INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Yuyu Li,Fang Luo,Yuhua Xie,Chaofeng Chang,Ming Xie,Zehui Yang
Urea oxidation reaction (UOR) is a promising substitution of oxygen evolution reaction (OER) in overall water splitting technology because of the lower theoretical potential; thereby, a win-win benefit is achieved due to the simultaneous hydrogen generation and water purification . The efficient UOR catalysis substantially depends on the exposed active sites and mass transfer resistance, especially at high current density to meet the requirement of industrial water splitting technology. In this work, we have synthesized α-Ni(OH) 2 porous nanoflowers (α-Ni(OH) 2 –PNF) using ZIF-67 as template. Ascribing to the Kirkendall effect , nanopores are created on α-Ni(OH) 2 nanosheets benefiting for the formation of abundant oxygen vacancies as well as drop-off in mass transfer resistance during UOR catalysis. Meanwhile, the binding strength between active site and CO 2 , rate-determining step of UOR, is weakened by oxygen vacancies; as a result, only 1.477 V vs. RHE is demanded for α-Ni(OH) 2 –PNF to catalyze UOR with 100 mA cm −2 , 67 mV lower than α-Ni(OH) 2 nanosheets. Besides, an exceptional stability is also achieved for α-Ni(OH) 2 –PNF with negligible degradation during 20 h catalysis.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Shuai Sun,Tianci Wang,Kejiang Qian,Hao Zhang,Kaifeng Ji,Zijian Shi,Mingyu Chen,Cui Zhang,Shuangxi Liu
High-efficiency water splitting catalysts are competitive in energy conversion and clean energy production. Herein, a bifunctional water splitting catalyst CoNiP with cation vacancy defects (CoNiP–V) is constructed through defect engineering. The results show that abundant cation vacancy defects in CoNiP–V are bifunctional active centers in the process of water electrolysis , which enhance the activity of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In 1.0 mol L −1 potassium hydroxide, CoNiP–V requires a pretty low overpotential of 58 mV to reach a geometrical current density of 10 mA cm −2 for HER. To deliver a current density of 100 mA cm −2 , only 137 mV and 340 mV of overpotential are needed for HER and OER, respectively. Moreover, the cell with CoNiP–V as both cathode and anode exhibits good stability, which only needs 1.61 V to achieve a current density of 100 mA cm −2 , and the cell voltage barely rises 10% after 100 h’ test under 100 mA cm −2 . Therefore, CoNiP–V is promising for the development of efficient water splitting catalysts.
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Journal of Materials Research and Technology-JMR&T
·
2023
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IF 6.4
Yuxin Wang,Jie Wang,Zihan Liu,Songlin Zheng,Wei Lu,Zhen He
This study developed a series of lightweight composite films with adjustable reflectivity and superior mechanical properties. Carbon fiber (CF) was electroplated with both conventional and nanocone-shaped Ni coatings to create Ni-plated carbon fiber (CF@Ni), which was then further classified into conventional Ni carbon fiber (CF@CN) and nanocone-shaped Ni carbon fiber (CF@NN). CF@Ni fibers were sheared and filtered to produce Ni-plated carbon fiber fabric (CFF@Ni), which was then encapsulated in polyimide resin (PI) to form the final thin film materials (CF@Ni/PI). The shielding performance and mechanical properties of these CF@Ni/PI thin films have been comprehensively investigated. The study found that the nanocone-shaped Ni-plated samples exhibited superior performance. Absorption loss was dominant when a relatively low amount of Ni-plated carbon fiber was added, while reflection loss dominated when a relatively high amount was added. Adding 0.3 g of nanocone-shaped Ni carbon fiber created a 1.2 mm thin film with a shielding effectiveness of 71 dB and a tensile strength of 22.4 MPa. Additionally, the thin film demonstrated excellent flexibility and durability. Due to its exceptional mechanical properties and flexibility, this composite film holds significant potential in the fields of microelectronics and intelligent electronic devices.
