APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuan-Sheng Shen,Fang-Yuan Bai,Ke Wei,Xin-Ling Wang,Jun Chen,Ze-Yu Jiang,Jing Liu,Zhi-Yi Hu,Li-Hua Chen,Yu Li,Bao-Lian Su
The well-designed photocatalyst is a reasonable strategy to realize the photocatalytic H 2 -production and biomass conversion. In this work, the noble-metal-free Zn 0.1 Cd 0.9 S/NiS (SNS) composite was successfully prepared by in-situ chemical bath deposition of NiS nanoparticles on Zn 0.1 Cd 0.9 S (ZCS) nanorods surface for photocatalytic H 2 -production using glucose as electron donors for effective utilization of holes. Our results show that the synergistic effect of NiS and ZCS largely improves the absorption and utilization of light, and the photogenerated electrons transfer from NiS to ZCS to effectively separate the photogenerated carriers for the enhanced photocatalytic H 2 -production as the one-dimensional nanorods is conducive to the transmission of photogenerated carriers. The optimized catalyst (SNS20) has the highest H 2 production rate (12.77 mmol·g −1 ·h −1 ), which is 6.7 times that of pure ZCS nanorods. In particular, its apparent quantum efficiency (AQE) at 350 nm reaches 12.74%. The glucose conversion increases from 25.7% to 49.9% and lactic acid selectivity reaches 95%. During three cycles, the SNS20 shows the stable H 2 -production rate, which remains 12 mmol·g −1 ·h −1 after three cycles. And the glucose conversion still remains above 40%. This work provides a reasonable strategy for designing heterojunction photocatalyst to improve the performance for the synergy of photocatalytic H 2 -production and biomass conversion.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 23
·13818-13829
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IF 10.7
Wenrui Wu,Yue Yan,Xing Wang,Chengzhi Wei,Yang,Tao Xu,Xianfu Li
Transition metal selenides and sulfides have attracted much attention as supercapacitor electrode materials, and reasonable construction and modification strategies can effectively improve their actual energy storage capacity. Herein, a CuCoSe@NiS/NF electrode material was optimized from the two dimensions of the material structure and microstructure using a self-supported bimetallic CuCo-MOF template and surface modification. The in situ growth not only secures the structural integrity of the electrode material but also eliminates the unwanted internal resistance, thereby enhancing the material's conductivity. The distribution of different spaces of the nanosheets greatly increased the specific surface area of the material, which endowed it with sufficient electrochemical active sites, thus obtaining the desired electrochemical performance. The strong electronic interactions between the CuCoSe nanosheets and NiS sheet layers significantly increased the charge transport rate. Consequently, the specific capacitance of the prepared CuCoSe@NiS/NF material reached a satisfactory specific capacitance of 2937.6 F g−1 at 1 A g−1. The assembled asymmetric supercapacitor (ASC) delivers a high energy density of 41.8 W h kg−1 at 800 W kg−1. This work provides insights for the rational construction of sulfur and selenium coexisting composite electrode materials and the optimisation of the electrode structures.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
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2022
·
IF 7.613
Y. Qu,L. Sun,F. Xie,J. Hu,H. Tan,J. Qian,X. Shi,Y. Zhang
A major challenge faced by NiS as positive electrode material for supercapacitors is the capacity attenuation caused by structural changes in the charging and discharging process. In this article, based on theoretical calculations and experimental studies, it is demonstrated that Mo doping can significantly improve the stability and specific capacitance of NiS for supercapacitor application. Experiments show that compared with original NiS/C, the cycle stability of the doped Mo-NiS/C increases by about 30% after 5,000 cycles, and the specific capacitance achieves 1,852 F/g at 1 A/g. Besides, Mo doping can bring better ion contact and increased reaction site to the original lamellar structure of NiS. The calculation results also show that the bond energy of the doped Mo-NiS/C is lower than that of the original NiS/C, which hinders the structural transformation or other side reactions and achieves a better cycle life. This article verifies the effect of Mo doping on the properties of NiS/C and provides a feasible scheme for the study of metal-doped sulfide.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Mengxiao Zhong,Weimo Li,Junjie Chen,Siyu Ren,Ruikai Qi,Ce Wang,Xiaofeng Lu
