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OER nanoparticles

Shumaila Ibraheem, Siguo Chen, Jia Li, Wei Li, XiaoYan Gao, Qingmei Wang, Zidong Wei
The electro-catalyzed oxygen reduction and evolution reactions (ORR/OER) are the key elements of many energy conversion systems, such as fuel cells, water electrolyzers and rechargeable metal-air batteries. Structural design of durable non-noble nanomaterials as bifunctional OER/ORR catalysts is a major drawback to commercial application. Herein, we exposed a strongly coupled hybrid material comprising of NiFeP-cubes nanoparticles supported on three-dimensional interconnected Fe,N-decorated carbon (3D-FeNC) as a robust bifunctional ORR/OER catalyst...
December 13, 2018: ACS Applied Materials & Interfaces
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
Lulu Chen, Wen Xiu Yang, Xiangjian Liu, Ling Long, Dandan Li, Jianbo Jia
The design of high-efficient and durable bi-functional oxygen electrocatalysts is still a great challenge. In this work, a novel Co9S8 nanoparticles/N,S-codoped defect-rich carbon nanotubes (Co9S8/N,S-CNTs) was fabricated by an ingenious template method. CdS nanowires, as a sacrificial template, can be removed simultaneously during the carbonization process without additional post-treatments. The large BET surface area (661.2 m2 g-1) and pore volume (1.49 cm3 g-1) of Co9S8/N,S-CNTs could largely enhance the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities by facilitating the mass transportation and exposing more active sites...
November 27, 2018: Nanotechnology
Yuanyuan Guo, Zhengfei Dai, Jun Lu, Xiaoqiao Zeng, Yifei Yuan, Xuanxuan Bi, Lu Ma, Tianpin Wu, Qingyu Yan, Khalil Amine
Low-cost and highly active electrocatalysts are attractive for Li-O2 applications. Herein, a 3D interconnected plate architecture consisting of ultra-small Co-Ni grains embedded in lithium hydroxide nanoplates (Co2Ni@LiOH) is designed and prepared by a lithiation strategy at room temperature. This catalyst exhibits a remarkably reduced charge potential of ~ 3.4 V at 50 µA cm-2, which leads to the high roundtrip efficiency of ~ 79%, among the best levels reported and a cycle life of up to 40 cycles. The well-aligned network facilitates the oxygen diffusion and the electrolyte penetration into the electrode...
December 4, 2018: ACS Applied Materials & Interfaces
Tingting Liu, Mian Li, Xiangjie Bo, Ming Zhou
Developing high-efficiency catalysis electrodes towards both HER (hydrogen evolution reaction) and OER (oxygen evolution reaction) is critical to the popularity and practical application of devices for conversion and storage of clean and renewable hydrogen energy by overall water splitting. In this paper, a series of transition metal alloy nanoparticles embedded hierarchically porous carbon nanosheets (denoted as Fex Coy @PCNSs) have been successfully designed and synthesized. After optimizing the metallic contents in Fex Coy alloy, Fe3 Co7 @PCNSs displays superior water electrolysis performances compared to other control samples and previously reported non-noble metal catalysts...
November 8, 2018: Journal of Colloid and Interface Science
Chi Zhang, Chen Zhang, Yunchao Xie, Jheng-Wun Su, Xiaoqing He, John Derek Demaree, Mark H Griep, Jerry L Atwood, Jian Lin
An iron oxide decorated nickel iron alloy nanoparticle/porous graphene hybrid exhibits high electrocatalytic activity and excellent durability toward oxygen evolution reaction (OER). It displays a low overpotential of 274 mV at 10 mA/cm2, and low Tafel slope of 37 mV/dec, showing a superior performance to the state-of-the-art RuO2 OER electrocatalyst.
November 15, 2018: Chemistry: a European Journal
Hangil Lee, Joo Yeon Kim, Si Young Lee, Jung A Hong, Namdong Kim, Jaeyoon Baik, Yun Jeong Hwang
Catalytic activities of transition metal-doped IrO2 nanoparticles (TM-IrO2 NPs; TM = Cr, Mn, Fe, Co, or Ni) are compared for various oxidation reactions such as electrochemical oxygen evolution reaction (OER), gas-phase photo-oxidation of thiol function group, and CO oxidative conversion. Here, we discovered a series of TM-IrO2 catalysts have a common activity trend for these oxidation reactions, and their activities are closely related with modified electronic states of IrO2 , strongly affected by the types of the transition metal across the periodic table...