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JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Xiaocan Wang,Zhangtang Jiang,Yichang Ma,Xiangyu Su,Xikang Zhao,Aimei Zhu,Qiugen Zhang
Anion exchange membrane water electrolysis (AEMWE) is a feasible pathway to industrial-scale production of hydrogen due to the use of low cost, non-precious metal catalysts . In this study, we demonstrate a stable NiFe 2 O 4 anodic oxygen evolution reaction (OER) catalyst to achieve durable and efficient AEMWE via a simple strategy combining hydrothermal and thermal reduction reactions. The prepared NiFe 2 O 4 -50 catalyst, with polyhedral-sphere hybrid morphology and abundant oxygen vacancies , exhibits an overpotential of 280 mV at 50 mA cm −2 and a Tafel slope of only 44.6 mV dec −1 for OER. Moreover, its use as oxygen evolution electrode in AEMWE cell assembled with a Pt/C cathode show excellent water electrolysis performance with a current density of high to 4 A cm −2 at 1.89 V, a cell voltage of only 1.64 V at 1 A cm −2 , as well as good long-term stability over >1000 h of continuous water electrolysis under a current density of 1 A cm −2 . The newly developed NiFe 2 O 4 catalyst demonstrates excellent AEMWE performance and has a potential application for practical large-scale hydrogen production .
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ACS ES&T Water
·
2023
·
IF 5.3
Ming Liu,Hua Zou,Penghui Shao,Hao Jia,Guoshuai Liu
The presence of metals and complexing agents in wastewater poses serious threats to public health and aquatic ecosystems. Electrochemically advanced oxidation processes can break down heavy metal compounds, but recovering these metals at the cathode presents challenges. To address this concern, we explore amidoxime, known for its high complexation capacity and hydrophilicity, as a cathodic microenvironment modifier to enhance heavy metal adsorption and immobilization. We develop a novel carbon felt (CF) amidoxime-functionalized group (CFAG) cathode for cathodic nickel recovery from Ni–EDTA. Experimental results show a significant improvement in nickel recovery efficiency with amidoxime functionalization. Specifically, CFAG outperforms CF by 2 times, driven by nickel recovery reaction kinetic constants of 0.0202 min–1 for CFAG and 0.0101 min–1 for CF. Furthermore, cycling and desorption experimental results have validated the enduring stability and regenerative attributes of the CFAG electrode, and the density functional theory calculations confirm that nickel binds more effectively to amidoxime groups than conventional polymer groups on CF. This study presents a promising electrochemical approach for recycling metals in complex heavy metal wastewater, making metal resource recovery more economical and efficient.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Heng Luo,Hira Rehman,Xinyu Xia,Jinfei Zheng,Ping Li,Yang Li,Jinchao Tong
The development of wide-band microwave absorbing materials based on carbonaceous fillers remains a great challenge. In this study, carbon nanotubes (CNT) assembled coronal hollow clusters with efficient microwave absorbing performance have been obtained through successive hydrothermal and calcination process. Microstructural analysis reveals the distinct features of multiple assembly structures in the fabricated materials. The electromagnetic responses of Ni/CNT assembled clusters were examined across a frequency range of 2–18 GHz. Results demonstrate that the microwave frequency dispersion of electromagnetic parameters and reflection loss of Ni/CNT clusters are strongly influenced by weight loading. Multi-absorbing peaks with reflection loss better than − 40 dB could be achieved, while the equivalent absorbing band for RL < −10 dB covers 3.2–18 GHz, which account for 92.5% of the whole evaluated frequency range, and 62.5% for condition of RL < −20 dB. Furthermore, intrinsic attenuation beyond thickness derived semi-wavelength resonant absorption makes a major contribution to this superior performance. The underlying mechanism of dielectric response was investigated through Cole-Cole analysis and finite element simulation. ‘Micro-dipoles’ relaxation and hopping relaxation originated from defects within CNT and barrier between CNT, while the high magnetic dissipation capability of Ni nanoparticles make a major contribution to overall absorbing performance. All these are beneficial to regulation and optimization of microwave absorption performance of novel Ni/ CNT functionalized multistage architecture.