Designing high-performance and cost-effective oxygen-evolution electrocatalysts is highly required toward sustainable water electrolysis. Surface reconstruction is a promising strategy to realize the improvement of the oxygen-evolution reaction (OER) performance of transition metal-based electrocatalysts. Herein, we present a simple electrospinning-post treatment route to construct a novel Fe(III)/NiS electrocatalyst and investigate the key role of the surface reconstruction to significantly promote the OER performance. Owing to the unique tubular morphology and the formation of the highly efficient electrochemical active species of Ni(Fe)OOH during OER process, the prepared Fe(III)/NiS nanotubular catalyst exhibits a low overpotential of 264 mV at 10 mA cm −2 , superior to the benchmark RuO 2 and many other metal sulfide electrocatalysts. Furthermore, the catalyst also presents an excellent durability with no distinct activity reduction for over 70 h. This study offers a reliable surface reconstruction way to fabricate high-efficiency and outstanding durable OER electrocatalyst, enabling it promising prospect for water electrolysis with a reduced energy consumption.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2024
·
IF 10.7
Yi-lei Li,Xu-jia Liu,Yun-biao Wang,Ying Liu,Rui-hong Liu,Hui-ying Mu,Ying-juan Hao,Xiao-jing Wang,Fa-tang Li
Adjusting the interfacial transport efficiency of photogenerated electrons and the free energy of hydrogen adsorption through interface engineering is an effective means of improving the photocatalytic activity of semiconductor photocatalysts. Herein, hollow ZnS/NiS nanocages with ohmic contacts containing Zn vacancy (V Zn -ZnS/NiS) are synthesized using ZIF-8 as templates. An internal electric field is constructed by Fermi level flattening to form ohmic contacts, which increase donor density and accelerate electron transport at the V Zn- ZnS/NiS interface. The experimental and DFT results show that the tight interface and V Zn can rearrange electrons, resulting in a higher charge density at the interface, and optimizing the Gibbs free energy of hydrogen adsorption. The optimal hydrogen production activity of V Zn -ZnS/NiS is 10,636 μmol h −1 g −1 , which is 31.9 times that of V Zn -ZnS. This study provides an idea for constructing sulfide heterojunctions with ohmic contacts and defects to achieve efficient photocatalytic hydrogen production.
研究领域:
材料科学
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能源科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yaqiong Gong,Yu Lin,Zhi Yang,Feixiang Jiao,Jinhui Li,Wenfei Wang
The investigation of earth-abundant, durable, and efficient bifunctional electrocatalysts for overall water splitting was critical to future renewable energy systems. Herein, flower-like Mn-doped Cu 7.2 S 4 @NiS 2 @NiS was successfully assembled on 3D nickel foam (NF) substrate via a facile two-step hydrothermal‑sulfuration method (denote as flower-like Mn 2 -CNN/NF). Benefited from unique 3D configuration with firm contact between nanoflowers and Ni foam, flower-like Mn 2 -CNN/NF electrode demonstrated a low overpotential of 252 mV to achieve a current density of 50 mA cm −2 and 24 h-long stability toward oxygen evolution reaction (OER) in 1 M KOH. For hydrogen evolution reaction (HER), a stable current density of 10 mA cm −2 at only an overpotential of 87 mV and a low Tafel slope of 43.7 mV dec −1 were observed. Furthermore, when assembled as electrolyzers on both cathode and anode for stable water splitting, a low cell voltage of 1.514 V was needed for flower-like Mn 2 -CNN/NF to afford the current density of 10 mA cm −2 and distinguished durability for over 46 h was observed, which presented a wide range of possibilities for the development of earth-abundant and high efficient electrode pairs.
