INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·Vol. 38
·期 25
·10191-10195
·
IF 3.548
Zhuobin Yu,Qiang Zhao,Genyan Hao,Wen Yuan,Jinping Li
A weakly acidic H 3 BO 3 solution (pH = 5.1) was used to synthesize new oxygen-evolution catalysts for water splitting under mild conditions. Two novel oxygen-evolution catalysts, Co–BA i and Mn–BA i (BA i = inorganic boric acid), were obtained in the H 3 BO 3 solution with added Co 2+ and Mn 2+ , respectively. The average oxygen evolution rate in the H 3 BO 3 solution with Co 2+ was 0.3133 μmol/h, about 70 times greater than the rate without a metal ion ; the rate with Mn 2+ was 1.13 μmol/h, about 250 times greater. The phases, morphologies, and compositions of the Co–BA i and Mn–BA i catalysts were analysed by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy .
研究领域:
材料化学
·
电催化
·
能源科学
·
无机化学
·
可持续能源技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 81
·77358-77365
·
IF 3.289
Ting-Ting Li,Jinjie Qian,Yue-Qing Zheng
Metal–organic frameworks (MOFs) have been demonstrated as suitable metal sources and sacrificial templates for the preparation of porous transition-metal oxide nanomaterials. Herein, porous CuO micro-polyhedra assembled from numerous nanoparticles are synthesized simply by employing a Cu-based MOF as a precursor via a one-step calcination process under an air atmosphere. Benefitting from their high porosity and large specific surface area, porous CuO materials exhibit excellent electrocatalytic performances toward water oxidation in pH 9.2 KBi solution. A low catalytic onset potential at 1.05 V vs. NHE (NHE = normal hydrogen electrode) is obtained based on electrochemical measurements. A faradaic efficiency of nearly 98% and a stable catalytic current density of 2.2 mA cm−2 are achieved under an applied potential of 1.30 V vs. NHE over an electrolysis period of 10 h. In addition, based on the Tafel plot, the required overpotentials are only ∼410 mV and ∼510 mV for achieving the catalytic current densities of 0.1 mA cm−2 and 1.0 mA cm−2, respectively. The excellent performances make it an appealing candidate as a potential catalyst for green energy applications.
研究领域:
材料化学
·
电化学
·
纳米材料
·
能源催化
·
无机功能材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Hongying Yang,Zhenfeng Cheng,Pengchao Wu,Yahui Wei,Jingyun Jiang,Qun Xu
Design and fabrication of 2D multi-metal oxalate materials with desired electrochemical activities are highly needed in electrocatalysis and supercapacitors . Herein, assisted by the deep eutectic solvothermal (DES) method, multi-metal oxalate consisting of Fe, Co, Ni, Cu, and Zn with different morphology was the controlled synthesis. It was found that the structure and composition of DES can control the nucleation and growth of multi-metal oxalate. High molecular PEG and gradually slow-release oxalic acid are in favor of the formation of 2D structure, while the low molecular EG and abundant oxalic acid are positive for the formation of 3D nanoparticles. The properties of the obtained multi-metal oxalates are confirmed by multi-analysis, which involves the single Ni-oxalate phase, morphological evolution ranging from particles to nanosheets, and complex composition up to five metal elements including Fe, Co, Ni, Cu as well as Zn. Notably, the well-designed 2D (FeCoNiCuZn)(C 2 O 4 )·2H 2 O nanosheets exhibit an ultralow overpotential of 334 mV at 100 mA cm −2 for OER as electrocatalyst with prolonged durability over 30 h at 10 mA cm −2 and a high specific capacity of 1337 C g −1 for aqueous supercapacitor.
