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Research progress in tribo-electrochemistry and tribo-electrochemical polishing

ZHAI Wenjie

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4,   Pages 463-467 doi: 10.1007/s11465-007-0080-0

Abstract: In this paper, the status quo and recent progress in the research on tribo-electrochemistry in aqueous

Keywords： tribo-electrochemical mechanisms     planarization     non-aqueous     tribo-electrochemistry     summary    

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Study on tribological and electrochemistry properties of metal materials in H2O2 solutions

Chengqing YUAN, Li YU, Jian LI, Xinping YAN

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 1,   Pages 93-98 doi: 10.1007/s11465-012-0313-8

Abstract: There were significant differences in the tribological and electrochemistry properties of the rubbing

Keywords： hydrogen peroxide     wear     corrosion     wear mechanism    

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Enabling nickel ferrocyanide nanoparticles for high-performance ammonium ion storage

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 2,   Pages 226-235 doi: 10.1007/s11705-022-2198-3

Abstract: Prussian blue and its analogs are extensively investigated as a cathode for ammonium-ion batteries. However, they often suffer from poor electronic conductivity. Here, we report a Ni2Fe(CN)6/multiwalled carbon nanotube composite electrode material, which is prepared using a simple coprecipitation approach. The obtained material consists of nanoparticles with sizes 30–50 nm and the multiwalled carbon nanotube embedded in it. The existence of multiwalled carbon nanotube ensures that the Ni2Fe(CN)6/multiwalled carbon nanotube composite shows excellent electrochemical performance, achieving a discharge capacity of 55.1 mAh·g–1 at 1 C and 43.2 mAh·g–1 even at 15 C. An increase in the ammonium-ion diffusion coefficient and ionic/electron conductivity based on kinetic investigations accounts for their high performance. Furthermore, detailed ex situ characterizations demonstrate that Ni2Fe(CN)6/multiwalled carbon nanotube composite offers three advantages: negligible lattice expansion during cycling, stable structure, and the reversible redox couple. Therefore, the Ni2Fe(CN)6/multiwalled carbon nanotube composite presents a long cycling life and high rate capacity. Finally, our study reports a desirable material for ammonium-ion batteries and provides a practical approach for improving the electrochemical performance of Prussian blue and its analogs.

Keywords： nickel ferrocyanides     NH4+     electrochemistry     Prussian blue     aqueous ammonium ion    

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Electrochemical CO reduction to C products over CuZn intermetallic catalysts synthesized by electrodeposition

Frontiers in Energy doi: 10.1007/s11708-023-0898-0

Abstract: Electrocatalytic CO2 reduction (ECR) offers an attractive approach to realizing carbon neutrality and producing valuable chemicals and fuels using CO2 as the feedstock. However, the lack of cost-effective electrocatalysts with better performances has seriously hindered its application. Herein, a one-step co-electrodeposition method was used to introduce Zn, a metal with weak *CO binding energy, into Cu to form Cu/Zn intermetallic catalysts (Cu/Zn IMCs). It was shown that, using an H-cell, the high Faradaic efficiency of C2+ hydrocarbons/alcohols (FEC2+) could be achieved in ECR by adjusting the surface metal components and the applied potential. In suitable conditions, FEC2+ and current density could be as high as 75% and 40 mA/cm2, respectively. Compared with the Cu catalyst, the Cu/Zn IMCs have a lower interfacial charge transfer resistance and a larger electrochemically active surface area (ECSA), which accelerate the reaction. Moreover, the *CO formed on Zn sites can move to Cu sites due to its weak binding with *CO, and thus enhance the C–C coupling on the Cu surface to form C2+ products.

