APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yang Huang,Xuening Song,Jun Deng,Chenyang Zha,Wenjing Huang,Yunling Wu,Yanguang Li
Transition metal phosphides are arguably the most promising non-precious metal-based materials for hydrogen evolution reaction (HER). Unfortunately, their high preparation temperature usually results in particle sintering. It is challenging to achieve the ultra-dispersion of transition metal phosphide nanoparticles on conductive supports so as to enlarge their surface areas and reinforce their physical stability. In this study, we prepare fine MoP nanoparticles uniformly dispersed on hierarchical carbonaceous scaffolds by using strongly interacting Mo, P and C precursors. The resultant hybrid product possesses a three-dimensional open structure that allows a large fraction of MoP nanoparticles electrochemically accessible and suppresses their possible agglomeration during extended electrocatalysis. Electrochemical measurements show that the product has an impressive HER activity, only requiring an overpotential of 120 and 170 mV to achieve 10 mA/cm 2 in 0.5 M H 2 SO 4 and 1M KOH, respectively, as well as great cycling stability. Its performance can be further promoted via the controlled sulfur doping at surface to form molybdenum phosphosulfide, which reduces the overpotential at j = 10 mA/cm 2 to 92 mV and 158 mV for acidic and alkaline HER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Fangqi Yang,Chang Jiang,Mingfeng Ma,Fenghao Shu,Xinyu Mao,Weikang Yu,Jun Wang,Zheling Zeng,Shuguang Deng
Electrochemical reduction of CO 2 into formic acid (HCOOH) is an appealing approach to mitigate the CO 2 emission problem and achieve a carbon-neutral cycle but remains a challenge. Herein, we present a novel strategy to prepare Cu nanoparticles embedded in carbon substrate (Cu NPs@C) as efficient CO 2 reduction reaction electrocatalysts for highly selective HCOOH production. The uniformly distributed Cu nanoparticles are responsible for the high faradaic efficiency of HCOOH of 78% at −1.0 V (RHE) and yield of 82.8 μmol h −1 cm −2 at −1.2 V (RHE). Moreover, the detailed density functional theory (DFT) calculations have demonstrated that the high activity and selectivity for HCOOH production was attributed to the synergy effects of exposed Cu (111) facets and carbon substrate. The charges transferred from Cu induces a charge-rich environment on the carbon surface, which enhances the *OCHO adsorption and boosts the HCOOH formation. This work paves a new way to synthesize novel Cu-based electrocatalysts for efficient production of HCOOH.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Pengfei Wang,Hui Liu,Yuxing Xu,Yunfa Chen,Jun Yang,Qiangqiang Tan
Reducing the particle size is a straightforward way to increase the specific surface area of ruthenium oxide, which usually translates to the high specific capacitance for a supercapacitor. Herein, we report a facile strategy to fabricate ultrafine ruthenium oxides supported on various carbon-based substrates (carbon powders, carbon nanotubes, or reduced graphene oxides) as excellent electrode materials for a supercapacitor. The novelty of this work lies in its synthetic approach, which involves an aqueous synthesis of ruthenium nanoclusters under the control of pH value, and an air oxidation-based conversion process. In particular, owing to their ultrafine particle size, the as-prepared carbon-, carbon nanotube-, or reduced graphene oxide-supported ruthenium oxides exhibit specific capacitance as high as 879.1 F g −1 , 966.8 F g −1 and 1099.6 F g −1 , respectively, for a supercapacitor at a current density of 0.5 A g −1 . The specific capacitance maintains 98.4% (for carbon supports), 98.0% (for carbon nanotube supports) and 98.4% (for reduced graphene oxide supports) at current density of 1 A g −1 with good cycling stability. The remarkable simplicity and environmental friendliness of this synthesis may provide a liable quantity production route to produce ruthenium oxides as highly efficient electrode materials for a supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Shifan Wu,Mengying Chen,Weiwen Wang,Jiabei Zhou,Xinru Tang,Dali Zhou,Can Liu
Developing economical and efficient electrocatalysts toward hydrogen evolution reaction (HER) plays a crucial role in promoting the utilization of hydrogen energy. Herein, a bottom-up strategy is exploited to synthesize ultrafine molybdenum carbide (Mo 2 C) nanocrystals assembling in boron, nitrogen co-doped carbon matrix (BNC). The BNC framework not only increases the dispersibility of carbide particles, but also provides additional active sites to intensify HER performance. Moreover, in comparison with mono-heteroatom modification, the catalyst decorating with B and N simultaneously is demonstrated to be a generalist which can efficaciously catalyze HER in both acidic and alkaline electrolyte. In-depth studies show that N-doping is conductive to capturing protons in acid while B-doping facilitates the adsorption and dissociation of water in alkali. This work may shed some light on the rational design and manufacture of HER electrocatalysts with high compatibility to distinct electrolytic environments.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Yiting Zheng,Ruichun Luo,Yuan Xu,Lei Zhang,Pan Liu,Qing Chen