November 13, 2018: Scientific Reports
Linghui Li, Li Song, Hu Guo, Wei Xia, Cheng Jiang, Bin Gao, Chao Wu, Tao Wang, Jianping He
Electrocatalysts with highly effective activity for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are considered to be the key factor of renewable energy technologies. Herein, we designed and synthesized bi-functional electrocatalyst Co9S8/C nanosheets (NSs) by reducing the Co3O4/C NS precursor with sodium sulfide. From the structural characterization, Co9S8 is anchored on the graphitized carbon NSs homogeneously. According to the electrochemical measurements, the Co9S8/C NSs show excellent electrocatalytic activity towards both the ORR (Eonset = 0...
November 9, 2018: Nanoscale
Wen Zhou, Xue-Feng Lu, Jun-Jia Chen, Tao Zhou, Pei-Qin Liao, Mingmei Wu, Gao-Ren Li
Searching for an economical and efficient water splitting electrocatalyst is still a huge challenge for hydrogen production. This work reports one-step synthesis of hierarchical porous prism arrays (HPPAs) composed of Ni-NiO nanoparticles embedding uniformly in graphite carbon (Ni-NiO/C HPPAs), which is derived from metal-organic framework (CPO-27-Ni) prism arrays grown on nickel foam (NF). Remarkable features of the prism arrays, synergistic effect of Ni-NiO/C, porous graphite carbon, high conductive NF, and good contact between catalyst and current collector result in excellent electrocatalytic performance of Ni-NiO/C HPPAs@NF...
November 14, 2018: ACS Applied Materials & Interfaces
Chenglong Lai, Jie Wang, Wen Lei, Cuijuan Xuan, Weiping Xiao, Tonghui Zhao, Ting Huang, Lingxuan Chen, Ye Zhu, Deli Wang
Exploring bifunctional oxygen electrode catalysts with efficient and stable oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) performance is one of the limitations for high-performance zinc-air battery. In this work, Ni3 Fe alloy nanoparticles incorporated in three-dimensional (3D) carbon nanotube (CNT)/graphene nanosheet composites with N and S codoping (Ni3 Fe/N-S-CNTs) as bifunctional oxygen electrode electrocatalysts for zinc-air battery. The main particle size of Ni3 Fe nanoparticles could be well restricted because of the unique 3D structure of carbon nanotube/graphene nanosheet composites (N-S-CNTs)...
October 29, 2018: ACS Applied Materials & Interfaces
Ying Wang, Tianjun Hu, Yanting Qiao, Yan Chen, Limin Zhang
A novel electrocatalyst of core-shell structural Co@Co3O4 nanoparticles embedded in an N-doped carbon nanosheet (N-C) (Co@Co3O4/N-C) has been in situ synthesized via a simple pyrolysis and subsequent oxidative calcination. The catalyst exhibits superior bifunctional catalytic activity for the ORR and OER, which is attributed to the synergetic effect between Co and Co3O4 and the carbon layer structure.
November 8, 2018: Chemical Communications: Chem Comm
Xiaolu Wang, Hai Xiao, Ang Li, Zhi Li, Shoujie Liu, Qinghua Zhang, Yue Gong, Lirong Zheng, Youqi Zhu, Chen Chen, Dingsheng Wang, Qing Peng, Lin Gu, Xiaodong Han, Jun Li, Yadong Li
Metal-organic frameworks (MOF) have recently emerged as versatile precursors to fabricate functional MOF derivatives for oxygen evolution reactions (OER). Herein, we developed a controlled partial pyrolysis strategy to construct robust NiCo/Fe3 O4 heteroparticles within MOF-74 for efficient OER using trimetallic NiCoFe-MOF-74 as precursor. The partial pyrolysis method preserves the framework structure of MOF for effective substrates diffusion while producing highly active nanoparticles. The as-prepared NiCo/Fe3 O4 /MOF-74 delivered remarkably stable OER current with an overpotential as low as 238 mV at 10...
November 1, 2018: Journal of the American Chemical Society
Kang Yang, Pengping Xu, Zhiyu Lin, Yang Yang, Peng Jiang, Changlai Wang, Shuai Liu, Shipeng Gong, Lin Hu, Qianwang Chen
Developing highly active electrocatalysts with superior durability for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in the same electrolyte is a grand challenge to realize the practical application of electrolysis water for producing hydrogen. In this work, an ultrasmall Ru/Cu-doped RuO2 complex embedded in an amorphous carbon skeleton is synthesized, through thermolysis of Ru-modified Cu-1,3,5-benzenetricarboxylic acid (BTC), as a highly efficient bifunctional catalyst for overall water splitting electrocatalysis...