Keywords： carbon dioxide electroreduction     electrochemistry     co-electrodeposition     intermetallic catalysts     value-added    

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Effect of placement angles on wireless electrocoagulation for bipolar aluminum electrodes

Zhenlian Qi, Jinna Zhang, Shijie You

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 3, doi: 10.1007/s11783-018-1034-y

Abstract: We in our previous study reported the wireless electrocoagulation (WEC) based on bipolar electrochemistry

Keywords： Bipolar electrochemistry     Wireless electrocoagulation     Placement angle    

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Sustainable Generation of Sulfate Radicals and Decontamination of Micropollutants via Sequential Electrochemistry Article

Wentian Zheng,Shijie You,Yuan Yao,Nanqi Ren,Bin Ding,Fang Li,Yanbiao Liu

Engineering 2023, Volume 30, Issue 11,   Pages 144-152 doi: 10.1016/j.eng.2022.12.005

Abstract: advanced chemical-free strategy for micropollutants decontamination that is solely based on sequential electrochemistry

Keywords： Advanced oxidation     Chain reaction     Sulfate radical     Micropollutants     Sequential electrochemistry    

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nanoparticle decorated N-doped carbons derived from a cobalt covalent organic framework for oxygen electrochemistry

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 6,   Pages 1550-1560 doi: 10.1007/s11705-021-2104-4

Abstract: The low cost and highly efficient construction of electrocatalysts has attracted significant attention owing to the use of clean and sustainable energy technologies. In this work, cobalt nanoparticle decorated N-doped carbons (Co@NC) are synthesized by the pyrolysis of a cobalt covalent organic framework under an inert atmosphere. The Co@NC demonstrates improved electrocatalytic capabilities compared to N-doped carbon without the addition of Co nanoparticles, indicating the important role of cobalt. The well-dispersed active sites (Co-Nx) and the synergistic effect between the carbon matrix and Co nanoparticles greatly enhance the electrocatalytic activity for the oxygen reduction reaction. In addition, the Co content has a significant effect on the catalytic activity. The resulting Co@NC-0.86 exhibits a superb electrocatalytic activity for the oxygen reduction reaction in an alkaline electrolyte in terms of the onset potential (0.90 V), half-wave potential (0.80 V) and the limiting current density (4.84 mA·cm–2), and a high selectivity, as well as a strong methanol tolerance and superior durability, these results are comparable to those of the Pt/C catalyst. Furthermore, the superior bifunctional activity of Co@NC-0.86 was also confirmed in a home-built Zn-air battery, signifying the possibility for application in electrode materials and in current energy conversion and storage devices.

Keywords： cobalt embedment     N-doped carbons     covalent organic framework     oxygen reduction     Zn-air battery    

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国际电化学学会第70届年会（70th Annual Meeting of the International Society of Electrochemistry）

Conference Date: 4 Aug 2019

Conference Place: 南非/德班

Administered by: 国际电化学学会（ISE）

Metal phosphonate-derived cobalt/nickel phosphide@N-doped carbon hybrids as efficient bifunctional oxygen electrodes for Zn−air batteries

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 9,   Pages 1367-1376 doi: 10.1007/s11705-022-2153-3

Abstract: The exploration of efficient bifunctional electrocatalysts for oxygen reduction reaction and oxygen evolution reaction is pivotal for the development of rechargeable metal–air batteries. Transition metal phosphides are emerging as promising catalyst candidates because of their superb activity and low cost. Herein, a novel metal phosphonate-derived cobalt/nickel phosphide@N-doped carbon hybrid was developed by a carbothermal reduction of cobalt/nickel phosphonate hybrids with different Co/Ni molar ratios. The metal phosphonate derivation method achieved an intimately coupled interaction between metal phosphides and a heteroatom-doped carbon substrate. The resultant Co2P/Ni3P@NC-0.2 enables an impressive electrocatalytic oxygen reduction reaction activity, comparable with those of state-of-the-art Pt/C catalysts in terms of onset potential (0.88 V), 4e‒ selectivity, methanol tolerance, and long-term durability. Moreover, remarkable oxygen evolution reaction activity was also observed in alkaline conditions. The high activity is ascribed to the N-doping, abundant accessible catalytic active sites, and the synergistic effect among the components. This work not only describes a high-efficiency electrocatalyst for both oxygen reduction reaction and oxygen evolution reaction, but also highlights the application of metal phosphonate hybrids in fabricating metal phosphides with tunable structures, which is of great significance in the energy conversion field.

