Important Dates

Submission Deadline

April 8, 2021

January 28, 2021

Registration Deadline

April 13, 2021

Conference Dates

April 23-25, 2021


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Keynote Speakers

Prof. Molang Cai, North China Electric Power University, China

Speech Title: Strategies for Stability of Perovskite Solar Cells: Dynamical Regulation and Defects Control
Abstract: The photovoltaic efficiency of perovskite solar cells (PSCs) has remarkably developed, while poor stability is a huge barrier for the commercialization of PSCs. The strategies to enhance stability are portrayed in terms of moisture and illumination endurance of photoactive layer and defects at interfaces of different layers. Here we effectively improve the stability of perovskite solar cell by fabrication high quality film as well as defects passivation.
   We developed the “perovskite” template (MAPbI3-FAI-PbI2-DMSO) structure to suppress the formation of δ-FAPbI3 phases in one-step fabrication of PSCs. In the case of sequential deposition process, the introduction of CaI2 effectively regulates the formation process of perovskite film. Both strategies passivates detrimental defects accumulated at the surface and grain boundaries of perovskite films, resulting an announced PCE over 21.24% with great stability under 800 h of thermal ageing and 500 h of light soaking in nitrogen.
   In addition, we have investigated the heterojunction properties of devices based on different self-doping perovskite film. It is found that the interface is critical for the compact TiO2 based device performances while mesoporous TiO2 based device depends on the perovskite film properties. The interfacial nonradiative recombination loss of PSCs is significantly reduced with the introduction of a CeOx interlayer between TiO2 and perovskite, which creates a cascade path for electron transport. The trap-assisted carrier recombination of SnO2 based PSC is suppressed by using passivator via the formation of coordination with under-coordinated Sn and Pb2+ ions. The champion device demonstrated a promising efficiency of 21.28% with negligible hysteresis and much improved environmental stability, i.e. retaining 98% of the initial efficiency under ambient atmosphere over 1000 h.
   Regarding to all inorganic perovskite, we introduce a non-ionic additive of polyethyleneimine (PEI) with multiple amino-groups to form hydrogen bond with I-/Br- ions and coordinate with Pb2+/Cs+ ions of CsPbI2Br simultaneously, which boosts the efficiency of perovskite solar cells to 15.48%. An impressed PCE of 13.37% is achieved by the device based on CsPbI2Br-PEI film processed under ambient condition. New type of photoactive layer such as BiI3, MA3Sb2I9-xClx have been developed, enable the encapsulated device showing no degradation after stored in ambient conditions for nearly 2 years.

Prof. Shuihua Tang, Southwest Petroleum University, China

Speech Title: Strategies for improving catalytic activity and stability of electrocatalysts in proton exchange membrane fuel cells
Abstract: Hydrogen is regarded as the ultimate green energy in future, and vehicles driven by proton exchange membrane fuel cells (PEMFCs) will become one of the most common vehicles due to their advantages of zero emission, long driving range, wide-temperature operation and rapid refueling speed, etc. Currently large-scale applications of PEMFCs still confront big issues such as hydrogen generation, storage and transportation, as well as high cost originating from expensive electrolyte membrane and Pt/C electrocatalysts. Among them, the electrocatalyst costs almost half in a fuel cell stack, therefore improve catalytic activity and stability of the electrocatalyst is crucial for mass manufacture of fuel cells.
   Up to now, many strategies have been applied to improve the performances of the electrocatalysts. Active components with various structures such as alloy, core-shell, single-atom, nanowire, nano-frame and defects are managed to be achieved. As the active component is specified, catalyst supports will play important roles to determine the catalyst performances. Presently carbon materials such as carbon black, carbon nanotubes, carbon nanofibers, graphene oxide and graphene are usually used as the catalyst support, further modified carbon materials and some metal oxides are tried to be applied for the active components. Eventually, the proper methods and procedures are considered and designed to achieve electrocatalysts with excellent catalytic activity and stability.

   This presentation will briefly introduce the strategies for improving the performances of electrocatalysts in PEMFCs.

Prof. Tao Zhu, China university of mining and technology (Beijing), China

Speech Title: Research on High-efficiency Utilization Technology of Coal Mine Ventilation Gas (Methane)
Abstract: Carbon reduction is an important measure to alleviate the human climate crisis, and the situation is very serious. China proposes a carbon peak and carbon neutral goal in 2020.The emission reduction of coal mine exhaust gas is an important measure to achieve carbon peak and carbon neutral goals, and it is also an important content of the "14th Five-Year Plan" and the 2035 long-term goal outline. The research and development of high-efficiency technologies for exhaust gas has important theoretical and practical implications for methane emission reduction. Aiming at the problems of large exhaust air gas emissions, difficult treatment, and low utilization rate, the high-efficiency utilization technology of exhaust air gas pressure swing adsorption and catalytic oxidation is introduced. On the basis of experiments, simulation software was used to build a simulation experiment platform, and the effects of adsorption pressure, half cycle, adsorption tower height to diameter ratio and mixed adsorbent ratio on the effect of PSA separation were studied by experiment and simulation respectively. The countercurrent catalytic oxidation technology is used to efficiently utilize the exhaust air gas, and the influence of the concentration, flow, cycle and catalyst on the conversion rate of methane is studied, and the optimal working condition parameters are determined. Realize the efficient utilization of methane and achieve the self-sustainment of the device. Finally, the countermeasures for the efficient utilization of coal mine ventilation gas are put forward.

Invited Speakers

Prof. Peigao Duan, Xi’an Jiaotong University, China

Speech Title: Hydro-upgrading of algal biocrude in tetralin for the production of high-quality liquid fuel: process intensification
Abstract: Herein, we report a new process for intensified hydro-upgrading of a biocrude produced from the hydrothermal processing of Auxenochlorella pyrenoidosa in tetralin at a mass ratio of 1:1 with the addition of 10 wt.% Pt/C and 8 MPa H2 at different temperatures (300-480 °C) and times (1-8 h). Under the selected reaction conditions, the gaseous products were replaced with fresh H2 at regular time intervals; this process was then continued until the total reaction time was over. Increasing both temperature and time decreased the treated bio-oil yield due to increased gas and solid products regardless of H2 replacement; however, a slightly higher treated bio-oil yield was obtained with H2 replacement. With increasing temperature and time, the C content increased, and the H, N, S, and O contents decreased. A slight increase in N and O contents was observed at 480 ℃. At temperatures ≥450 ℃, the treated bio-oil's S content was close to that of China V diesel (10 ppm). Increasing the number of H2 replacement times decrease the C, N, O, and S contents and increased the H content. The treated bio-oil mainly consisted of aromatic, saturated and unsaturated hydrocarbons, and a higher temperature and longer time produced treated bio-oil with a higher aromatic hydrocarbon content. Overall, H2 replacement removed some of the denitrogenation, desulfurization, and deoxygenation products and avoided secondary reactions of gaseous products with the bio-oil, thus promoting the hydrogenation reaction and N, O, and S removal from the treated bio-oil.