JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Tao Yang,Guojian Cao,Qingli Huang,Yanxia Ma,Sheng Wan,Hong Zhao,Na Li,Fujun Yin,Xia Sun,Dongen Zhang,Mingyan Wang
In present work, truncated octahedral Pt–Ni–Ir ternary nanoparticles with an average size of 10 nm and a Pt/Ni/Ir atomic ratio of 55/29/16 are synthesized through a facile method. Structural measurements show that the nanoparticles are surface Ni-scarce Pt–Ni–Ir ternary nanostructures . The mass activity and specific activity of the ternary catalyst are 511 mA mg −1 (Pt) and 1.03 mA cm −2 at 0.9 V (vs. reversible hydrogen electrode , RHE), respectively, which are nearly 4.8 and 6.0 times larger than that of the commercial Pt/C catalyst (106 mA mg −1 and 0.17 mA cm −2 ). After duration test of 10,000 cycles at the potential range from 0.6 to 1.0 V, the ternary catalyst preserved 66% and 73% of its initial mass activity and specific activity, respectively, which are 9 and 7.6 times that of the commercial Pt/C catalyst (37.2 mA mg −1 and 0.0998 mA cm −2 , respectively) after the same durability examination. The dramatic enhancement of Pt–Ni–Ir ternary catalyst can be attributed to its morphology, composition and nanostructure. Our research suggests that Pt–Ni–Ir ternary catalyst could be an excellent candidate for ORR . Our investigation might also spur increasing attention to tailoring morphology and composition of ternary or multi-metallic nanostructure with high electro-catalytic performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Yu Chen,Zemin Zhao,Ze Li,Jieying Jing,Wenying Li
Hydrogenation saturation of phenanthrene was an effective method to acquire high energy density fuels. It is essential to design highly active and stable hydrogenation saturated catalyst to realize the above reaction. Herein, series of Ni-Co/NiAlOx catalysts were synthesized by reducing at different temperatures. Activity evaluation showed that the catalysts reduced at 560 °C (Cat-560) possessed a phenanthrene conversion amount of 8.0 mmol·g -1 active component·h −1 and 98% perhydrophenanthrene selectivity after running 6 h under 300 °C, 5 MPa. Furthermore, it was found that Cat-560 presented superior specific activity (4.3 mmol·kg −1 ·s −1 ) and TOF (41.1 × 10 −3 s −1 ) for symmetric octahydrophenanthrene hydrogenation (the rate determining reaction), and its specific activity was 3 times as high as that of the catalysts reduced at 520 °C The excellent hydrogenation performance of Cat-560 could be attributed to its special geometric and electronic structure. Characterization indicated that the Ni 2+ in Ni-Co/NiAlO X catalyst was mainly located in the nickel aluminum spinel octahedral sites, which was beneficial to the reduction of Ni and the formation of smaller Ni particles. Moreover, it was explored that the Ni d charge density of Cat-560 catalyst was −0.12 e, which was suitable for the adsorption and activation of phenanthrene and symmetric octahydrophenanthrene.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Tingting Liu,Bomin Feng,Xiuju Wu,Yanli Niu,Weihua Hu,Chang Ming Li
It is desirable yet challenging to develop highly active and durable hydrogen evolution reaction (HER) electrocatalysts with Pt-comparable activity for future energy devices. In this work, we report Ru2P nanoparticle decorated P/N dual-doped carbon nanofibers on carbon cloth (Ru2P@PNC/CC-900) as a highly efficient and durable hierarchical HER electrocatalyst in both acidic and alkaline media. Electrochemical tests show that this Ru2P@PNC/CC-900 possesses Pt-comparable HER activity to support 10 mA cm–2 HER current density at low overpotential of 15 and 50 mV in acidic and alkaline condition, respectively. Density functional theory calculations reveal that coupling Ru2P nanoparticles with heteroatom-doped carbon fibers leads to enhanced intrinsic HER activity. The integrative hierarchical architecture further endows high surface areas with good mechanical robustness to support abundant catalytically active sites and possesses excellent electrical conductivity and efficient access for mass transportation to facilitate the HER process.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
ENZYME AND MICROBIAL TECHNOLOGY
·
2025
·
IF 3.7
Xiaotong Kang,Hang Yuan,Weimeng Li,Yun Hu,Fubao Sun
