INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·
IF 2.93
Qizhao Wang,Guoxia Yun,Yan Bai,Ning An,Yutao Chen,Rongfang Wang,Ziqiang Lei,Wenfeng Shangguan
TiO 2 photocatalysts loaded CuS and NiS as co-catalyst were prepared by hydrothermal approach and characterized by XRD , UV–visible DRS , BET, XPS, SEM and TEM. When TiO 2 was loaded MS as co-catalyst, it showed higher photocatalytic activities for splitting water into hydrogen in methanol aqueous solution under 500 W Xe lamp. Among the photocatalysts with various compositions , the maximum evolution of H 2 obtained from 5 wt% CuS – 5 wt% NiS – TiO 2 sample was about 800 μmol h −1 , which was increased up to about twenty-eight times than that of TiO 2 alone. It was proven that CuS, NiS can act as effective dual co-catalysts to enhance the photocatalytic H 2 production activity of TiO 2 .
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xingxing Zhu,Zhengtong Ji,Wubin Wan,Yongfu Zhu,Xingyou Lang,Qing Jiang
Alkaline water electrolysis is regarded as a promising technology for sustainable energy conversion. Spinel oxides have attracted considerable attention as potential catalysts because of their diverse metal valence states. However, achieving the required current densities at low voltages is a challenge due to its limited active sites and suboptimal electron transport. In this study, we present a novel bifunctional catalyst composed of MnCo 2 O 4.5 nanoneedles grown on NiS nanosheets for water electrolysis. Remarkably, MnCo 2 O 4.5 @NiS demonstrates exceptional catalytic activity, requiring 187 and 288 mV to achieve a current density of 100 mA cm −2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. The impressive performance of MnCo 2 O 4.5 @NiS is demonstrated by the lower value of voltage 1.44 V needed to deliver the current density of 10 mA cm −2 , which outperformed the 1.66 V required for a commercial Pt/C||RuO 2 system. Detailed structure analysis and density functional theory (DFT) calculations reveal that the MnCo 2 O 4.5 @NiS heterostructure enhances electron transfer at the interface, promotes the formation of oxygen vacancies and tunes the electronic structures of Mn and Co. These findings underscore the potential of MnCo 2 O 4.5 @NiS as an efficient and cost-effective electrocatalyst for hydrogen production.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiangjia Liu,Jin Li
In this study, a ZnO/NiS@NiO/rGO (ZNNG) composite was characterized using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and scanning electron microscopy (SEM). Compared with simple ZnO, ZNNG exhibited stronger green emissions, but no ultraviolet (UV) emission peak was observed. Through a comprehensive analysis of ultraviolet–visible (UV–vis) absorption spectra, Mott Schottky (MS) plots, electron paramagnetic resonance (EPR) spectra, and X-ray photoelectron spectroscopy (XPS) results, it was proved that the stable green emissions of ZnO and its composites originated from the quenching of electrons between Zn interstitial ( Zn i ) and surface oxygen defects. The introduction of NiS@NiO caused the conduction band (CB) and valence band (VB) of ZnO to change to lower energy states, effectively increasing the absorption intensities of ZnO in the visible light, while introducing numerous oxygen-related defects on the surface of ZnO. Further addition of rGO effectively promoted the migration of electrons from the CB to the Fermi energy (E f ). These effects effectively increased the green emission of ZnO and reduced the UV emission. Finally, a proper mechanism for the near-zero band gap NiS@NiO/rGO that can significantly enhance the green emission of ZnO was proposed.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Liren Qiu,Wensheng Yang,Qian Zhao,Shengshang Lu,Xinhai Wang,Min Zhou,Benfu Tao,Quan Xie,Yunjun Ruan
The high theoretical specific capacitance, quick redox rate, and superior electrical conductivity of transition metal sulfide materials have pushed their future use in supercapacitor electrodes to the forefront. With diethanolamine as a chelator and solvent, NiS nanoflakes were grown on electrospun carbon nanofibers (CNFs) in a one-step hydrothermal procedure. The optimized NiS/CNFs-2 electrode has a high specific capacity (133.3 mAh g–1 at 1 A g–1) and an outstanding rate performance (70.62% at 10 A g–1). Furthermore, a hybrid supercapacitor assembled using a NiS/CNFs-2 cathode and an activated carbon anode delivers an energy density of 22.35 W h kg–1 and a power density of 750.8 W kg–1.