研究领域:
材料化学
·
电化学
·
纳米材料
·
能源存储
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 31
·19968-19978
·
IF 10.7
Zicheng Huang,Wenjie Shao,Yijuan Zheng,Junyu Wang,Mao Wang,Shuang Li,Xiaohui Xu,Chong Cheng,Changsheng Zhao
Transition metal oxide-based catalysts are known as the most active oxygen evolution reaction (OER) catalysts due to their intrinsic electronic structures and binding strength of oxygenated intermediates. However, even the most active transition metal oxide-based OER catalysts have a turnover frequency far lower than that of the oxygen-evolving complexes in biological systems for intermolecular site aggregation. Herein, we implement the hybridization of a metal–organic framework and tungstic acid (WO3·xH2O-in-MIL-88) to achieve ordered FeNi site isolation at the molecular level and avoid intermolecular decomposition during the catalysis process. The optimized hybrid with 15% tungstic acid (15%-WO3·xH2O-in-MIL-88) achieves a much-enhanced OER activity and stability in terms of a low overpotential of 263 mV to reach a current density of 10 mA cm−2, a low Tafel slope of 39 mV dec−1, and long-term stability, which is much superior to that of the commercial RuO2 catalyst.
研究领域:
材料化学
·
电化学
·
催化化学
·
能源科学
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2017
·
IF 2.299
Yuan-Zi Xu,Cheng-Zong Yuan,Xue-Ping Chen
To design highly efficient and low-cost electrocatalysts for oxygen evolution reaction (OER) is a great challenge for electrochemical water splitting. Here we introduce a simple and cost-effective strategy for one-step synthesis of a three-dimensional Ni 3 S 2 /MoS X (x is close to 3) nanosheets on Ni foam (NF) via a sovelthermal reaction. The electrochemical performance of the Ni 3 S 2 /MoS X nanosheets on NF has been investigated and exhibits superior OER electrocatalytic activity as well as excellent electrochemical durability. As a novel non-noble-metal OER catalyst operating in basic electrolytes, this 3D cathode exhibits an onset overpotential of as low as 165 mV, a Tafel slope of 67.5 mV dec −1 and remarkable long-term stability. This catalyst maintains its catalytic activity for at least 14 h and only affords 50, 100, and 150 mA cm −2 OER current densities at overpotentials of 215 mV, 265 mV and 305 mV respectively.
研究领域:
材料科学
·
电化学
·
能源化学
·
纳米科技
·
催化化学
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 26
·2310387
·
IF 13
Wei Luo,Yanli Yu,Yucheng Wu,Wenbin Wang,Yimin Jiang,Wei Shen,Rongxing He,Wei Su,Ming Li
Rational design of heterostructure catalysts through phase engineering strategy plays a critical role in heightening the electrocatalytic performance of catalysts. Herein, a novel amorphous/crystalline (a/c) heterostructure (a-CoS/Ni 3 S 2 ) is manufactured by a facile hydrothermal sulfurization method. Strikingly, the interface coupling between amorphous phase (a-CoS) and crystalline phase (Ni 3 S 2 ) in a-CoS/Ni 3 S 2 is much stronger than that between crystalline phase (c-CoS) and crystalline phase (Ni 3 S 2 ) in crystalline/crystalline (c/c) heterostructure (c-CoS/Ni 3 S 2 ) as control sample, which makes the meta-stable amorphous structure more stable. Meanwhile, a-CoS/Ni 3 S 2 has more S vacancies (S v ) than c-CoS/Ni 3 S 2 because of the presence of an amorphous phase. Eventually, for the oxygen evolution reaction (OER), the a-CoS/Ni 3 S 2 exhibits a significantly lower overpotential of 192 mV at 10 mA cm −2 compared to the c-CoS/Ni 3 S 2 (242 mV). An exceptionally low cell voltage of 1.51 V is required to achieve a current density of 50 mA cm −2 for overall water splitting in the assembled cell (a-CoS/Ni 3 S 2 || Pt/C). Theoretical calculations reveal that more charges transfer from a-CoS to Ni 3 S 2 in a-CoS/Ni 3 S 2 than in c-CoS/Ni 3 S 2 , which promotes the enhancement of OER activity. This work will bring into play a fabrication strategy of a/c catalysts and the understanding of the catalytic mechanism of a/c heterostructures.
