced by renewable energy such as solar and wind. However, such energy sources are usually intermittent and currently constitute a very low portion of the overall energy consumption. Recently, the electrochemical conversion of CO2 to chemicals and fuels with high energy density driven by electricity derived from renewable energy has been recognized as a promising strategy toward sustainable energy...
October 18, 2018: Accounts of Chemical Research
Guoqiang Li, Kai Li, Long Yang, Jinfa Chang, Rongpeng Ma, Zhijian Wu, Junjie Ge, Changpeng Liu, Wei Xing
Reducing the noble-metal loading without sacrificing catalytic performance of the oxygen evolution reaction (OER) catalysts is paramount yet highly challenging. Herein, IrO2@Ir/TiN electrocatalysts employing TiN as the support have been developed and shown highly-efficient towards OER. TiN is found not only dispersing the IrO2@Ir nanoparticles effectively, but also exerting electronic modulation to Ir by downshifting its d-band center of 0.21 eV compared to pure IrO2. Excitingly, TiN remarkably enhances the catalytic performance of Ir, where the overpotential to achieve current density of 10 mA cm-2 is only 265 mV for the IrO2@Ir/TiN (60 wt%) catalyst...
October 18, 2018: ACS Applied Materials & Interfaces
Shuo Geng, Hu Liu, Weiwei Yang, Yongsheng Yu
Molybdenum disulfide (MoS2) has drawn persistent interests as one of the promising alternatives non-precious electrocatalyst to Pt for hydrogen evolution reaction (HER). However, the MoS2 catalytic efficiency is still lower than the Pt-based catalysts owing to insufficient active sites with inert more basal planes. Herein, we designed and synthesized the porous MoS2 nanosheets to activate the basal planes by etching away Al in Al-doped MoS2. And the optimized porous MoS2 shows a small onset overpotential as low as 136 mV, a large cathode current density of 10 mA/cm2 at η = 201 mV, a low Tafel slope of 62 mV decade-1, and high TOF of 0...
October 18, 2018: Chemistry: a European Journal
Xiufeng Wu, Li Xia, Yuan Wang, Wenbo Lu, Qian Liu, Xifeng Shi, Xuping Sun
Traditionally, ammonia (NH3 ) is synthesized via the Haber-Bosch process, which is not only commanded by harsh conditions but causes serious environmental pollution. Electrochemical reduction is recognized as a mild and environmentally benign alternative approach for NH3 synthesis, but an efficient electrocatalyst is a prerequisite for NH3 production. In this communication, the first experimental demonstration that Mn3 O4 nanocubes can be used as an efficient non-noble-metal electrocatalyst for N2 reduction reaction (NRR) at ambient conditions is reported...
October 17, 2018: Small
Yaqin Wang, Xinxin Xu, Luyao Liu, Jin Chen, Guimei Shi
Zn-air batteries, promising energy storage equipment with high energy density, light weight and a compact structure, are a perfect power source for electric vehicles. For a Zn-air battery, the activity of the air cathode electrocatalyst plays an important role in its performance. Here, employing a coordination polymer as a precursor, a composite material built from Co3O4 and Co-N active centres with nitrogen-doped mesoporous carbon as a matrix has been synthesized successfully. This composite material possesses outstanding activity and stability in the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) processes...
October 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Hamid Asiabi, Yadollah Yamini, Maryam Shamsayei, Esmaiel Saievar-Iranizad, Amir Bayat, Saeid Kamari Kaverlavani
Design and synthesis of effective electrocatalysts for oxygen reduction reaction in alkaline environments is critical to reduce energy losses in alkaline fuel cells. We have systematically evaluated new approaches for reducing the Pt content while retaining the activity of a Pt-based catalyst with hydrolytic phases containing hydroxide moieties in addition to metal ions and ligands. We report for the first time architectured organic-inorganic hybrid nanorod catalyst, which is fabricated by solvothermal reaction of K2 MCl4 (M = Pd, Pt) with picolinic acid (PA) (chelating agent) in the presence of FeCl2 ...
October 17, 2018: Scientific Reports
Xin Wang, Linzhou Zhuang, Yi Jia, Hongli Liu, Xuecheng Yan, Longzhou Zhang, Dongjiang Yang, Zhonghua Zhu, Xiangdong Yao
Various strategies, such as increasing active site numbers, structural and surface engineering, have been used to improve the oxygen evolution reaction (OER) performance of transition metal dichalcogenide. However, it is still a grand challenge to combine these strategies in one material system to realize the full catalytic potential. Herein, we firstly report an Ar/O2 plasma method to simultaneously induce exfoliation, surface reorganization (formation of an oxidative layer with rich oxygen vacancies) and phase transformation (cubic-to-orthorhombic) on cobalt diselenide (CoSe2) to generate an exceptionally outstanding OER electrocatalysts...