October 2018: Small
Binbin Jiang, Tao Wang, Yafei Cheng, Fan Liao, Konglin Wu, Mingwang Shao
Nitrogen-doped graphene (NG) chemically coupled with graphitic carbon nitride (g-C3 N4 ) may facilitate the kinetics of overall electrochemical water splitting. Herein, a facile strategy is adopted to synthesize monodispersed Ir nanoparticles on g-C3 N4 /NG layers. Benefiting from the synergistic effect between different components of the catalyst, the optimal Ir/g-C3 N4 /NG catalyst with a low content of Ir (5.9 wt %) exhibits highly active for electrochemical water splitting in acidic electrolyte. Specifically, as a hydrogen evolution reaction catalyst, the optimal Ir/g-C3 N4 /NG exhibits a Tafel slope of 22 mV·dec-1 ...
November 14, 2018: ACS Applied Materials & Interfaces
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 the 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 high efficiency toward OER. TiN is found not only to disperse the IrO2 @Ir nanoparticles effectively but also to exert the electronic modulation of 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 the current density of 10 mA cm-2 is only 265 mV for the IrO2 @Ir/TiN (60 wt %) catalyst...
October 29, 2018: ACS Applied Materials & Interfaces
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...
November 1, 2018: Nanoscale
Chao Lin, Yonghui Zhao, Haojie Zhang, Songhai Xie, Ye-Fei Li, Xiaopeng Li, Zheng Jiang, Zhi-Pan Liu
Phase transformation of electrode materials widely occurs in electrocatalytic reactions. Metal oxides are promising electrocatalysts for the oxygen evolution reaction (OER); their phase transformation is a key step for the multi-electron OER, and requires extra overpotential. However, little attention has been paid to accelerating and enhancing the phase transformation. Here, we report for the first time that single-atom Pt incorporated into the bulk crystalline phase of porous NiO nanocubes (0.5 wt% Pt/NiO) can greatly promote the active phase (NiOOH) evolution...
September 7, 2018: Chemical Science
Mingrui Guo, Yi Liu, Shun Dong, Xiuling Jiao, Ting Wang, Dairong Chen
Co9S8 crystals can catalyze the growth of thin-walled graphite microtubes (GMTs) via a catalytic chemical vapor deposition (CCVD) process using thiourea as the precursors. The growth of the GMTs follows a tip-growth mechanism with tube diameters up to a few microns. The hollow interiors of the GMTs are filled with carbon nanotubes and wrinkled graphene layers, form a unique nanotube/graphene-in-microtube structure. As-formed GMTs are N, S-codoped with lots of Co9S8 nanoparticles encapsulated in their inner walls...
October 10, 2018: ChemSusChem
Xu Liu, Lei Wang, Peng Yu, Chungui Tian, Fanfei Sun, Jingyuan Ma, Wei Li, Honggang Fu
Low-cost, efficient bifunctional electrocatalysts are needed to mediate the oxygen reduction and oxygen evolution reactions (ORR/OER) in Zn-air batteries. Such catalysts should offer binary active sites and an ability to transfer oxygen-based species and electrons. A 3D catalyst, composed of nanoparticles of CoFe alloy embedded in N-doped carbon nanotubes tangled with reduced graphene oxide, was developed, which presents appreciable ORR/OER activity when applied in a Zn-air battery. A high open-circuit voltage of 1...
October 10, 2018: Angewandte Chemie
Yi Li, Yazhou Zhou, Hejing Wen, Juan Yang, Chanez Maouche, Qinqin Liu, Yunyan Wu, Chao Cheng, Jia Zhu, Xiaonong Cheng
The intrinsic instability and difficulty in controlling the uniform size distributions of cobalt sulfides greatly restrict their application for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) as a bifunctional electrocatalyst in regenerative fuel cells and rechargeable metal-air batteries. Herein, we synthesize a stable electrocatalyst of N,S-atom-coordinated Co9S8 trinary dopants within a porous graphene framework (Co9S8@NS-3DrGO), in which Co9S8 nanoparticles show uniform sizes and distributions...
October 30, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
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