Thermophilic endoglucanases are of big promise in enzymatic degradation of lignocellulosic substrate, yet their limited catalytic efficiency remains a major barrier to industrial application. This study focused on the improvement of activity and stability of thermostable endoglucanase Dt CelA from Dictyoglomus turgidum with a three-stage cascade engineering strategy that integrated model-guided site-directed mutagenesis, disulfide bond introduction, and carbohydrate-binding module (CBM) fusion. Among the variants, the triple mutant S25D/T265C/A305C fused with CBM2 (S25D/T265C/A305C-A-CBM2) exhibited a 90.56 % increase in specific activity toward CMC relative to the wild type, together with a 2.97-fold longer half-life at 75 °C and a 5.3-fold longer at 80 °C. This mutant also displayed 3.0- and 5.4-fold higher hydrolytic activity against Avicel and konjac glucomannan, respectively. On natural lignocellulosic substrates including filter paper, sugarcane bagasse, and corn stover, the mutant also showed potential application. The mutated endoglucanase Dt CelA was powerful with enhanced catalytic performance and thermostability after multicascade engineering, which can provide a robust framework for the rational design of cellulases that are optimized for high-temperature biorefinery process.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shuqi Hu,Zi-An Li
To further promote the widespread commercialization of proton exchange membrane fuel cells (PEMFCs), high performance oxygen reduction reaction (ORR) catalysts with high activity and stability must be developed to accelerate its sluggish kinetic process. Here, we report a successful synthesis of a novel hybrid material - highly synergistic PtCo nanoparticles (NPs) attached to three-dimensional graphene (PtCo @3DG). The PtCo @3DG exhibits excellent ORR performance, and the mass activity and specific activity measured at 0.9 V vs. RHE were 0.801 A/mg Pt and 1.250 mA/cm 2 respectively, which are 6.8 and 6.2 times higher than commercial Pt/C. High stability of this new material is achieved, which has demonstrated a loss of only 1.87% after an extensive 10,000 cycles test. The superior performance of PtCo @3DG can be primarily attributed to several key features, including its ultrathin size, a high Pt utilization, and a beneficial alloy effect. Additionally, the 3D graphene possesses an open and interconnected porous structure that facilitates efficient charge and mass transfer, which accelerates the desorption process of intermediates and exposes more active sites.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Qiangqiang Xue,Zhengwen Li,Binhang Yan,Shafqat Ullah,Yujun Wang,Guangsheng Luo
A novel mesoporous SiO 2 encapsulated core-shell NiRh@NiO nanostructure was constructed to enhance the activity and stability of ethanol steam reforming (ESR). At 550 °C and ethanol-WHSV = 21 h −1 , the specific activity and conversion loss (17 h) of NiRh@NiO@m-SiO 2 were 0.42 mol ethanol /(g cat. ·h) and 10.9 %. The alloying of NiRh core, dominated NiO in shell, and abundant mesopore of SiO 2 were confirmed by systematic characterization techniques. The in situ DRIFTS results indicated that alloying Ni and Rh boosted ethoxide dehydrogenation to acetaldehyde and acetate demethanation to carbonate. ReaxFF molecular dynamics (MD) simulations suggested that NiO shell was conducive to water activation, which, in turn, promoted the conversion of CH x O y species. The SiO 2 encapsulation derived confinement effect inhibited both metal core sintering and leaching caused by the filamentous carbon. The abundant mesopores of SiO 2 ensured the facile in-diffusion of water and out-diffusion of carbonaceous products, suppressing carbon deposition within the SiO 2 encapsulation and the destruction of core-shell structure.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 7
·2101944
·
IF 6.389
Qianli Xing,Wei Yan,Chuangyu Wei,Zuoxu Xiao,Zhicheng Jin,Xue Liu,Jianwei Ren,Yanli Chen,Xiyou Li
The multidimensional PtZn quasi-cubic nanodendrites (PtZn-ND) with tremendous amounts of defectively coarse branches, having both highly active high-index facets and short-range (100) and (110) terraces resisted to sulfate, are synthesized via facile oil phase route at first time. The growth process is found to start from Pt nano-cuboid seeds, then PtZn nanoclovers which are formed from epitaxial growth, and then the flower-like PtZn crystals and finally the novel PtZn-ND. The formation mechanism of PtZn-ND, in particular the effects of hexadecyltrimethyammonium bromide (CTAB) and oleic acid (OA) on the morphology, crystal shape and exposure lattice facets, have been comparatively and systematically studied. And it turns out that CTAB mainly controls depositing directions, while OA mainly controls the crystal shape/size. The combination effect results in unique PtZn-ND structures. The novel PtZn-ND also displays superior catalytic performance and anti-sulfate poisoning ability. In particular, the mass activity (MA) and specific activity (SA) are 5.72 and 7.55 times higher than those of commercial Pt/C, and still 2.91 and 5.09 times higher after accelerated durability tests in 0.5 m H 2 SO 4 for oxygen reduction reaction.