Keywords： metal phosphonate     cobalt/nickel phosphide     N-doped carbon     oxygen electrochemistry     Zn−air battery    

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Probing the redox process of

Rui Lu, Wei Chen, Wen-Wei Li, Guo-Ping Sheng, Lian-Jun Wang, Han-Qing Yu

Frontiers of Environmental Science & Engineering 2017, Volume 11, Issue 1, doi: 10.1007/s11783-017-0905-y

Abstract: Fluorescece spectroelectrochemistry is used to probe redox process of benzoquinone. The benzoquinone reduction state has a lower fluorescence quantum efficiency. CVF and DCVF can reveal more information about benzoquinone redox reactions. This method can analyze compounds with fluorescence and electrochemical activities. Quinones are common organic compounds frequently used as model dissolved organic matters in water, and their redox properties are usually characterized by either electrochemical or spectroscopic methods separately. In this work, electrochemical methodology was combined with two fluorescence spectroelectrochemical techniques, cyclic volta- fluorescence spectrometry (CVF) and derivative cyclic volta- fluorescence spectrometry (DCVF), to determine the electrochemical properties of -benzoquinone in dimethyl sulfoxide, an aprotic solution. The CVF results show that the electrochemical reduction of -benzoquinone resulted in the formation of radical anion and dianion, which exhibited a lower fluorescence intensity and red-shift of the emission spectra compared to that of -benzoquinone. The fluorescence intensity was found to vary along with the electrochemical oxidation and reduction of -benzoquinone. The CVF and DCVF results were in good consistence. Thus, the combined method offers a powerful tool to investigate the electrochemical process of -benzoquinone and other natural organic compounds.

Keywords： p-Benzoquinone     Electrochemistry     Fluorescence     Spectroelectrochemistry     Derivative cyclic volta    

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Electrochemistry during efficient copper recovery from complex electronic waste using ammonia based solutions

Zhi Sun, Hongbin Cao, Prakash Venkatesan, Wei Jin, Yanping Xiao, Jilt Sietsma, Yongxiang Yang

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3,   Pages 308-316 doi: 10.1007/s11705-016-1587-x

Abstract: Leaching selectivity during metal recovery from complex electronic waste using a hydrochemical process is always one of the generic issues. It was recently improved by using ammonia-based leaching process, specifically for electronic waste enriched with copper. This research proposes electrodeposition as the subsequent approach to effectively recover copper from the solutions after selective leaching of the electronic waste and focuses on recognising the electrochemical features of copper recovery. The electrochemical reactions were investigated by considering the effects of copper concentration, scan rate and ammonium salts. The diffusion coefficient, charge transfer coefficient and heterogeneous reaction constant of the electrodeposition process were evaluated in accordance with different solution conditions. The results have shown that electrochemical recovery of copper from ammonia-based solution under the conditions of selective electronic waste treatment is charge transfer controlled and provide bases to correlate the kinetic parameters with further optimisation of the selective recovery of metals from electronic waste.

Keywords： copper recovery     electronic waste     end-of-life products     selective leaching     electrodeposition    

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Engineering Research Progress of Electrochemical Microreaction Technology—A Novel Method for Electrosynthesis of Organic Chemicals Review

Siyuan Zheng, Junyu Yan, Kai Wang

Engineering 2021, Volume 7, Issue 1,   Pages 22-32 doi: 10.1016/j.eng.2020.06.025

Abstract:

Electrochemical methods are environmentally friendly and have unique advantages in the synthesis of organic chemicals. However, their implementation is limited due to the complex transport problems posed by traditional electrochemical reactors. Recently, the application of microreaction technology in electrosynthesis studies has reduced the transport distance of ions and increased the specific surface area of electrodes, leading to efficient, successive, and easily scaled-up electrosynthesis technologies. In this review article, engineering advantages of using microchannels in electrosynthesis are discussed from process enhancement perspective. Flow patterns and mass transfer behaviors in recently reported electrochemical microreactors are analyzed, and prototypes for the reactor scale-up are reviewed. As a relatively new research area, many scientific rules and engineering features of electrosynthesis in microreactors require elucidation. Potential research foci, considered crucial for the development of novel electrosynthesis technology, are therefore proposed.

