The latest collection of energy storage battery research

I. Science: Seeing single-atom catalyzed growth of graphene

Just published in the Science article reported that researchers from Italy used Ni (111) surface growth graphene as the research object, through the in-situ, high-speed scanning tunneling microscope to observe the graphite growth process.

- Graphic quick solution -

Figure 1: Graphene grows along the Z and K sides

Figure 2: Ni atoms adsorbed by graphene edges

Figure 3: Graphene growth path calculated by DFT

2. ACS Nano: High-efficiency and stable electronic layer transport layer of double-layer structure in perovskite solar cells

Recently, Professor Chen Wei of the Wuhan Optoelectronics National Laboratory of Huazhong University of Science and Technology invented a surface modification method based on monodisperse oxide nanoparticles. The modified nanoparticles can be well realized in both polar and non-polar solvents. Dispersion, it is very convenient to form a high quality interface film on top of the perovskite film at low temperatures. The highly dispersed CeOx nano-ink facilitates the formation of a fully covered inorganic interfacial layer. It works well with PCBM for perovskite solar cells. (1) Effectively shields external moisture from damaging the perovskite material. (2) Avoid decomposition of the perovskite during operation. The metal electrode is corroded. Under this dual protection, the working stability of perovskite solar cells has been greatly improved. The prepared battery has an initial efficiency of up to 18.6% and is stored in a dark state for 30 days under 30% RH humidity with almost no attenuation. The same batch of batteries were subjected to continuous light aging for 200 hours in an N2 atmosphere glove box or an air atmosphere of 30% RH, and the maximum power point of the battery was tracked and tested. The experiment showed that the battery efficiency was almost no attenuation. The article was published in the international top journal (well-known journal) ACS Nano (impact factor: 13.9).

Third, Nature Communications: New technology for small-molecule sulfur fixation boosts the development of high-performance lithium-sulfur batteries

Recently, Professor Wang Wei from Wenzhou University, together with the academician of the Canadian Academy of Engineering, Professor Chen Zhongwei of the University of Waterloo, and Dr. Lu Jun of the Argonne National Laboratory of the United States published an academic paper at Nature Communications, which first proposed the use of organic small molecules. The innovative idea of ​​“fixing sulfur” has achieved the stability of long-term circulation of high-load sulfur positive electrode.

1A is a schematic view showing the preparation of a ruthenium/graphene/sulfur composite cathode material, and FIGS. 1B and 1C are graphs of charge and discharge performance of a lithium-sulfur battery. As can be seen from the figure, the bismuth/graphene/sulfur composite cathode material has extremely stable cycle capacity, and the average capacity per lap is reduced by 0.019% in 300 cycles; after 0.5 kW of charge and discharge, the total capacity is still Maintain at least 81% of the initial capacity. This stable charge and discharge behavior means that natural abundant cerium (AQ) small molecules can effectively inhibit the dissolution and loss of intermediate polysulfides.

figure 1. (A) Schematic diagram of the synthesis of the cathode material of the lithium-sulfur battery; (B) the cycle performance of the battery at a current density of 0.5 C and (C) the comparison of the rate performance of the battery at different current densities.

Fourth, Nature Nanotechnology: Oligomeric Rotaxane

Recently, Professor Anne-Sophie Duwez of the University of Liege, Belgium, joined the Nobel Prize winner, Northwestern University, J. Prof. Fraser Stoddart used single molecule force spectroscopy to study the folding and unfolding process of synthetic oligomeric rotaxanes, revealing the chemical and chemical properties of such molecules. Related papers are published in Nature Nanotechnology.

Professor Anne-Sophie Duwez (second from left) and J. Professor Fraser Stoddart (third from left). Image source: Duwez Lab / University of Liège

The authors first synthesized [5] rotaxane molecules and formed folds based on the interaction of electron donors and acceptors. The molecule contains four electron-deficient bipyridyl rings (CBPQT4+, blue ring of Figure 1) as acceptors, and electron-rich 1,5-dioxophthalene units (DNPs) linked by flexible polyoxyethylene chains (PEO). , Figure 1 red ball) donor. To achieve the tensile test of the folded body, it is first fixed between the tip of the AFM and the substrate, so the authors respectively introduce a 1,2-dithiolan ring unit at both ends of the [5] rotaxane molecule ( Figure 1 black ball), which can be connected to the gold-containing substrate and the AFM tip by Au-S interaction.

figure 1. [5] Chemical structure of the alkane.

5. Nano Energy: a dual-functional catalyst for LaFeO3-δ

Recently, Associate Professor Wang Chundong of Huazhong University of Science and Technology collaborated with the University of Macau, Quanzhou Normal University, Morgan State University, Chinese Academy of Sciences Suzhou Nanotechnology and Nano-Bionic Institute and Professor Liu Meilin of the Georgia Institute of Technology to develop a P-doped LaFeO3- δ dual-function catalyst for ORR and OER in alkaline solution, Associate Professor Wang Chundong and Professor Liu Meilin are co-authors of the paper. Due to the doping effect of P, a large amount of O2 2-/O-, a small amount of high-priced Fe4+ and an optimized electron filling level of iron (eg≈1) are formed, and the electrocatalytic performance is remarkably improved based on the above reasons. After P doping, the mass activity and specific activity were nearly doubled. Density functional theory calculations also confirmed that P doping leads to the formation of Fe4+ ions. These results indicate that the non-metallic element P doping optimizes the electronic configuration and changes the valence state of Fe ions, thereby increasing its catalytic activity. Related results were published on Nano Energy under the title "Engineering phosphorus-doped LaFeO3-δ perovskite oxide as robust bifunct nal oxygen electrocatalysts in alkaline solutions".

[Graphic introduction] Figure 1 Structure diagram of LF and LFP-5 perovskite

(a) Schematic diagram of the crystal structure of LF and LFP perovskites;

(b) XRD patterns of LF and LFP-5;

(c) an SEM image of the LF;

(d) SEM image of LFP-5.

Figure 2 Microscopic characterization of LF and LFP-5 perovskites

(a-c) TEM, HRTEM and SAED images of LFP-5;

(d) HAADF-STEM image of LFP-5;

(e-i) is the corresponding element distribution image of LFP-5, respectively.

Sixth, the first fuel cell product that exceeds 5000 hours of durability

Recently, HYMOD developed by Xinyuan Power Co., Ltd. (hereinafter referred to as “Xinyuan Power”), a shareholding company of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences? -300 type fuel cell stack module for vehicles, using high stability, high performance "film-based catalytic layer membrane electrode design" and high reliability "composite bipolar plate structure", verified by life test and vehicle application. It broke through the 5,000-hour durability of the fuel cell for vehicles and became the first self-developed fuel cell product with a durability of over 5,000 hours. At the same time, the product also achieves low temperature start-up of the stack at -10 ° C and storage at -40 ° C.

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