研究领域:
材料科学
·
纳米技术
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Qian Ningkang,Ji Liang,Li Xiao,Huang Jingbo,Li Junjie,Wu Xingqiao,Yang Deren,Zhang Hui
Combining the core-shell structure with the optimization of surface composition and structure in the shell is a fantastic strategy to enhance the electrocatalytic performances. Here, we synthesized trimetallic Au@PtxSny core-shell nanoparticles (NPs) with tunable composition and structure of Pt-Sn alloyed shells. Impressively, the Au@PtSn core-shell NPs with hexagonal PtSn alloyed shells exhibited the highest mass activity and specific activity toward ethanol oxidation reaction (EOR) in alkaline electrolyte, which are 13.0 and 12.7 times higher than those of the commercial Pt/C. In addition, the Au@PtSn core-shell NPs displayed the best stability compared to commercial Pt/C, with only 44.8% loss vs. 86.8% loss in mass activity after 1,000 s due to the stronger anti-poisoning ability for reaction intermediates. The theory calculations reveal that the introduction of Au core and alloying Pt with Sn both endow Pt with an appropriate d-band center, and thus effectively boosting the EOR activity.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Physics
·
2023
·
IF 11.5
Hongjie Yu,Shaojian Jiang,Wenjie Zhan,Kai Deng,Ziqiang Wang,You Xu,Hongjing Wang,Liang Wang
The direct formate fuel cells (DFFCs) are energy conversion devices that use formate as fuel. However, CO ads generated from formate dehydration accumulate on the Pd surface and cause catalyst poisoning and deactivation. Here, we constructed a hydrogen intercalated palladium-copper metallene (PdCuH metallene) to enhance the anti-CO poisoning ability. For formate oxidation , the mass and specific activities of PdCuH metallene/C were 3.4 and 3.2 times those of Pd/C. While in ORR , the mass and specific activities of PdCuH metallene reached 12.4 and 13.9 times that of Pt/C. When we assembled PdCuH metallene/C as an electrode material for DFFC, the peak power and limiting current density of PdCuH metallene/C || PdCuH metallene/C were 79.5% and 159.7% higher than that of Pt/C || Pd/C, respectively. This study provides a new resolution to address the CO poisoning deactivation of direct formate fuel cell catalysts.
