JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Qi Wang,Yi Shen
Electrochemically converting nitrate (NO 3 − ) to ammonia (NH 3 ) powered by renewable energy sources offers a sustainable alternative pathway for NH 3 synthesis. Herein, bimetallic Cu Ni nanoparticles supported by carbon paper (CP) were synthesized using a facile electrodeposition method. The structures of the resulting samples were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The activity of the samples toward nitrate reduction reaction (NO 3 RR) was evaluated by linear sweep voltammetry, electrochemical impedance spectroscopy and chronoamperometry tests. The products from NO 3 RR were also determined. Compared to the counterpart catalysts including Cu/CP and Ni/CP, the CuNi/CP catalyst with bimetallic phases showed much higher faraday efficiency (FE) and yield for the NO 3 RR. The NO 3 RR catalyzed by CuNi/CP catalyst suggested a tandem mechanism in which Cu is responsible for the reduction of NO 3 − into NO 2 − , while Ni is favorable for the generation of H atoms (H*), which subsequently promotes the further conversion of NO 2 − and other intermediates to NH 3 .Benefiting from the synergistic effects of Cu and Ni, the optimal CuNi/CP catalyst efficiently converted NO 3 − to NH 3 with a high FE of 90.36 % and NH 3 yield of 3.53 mg h −1 mg −1 at −0.6 V vs. RHE in 0.5 M Na 2 SO 4 + 0.1 M NaNO 3 solutions.
研究领域:
环境科学
·
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Xu Yang,Rui Qiu,Ming-Jian Lan,Gang Chen,Wei Xu,Yu Shen
Designing the efficient, low-cost and stable electrocatalyst is of great significance for storage and conversion of the renewable energy to hydrogen. Herein, the binder-free Ni–Fe–S electrocatalysts were directly electrodeposited on Ni foam, which exhibited the excellent hydrogen evolution reaction performance with the overpotential of 51.4 mV at the current density of 10 mA cm −2 . Based on the analysis and results of as-synthesized Ni, Ni–Fe and Ni–S, the boosted electrocatalytic activity can be attributed to the composite effect between Ni and the introduced Fe and S. Additionally, the Ni–Fe–S electrocatalysts also displayed the low cell voltage (1.59 V at 10 mA cm −2 ), remarkable durability and high Faraday efficiency in overall water electrocatalysis . Moreover, the water electrolysis device with Ni–Fe–S bi-electrodes can be driven by a small wind power generation and producing 4 mL H 2 in 39 min, indicating the prepared Ni–Fe–S electrocatalyst has the great potentials in producing hydrogen via renewable energy.
研究领域:
材料科学
·
能源转换与存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Chuanyin Xiong,Mengrui Li,Shuangxi Nie,Weihua Dang,Wei Zhao,Lei Dai,Yonghao Ni
As a green and sustainable porous material, wood has attracted more and more attention of researchers, especially in the field of energy storage. However, the poor conductivity of wood limits its application. Herein, a kind of non-carbonized lignin-free wood (LFW)@PANI supercapacitor material is fabricated for renewable energy storage application. The resultant hybrid used as electrode material of supercapacitor shows a good comprehensive electrochemical performance: 1) A high cycle stability of ~96% after experiencing 5000 cycles. 2) A high specific capacitance of ~800 F g −1 and 192 F cm −3 3) Good rate performance. 4) A high energy efficiency of more than 80%. 5) High energy densities of 41 Wh kg −1 (57 Wh L −1 ), meanwhile maintaining high power densities of 43 kW L −1 (68 kW kg −1 ). Compared with the way of carbonization , non-carbonized treatment not only save energy but also be greener. This work is expected to provide more insights and possibilities for application of renewable wood-based materials.
研究领域:
材料科学
·
能源技术
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2023
·
IF 8.7
Yun Zhang,Chuanbiao Zhang,Wenjuan Li,Qiuping Xiao,Fengyuan Jiao,Sen Xu,Yanhua Lan,Yizheng Fu,Chi-Min Shu,Weiguo Cao
Stearic acid provides a basis for developing renewable energy, such as solar energy and biomass energy. A thermogravimetric-infrared spectroscopy (TG-IR) experimental test is conducted to obtain the thermal decomposition progress and the main gaseous products of stearic acid. The result shows that small gaseous products (H 2 O, CO 2 , CO, alkanes, olefins , etc.) are released. Furthermore, the method of reactive molecular dynamics simulation (ReaxFF-MD) is utilized to look into the pyrolysis reaction mechanism of stearic acid. The main pyrolysis products of stearic acid received by ReaxFF-MD are C 2 H 4 , H 2 , C 2 H 2 , CH 4 , H 2 O, CO 2 , and CO, consisting of the result of the TG-IR test. The effect of the simulated system density and temperature on the distribution of main products is also explored. Also, the thermal kinetic analysis is conducted by the initial consumption of stearic acid under different temperatures. The primary reaction mechanism of stearic acid pyrolysis is that the stearic acid molecules dissociate through C–C bonds break to generate C 2 H 4 , CH 4 , C 2 H 2 , C 3 H 6 , and other small molecules and radicals, and a typical reaction mechanism scheme of stearic acid pyrolysis is presented. The results provide a reference for explaining the macroscopic explosion characteristics of dust at the microscopic mechanism level.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Yuhang Jing,Feng Gong,Sijun Wang,Wenbin Wang,Peng Yang,Enkang Fu,Rui Xiao
Plasma-assisted ammonia synthesis (PAAS) can produce ammonia using highly energetic, electronically excited nitrogen and Hydrogen radicals at low temperatures and atmospheric pressure, which has been regarded as a prospective alternative to the Haber − Bosch process. PAAS can exclusively use renewable power (solar, wind, etc.) to achieve green, decentralized and efficient ammonia synthesis. However, current catalysts for PAAS are suffering from low efficiency, poor stability and cyclability. Herein, we demonstrate a one-step hydrothermal synthesis of Ni-Co bimetallic metal–organic frameworks (MOFs) for PAAS. Attributed to the amplified gas transport capability and bimetallic coupling, the Ni-Co-MOF exhibits significantly improved PAAS performance: 88.21 μmol g −1 ·min −1 , above 30 % increase over 5 wt% Ni/Al 2 O 3 . The high stability of Ni-Co-MOF under the harsh electric field enables its durable performance (36 h) and excellent cyclability (24 cycles). Finally, to determine the viability of PAAS for industrial applications, we construct a hypothetical zero-carbon ammonia plant using only renewable energy sources, and the outcomes indicate that PAAS has significant competitiveness for future ammonia production.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 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）