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138 results on '"Hou, Chun-Chao"'

7. A Multifunctional Solar‐Driven Formic Acid Decomposition System Using Bimetallic Phosphides/CdS as Catalysts to Obtain H2, CO, or Syngas.

Author

Zhou, Jun, Li, Qin‐Zhu, Li, Jin‐Rong, Sun, Tong, Cao, Shuang, Chen, Yong, and Hou, Chun‐Chao

Subjects
HYBRID systems, CARBON monoxide, FORMIC acid, VISIBLE spectra, SYNTHESIS gas, IRRADIATION
Abstract

A simple hybrid system is constructed using CdS as photocatalyst and transition metal phosphides as cocatalysts for selectively photocatalytic formic acid decomposition under visible light irradiation at room temperature. By adjusting FA decomposition conditions, different products of H2, CO, or syngas can be obtained according to different demands. With the assistance of bimetallic phosphides as cocatalysts, the H2 and CO production efficiencies can reach up to 138.3 and 116.1 μmol mg−1 h−1 at pH = 1.5 and 9.2, respectively. At pH = 4.4, the syngas efficiency can reach up to 306.9 μmol mg−1 h−1, including 101.4 μmol mg−1 h−1 H2 and 205.5 μmol mg−1 h−1 CO. Moreover, the present heterogeneous system also exhibits excellent photocatalytic stability and still keeps high rates after the five‐cycle reaction, indicating its potential application value. [ABSTRACT FROM AUTHOR]

Published
2024
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13. The Recent Progress of Oxygen Reduction Electrocatalysts Used at Fuel Cell Level.

Author

Li, Jin‐Rong, Liu, Ming‐Xu, Liu, Xia, Yu, Xiang‐Hui, Li, Qin‐Zhu, Sun, Qi, Sun, Tong, Cao, Shuang, and Hou, Chun‐Chao

Abstract

Proton exchange membrane fuel cells (PEMFCs) are gaining significant interest as an attractive substitute for traditional fuel cells, with higher energy density, lower environmental pollution, and better operation efficiency. However, the cathode reaction, i.e., the oxygen reduction reaction (ORR), is widely proved to be inefficient, and therefore an obstacle to the widespread development of PEMFCs. The requirement for affordable highly‐efficient ORR catalysts is extremely urgent to be met, especially at fuel cell level. Unfortunately, most previous reports focus on the ORR performance at rotating disk electrodes (RDE) level instead of membrane electrode assembly (MEA) level, making it harder to evaluate ORR catalysts operating under real vehicle conditions. Obviously, it is extremely necessary to develop an in‐depth understanding of the structure‐activity relationship of highly‐efficient ORR catalysts applied at MEA level. In this work, an overview of the latest advances in ORR catalysts is provided with an emphasis on their performance at MEA level, hoping to cover the novel and systemic insights for innovative and efficient ORR catalyst design and applications in PEMFCs. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Enhancing electrostatic interactions to activate polar molecules: ammonia borane methanolysis on a Cu/CoIJOH)2 nanohybrid

Author

Chen, Qian-Qian, Li, Qiang, Hou, Chun-Chao, Wang, Chuan-Jun, Peng, Cheng-Yun, López, Núria, and Chen, Yong

Abstract

Optimization of metal–support interactions (MSIs) is at the core of heterogeneous catalyst design. For polar reactants, electrostatic interactions resulting from MSIs can facilitate their activation. In this work, a feasible in situ method has been employed to control the electrostatic properties at the interface of a noblemetal- free Cu/CoIJOH)2 nanohybrid catalyst. On the Cu/CoIJOH)2 interface, the positively charged copper enhances the polar molecule adsorption. By varying the metal/support ratio, a highly efficient catalytic activity for the methanolysis of ammonia borane (AB) with an initial turnover frequency (TOF) of 61.63 mol(H2) mol(catalyst) −1 min−1 and long-term stability at ambient temperature were observed. Theoretical analysis unravels the role of charge transfer in promoting the reactions and the metal/support ratio in manipulating the catalytic activity via tuning electrostatic interactions.

Published
2019

30. A Multifunctional Solar‐Driven Formic Acid Decomposition System Using Bimetallic Phosphides/CdS as Catalysts to Obtain H2, CO, or Syngas

Author

Zhou, Jun, Li, Qin‐Zhu, Li, Jin‐Rong, Sun, Tong, Cao, Shuang, Chen, Yong, and Hou, Chun‐Chao

Abstract

A simple hybrid system is constructed using CdS as photocatalyst and transition metal phosphides as cocatalysts for selectively photocatalytic formic acid decomposition under visible light irradiation at room temperature. By adjusting FA decomposition conditions, different products of H2, CO, or syngas can be obtained according to different demands. With the assistance of bimetallic phosphides as cocatalysts, the H2and CO production efficiencies can reach up to 138.3 and 116.1 μmol mg−1h−1at pH = 1.5 and 9.2, respectively. At pH = 4.4, the syngas efficiency can reach up to 306.9 μmol mg−1h−1, including 101.4 μmol mg−1h−1H2and 205.5 μmol mg−1h−1CO. Moreover, the present heterogeneous system also exhibits excellent photocatalytic stability and still keeps high rates after the five‐cycle reaction, indicating its potential application value. A robust hybrid photocatalyst for formic acid decomposition is constructed by simply grinding CdS and transition metal phosphides. By adjusting FA decomposition conditions, different products of H2, CO, or syngas can be obtained according to different demands and the related photocatalytic performances surpass most of the reported works.