研究领域:
材料科学
·
电化学
·
催化化学
·
纳米材料
·
能源材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2011
·Vol. 36
·期 13
·7374-7380
·
IF 4.057
Wei Wang,Qiang Zhao,Jinxiang Dong,Jinping Li
A novel silver oxides oxygen evolving catalyst (Ag-OEC) for hydrogen production by water splitting was formed in situ on an indium tin oxide anode, in a near-neutral potassium tetraborate (K 2 B 4 O 7 ) electrolyte. The catalyst exhibited high activity and low overpotential for O 2 evolution under mild conditions. The main functional composition of the catalyst was a redox couple of Ag 2 O/AgO. Catalytic activity during oxygen evolution was evaluated by cyclic voltammetry and Tafel plot. The effects of the concentration, temperature, and pH of K 2 B 4 O 7 solution on the catalyst, and the Faradaic efficiency of the oxygen evolving reaction were examined. The results show that the Ag-OEC exhibits excellent oxygen evolution properties, with an oxygen evolving overpotential of 318 mV at a current density of 1 mA/cm 2 .
研究领域:
电催化
·
能源化学
·
材料科学
·
物理化学
·
可持续能源
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Tao Zhang,Zhiyuan Ling
Architecture construction of electrode is one key factor for hydrogen generation from electrochemical water splitting. To enhance the efficiency of oxygen evolution reaction (OER) at high current density , the architecture construction must be designed skillfully to prevent the surface blanketed by gas bubbles. In this work, we developed a three-level hierarchical surface with cluster-like nickel (Ni) nanowire array. The contact angle measurement indicates the surface having excellent hydrophilicity . The OER performance characterization reveals that after the surface is loaded with NiFe-based catalyst the Ni nanowire array electrode can deliver 500 mA cm −2 at an overpotential of 297 mV in 1 M KOH solution and can survive for over 24 h under 500 mA cm −2 operation. All the results demonstrate that the cluster-like nanowire array is beneficial for the spatial pathway separation for electrolyte supply and gas bubbles departure and the enhancement of OER efficiency.
研究领域:
材料科学
·
电化学
·
能源材料
·
纳米技术
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Hongguan Li,Jing Wang,Ruijuan Qi,Yongfeng Hu,Jing Zhang,Hongbin Zhao,Jiujun Zhang,Yufeng Zhao
Charge and spin manipulations of electrons are considered to be of great significance in boosting the catalytic activity of M N C electrocatalysts. However, to the best of our knowledge, most current studies focus only on the charge engineering, the interplay between spin and charge is not well understood, and the simultaneous manipulation of both charge and spin remains challenging. Herein, we show that the cooperative interplay between charge itineration and spin-polarization of electrons has a profound impact on the catalytic behavior through density functional theory (DFT) calculations for the first time. Following this concept, we report a Fe-Ni atomic pair as a superior bifunctional catalyst for high performance ORR and OER, with a very small potential difference (ΔE) of 0.691 V. We confirm that the coexistence of Fe 3d itinerant charge and moderate spin polarization (magnetic moment: 1.48 μ B ) is responsible for the superior functional catalytic activity for the Fe Ni atomic pairs.
研究领域:
电催化
·
材料化学
·
物理化学
·
纳米催化
·
能源材料
·
计算化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Meng Wan,Han Zhu,SongGe Zhang,HaoNan Jin,YanKun Wen,LiNa Wang,Ming Zhang,MingLiang Du
Oxygen evolution reaction (OER) plays an important role in various renewable energy systems . Owing to its complex four-electron redox process , the OER process with sluggish kinetics often requires electrocatalysts to reduce the overpotential and promote the reaction rate. Herein, we have proposed an “all-in-one” strategy to synthesize mutil-elemental perovskite oxides nanofibers (NFs) with hollow and porous structures by using electrospinning technology and Ostwald ripening approach. The hollow La 0.7 Sr 0.3 Co 0.25 Mn 0.75 O 3 nanofibers (LSCM NFs) consist of large amounts of building block La 0.7 Sr 0.3 Co 0.25 Mn 0.75 O 3 nanoparticles (LSCM NPs), forming the unique architecture and the morphologies can be engineering by adjusting the calcination temperatures and the heating rates . Notably, the hollow LSCM NFs prepared at 800 °C and 10 °C min −1 demonstrated the excellent electrocatalytic performance, with overpotential of 340 mV at current density of 10 mA cm −2 and Tafel slope of 111 mV dec −1 , as well as the long-term stability in alkaline electrolyte . The hollow NFs architectures exhibited a large specific surface area , a high porosity and a large inner space, which are beneficial for the OER, reducing the overpotentials and accelerating the electrode kinetics .