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
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 29
·14043-14051
·
IF 3.925
Hele Liu,Pengfei Tan,Huanhuan Zhai,Mingyuan Zhang,Jiaoyang Chen,Ruifeng Ren,Ziyu Wang,Jun Pan
Developing economic and high-performance noble metal-free photocatalysts is the key to realize efficient photocatalysis. In this work, NiS nanoparticles and hierarchical Sn3O4 nanostructures are tightly bonded by a two-step method combining hydrothermal and ion precipitation to construct a 0D/3D nanocomposite structure, which accelerates the interface electron transfer rate and photogenerated electron–hole separation efficiency. Compared with the pure Sn3O4, the loaded samples obviously have stronger light absorption capacity and effectively improve the utilization of visible light, thus showing enhanced photocatalytic hydrogen generation performance. NiS provides more active sites on the surface and facilitates electron transit as an electron acceptor, resulting in increased photocatalytic activity. As a result, when the loading of NiS reaches 1.0%, the photocatalyst shows an excellent hydrogen production performance, with an average hydrogen generation rate of 17.43 μmol g−1 h−1, which is 2.4 times than that of the pristine Sn3O4. This research offers a new idea to develop noble metal-free photocatalysts with high activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 23
·14602-14609
·
IF 3.269
Ke Xu,Hong Xu,Guangwei Feng,Jian Feng
NiS cocatalyst modified LaFeO3/g-C3N4 heterostructures were successfully prepared and their photocatalytic hydrogen evolution performance under visible light irradiation was presented. LaFeO3/g-C3N4/NiS composites were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption desorption isotherms, UV-vis diffuse reflectance spectroscopy (DRS), transient photocurrent responses and electrochemical impedance spectroscopy (EIS). The results indicated that the LaFeO3/g-C3N4/NiS heterostructures had enhanced photocatalytic hydrogen evolution performance than pure g-C3N4, LaFeO3 and LaFeO3/g-C3N4. 5%-LaFeO3/g-C3N4/2%NiS exhibited the highest photocatalytic hydrogen evolution rate of 121 μmol g−1 h−1 under visible light, which was almost 60 times higher than the hydrogen evolution rate of 5%-LaFeO3/g-C3N4. The effective separation of photogenerated electron–hole pairs in the LaFeO3/g-C3N4 Z-scheme system with NiS as a cocatalyst enhanced the photocatalytic hydrogen evolution performance. This study provided a facile approach to prepare NiS modified LaFeO3/g-C3N4 heterostructures and to construct an effective photocatalytic system for hydrogen evolution under visible light irradiation.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Meiqing Chen,Pingxiao Wu,Yajie Zhu,Shanshan Yang,Yonghong Lu,Zhang Lin
In order to enhance the visible light-driven photocatalytic H 2 production activity of CdZnS, an ethylenediamine-assisted hydrothermal pathway was used to synthesize CdxZn1-xS(en) with different Cd/Zn molar ratios . It was found out that the prepared Cd 0.5 Zn 0.5 S(en) possessed the highest photocatalytic H 2 production rate of 13539.0 μmol h −1 g −1 that was higher than that of CdZnS. The key to this achievement could be ascribed to the stacking faults formation, the optimum band gap with conduction band position and small crystallite size. Based on this, Cd 0.5 Zn 0.5 S(en) was modified by NiS for further improving the activity. The obtained Cd 0.5 Zn 0.5 S(en) NiS with NiS loading content of 0.25 wt% exhibited much higher photocatalytic H 2 production rate, reaching up to 38187.7 μmol h −1 g −1 that were among the highest efficiencies for semiconductor photocatalysts ever reported. It was confirmed that the nanosized NiS anchored on Cd 0.5 Zn 0.5 S(en) interface, acting as electron trapping sites, attributed to the spatial suppressions of electron-hole recombination. Meanwhile, the NiS loaded on the surface optimized the photogenerated electron transfer pathway between the semiconductor materials that gives rise to significantly enhanced photocatalytic activity . This study would put forward a facile method for developing high photocatalytic activity and low-cost catalytic material for H 2 production, which provide a new thought to address the global energy crisis and the environmental contamination.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 5
·1-13
·
IF 2.4
Lu Xingyu,Sun Jiahao,Yang Pengfei,Yang Xianjun,Hu Qin,Chen Liuyun,Qin Zuzeng,Su Tongming
CdS photocatalysts have attracted extensive attention in the area of photocatalytic hydrogen generation, yet their limited light absorption and charge transfer efficiencies still restrict their photocatalytic performance. In this study, NiS was grown on CdS to synthesize xNiS/CdS composites via a hydrothermal method and was used for photocatalytic hydrogen evolution. The introduction of NiS increased the light absorption intensity and broadened the light absorption range in the visible light region. In addition, a close contact interface formed between NiS and CdS, which accelerated the transfer and separation of photogenerated electrons and holes. Furthermore, NiS acts as the electron aggregation center and active site for photocatalytic hydrogen evolution. Therefore, the photocatalytic performance of the xNiS/CdS composites was greatly enhanced. Among the xNiS/CdS composites, the 0.5NiS/CdS composite exhibited the optimal photocatalytic hydrogen evolution rate of 36.75 mmol·h − 1 ·g − 1 , which was 7.84 times greater than that of CdS. A possible mechanism of photocatalytic H 2 production over xNiS/CdS is also proposed. This work provides new inspiration for the rational design of high-efficiency cocatalyst/CdS composites. Graphical
