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OER nanoparticles

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
Developing low-cost and high-efficient bifunctional ORR/OER electrocatalyst, featured by binary active sites, excellent transfer for oxygen-relevant species and electrons, is still challenging for Zn-air batteries. Herein, we have designed a 3D catalyst composed of CoFe alloy nanoparticles embedded in N-doped bamboo-like CNTs tangled with RGO, which has above features and exhibits well ORR/OER bifunctional activity. Specially, a fabricated liquid Zn-air battery could deliver 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 10, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yinle Li, Baoming Jia, Boyuan Chen, Qinglin Liu, Mengke Cai, Ziqian Xue, Yanan Fan, Hai-Ping Wang, Cheng-Yong Su, Guangqin Li
Searching for highly active and stable bifunctional electrocatalysts for overall water splitting, e.g., for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), is dominating in terms of bringing future renewable energy storage and conversion processes to reality. In this work, a kind of two-dimensional ultrathin manganese (Mn) doped polyhedral cobalt phosphide (Mn-CoP) has been synthesized via the etching-carbonization-phosphidation of Co-centered metal-organic frameworks. The as-prepared porous Mn-CoP nanosheets had a larger specific surface area and higher porosity, furnishing them with more plentiful catalytically active sites than their counterpart hollow CoP and Mn-CoP nanoparticles, and thus showed much better electrocatalytic activity for both HER and OER in acidic and alkaline media...
October 2, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Elif Demir, Serdar Akbayrak, Ahmet M Önal, Saim Özkar
Ruthenium(0) nanoparticles were successfully prepared on the surface of ceria (Ru0 /CeO2 ) and used as catalysts on glassy carbon electrode (GCE) in oxygen evolution reaction (OER) from water electrolysis at room temperature. Ru0 /CeO2 on GCE exhibits high catalytic activity for OER in alkaline solution. It provides a low onset potential of 1.57 V vs. RHE and low overpotential of 420 mV vs. RHE to reach a current density of 10 mA cm-2 . Ru0 /CeO2 on GCE shows no change in the onset potential value even after 6...
September 22, 2018: Journal of Colloid and Interface Science
Changhong Wang, Yun Wang, Hongchao Yang, Yejun Zhang, Huijun Zhao, Qiangbin Wang
Establishing a correlation between the crystal structure and electrocatalytic activity is crucial to the rational design of high performance electrocatalysts. In this work, taking the widely investigated nickel (Ni) based nonprecious oxygen evolution reaction (OER) catalyst as an example, for the first time, it is reported that the crystal structure plays a critical role in determining the OER performance. Similar-sized nickel nanoparticles but in different hexagonal close-packed phase and face-centered cubic phase coated with N-doped carbon shells, noted as hcp-Ni@NC and fcc-Ni@NC, are successfully prepared, respectively, in which the N-coated carbon shell structures were also similar...
October 2018: Small
Jie Yu, Yijun Zhong, Xinhao Wu, Jaka Sunarso, Meng Ni, Wei Zhou, Zongping Shao
Hydrogen production from renewable electricity relies upon the development of an efficient alkaline water electrolysis device and, ultimately, upon the availability of low cost and stable electrocatalysts that can promote oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Normally, different electrocatalysts are applied for HER and OER because of their different reaction intermediates and mechanisms. Here, the synthesis of a heterostructured CoP@a-CoOx plate, which constitutes the embedded crystalline cobalt phosphide (CoP) nanoclusters and amorphous cobalt oxides (CoOx) nanoplates matrix, via a combined solvothermal and low temperature phosphidation route is reported...
September 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Debanjan Das, Saswati Santra, Karuna Kar Nanda
Despite the recent promise of transition metal carbides as nonprecious catalysts for the hydrogen evolution reaction (HER), their extension to the oxygen evolution reaction (OER) to achieve the goal of overall water splitting remains a significant challenge. Herein, a new Ni/Mo x C (MoC, Mo2 C) nanoparticle-supported N-doped graphene/carbon nanotube hybrid (NC) catalyst is developed via a facile, one-step integrated strategy, which can catalyze both the HER and OER in an efficient and robust manner. The catalyst affords low overpotentials of 162 and 328 mV to achieve a current density of 10 mA/cm2 for HER and OER, respectively, in alkaline medium, which either compares favorably or exceeds most of the Mo-based catalysts documented in the literature...