研究领域:
材料科学
·
能量转换
·
电化学
·
燃料电池
✓ 已验证
产品关联
DOI
高影响因子
Interdisciplinary Materials
·
2024
·
IF 24.5
Mingwei Wang,Zhiyi Hu,Jieheng Lv,Zhiwen Yin,Zhewei Xu,Jingfeng Liu,Shihao Feng,Xiaoqian Wang,Jiazhen He,Sicheng Luo,Dafu Zhao,Hang Li,Xuemin Luo,Qi Liu,Damin Liu,Baolian Su,Dongyuan Zhao,Yong Liu
Compositions and morphologies of Pt-based electrocatalysts have great impact on the electrocatalytic activity and stability of oxygen reduction reaction (ORR). Herein, we report a novel design of one-dimensional (1D) Pt–Pd dendritic nanotubular heterostructures (DTHs) by controlling the degree of Pt 2+ -Pt reduction reaction and Pd-Pt galvanic replacement reaction with uniform Pd nanowires as sacrificial templates. The obtained Pt–Pd bimetallic DTHs catalyst exhibited uniform and dense Pt dendritic nanobranches on the surface of 1D hollow Pt–Pd alloy nanotubes, possessing superior catalytic activity for ORR compared to state-of-the-art commercial Pt/C catalysts. Typically, the Pt 4 Pd DTHs catalyst showed efficient mass activity (MA, 1.05 A mg Pt −1 ) and specific activity (SA, 1.25 mA cm Pt −2 ) at 0.9 V (vs. RHE), and the catalyst exhibited high stability with 90.4% MA retention after 20 000 potential cycles. The Pt–Pd bimetallic DTHs configuration combines the advantages of 1D hollow nanostructures and dense Pt dendritic nanobranches, which results in rich electrochemical active surface sites, fast charge transport, and multiple dendritic anchoring points contact on carbon support, thus boosting its catalytic activity and stability towards electrocatalysis.
研究领域:
材料科学
·
电化学
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2022
·Vol. 13
·期 1
·2202913
·
IF 29.698
Dan-Qing Liu,Zhouxin Luo,Bingxing Zhang,Guoqiang Zhao,Wei Guo,Jian Chen,Mingxia Gao,Yongfeng Liu,Hongge Pan,Wenping Sun
The sluggish kinetics of hydrogen oxidation reaction (HOR) is one of the critical challenges for anion exchange membrane fuel cells. Here, we report epitaxial growth of Ir nanoclusters (<2 nm) on a MoS 2 surface (Ir/MoS 2 ) and optimize the alkaline HOR activity via tailoring interfacial charge transfer between Ir clusters and MoS 2 . The electron transfer from MoS 2 to Ir clusters can effectively prevent the oxidation of Ir clusters, which is not the case for carbon-supported Ir nanoclusters (Ir/C) synthesized using the same method. Moreover, the HOR performance of the Ir/MoS 2 can be further optimized by tuning the hydrogen binding energy (HBE) via a precise annealing treatment. A substantial exchange current density of 1.28 mA cm ECSA −2 is achieved in the alkaline medium, which is ∼10 times over that of Ir/C. The HOR mass-specific activity of Ir/MoS 2 heterostructure is as high as 182 mA mg Ir −1 . The experimental results and density functional theory calculations reveal that the significant improved HOR activity is attributed to the decreased HBE, which highlights epitaxial growth is an effective way for boosting catalytic activity of heterostructured catalysts.
研究领域:
材料科学
·
电化学
·
催化
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Sijie Gao,Shuozhen Hu,Guoming Luo,Shigang Sun,Xinsheng Zhang
Doping nitrogen (N) into the carbon support was widely applied to enhance the performance of Pd toward formic acid electro-oxidation (FAO). However, traditional nitrogen doping methods can only introduce a low content of nitrogen as well as a two-step complicated procedure to synthesize catalysts. In this study, a facile one-pot strategy is demonstrated to prepare N-doped carbon encapsulated palladium nanoparticles (Pd@N x C) via the pyrolysis of 2,2′-bipyridine palladium (II) complexes. A N-doped carbon layer with the thickness of about 4 nm is in-situ generated over Pd nanoparticles by only one pyrolysis procedure. Both XPS and in-situ XRD results suggest that metallic Pd is reduced from Pd 2+ by the complexed N in bipyridine during the pyrolysis at high temperature. The physical characterizations prove that the in-situ formation of N-doped carbon shell can not only effectively prevent the agglomeration or dissolution of Pd nanoparticles, but also promote the charge donation from the carbon layer to Pd, and maintain the structure of Pd atom complexed to two pyridinic-N atoms (Pd-N). This in-situ synthesis strategy can be successfully applied to carbon supports with different geometry, such as reduced graphene oxide and Vulcan XC-72. Pd@N 3 C/rGO, which contains the highest amount of N (7.39 at.%) and Pd-N (33.15%), shows the highest specific activity (5.88 mA cm −2 ) and excellent durability toward FAO.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）