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CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Xiran Qin,He Ding
The development of new, efficient, and low-cost OER electrocatalysts with advanced structures is of great significance for hydrogen production by electrolysis of water. A Ni-doped ferrous oxalate nanorod electrocatalyst (Ni-FeC 2 O 4 ) was synthesized using a one-step solvothermal method, which showed an outstanding OER activity with a low overpotential of 296 mV at 10 mA cm −2 . The Ni-FeC 2 O 4 electrocatalyst exhibited excellent OER stability in the 300 mV constant potential test, which was mainly attributed to the fact that Ni doping can increase the electrochemical active surface areas and the interfacial charge transfer abilities of the FeC 2 O 4 electrocatalyst, optimize the electronic structure of the real active species ferric hydroxide, promote the formation of the decisive step *OOH of ferric hydroxide, and improve its intrinsic activity.
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JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Jiaming Yang,Jun Zhou,Zhengrong Liu,Yueyue Sun,Chaofan Yin,Kaiteng Wang,Ruhuan Li,Zilin Zhou,Kai Wu
In-situ exsolution technique, as an efficient and controllable strategy of surface modification, has been extensively applied in reversible solid oxide cells (RSOCs). Here, we demonstrate La x Sr x Ti 0.9 Ni 0.1 O 3-δ fiber decorated by exsolved Ni nanoparticles and highlight the impacts of A-site deficiency on Ni exsolution and electrochemical performance of RSOCs. The La 0.4 Sr 0.4 Ti 0.9 Ni 0.1 O 3 (A/B = 0.8) fibrous fuel electrode decorated by Ni nanoparticles with moderate Ni exsolution displays optimum electrochemical performance at 800 °C, achieving ∼540 mW cm −2 in SOFC mode and −0.742/0.385 A cm −2 under 1.3/0.7 V in RSOC mode. In contrast, high A-site deficiency (A/B < 0.8) allows heterogeneous phases (NiTiO 3 ) and excessive Ni exsolution along with alterations of fibrous morphology, leading to slow gas diffusion, sluggish catalysis, and Ni agglomeration. The distribution of relaxation time (DRT) results show that the rate-limiting steps in symmetrical cells are gas diffusion, hydrogen adsorption, and dissociation, accounting for over 89% of the total R P . Ni-equilibrium model based on X-ray Rietveld refinement calculates the degree of exsolution with various A-site deficiency, revealing NiTiO 3 is the key factor of excessive exsolution. Our work of high A-site deficiency exemplified here may serve in the design and nanoengineering of fibrous ABO 3 perovskite oxides for RSOCs.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jiaxin Li,Yifei Liang,Zhao Li,Ke Fan,Chunxue Wang,Kai Li,Yuan Li,Xin Sun,Ping Ning,Fei Wang
The synthesis of methane from syngas represents a pivotal technology in the artificial synthesis of natural gas, with the study of methanation catalysts being a fundamental aspect of this process. Extensive research has focused on CO methanation using Ni/Al 2 O 3 catalysts; however, enhancements in catalyst stability and low-temperature activity are still required. This research investigated the structure of Ni/Al 2 O 3 under H 2 reduction at varying temperatures and the catalytic performance in natural gas synthesis (SNG) through CO methanation. It was observed that a higher reduction temperature resulted in nickel species agglomeration. Notably, Ni catalysts reduced at 600 °C demonstrated optimal CO conversion and CH 4 selectivity under the tested conditions. Characterization studies uncovered a synergistic effect between Ni and NiO species, which was most effective for catalytic activity under hydrogen reduction at 600 °C but only at an appropriate reduction temperature. These insights are significant for the advancement of Ni/Al 2 O 3 methanation catalysts in natural gas production .
