CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Yu-Shuai Xu,Hong-Hui Wang,Qi-Yuan Li,Shi-Nan Zhang,Si-Yuan Xia,Dong Xu,Wei-Wei Lei,Jie-Sheng Chen,Xin-Hao Li
The development of two-dimensional heterogeneous catalysts with highly exposed active site areas for heterogeneous catalytic systems is highly promising for achieving the green transformation of small molecules. 2D transition metal carbides (TMCs) show great promise for catalysis and carbon capture but suffer from heavy aggregation and autooxidation. Mass transfer barrier is also a standard problem of lamellar TMCs caused by slight aggregation of layers. Here, we successfully developed a method to prepare “ladder-like” heterojunctions of Mo 2 C layers confined inside nitrogen-rich carbon sheaths (2D-Mo 2 C@NC) via an effective oxygen-diffusion etching strategy, acting as efficient catalysts for CO 2 fixation. The enhanced electron enrichment of the as-integrated 2D-Mo 2 C subunits induced by the Schottky barrier could further keep the exposed Mo 2 C surface from possible autooxidation and aggregation confronted by conventional 2D TMCs. The experimental results and density functional theory (DFT) calculation further demonstrate that electron-rich Mo 2 C could boost the adsorption and activation of CO 2 for universal carbonylation of various diamines, providing a turnover frequency value (TOF) of 10.2 h −1 to produce benzimidazolone, which is 5.2 times of that of the state-of-the-art catalyst in the literature under even critical conditions.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Jihua Huang,Jinyuan Liu,Jia Yan,Chengjuan Wang,Ting Fei,Haiyan Ji,Yanhua Song,Cheng Ding,Chengbao Liu,Hui Xu,Huaming Li
Deposition of metal nanoparticles into pore could be regarded as promising strategy for promoting photocatalytic performance because it could enrich active species in limited space. Here, we deposited typical metal cocatalysts (Pt, Ag, Ni) within the pore of mesoporous graphitic carbon nitride (MPCN) via multiple vacuum-induced method. Through a series of characterization analysis of the obtained M (M = Pt, Ag, Ni)/MPCN composites, it could be confirmed that the metal nanoparticles successfully entered into the pore of MPCN . Further exploring the photocatalytic activity, the results indicate that the electrons enrichment-effect composites exhibits higher hydrogen production than physical blending composites, which is attributed to the metal nanoparticles grown and dispersed evenly within the confined mesoporous space, promoting effectively enrichment of photogenerated electron and improving the photocatalytic performance. Thereby, to investigate the metal nanoparticles deposited within the confined pore of MPCN for improving the photocatalytic performance is necessary.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jingwen Ma,Juan Wang,Jian Liu,Xiang Li,Yuanqing Sun,Ruiying Li
The development of a low-cost and high-stability catalyst with Platinum-like electrocatalytic performance is significant for the hydrogen evolution reaction (HER) from water electrolysis. Herein, ultrafine ruthenium nanoparticles encapsulated in Nitrogen(N)-doped carbon anchored on graphene sheets are fabricated and utilized as HER electrocatalysts. Characterization results verify that the strong interaction between the N -doped carbon shell and the Ru core leads to charge redistributions, promoting Ru in a more active electron-rich state. Therefore, the catalyst exhibits excellent activity over a wide pH range, which only needs 16, 23 and 72 mV to drive a current density of 10 mA cm −2 in alkaline, acidic and neutral electrolytes, respectively. In addition, the N -doped carbon shell protects the Ru nanoparticles from aggregation and decomposition in the extreme electrolyte, contributing to the excellent stability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Qingyuan Dong,Bo Hong,Hailin Fan,Chunhui Gao,Shu Hong,Yanqing Lai
The Li metal anode has been regarded as the ultimate anode because of high theoretical capacity and low potential. Unfortunately, dendrite growth and safety issues impede its practical applications. Herein, we report a series of electron-rich functional groups, such as nitrogen, oxygen and phosphorus, doped Ketjen Black (ECP) as a lithium deposition/dissolution host. The electron-rich functional groups can effectively improve the wettability and lithiophility of the carbon host, which is benefit to induce homogeneous lithium deposition in the Ketjen Black (ECP), rendering significant inhibition of dendrite growth and effective improvement of electrochemical stability. Under the roles of these factors, the nitrogen doped Ketjen Black (ECP) electrode achieves a high Coulombic efficiency of 97.8% over 300 cycles at 1.0 mA cm −2 , while the pristine ECP electrode only maintains 110 cycles. What's more the O-doped ECP and P-ECP electrode also keeps longer cycles than the pristine ECP electrode.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zining Zhou,Meng Wei,Guangxing Yang,Wengbo Du,Feng Peng,Yueping Fang,Yingju Liu,Shengsen Zhang,Rongliang Qiu
Catalytic conversion efficiency from aqueous formaldehyde (HCHO) into hydrogen (H 2 ) on non-noble metal catalysts is much lower than that on noble metal catalysts. Modulating the electronic properties of non-noble metal-based catalysts has been demonstrated an effective approach to improve their catalytic performance. In this work, assisted by light irradiation, photoinduced electron-rich surface structure was designed for the thermal catalytic conversion of HCHO to H 2 . In detail, a heterostructure of CuNi@C composited with TiO 2 was obtained, in which TiO 2 can be photoexcited under light irradiation to provide photoinduced electrons onto the surface of CuNi@C. On the photoinduced electron-rich surface of the CuNi@C/TiO 2 heterostructure, the H 2 evolution rate reached 254.65 mmol h −1 g −1 , which was 1.88 times higher than that on CuNi@C. It is worth noting that the catalytic HCHO conversion efficiency outperforms the current reported non-noble metal catalysts for this reaction. Combining with density functional theory (DFT) calculations and experimental studies, it is concluded that the electron-rich CuNi@C dramatically reduced the activation energies of the dissociation of HCHO and H 2 O and accelerated the overall reaction rate.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanotechnology Reviews
·
2021
·Vol. 10
·期 1
·847-856
·
IF 7.848
Xiaowen Su,Zehua Wang,Yuan Huang,Zhenyu Miao,Shuhua Wang,Jianjun Wang,Xiao Li Zhang,Xiaomin Sun,Hong Liu,Yuanhua Sang
The hazard-free treatment of Cr( vi ) ions is critical in modern industry. Photocatalytic reduction and detoxification are high-potential strategies. Photocatalysts with high efficiency, low cost, environmental friendliness, and easy mass products are required. In this study, we report a facile strategy using triethanolamine (TEOA) as a capping ligand to modify the surface of ZnO nanospheres. The experimental and theoretical results reveal that the presence of TEOA on the surface was beneficial for electron enrichment on Zn and hole transfer to TEOA and can photocatalytically reduce Cr( vi ) by almost 100% in 5 min. The photocatalytic property of TEOA-modified ZnO could be renewed by the reabsorption of TEOA in solution. The great sedimental properties benefit photocatalyst recycling and renewal, which also provides high potential for water pollution and environmental emergency responses applications.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）