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 16
·3892
·
IF 4.2
Bin Yang,Xinyao Ding,Lifeng Feng,Mingyi Zhang
The development of efficient and cost-effective electrocatalysts is crucial for achieving a green hydrogen economy through electrocatalytic water splitting. Herein, we report an excellent catalyst, one-dimensional NiS2/NiS/Mn2O3nanofibers prepared by electrospinning, which exhibits outstanding electrochemical performance in an alkaline solution. We explored effective strategies to construct one-dimensional nanostructures and composite oxides to promote the electrocatalytic performance of transition metal dichalcogenides. At a current density of 20 mA cm−2, it requires an overpotential of 333 mV for OER. Furthermore, NiS2/NiS/Mn2O3nanofibers maintain good durability even after 1000 cycles. The long-term electrochemical stability test of the catalyst NiS2/NiS/Mn2O3was implemented at 20 mA cm−2for 12 h. The potential remained at 99.52%. Therefore, this study demonstrates that NiS2/NiS/Mn2O3can serve as a viable green hydrogen production electrocatalyst.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
·
2019
·Vol. 19
·期 1
·80-87
·
IF 2.408
Tingting Wei,Zhanbin Jin,Fengyan Li,Dandan Yan,Lin Xu
In this work, a series of samples of Cd0.5Zn0.5S (ZCS) nanoparticles decorated with porous TaON were successfully prepared as a direct Z-scheme system. The photocatalytic evolution of H2 with a high efficiency was explored using NiS decorated with TaON sensitized ZCS nanocomposites (NiS-TaON/ZCS) and Na2SO3/Na2S as sacrificial reagents. The results showed that 0.5 wt% NiS deposited on the surface of 4 wt% TaON-ZCS nanocomposites could reach the highest photocatalytic H2 evolution rate of 34.8 mmol h−1 g−1 with a maximum quantum yield of about 25.5% under 420 nm monochromatic light. The activity of the TaON-ZCS photocatalyst for photocatalytic H2 evolution is higher than that of either pure ZCS or TaON. This high photocatalytic performance is ascribed firstly to the hierarchical structure of the coupled semiconductor system and secondly to the efficient transfer and separation of photogenerated charge carriers with NiS as a cocatalyst, which could serve as an electron collector.
研究领域:
材料科学
·
能源科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Ju Zhang,Junli Wang,Xuanbing Wang,Naixuan Zong,Jinlong Wei,Jing Wang,Can Zhang,Yuantao Yang,Shengyou Su,Tianyang Liu,Ruidong Xu,Linjing Yang
Transition metal sulfides are widely recognized for their low cost, low toxicity, high safety, and potential as a positive electrode material for supercapacitors. However, due to its own volume effect, it usually has poor capacitance retention as positive electrode materials. Herein, the NiS/NiCo-LDH (Layered double hydroxide, LDH) electrodes with considerable practical application potential is designed and prepared. The composite electrodes are prepared by a simple two-step electrodeposition process. The NiS/NiCo-LDH electrode, with its rational design, exhibits more superior electrochemical performance compared to a single NiS electrode. The NiS/NiCo-LDH electrode shows a mass specific capacitance of 2620 F/g at a current density of 1 A/g, which is 1.88 times that of the single NiS electrode. Furthermore, the assembled NiS/NiCo-LDH//AC hybrid supercapacitor (HSC) device achieves an energy density of 93.3 Wh kg −1 at a power density of 800 W kg −1 . Therefore, this work provides a new strategy for preparing supercapacitor electrode materials with excellent electrochemical 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
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Lei Zuo,Ning Yang,Weiwei Xia,Xianghua Zeng,Rongxing Cao
Due to exceptional photocatalytic hydrogen evolution properties, ZnCdS is considered as a promising strategy to enhance the photocatalytic hydrogen evolution performance of ZnCdS with introducing sulfur vacancy or constructing heterostructures. Here, sulfur vacancy-rich ZnCdS nanoparticles were synthesized via a straightforward co-precipitation method followed by a high-temperature annealing treatment. Then NiS@ZnCdS composites were prepared with the hydrothermal method after mixed the precursors of Ni(Ac) 2 ·2H 2 O and CH 4 N 2 S with the prepared Zn 0.5 Cd 0.5 S powders. Thereafter, the prepared samples were used as photocatalysts for hydrogen production. The results showed that the optimized NiS@ZnCdS heterostructures has a photocatalytic hydrogen production rate of 42 mmol · g −1 ·h −1 , which is 14 times higher than that of the ZnCdS sample without annealing treatment. The mechanism behind has been analyzed. A staggered band energy alignment between NiS and ZnCdS was constructed from the measurements of ultraviolet photoelectron spectroscopy (UPS) and XPS spectra, and a z-scheme charge transfer mode was proposed between NiS and ZnCdS with an assistance of electron spin resonance (ESR) signals of •O 2 − . The z-scheme heterostructure between NiS and ZnCdS can enhance the separation of photogenerated electron-hole pairs and increase the photocatalytic activity. The studies will be helpful to construct the NiS related heterostructure.
研究领域:
材料科学
·
能源化学
·
催化科学
✓ 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）