研究领域:
材料科学
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可再生能源
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电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Zehui Liu,Jinzhao Huang,Feng Jiao,Ke Zhang,Guixin Zhao,Xiaolong Deng
Electrochemical water splitting is considered to be an environmentally friendly and efficient method of hydrogen production. NiFe LDH is a well-known electrocatalyst for oxygen evolution, yet its effectiveness in HER has been suboptimal. In this research, we created a Mo-NiFe LDH@NiS catalyst on carbon cloth via cation doping and heterointerface construction of NiFe LDH. The resulting Mo-NiFe LDH@NiS/CC showed remarkable HER activity. Furthermore, when used as a bifunctional electrode for overall water splitting, Mo-NiFe LDH@NiS/CC operated at a cell voltage of 1.58 V at a current density of 10 mA/cm² and exhibited outstanding durability. This study emphasizes the significant enhancement in HER and overall water-splitting efficiency of NiFe LDH achieved through Mo doping and heterostructure engineering, advancing its potential for effective water splitting applications.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
2D Materials
·
2022
·Vol. 10
·期 1
·014004
·
IF 6.861
Guanshun Xie,Yisong Zhu,Changqiang Yu,Xiuqiang Xie,Nan Zhang
Steering photogenerated electron flow to the effective reactive sites is ideal for photocatalytic H2 evolution. Herein, as a proof-of-concept, NiS is coupled with a typical Schottky heterojunction of Ti3C2Tx MXene@In2S3 through the photodepotition method towards improving the photocatalytic H2 evolution performance. In addition to the Schottky effect-mediated electron transfer in Ti3C2Tx MXene@In2S3 heterojunctions, p–n junctions form between In2S3 and NiS to extract photoinduced electrons, which is found to cooperate with the role of effective H2 evolution reactive sites. The synergistic dual functions of NiS cooperate with Ti3C2Tx MXene promote multichannel electron transfer in Ti3C2Tx MXene@In2S3-NiS hybrids to improve the photocatalytic hydrogen evolution reaction (HER) efficiency by 41 times compared to the bare In2S3. These results enlighten the engineering of the spatial transfer of photoinduced electrons to the reactive sites toward boosting the efficiency of photocatalytic HER.
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 3
·期 8
·2056-2066
·
IF 4.912
Shundong Guan,Xiuli Fu,Zhezhu Lao,Chuanhong Jin,Zhijian Peng
Coupling two-dimensional earth-abundant element based electroactive species with three-dimensional carbon substrates is a promising but highly challenging strategy to prepare highly active, robust and eco-friendly electrocatalysts for sustainably generating hydrogen and oxygen from water splitting. Here we report a facile one-step collaborative growth method to directly construct NiS–MoS2 hetero-nanosheet arrays on carbon cloth (NiS–MoS2 HNSAs/CC) by introducing sodium dodecyl sulfate as a surfactant together with Ni, Mo and S sources. Benefiting from the well-exposed electroactive sites, fast transport of catalysis-relevant species and strong synergistic catalytic effect between NiS and MoS2, the as-prepared NiS–MoS2 HNSAs/CC exhibits excellent electrocatalytic performance for water splitting in 1 mol L−1 KOH, presenting an overpotential of 106 mV for the hydrogen evolution reaction and 203 mV for the oxygen evolution reaction at 10 mA cm−2, and superior kinetics for them with a Tafel slope of 56.7 and 77.4 mV dec−1, respectively. Moreover, a current density of 10 mA cm−2 at a low cell voltage of 1.54 V for overall water splitting could be achieved along with an excellent stability for at least 24 h. This simple strategy might also be applied to assemble other kinds of active species on different inert substrates, providing new insight into the design and development of high-performance electrocatalysts and other electrochemical devices.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Xin-Yu Huang,Zong-Tao Chi,Jian Liu,Dong-Hua Li,Xiao-Jun Sun,Cong Yan,Yu-Chong Wang,Hao Li,Xue-Dong Wang,Wan-Feng Xie
Heterostructured semiconductor materials, combining the collective advantages of individuals and synergistic properties, have spurred great interest as a new paradigm toward detecting of volatile organic compounds recently. Direct use of NiS as a sensing material is impractical because the structure of NiS is unstable, exhibiting an undesirable sensing performance. Herein, we firstly report its incorporation into an ethanol gas sensor with a conventional n -type sensitive material of In 2 O 3 , and the gas sensing performance of the NiS@In 2 O 3 nanocomposites has been significantly enhanced. Nanofiber-like NiS and In 2 O 3 were fabricated via a synergetic approach of electrospinning and calcination processes. The diameters of crystalline NiS and In 2 O 3 are about 150 nm and 120 nm, respectively. Then, the NiS@In 2 O 3 nanocomposites were prepared via re-calcination of as-prepared NiS and In 2 O 3 nanofibers. The results show that the sensor based on NiS@In 2 O 3 exhibits a detecting limit of as low as 5 ppm and a short response time of 8 s at the optimum temperature of 300 ºC, which outstripped that (13 s) of pristine In 2 O 3 and pure NiS sensors (21 s) for the detection of ethanol gas. The remarkable improvement of sensing performance can be attributed to the p - n heterojunction in multi-component phases of NiS and In 2 O 3 .
