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11 results on '"Zheng, Hongju"'

4. Fault-Controlled on Hydrocarbon Migration and Accumulation of Baodao Northern Slope in the Qiongdongnan Basin, South China Sea

Author

Zhang, Xinshun, Zheng, Hongju, Bian, Congsheng, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Amer, Mourad, Series Editor, Banerjee, Santanu, editor, Barati, Reza, editor, and Patil, Shirish, editor

Published
2019
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5. Multiple Tuning of the Local Environment Enables Selective CO2 Electroreduction to Ethylene in Neutral Electrolytes.

Author

Zhou, WeiLiang, Zheng, Hongju, Li, Xuan, Meng, Na, Feng, Chao, Yang, Hengpan, Hu, Qi, and He, Chuanxin

Subjects
*ELECTROLYTIC reduction, *ELECTRIC field effects, *ELECTROLYTES, *COUPLING reactions (Chemistry), *ACTIVATION energy, *NANOWIRES, *CARBON dioxide reduction
Abstract

Recently, vigorous progress is made in the selective and high‐current reduction of carbon dioxide (CO2) to ethylene (C2H4) by using a flow cell. In most cases, however, the reduction is only achieved in strong alkaline electrolytes, which results in substantial deactivation of electrocatalysts due to the accumulation of precipitates. Here, porous Cu nanowires (NWs) is prepared with abundant atomic defects, which create a synergy with the pore‐induced electric field to comprehensively tune the local microenvironment of the electrode surface, thus enabling efficient and stable C2H4 production from the CO2 reduction reaction (CO2RR) in neutral media. In particular, the enhanced electric field effect increases the local K+ concentration for the generation of *CO intermediates; while the atomic defects stabilize OH− and *CO, leading to high local pH and *CO coverage. Such synergy can provide a favorable local environment and high *CO coverage for significantly decreasing the energy barrier of the C─C coupling step. Consequently, a large partial C2H4 current density of 222.3 mA cm−2 with excellent stability is achieved in a neutral electrolyte. Altogether, this work paves new pathways to promote C2H4 production in the neutral CO2RR through multiple tuning of the local environment. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Grain Boundaries Engineering of Hollow Copper Nanoparticles Enables Highly Efficient Ammonia Electrosynthesis from Nitrate

Author

Hu, Qi, Qin, Yongjie, Wang, Xiaodeng, Zheng, Hongju, Gao, Keru, Yang, Hengpan, Zhang, Peixin, Shao, Minhua, He, Chuanxin, Hu, Qi, Qin, Yongjie, Wang, Xiaodeng, Zheng, Hongju, Gao, Keru, Yang, Hengpan, Zhang, Peixin, Shao, Minhua, and He, Chuanxin

Abstract

Electrochemical nitrate reduction reaction (NO3−RR) is an ideal route to produce ammonia (NH3) under ambient conditions. Although a markedly improved NH3 production rate has been achieved on the NO3−RR compared with the nitrogen reduction reaction (NRR), the NH3 production rate of NO3−RR is still well below the industrial Haber–Bosch route due to the lack of robust electrocatalysts for yielding high current densities with concurrently good suppression of hydrogen evolution reaction (HER). Herein, we describe an in situ electrochemical strategy for the synthesis of hollow carbon-coated Cu nanoparticles (NPs) (HSCu@C) with abundant grain boundaries (HSCu-AGB@C) for highly efficient NO3−RR in both alkaline and neutral media. Impressively, in alkaline media, the HSCu-AGB@C can achieve a maximum NH3 Faradaic efficiency of 94.2% with an ultrahigh NH3 rate of 487.8 mmol g−1cat h−1 at −0.2 V versus a reversible hydrogen electrode, more than 2.4-fold of the rate obtained in the Haber–Bosch. Both theoretic computations and experimental results uncover that the grain boundaries play the key to improve the NO3−RR performance. Herein, the industrial-scale NH3 production rate may open exciting opportunities for the practical electrosynthesis NH3 under ambient conditions. © 2022 CCS Chemistry. All rights reserved.

Published
2022

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