Here, we demonstrate a general method of mediating the deposition of metal nanostructures on carbon substrates via reductive adsorbates. The adsorbates, quinone molecules, can achieve a well-defined surface coverage on a range of carbon substrates through one step of soaking. Upon electrochemical reduction, the adsorbates can function as surface-confined reductants to reduce metal cations for uniform anchorage of metal nanoparticles on carbon, which is not easily achievable via other electrochemical deposition. We apply the method to deposition of Ag and Pt and show the close correspondence between the coverage of the adsorbate and the amount of deposition as well as the dependence of the deposit structures on the quinone molecular structures. We further demonstrate the stability and the catalytic activity of the deposited Pt for catalyzing the hydrogen evolution reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2023
·
IF 5.2
Jian Shi,Ruiqian Li,Jingwei Li,Guicheng Liu
Improving the electrical conductivity and structural integrity of Si/C anodes is of great concern for lithium-ion batteries which can be effectively achieved by doping graphene. However, it is difficult to achieve graphene-doped Si/C composites with good interface contact and conductive architecture. Herein, an in-situ graphene-doped carbon coated silicon nanoparticles (SiNPs) with multilayer architecture is designed. SiNPs is firstly modified and coated by polymethyl methacrylate (PMMA) shell. Multilayer carbon architecture is constructed via co-pyrolysis method using PMMA and citric acid as carbon sources. It displays an excellent lithium storage performance with a reversible discharge capacity of 2117.5 mAhg −1 at 200 mAg −1 . These impressive anodic properties are chiefly benefited from the ingenious carbon architecture coated SiNPs involving in-situ graphene with a strong interfacial bonding interaction. Overall, this investigation can not only broaden the application potential in LIBs for advanced Si/C anodes but also provide an alternative route on designing a graphene-related material.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Liu Hui,Li Chengyin,Chen Dong,Cui Penglei,Ye Feng,Yang Jun
Alloying platinum (Pt) with suitable transition metals is effective way to enhance their catalytic performance for methanol oxidation reaction, and reduce their cost at mean time. Herein, we report our investigation on the synthesis of bimetallic platinum-cobalt (PtCo) alloy nanoparticles, their activation, as well as the catalytic evaluation for methanol oxidation reaction. The strategy starts with the synthesis of PtCo alloy nanoparticles in an organic medium, followed by loading on carbon substrates. We then remove the capping agent by refluxing the carbon-supported PtCo particles in acetic acid before electrochemical measurements. We emphasize the change in composition of the alloys during refluxing process, and the initial PtCo alloys with Pt/Co ratio of 1/2 turns into stable alloys with Pt/Co ratio of 3/1. The final Pt 3 Co particles have uniform distribution on carbon substrates, and exhibit activity with 2.4 and 1.5 times of that for commercial Pt/C and PtRu/C for methanol oxidation reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 6
·3455-3460
·
IF 3.108
Jiayi Tang,Dong Chen,Chengyin Li,Xianfeng Yang,Hui Liu,Jun Yang
Nanocomposites composed of silver sulfide (Ag2S) and platinum (Pt) metal are promising for electrocatalysis. However, they suffer from low concentration synthesis or larger sizes due to limitations in the current synthetic approaches. Herein, we report an organic synthesis to address these deficiencies for the preparation of Ag2S–Pt nanocomposites. This strategy starts with a dodecylamine (DDA)-based phase transfer of Ag+ ions from the aqueous phase to toluene. The transferred Ag+ ions are then loaded on the carbon substrates, followed by reaction with elemental sulfur to form carbon-supported Ag2S nanocrystals, which are used as seeds for the growth of a Pt metal shell, resulting in the formation of the Ag2S–Pt nanocomposites on the same carbon substrates. The as-prepared carbon-supported Ag2S–Pt nanocomposites have a core–shell construction with an overall fine size of ca. 5 nm. In comparison with the commercial Pt/C catalysts from Johnson Matthey, fine Ag2S–Pt nanocomposites supported on the carbon substrates exhibit a superior specific activity and durability for the methanol oxidation reaction under acidic conditions due to the strong electronic coupling effect between the Ag2S and Pt domains.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xuxu Wang,Ying Bai,Ruxiu He,Fen Yao,Limin Chang,Ping Nie