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Kun Song,Wenting Li,Rui Yang,Yongjie Zheng,Xiaoshuang Chen,Xin Wang,Guoli Chen,Weichao Lv
As a battery-type electrode material , Ni(OH) 2 has been widely concerned for its ultra-high theoretical specific capacity, however, its poor conductivity and lack of effective active sites hinder its application. It is a great challenge to develop Ni(OH) 2 based supercapacitors . It is critical to improve the electrical conductivity and effective active sites to make full use of the energy storage of Ni(OH) 2 -based materials. Therefore, Ni(OH) 2 /NiS composites are designed and prepared by controllable low temperature chemical deposition and ion exchange method. Ni(OH) 2 nanosheets with various morphology are controllably prepared by low temperature chemical deposition, and then Ni(OH) 2 /NiS composites are controllably prepared on Ni(OH) 2 substrate by ion exchange. Due to the doping of NiS into Ni(OH) 2 nanosheets, the conductive network structure is formed, which makes the composite exhibit excellent electrochemical properties, such as high specific capacity, large specific surface area and good electrical conductivity. The as-fabricated Ni(OH) 2 /NiS indicates an outstanding specific capacity of 240.5 mAh g −1 at 1 A g −1 . This paper detailed studies the practical application of hybrid supercapacitors , which may inspire future researchers to design Ni(OH) 2 -based materials with desired applications.
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 Nano Materials
·
2024
·
IF 5.3
Minghao Dou,Wensong Wang,Xiang Liu,Mengjie Yao,Kai Ding,Weiwei Lin,Xiuwen Cao,Chaoyue Li,Shenjie Li,Yanyan Chen
Compared with the oxygen precipitation reaction (OER), the theoretical application of urea oxidation reaction (UOR) with a smaller potential is more conducive to achieve H2 release, showing a strong application prospect in the field of wastewater treatment. However, the efficiency of the traditional nickel foam-based catalyst is still subject to the following two factors: the high oxidation potential of Ni3+ and the uncertainty of the oxidation and reduction active sites. Here, with the advantage of two-dimensional sheet porous high surface area, a Ni(OH)2 nanosheet was prepared by depositing ZIF-67 to inhibit the formation of Ni3+ and maximize the space utilization. Then, the NiS/Co3S4/Ni3S2 nano heterostructure was constructed to improve the interface electronic structure and optimize the adsorption energy of the intermediates via in situ vulcanization. The NiS shell on the surface of the catalyst provides sufficient reaction sites for the catalytically active substance NiOOH generated during the UOR at a lower oxidation potential. At a current density of 50/100 mA cm–2, the overpotential is only 1.330/1.340 V while maintaining the catalytic durability for 20 h. At the same time, the NiS/Co3S4/Ni3S2/NF nano heterostructure material shows good urea degradation performance and stability, which provides the possibility of degradation and treatment of industrial, agricultural, and domestic wastewater containing urea.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 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）