October 8, 2018: ACS Applied Materials & Interfaces
Soumen Dutta, Arindam Indra, HyukSu Han, Taeseup Song
The development of noble-metal-free, efficient electrochemical water splitting catalyst systems has attracted considerable attention in recent times. In this study, we develop a metal-organic framework (MOF)-based synthetic route to couple two non-noble metal-based catalysts, CoP and Mo2C, supported on nitrogen-doped carbon. Our strategy enables formation of a nanohybrid with an attractive pea-like morphology, in which ~ 10 nm spherical CoP particles are embedded on two-dimensional nitrogen-doped carbon enriched with ultrafine Mo2C nanoparticles...
September 19, 2018: ChemSusChem
Xixi Wang, Yu Yang, Lechen Diao, Yu Tang, Fang He, Enzuo Liu, Chunnian He, Chunsheng Shi, Jiajun Li, Junwei Sha, Shuaihua Ji, Ping Zhang, Liying Ma, Naiqin Zhao
As a promising bifunctional electrocatalyst for water splitting, NiFe-layered double hydroxide (NiFe LDH) demonstrates an excellent activity toward oxygen evolution reaction (OER) in alkaline solution. However, its hydrogen evolution reaction (HER) activity is challenged owing to the poor electronic conductivity and insufficient electrochemical active sites. Therefore, a three-dimensional self-supporting metal hydroxide/oxide electrode with abundant oxygen vacancies is prepared by electrodepositing CeO x nanoparticles on NiFe LDH nanosheets...
October 3, 2018: ACS Applied Materials & Interfaces
Mohammad Fathi Tovini, Bhushan Patil, Cevriye Koz, Tamer Uyar, Eda Yılmaz
A 3D RuO2 /Mn2 O3 /carbon nanofiber (CNF) composite has been prepared in this study by a facile two step microwave synthesis, as a bi-functional electrocatalyst towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). RuO2 nanoparticles with the mean size of 1.57 nm are uniformly distributed on Mn2 O3 nano-rods grown on electrospun CNFs. The electrocatalytic activity of the composites are investigated towards ORR/OER under alkaline condition. The ternary RuO2 /Mn2 O3 /CNF composite showed superior ORR activity in terms of onset potential (0...
November 23, 2018: Nanotechnology
Guanghua Wang, Jing Li, Mingrui Liu, Li Du, Shijun Liao
The development of carbon-based catalysts with satisfactory performance for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical but challenging to achieve sustainable energy conversion and storage. Herein, a pollen biomass-derived carbon electrocatalyst with a three-dimensional porous framework, coupled with uniform distribution of FeSe nanoparticles, has been prepared by pyrolysis of the pollen precursor, followed by selenylation. The optimal catalyst FeSe/NC-PoFeSe exhibits a superb ORR activity with a half-wave potential of 0...
September 26, 2018: ACS Applied Materials & Interfaces
Yana Men, Xiaochen Liu, Fulin Yang, Fusheng Ke, Gongzhen Cheng, Wei Luo
Transition metal oxides have received great attention for boosting the performances for lithium-ion batteries and oxygen evolution reaction (OER). Here, hollow Co3 O4 nanoparticles encapsulated in reduced graphene oxide (rGO) ( h-Co3 O4 @rGO) were synthesized through a two-step annealing process of graphene oxide wrapped zeolitic imidazolate framework-67 (ZIF-67@GO) precursors. By taking advantage of the enhanced conductivity, high dispersity, high surface area, and unique hollow morphology derived from the GO-wrapped protecting annealing strategy, the as-synthesized h-Co3 O4 @rGO composite not only exhibits a reversible capacity as high as 1154...
