ACS Applied Energy Materials
·
2019
·
IF 0
Shiyao Zheng,Feng Zheng,Haodong Liu,Guiming Zhong,Jue Wu,Min Feng,Qihui Wu,Wenhua Zuo,Chaoyu Hong,Yan Chen,Ke An,Ping Liu,Shunqing Wu,Yong Yang
In this work, a series of ordered rocksalt (OR) type Li-rich Li2Ru1–xNixO3−δ (LRNxO, 0.3 ≤ x ≤ 0.5) are successfully synthesized and investigated for the first time. X-ray diffraction and neutron powder diffraction patterns exhibit an obvious phase transition from layered to an OR structure as the Ni content gradually increases from x = 0 to x = 0.5, which leads to different electrochemical behaviors. In the case of OR-LRN0.4O, an ∼350 mV decrease of the oxygen oxidation potential compared with Li2RuO3 (LRO) is observed from around 4.2 to 3.85 V, which is confirmed by both X-ray photelectron O 1s spectra and dQ/dV results. The role of Ni substitution on the oxygen redox reaction is studied by first-principles calculations, and it is concluded that the formation of the OR structure caused by Ni substitution is the main reason for lowering the oxygen oxidation potential. In addition, the average discharge voltage of OR-LRN0.4O is also enhanced compared with LRO. This work provides a novel innovative strategy to modulate and control the oxygen anion redox reaction for high-energy-density Li-rich materials, which shed light on the fundamental understanding and optimizing of the anion redox process in Li-rich materials.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 21
·9375-9381
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IF 3.591
Shuping Liu,Xiaowen Su,Dongxue Chu,Chao Ma,Yu Fu,Xiaoshu Qu,Jiahui Lu,Huanan Guan
Polyoxometalates (POMs) with their unique physical and electrochemical nature have been a promising class of electrochromic (EC) materials. Although extensive research has been conducted, much effort has been devoted to the enhancement of the EC properties. Among a variety of factors, the electrolytes exhibit great influences on the EC properties. In this paper, we fabricated a composite film based on nickel-substituted Dawson-type tungstophosphate (P2W17Ni) and TiO2 nanowires by a two-step process involving hydrothermal treatment and a layer-by-layer method (LbL). As a result, the composite film displays transparent to dark blue in both Li+-based non-aqueous and H+-based aqueous electrolytes. Compared to the H+-based electrolyte, the composite film in Li+-based media shows a larger optical modulation of 53.3% and higher coloration efficiency of 85.6 cm2 C−1. The fast switching times of 7.7 s for coloration and 2.2 s for bleaching in Li+-based solution are observed. In addition, the composite film remains almost stable even after 800 cycles in Li+-based solution. The enhancement of the EC properties may be due to the unique nanowire structure, high insolubility and applied potential in Li+-based solution. These results make POMs attractive candidates for EC devices in both non-aqueous and aqueous electrolytes.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2018
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IF 3.463
Weiming Wu,Xiao-Yuan Wu,Can-Zhong Lu
A new nickel substituted silicotungstate ([Ni 4 (H 2 O) 2 (SiW 10 O 38 ) 2 ] 8− , Ni 2 SiW 10 ) was builded by NiCl 2 and Na 10 SiW 9 O 34 under mild conditions. It was used as a carbon-free homogeneous catalyst for the efficient visible-light-induced hydrogen production from water splitting with fluorescein sodium and triethanolamine as a photosensitizer and sacrificial electron donor, respectively. The initial rate of the H 2 evolution was 239 μmol h −1 , corresponding to a turnover frequency of 28 h −1 . Further results suggested that a reductive process was dominant in the present system for fluorescein sodium, and the production of H 2 came from water splitting.
研究领域:
催化化学
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可再生能源
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Meng-Meng Wang,Qing Chen,Dan-Dan Zhang,Xu-Wei Chen,Ming-Li Chen
By virtue of the flexible structure of polyoxometalates , Ni 2+ is encapsulated into trivacant lacunary tungstophosphate ligands by the form of [Ni 4 ] cluster to offer a tetra-nickel substituted polyoxotungsate K 6 Na 4 [Ni 4 (H 2 O) 2 (PW 9 O 34 ) 2 ] (Ni 4 P 2 ). The Ni 4 P 2 is then immobilized onto the surface of SiO 2 nanoparticles by self-assembly under electrostatic interactions to give the product of Ni 4 P 2 @SiO 2 composites. Due to the specific affinity between substituted Ni 2+ in the polyoxotungsate and the histidine residues of protein, Ni 4 P 2 @SiO 2 composites exhibit highly adsorption selectivity towards histidine protein. This Ni 4 P 2 @SiO 2 composite is of high stability, and SDS-PAGE assay indicates that it can be used repeatedly as an efficient sorbent for the isolation of His6-tagged proteins from cell lysate with improved performance when compared with commercial NTA-Ni 2+ column.
研究领域:
生物化学
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材料科学
·
蛋白质纯化
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shu-Fang Li,Bao-Qin Zhang,Yu-Qing Wang,Dong Yan
Prior studies have demonstrated that Ruddlesden–Popper (RP) type perovskite oxides exhibit promising electrocatalytic properties for oxygen evolution reaction (OER). However, the limited electrocatalytic activity has impeded their widespread utilization. The incorporation of heteroatoms into the Ruddlesden–Popper type structure has been identified as an effective strategy to enhance the electrocatalytic performance. This research presents the systematic design and synthesis of RP type perovskite oxide LaSrFeO 4 (LSFO), followed by the optimization of electrocatalytic activity through Ni substitution at the Fe site of SLFO to create LaSrFe 1- x Ni x O 4 (LSFNO- x , x = 0.2, 0.4, and 0.5). Therein, the LSFNO-0.4 sample achieved a current density of 10 mA·cm −2 with an overpotential of only 340 mV. Additionally, it displayed exceptional stability over 120 h in a 1.0 M KOH solution. Both experimental and theoretical studies suggest that the addition of Ni cation increases the Fe − O covalency, and impacts the morphology and surface electron density of LSFO. This substitution results in a greater electrochemically active surface area, improved electron transfer, and optimization of hydrogen/water absorption free energy. This study presents a successful approach for enhancing the OER performance of Ruddlesden–Popper LSFO through the deliberate control of Fe − O covalent bonding.
研究领域:
材料科学
·
电化学
·
催化
✓ 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）