October 17, 2018: Angewandte Chemie
Yueyao Zhong, Bin Chang, Yongliang Shao, Chengwei Xu, Yongzhong Wu, Xiaopeng Hao
Phase engineering has been demonstrated as an efficient way to enhance the catalytic activity. Here, phase- and morphology-modulated Ni3Se2/NiSe nanorod arrays through hydrothermal process are reported. Partial phases conversion can effectively enhance the electrical conductivity and yield more active sites due to the atom rearrangement in the phase transformation progress. Quite low overpotential of 166 mV for hydrogen evolution reaction (HER) and and 370 mV oxygen evolution reaction (OER) are obtained in optimal sample with content of NiSe phase 32...
October 17, 2018: ChemSusChem
Tae-Ha Gu, Daniel Adjei Agyeman, Seung-Jae Shin, Xiaoyan Jin, Jang Mee Lee, Hyungjun Kim, Yong-Mook Kang, Seong-Ju Hwang
An effective chemical way to optimize the oxygen electrocatalyst and Li-O₂ electrode functionalities of metal oxide can be developed by the control of chemical bond nature with the surface anchoring of highly-oxidized selenate (SeO₄²-) clusters. The bond competition between (Se6+-O) and (Mn-O) bonds is quite effective in stabilizing Jahn-Teller-active Mn3+ state and in increasing oxygen electron density of α-MnO₂ nanowire (NW). The selenate-anchored α-MnO₂ NW shows excellent oxygen electrocatalytic activity and electrode performance for Li-O₂ batteries, which is due to the improved charge transfer kinetics and reversible formation/decomposition of Li₂O₂...
October 17, 2018: Angewandte Chemie
Min Jiang, Jun Li, Xiaofan Cai, Yu Zhao, Lijia Pan, Qingqi Cao, Dunhui Wang, Youwei Du
The development of noble-metal-free highly efficient oxygen evolution reaction (OER) catalysts is crucial for electrochemical energy technology but still challenging. Herein, ultrafine cobalt-iron bimetallic phosphide nanoparticles embedded in carbon nanosheets are synthesized using two-dimensional (2D) metal-organic frameworks (MOFs) as the precursor. The 2D morphology of the carbon matrix and the ultrafine character of Co1-xFexP nanoparticles make contributions to OER catalysis. By optimizing the molar ratio of Co/Fe atoms in MOFs, a series of Co1-xFexP/C catalysts are prepared...
October 17, 2018: Nanoscale
Ning Zhang, Baopeng Yang, Yuanqing He, Yulu He, Xiaohe Liu, Min Liu, Guoyong Song, Gen Chen, Anqiang Pan, Shuquan Liang, Renzhi Ma, Shishir Venkatesh, Vellaisamy A L Roy
Layered serpentine Ni3 Ge2 O5 (OH)4 is compositionally active and structurally favorable for adsorption and diffusion of reactants in oxygen evolution reactions (OER). However, one of the major problems for these materials is limited active sites and low efficiency for OER. In this regard, a new catalyst consisting of layered serpentine Ni3 Ge2 O5 (OH)4 nanosheets is introduced via a controlled one-step synthetic process where the morphology, size, and layers are well tailored. The theoretical calculations indicate that decreased layers and increased exposure of (100) facets in serpentine Ni3 Ge2 O5 (OH)4 lead to much lower Gibbs free energy in adsorption of reactive intermediates...
October 16, 2018: Small
Fatima Haidar, Mathieu Maas, Andrea Piarristeguy, Annie Pradel, Sara Cavaliere, Marie-Christine Record
Platinum is the most employed electrocatalyst for the reactions taking place in energy converters, such as the oxygen reduction reaction in proton exchange membrane fuel cells, despite being a very low abundant element in the earth's crust and thus extremely expensive. The search for more active electrocatalysts with ultra-low Pt loading is thus a very active field of investigation. Here, surface-limited redox replacement (SLRR) that utilizes the monolayer-limited nature of underpotential deposition (UPD) was used to prepare ultrathin deposits of Pt, using Te as sacrificial metal...
October 15, 2018: Nanomaterials
Zhaodi Huang, Jianhua Liu, Zhenyu Xiao, Hui Fu, Weidong Fan, Ben Xu, Bin Dong, Di Liu, Fangna Dai, Daofeng Sun
A coral-like NiSe@NC nanohybrid as an effective electrocatalyst for the hydrogen evolution reaction (HER) at all pH values, constructed via the in situ selenation of a Ni-MOFs precursor, is reported. The electrocatalyst shows overpotentials of 123 mV, 250 mV and 300 mV in 0.5 M H2SO4, 1.0 M KOH and 1.0 M PBS, respectively, to afford a current density of 10 mA cm-2. Meanwhile, NiSe@NC also exhibits a small Tafel slope and superior long-term stability over a wide pH range. The excellent electrocatalytic performance should be ascribed to the unique coral-like structure with a large BET specific surface area (125...
October 16, 2018: Nanoscale
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