研究领域:
材料化学
·
电化学
·
纳米材料科学
·
能源催化
·
功能材料
·
可再生能源
✓ 已验证
DOI
高影响因子
CARBON
·
2018
·
IF 7.082
Xian Wang,Zuju Ma,Lulu Chai,Leqiong Xu,Ziyi Zhu,Yue Hu,Jinjie Qian,Shaoming Huang
Growing demand for clean and renewable energy resources has sparked intensive research on the development of an effective strategy to prepare non-noble metal electrocatalysts for oxygen evolution reaction (OER). Herein, we report a new type of N-doped carbon coated CoP particle/carbon nanotube composite (CNT-NC-CoP) has been synthesized by in situ nucleation and growth of ZIF-67 nanoparticles onto carbon nanotubes, which subsequently is treated with carbonization and phosphorization. Unique hierarchical structure endows as-obtained CNT-NC-CoP with high specific surface area , abundant exposed active sites, quick ion diffusion path , and good electrical conductivity , thus exhibiting the highest electrocatalytic capability with the low overpotential of 251 mV at the current density of 10 mA cm −2 and remaining long-term durability (overlapping LSV curve after 10 h). Besides, density functional theory (DFT) calculations reveal that CoOOH/graphene charged surfaces are more effective for facilitating intermediates adsorption and improving the corresponding catalytic activity .
研究领域:
材料化学
·
电化学
·
纳米材料科学
·
能源催化
·
功能材料
·
计算材料学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 4
·5841-5851
·
IF 3.741
Zhi Ming Wang,Peng Liu,Yan Peng Cao,Feng Ye,Chao Xu,Xiao Ze Du
Summary In this study, novel Pt-IrO 2 nanofiber catalysts for oxygen evolution reaction (OER) were successfully prepared using the electrospinning method with a high-concentration precursor solution. The composition and structure of catalysts were characterized, and the electrocatalytic performance of the nanofiber catalysts in water electrolysis was investigated from various aspects such as overpotential, charge transfer resistance, and exchange current density. Special attention was paid on the effect of Pt/Ir ratio on the electrocatalytic activity of the electrospun nanofibers. The results showed that the Pt-IrO 2 nanofiber catalysts with average fiber diameters ranging from 10 to 100 nm can be successfully obtained by the electrospinning method, and the average diameter decreased with the increase of Pt content. Since a bigger amount of IrO 2 content and a thinner fiber structure are all beneficial to the electrocatalytic performance, the Pt-IrO 2 catalysts with Pt:Ir = 1:9 and Pt:Ir = 9:1 both showed better catalytic performance for OER than the commercial IrO 2 , which was also demonstrated by the lower charge transfer resistance and higher exchange current density. As a result, the overpotentials of Pt-IrO 2 catalysts with Pt:Ir = 1:9 and Pt:Ir = 9:1 are 50 mV and 32 mV lower than the overpotential of the commercial IrO 2 at 30 mA cm −2 in 0.5 M H 2 SO 4 , respectively. The electrospun Pt-IrO 2 nanofiber catalyst with proper Pt content seems to be very promising since it can not only improve the catalytic performance and the safety of PEM electrolysis cells, but also reduce the amount of more expensive Ir in catalysts.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）