Published
2024
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36. Ternary Ni–Co–P nanoparticles as noble-metal-free catalysts to boost the hydrolytic dehydrogenation of ammonia-borane†

Author

Hou, Chun-Chao, Li, Qiang, Wang, Chuan-Jun, Peng, Cheng-Yun, Chen, Qian-Qian, Ye, Hui-Fang, Che, Chi-Ming, López, Núria, and Chen, Yong

Subjects
inorganic chemicals
Abstract

The development of high-efficiency and low-cost catalysts for hydrogen release from chemical hydrogen-storage materials is essential for the hydrogen-economy paradigm. Herein, we report a facile and controllable method to fabricate a series of Co-doped nickel phosphides and their corresponding nanohybrids with graphene oxide (GO) as highly efficient, robust and noble-metal-free catalysts for ammonia borane hydrolysis. The incorporation of Co into Ni2P effectively optimizes the electronic structures of Ni2!xCoxP catalysts to enhance their interaction with AB and simultaneously facilitate the hydroxyl activation of AB, resulting in the reduction of the reaction energy barrier and thus substantial improvement of the catalytic rate.

Published
2017

44. Inlay of ultrafine Ru nanoparticles into a self-supported Ni(OH)2 nanoarray for hydrogen evolution with low overpotential and enhanced kinetics.

Author

Chen, Qian-Qian, Yang, Xiao, Hou, Chun-Chao, Li, Kai, and Chen, Yong

Abstract

Electrocatalytic water splitting plays a vital role in the hydrogen fuel industry, but suffers from the lack of efficient non-platinum (Pt) hydrogen evolution reaction (HER) catalysts. Metallic Ru has proven to be one of the promising candidates for the HER. However, the syntheses of Ru nanoparticles in previous reports require harsh reaction conditions such as high temperature or very strong external reductants. Herein, we report an extremely simple and mild method to prepare ultra-small Ru nanoparticles in situ inlaid into a Ni(OH)2 nanoarray grown on Ni foam (Ru/Ni(OH)2/NF) through the “spontaneous oxidation-reduction reaction” strategy. In 1.0 M KOH, this self-supported material displays a high HER activity with an overpotential as low as 25 mV to deliver a current density of 10 mA cm−2, as well as a low Tafel slope of 47 mV dec−1. When assembled in a device for overall water splitting, it achieves a current density of 10 mA cm−2 at 1.50 V and shows outstanding long-term stability even at 50 mA cm−2. The present work provides a facile and green strategy to prepare non-Pt HER electrocatalysts and it can be applied to the development of new photo-and electrocatalysts. [ABSTRACT FROM AUTHOR]

Published
2019
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48. Ir4+-Doped NiFe LDH to expedite hydrogen evolution kinetics as a Pt-like electrocatalyst for water splitting.

Author

Chen, Qian-Qian, Hou, Chun-Chao, Wang, Chuan-Jun, Yang, Xiao, Shi, Rui, and Chen, Yong

Subjects
*NICKEL alloys, *DOPING agents (Chemistry), *HYDROGEN evolution reaction kinetics, *ELECTROCATALYSTS, *LAYERED double hydroxides
Abstract

NiFe-layered double hydroxide (NiFe LDH) is a state-of-the-art oxygen evolution reaction (OER) electrocatalyst, yet it suffers from rather poor catalytic activity for the hydrogen evolution reaction (HER) due to its extremely sluggish water dissociation kinetics, severely restricting its application in overall water splitting. Herein, we report a novel strategy to expedite the HER kinetics of NiFe LDH by an Ir4+-doping strategy to accelerate the water dissociation process (Volmer step), and thus this catalyst exhibits superior and robust catalytic activity for finally oriented overall water splitting in 1 M KOH requiring only a low initial voltage of 1.41 V delivering at 20 mA cm−2 for more than 50 h. [ABSTRACT FROM AUTHOR]

Published
2018
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49. Enhancing electrostatic interactions to activate polar molecules: ammonia borane methanolysis on a Cu/Co(OH)2nanohybridElectronic supplementary information (ESI) available. See DOI: 10.1039/c9cy00584f

Author

ChenQian-Qian Chen, Qian-Qian, work., Qiang Li contributed equally to this, Li, Qiang, Hou, Chun-Chao, Wang, Chuan-Jun, Peng, Cheng-Yun, López, Núria, and Chen, Yong

Abstract

Optimization of metal–support interactions (MSIs) is at the core of heterogeneous catalyst design. For polar reactants, electrostatic interactions resulting from MSIs can facilitate their activation. In this work, a feasible in situmethod has been employed to control the electrostatic properties at the interface of a noble-metal-free Cu/Co(OH)2nanohybrid catalyst. On the Cu/Co(OH)2interface, the positively charged copper enhances the polar molecule adsorption. By varying the metal/support ratio, a highly efficient catalytic activity for the methanolysis of ammonia borane (AB) with an initial turnover frequency (TOF) of 61.63 mol(H2)mol(catalyst)−1min−1and long-term stability at ambient temperature were observed. Theoretical analysis unravels the role of charge transfer in promoting the reactions and the metal/support ratio in manipulating the catalytic activity viatuning electrostatic interactions.

Published
2019
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