September 4, 2018: Inorganic Chemistry
Jianwen Huang, Yinghui Sun, Xinchuan Du, Yadong Zhang, Chunyang Wu, Chaoyi Yan, Yichao Yan, Guifu Zou, Wenqi Wu, Ruifeng Lu, Yanrong Li, Jie Xiong
Surface/interface design is one of the most significant and promising motivations to develop high-performance catalysts for electrolytic water splitting. Here, the nature of cytomembrane having the most effective and functional surface structure is mimicked to fabricate a new configuration of Ni-N-O porous interface nanoparticles (NiNO INPs) with strongly interacting nanointerface between the Ni3 N and NiO domains, for enhancing the electrocatalytic oxygen evolution reaction (OER) performance. The combination of transmission electron microscopy and electrochemical investigations, tracking the correlation between microstructure evolution and catalytic activity, demonstrate the strongly coupled nanointerface for an approximately sixfold improvement of electrolytic efficiency...
September 2018: Advanced Materials
Yun Tong, Junchi Wu, Pengzuo Chen, Haifeng Liu, Wangsheng Chu, Changzheng Wu, Yi Xie
Perovskites are prototype electrocatalyts benefiting from their high terrestrial availability and high stability. Electronic state regulation plays a key role in promising higher electrocatalytic efficiencies. Herein, we highlighted a vibronic superexchange in double perovskite to synergistically optimize eg electron filling state and increase the formation of active species on the surface of catalysts. Vibronic superexchange of Ni3+ -O-Mn3+ in La2 NiMnO6 nanoparticles brings the optimal eg electron filling state of Mn and Ni ions toward unity...
September 12, 2018: Journal of the American Chemical Society
Fangbing Shi, Zhibin Geng, Keke Huang, Qingshuang Liang, Yuan Zhang, Yu Sun, Jungang Cao, Shouhua Feng
Black phosphorus (BP) nanosheet (NS) is an emerging oxygen evolution reaction (OER) electrocatalyst with both high conductivity and abundant active sites. However, its ultrathin structure suffers instability because of the lone pair electrons exposed at the surface, which badly restricts durability for achieving long-term OER catalysis. Herein, a facile solvothermal reduction route is designed to fabricate Co/BP NSs hybrid electrocatalyst by in situ growth of cobalt nanoparticles on BP NSs. Notably, electronic structure engineering of Co/BP NSs catalyst is observed by electron migration from BP to Co due to the higher Fermi level of BP than that of Co...
August 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
JunRan Jia, MengKe Zhai, JingJing Lv, BaoXun Zhao, HongBin Du, JunJie Zhu
Non-noble-metal electrocatalysts for water splitting hold great promises for developing sustainable and clean energy sources. Herein, a highly efficient bifunctional electrode consisting of Ni-doped molybdenum nitride nanorods on Ni foam is prepared through topotactic transformation of NiMoO4 nanorods that are in situ hydrothermally grown on Ni foam. The electrode not only contains rich, accessible, electrochemically active sites but also possesses extraordinary chemical stability. It exhibits excellent hydrogen evolution reaction and oxygen evolution reaction performance in 1...
September 12, 2018: ACS Applied Materials & Interfaces
Fatemeh Davodi, Elisabeth Mühlhausen, Mohammad Tavakkoli, Jani Sainio, Hua Jiang, Bilal Gökce, Galina Marzun, Tanja Kallio
Earth-abundant element-based inorganic-organic hybrid materials are attractive alternatives for electrocatalyzing energy conversion reactions. Such material structures do not only increase the surface area and stability of metal nanoparticles (NPs) but also modify the electrocatalytic performance. Here, we introduce, for the first time, multiwall carbon nanotubes (MWNTs) functionalized with nitrogen-rich emeraldine salt (ES) (denoted as ES-MWNT) as a promising catalyst support to boost the electrocatalytic activity of magnetic maghemite (γ-Fe2 O3 ) NPs...
September 19, 2018: ACS Applied Materials & Interfaces
Yuhang Wu, Mengting Lu, Yuwen Li, Panpan He, Sireesh Babu Maddine, Junkuo Gao, Juming Yao
Hydrogen production is one of the most effective methods for combating the global energy crisis. However, improving the electrochemical performance of oxygen-evolution catalysts is a significant challenge. In this paper, exceptionally active electrocatalysts for oxygen-evolution reactions (OERs) were successfully developed and characterized by using SEM, TEM, XRD, BET, and X-ray photoelectron spectroscopy. The nitrogen-doped hollow-carbon-encapsulated bimetallic nanoparticles (MM'-NHCNPs) were prepared by using folic acid coordination polymerization...
August 14, 2018: Chemistry, An Asian Journal
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