Metastable orthorhombic niobium pentoxide (T-Nb 2 O 5 ) with fast lithium storage capability and safe operating voltage is recognized as suitable anode material for high power density lithium-ion batteries (LIBs). While, the T-Nb 2 O 5 also suffers from low electrical conductivity in practical applications. In this work, the electrochemical performance of T-Nb 2 O 5 is enhanced by constructing a free-standing electrode and introducing the N-doped carbon substrate. The free-standing electrode consisting of the network-structured Nb 2 O 5 layer and porous carbon cloth (PCC) avoids the use of binders and benefits the electron transport. In addition, the introduction of N-doped carbon substrate is also beneficial to enhance the electronic conductivity of the Nb 2 O 5 . When used as the anode for LIBs , the PCC@Nb 2 O 5 demonstrates excellent long cycle life and rate performance, with a specific capacity of over 150 mA h g −1 after 3200 cycles at a current density of 1000 mA g −1 . This strategy of constructing free-standing electrodes provides new options for obtaining high-performance Nb 2 O 5 anode electrodes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Sainan Liu,Xinxiang Chen,Qiang Zhang,Jiang Zhou,Zhenyang Cai,Anqiang Pan
Coupling electrode materials with carbon substrates to construct flexible aqueous Zn-ion batteries (ZIBs) with excellent electrochemical performance is an attractive research focus. However, further improving the Zn2+/electron diffusion kinetics in such systems is still desirable. Herein, we present a novel hydrophilic carbon substrate that employs acid-treated natural halloysite and carbon nanotubes for the first time as structural and interfacial modifiers for loading V3S4 as a composite cathode (denoted as HCC-V3S4) for flexible ZIBs. The devices exhibit a high specific capacity of 148 mA h·g–1 under a current density of 0.5 A·g–1 (95% retention after 200 cycles), excellent rate performance, and a high energy density of 155.7 W h·kg–1, together with a high-power density of 5000 W·kg–1. The promising electrochemical property can be associated with the formation of the hydrophilic surface/interface and with the good conductivity of the composite electrode, which increases the Zn2+/electron transmission rate. Owing to the cost-effective design of the flexible substrate and the ZIB’s impressive electrochemical performance, the fabricated device shows good potential applications in portable and wearable electronics.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 11
·e202200191
·
IF 4.782
Yinglin Yan,Yuanyuan Yang,Chaojiang Fan,Yiming Zou,Qijiu Deng,Haidong Liu,Daniel Brandell,Rong Yang,Yunhua Xu
Graphical From waste to battery : Waste office paper was used to prepare a free-standing paper-based carbon (FPC) substrate, which was further modified with reduced graphene oxide (rGO) nanosheets (rGO@FPC) by a vacuum filtration method. After S impregnation, the rGO@FPC/S free-standing cathode was employed in Li−S batteries, which exhibited competitive cycling life and significant blocking action for polysulfide ions. Due to large sulfur (S) content and simple manufacturing techniques, free-standing cathodes for lithium-sulfur (Li−S) batteries are gaining a lot of attention recently. Waste office paper, which is consumed in large quantities annually, was used to make a free-standing paper-based carbon (FPC) substrate, which inherited fiber-like morphology. In addition, reduced graphene oxide (rGO) nanosheets modified FPC (rGO@FPC) host was also prepared by a vacuum filtration method. After S impregnation, the FPC/S and rGO@FPC/S free-standing cathodes were employed in Li−S batteries. The rGO@FPC/S free-standing cathode exhibited extremely competitive electrochemical performance, including a reversible discharge capacity of 315 mAh g −1 at 0.5 C after 500 cycles. This is due to the uniform S distribution, which boosts the utilization ratio, and the significant blocking action for polysulfide ions, which prevents the redox shuttle effect.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Zonglin Liu,Honglei Zhang,Dongyue Liu,Yujie Feng,Dechang Jia,Caicai Li,Qingfeng Sun,Yu Zhou,Zhenhui Kang,Baoqiang Li
The in-depth understanding of electrocatalysts is the key issue in the fields of clean energy and the chemical industry. Although various carbon-loaded active metal particle catalysts for the electrocatalytic hydrogen evolution reaction (HER) have been developed, the interaction between active metals and the substrate is still unclear. Herein, ruthenium (Ru) nanoparticles loaded on N-doped carbon dots (Ru/NCDs) were constructed to discover the critical roles of the carbon substrate as well as its interaction with Ru. Notably, we show the two critical functions of NCDs in a carbon-confined Ru system. First, the ultra-small Ru nanoparticles increase the hydrogen spillover channels. Second, the carbon substrate shows a Ru-like hydrogen adsorption capacity, supplying sufficient H sources for hydrogen spillover. Thus, the hydrogen spillover is enhanced and the HER process is accelerated. The Ru/NCDs catalyst shows superior HER activity and durability in both acidic and alkaline solutions. This work clarifies the critical role of carbon substrates in carbon-loaded catalysts.
研究领域:
电化学
·
催化
·
清洁能源
·
材料科学
✓ 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）