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NANOTECHNOLOGY
·
2023
·Vol. 34
·期 46
·465404
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IF 3.5
Penghui Bai,Kai Lei,Juan Xie,Hu Wang,Xiaolan Kang,Xia Wang
This paper investigates the impact of Pd/Ni modification on the photocatalytic hydrogen production performance of SrTiO3 (STO). STO catalysts were synthesized using a hydrothermal method, and Pd/Ni modification was applied on the surface of STO through chemical deposition. Experimental results demonstrate that the hydrogen evolution rate of Pd/Ni-modified STO (Pd/Ni-STO) reaches 2232.14 μmol g−1 h−1. X-ray absorption fine structure spectroscopy analysis reveals substitutional doping of Ni with Ti and coordination of Pd with surface O. X-ray photoelectron spectroscopy analysis indicates the introduction of oxygen vacancies due to Pd/Ni doping. Density functional theory calculations suggest that Ni doping activates neighboring Ti atoms, leading to the formation of bimetallic catalytic sites composed of oxygen vacancies and Ti atoms, greatly enhancing the photocatalytic hydrogen evolution performance. This study not only provides an effective catalyst for photocatalytic applications but also offers insights into the underlying mechanism, which may stimulate the development of metal-doped catalytic materials and have implications for a range of other applications.
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Small
·
2023
·
IF 13.3
Jian Song,Xue Lei,Jiali Mu,Jingwei Li,Xiangen Song,Li Yan,Yunjie Ding
Heteroatom-doping is an effective method for modifying the geometric symmetry of metal–nitrogen–carbon (M–N–C) single-atom catalysts and thereby tuning the electronic structure. Up to now, most of the current reports have concentrated on introducing heteroatoms into the highly symmetrical M–N 4 structure. The coordination-unsaturated M–N 2 structure is more sterically favorable for the insertion of alien atoms to optimize the electronic structure. Herein, a Ni–N 2 catalyst with out-of-plane coordinated chlorine (Cl) atoms (Ni–N 2 Cl/C) is successfully constructed on chlorine-functionalized carbon supports (C–Cl) for an efficient carbon dioxide reduction reaction (CO 2 RR). Density functional theory calculations demonstrate that the prepared Ni–N 2 Cl/C catalyst exhibits a higher capability in balancing COOH* formation and CO* desorption. In addition, in situ Raman spectra confirm that the lower CO binding energy on the Ni–N 2 Cl/C facilitates CO escape, leading to excellent CO 2 RR performance. A high CO Faradaic efficiency (FE CO ) of more than 80% is achieved from −0.6 to −1.2 V versus reversible hydrogen electrode on the Ni–N 2 Cl/C and it exhibits negligible FE CO and current declination over a 40-h stability test. Furthermore, a high turnover frequency (TOF) value of 15 808 h −1 is obtained, which is more than ten times that of Ni–N 2 /C (1476 h −1 ) without coordinated Cl atoms.
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ADVANCED MATERIALS
·
2023
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IF 29.4
Ye Feng,Chao Gao,Dazhi Xie,Lu Liu,Bin Chen,Suyi Liu,Haihong Yang,Zhan Gao,Daniela A. Wilson,Yingfeng Tu,Fei Peng
Neural stem cells (NSCs), with the capability of self-renewal, differentiation, and environment modulation, are considered promising for stroke, brain injury therapy, and neuron regeneration. Activation of endogenous NSCs, is attracting increasing research enthusiasm, which avoids immune rejection and ethical issues of exogenous cell transplantation. Yet, how to induce directed growth and differentiation in situ remain a major challenge. In this study, a pure water-driven Ni–Zn micromotor via a self-established electric–chemical field is proposed. The micromotors can be magnetically guided and precisely approach target NSCs. Through the electric–chemical field, bioelectrical signal exchange and communication with endogenous NSCs are allowed, thus allowing for regulated proliferation and directed neuron differentiation in vivo. Therefore, the Ni–Zn micromotor provides a platform for controlling cell fate via a self-established electrochemical field and targeted activation of endogenous NSCs.
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