Keywords： Electrochemistry     Electrosynthesis     Microreactor     Flow chemistry    

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Two-dimensional self-assembly of melem and melemium cations at pH-controlled aqueous solution–Au(111) interfaces under electrochemical control

Shinobu Uemura,Kenki Sakata,Masashi Aono,Yusuke Nakamura,Masashi Kunitake

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 2,   Pages 294-300 doi: 10.1007/s11705-016-1564-4

Abstract: Two-dimensional self-assembly of melem at pH-controlled aqueous solution-Au(111) interfaces has been investigated by electrochemical scanning tunneling microscopy. In the solutions with pH>p of melem, two ordered self-assembled structures (honeycomb and close-packed structures) and one disordered fibrillar structure were observed as a function of the surface coverage of melem controlled by the electrode potential. In contrast, in the acidic solution with pH

Keywords： self-assembly     scanning tunneling microscopy     electrochemistry     structural phase transition     melem    

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Microbial Electrosynthesis for Producing Medium Chain Fatty Acids Article

Na Chu, Wen Hao, Qinglian Wu, Qinjun Liang, Yong Jiang, Peng Liang, Zhiyong Jason Ren, Raymond Jianxiong Zeng

Engineering 2022, Volume 16, Issue 9,   Pages 141-153 doi: 10.1016/j.eng.2021.03.025

Abstract:

Microbial electrosynthesis (MES) employs microbial catalysts and electrochemistry to enhance CO

Keywords： Electro-fermentation     Microbial electrochemistry     Acetogen     Chain elongation     Electroactive microorganism    

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Title Author Date Type Operation

Research progress in tribo-electrochemistry and tribo-electrochemical polishing

ZHAI Wenjie

Journal Article

Study on tribological and electrochemistry properties of metal materials in H2O2 solutions

Chengqing YUAN, Li YU, Jian LI, Xinping YAN

Journal Article

Enabling nickel ferrocyanide nanoparticles for high-performance ammonium ion storage

Journal Article

Electrochemical CO reduction to C products over CuZn intermetallic catalysts synthesized by electrodeposition

Journal Article

Effect of placement angles on wireless electrocoagulation for bipolar aluminum electrodes

Zhenlian Qi, Jinna Zhang, Shijie You

Journal Article

Sustainable Generation of Sulfate Radicals and Decontamination of Micropollutants via Sequential Electrochemistry

Wentian Zheng,Shijie You,Yuan Yao,Nanqi Ren,Bin Ding,Fang Li,Yanbiao Liu

Journal Article

nanoparticle decorated N-doped carbons derived from a cobalt covalent organic framework for oxygen electrochemistry

Journal Article

国际电化学学会第70届年会（70th Annual Meeting of the International Society of Electrochemistry）

4 Aug 2019

Conference Information

Metal phosphonate-derived cobalt/nickel phosphide@N-doped carbon hybrids as efficient bifunctional oxygen electrodes for Zn−air batteries

Journal Article

Probing the redox process of

Rui Lu, Wei Chen, Wen-Wei Li, Guo-Ping Sheng, Lian-Jun Wang, Han-Qing Yu

Journal Article

Electrochemistry during efficient copper recovery from complex electronic waste using ammonia based solutions

Zhi Sun, Hongbin Cao, Prakash Venkatesan, Wei Jin, Yanping Xiao, Jilt Sietsma, Yongxiang Yang

Journal Article

Engineering Research Progress of Electrochemical Microreaction Technology—A Novel Method for Electrosynthesis of Organic Chemicals

Siyuan Zheng, Junyu Yan, Kai Wang

Journal Article

Two-dimensional self-assembly of melem and melemium cations at pH-controlled aqueous solution–Au(111) interfaces under electrochemical control

Shinobu Uemura,Kenki Sakata,Masashi Aono,Yusuke Nakamura,Masashi Kunitake

Journal Article

Microbial Electrosynthesis for Producing Medium Chain Fatty Acids

Na Chu, Wen Hao, Qinglian Wu, Qinjun Liang, Yong Jiang, Peng Liang, Zhiyong Jason Ren, Raymond Jianxiong Zeng

Journal Article