Yajing Di

Beijing University of Chemical Technology

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Zhengping Zhang

Beijing University of Chemical Technology

Zhongdong Yin

North China Electric Power University

Xiangning Xiao

North China Electric Power University

Feng Wang

Beijing University of Chemical Technology

Renzhong Shan

North China Institute of Science and Technology

Tongtong Liu

Chongqing University

Yu Chen

Shaanxi Normal University

Haixing Zhang

Shanghai Ocean University

Yanan Chen

Tianjin University

Zhilin Li

Beijing University of Chemical Technology

Cooperative Institutions

Beijing University of Chemical Technology

Chinese Academy of Sciences

North China Electric Power University

China Southern Power Grid (China)

University of Chinese Academy of Sciences

Yangzhou University

Shanghai Electric (China)

Chongqing University

Sinopec (China)

Sinopec Research Institute of Petroleum Processing

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Metal‐Free Electrocatalysts for H2O2 Electrosynthesis: From Sites Identification to Electrochemical Advanced Oxidation Process

ChemCatChem (2025)

Yu Chen Yajing Di Haixing Zhang Yiming An Jie Miao

Carbonaceous materials especially the metal‐free carbons have attracted widespread attentions owing to their risk free with metal dissolving during the electrocatalysis process, but their further developments are still hindered by missing a suitable scenario on practical applications. Herein, we demonstrate a successful case of using the oxygen‐containing‐groups modified carbons for the H2O2 electrosynthesis and the derivate electrochemical advanced oxidation process. The active sites with the more C‐O rather than C=O groups are easily obtained by controlling the temperature and time in the wet chemical treatment. Identified by theoretical calculations and electrochemical testing, the modified carbons with the highest ratio of C‐O/C=O groups exhibit the high activity with the above 90% H2O2 selectivity over the entire potential during 2e‐transfer oxygen reduction reaction, attributing to their enlarged charge delocalization. In addition, the corresponding gas diffusion electrodes with the high‐speed and high‐stability H2O2 electrosynthesis (2.78 μg s‐1 cm‐2 with the above 80% current efficiency) are applied for the electro‐peroxone process on the simulant and practical phenolic wastewater, where the chemical oxygen demand removal reaches above 90%. The long‐term operation in the harsh electrochemical environment for over 200 h also confirms its great potential on practical electrochemical applications.

Electrosynthesis

Identification

10.1002/cctc.202401889

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Rare‐Earth Oxychlorides as Promoters of Ruthenium Toward High‐Performance Hydrogen Evolution Electrocatalysts for Alkaline Electrolyzers

Advanced Materials (2025)

Tongtong Liu Yanan Chen Xinyu Wang Yajing Di Kläus Müllen

Developing efficient electrocatalysts for hydrogen evolution reaction (HER) in alkaline environments is vital for hydrogen production, owing to the extra water dissociation and hydroxyl desorption steps. Here, rare-earth oxychlorides (REOCl) are proposed as innovative promoters for ruthenium as HER electrocatalyst in alkali. The lamellar structure of REOCl with weakly bond [Cl] layers can facilitate the formation of an internal electric field that enhances interphase charge transfer. Taking ruthenium/ neodymium oxychloride (Ru/NdOCl) composites as a case study, sub ≈4 nm Ru nanoparticles are successfully embedded into NdOCl crystals through a rapid self-exothermic process, and the highly-coupled Ru-Cl/O-Nd interfaces are observed as metallic Ru particles with the edge of the NdOCl lamellar layers, where the [Nd2O2] and [Cl] layers act as the negative and positive charge transfer channels, respectively. The enhanced charge transfer between REOCl and Ru makes the highly-coupled Ru/REOCl catalysts show better electrocatalytic activity than both the benchmark Pt and Ru catalysts in alkaline electrolyte. This work will encourage more novel promoters for electrocatalysis and other emerging technologies.

Overpotential

Reversible hydrogen electrode

Nanoporous

10.1002/adma.202417621

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Research on a Novel Dynamic Voltage Quality Regulator in Medium Voltage

International Conference on Energy and Environment Technology (2009)

Yajing Di Zhongdong Yin Xiangning Xiao Renzhong Shan

In accordance with the familiar power quality problem, such as voltage sag, flicker, harmonic suppression and short circuit fault, this paper designed a novel series voltage quality regulator in medium voltage for the multiple objective control basing on the cascaded multilevel H-bridge method, and analysis its working principle in detail. A Short-circuit current limiter is designed in this paper, the control strategy multiple objective control is proposed as well. The simulation model is established by PSCAD/EMTDC. Finally, the rationality of the main circuit topology design is tested through low-voltage experiment. The simulation result and the text show that the design of voltage regulator and the control strategy this paper proposed can compensate the voltage feasibly and efficiently.

Voltage Sag

Low-dropout regulator

10.1109/iceet.2009.290

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Lead‐Induced Microstrain in Synthesis and Manipulation of Porous Pyrochlore for Boosting Oxygen Evolution Reaction

Advanced Functional Materials (2023)

Qingren Zhang Tongtong Liu Hengyu Guo Yanan Chen Yajing Di

Abstract Pyrochlore ruthenates are highlighted as candidates to replace iridium oxide as oxygen evolution reaction (OER) electrocatalyst, but their designable geometric configurations and composition modulations are hampered by the high‐temperature (≈1100 °C) and long‐time calcination (more than 12 h), which further decreases the technical and economic feasibility. In this work, an energy‐ and time‐saving approach is proposed to prepare pyrochlore yttrium ruthenate at a much lower calcination temperature (600 °C) and shorter calcination time (6 h) just by inducing A‐site substitutions of lead ions (YPRO). The local microstrain derived from Pb provides the surficial compression and extra driving force to overcome the strain energy of phase‐transition resistances and the obtained low‐temperature YPRO exhibits enriched pores, deficient geometries, shortened Ru─O bond, and enlarged Ru─O─Ru bond angle, which further modify the electronic structure, involving of the rearranged band alignment and the eliminated bandgap. The regulated morphologic, geometric, and electronic structures in YPRO synergically boost the electrocatalytic OER performance (4.8‐fold and 30.0‐fold enhancements compared with pyrochlore yttrium ruthenate and commercial iridium dioxide (IrO 2 ), respectively) in universal pH conditions. This substitution‐induced strain engineering on phase transition should also be effective for other high‐temperature materials and trigger their diverse intriguing properties.

Oxygen evolution

10.1002/adfm.202306176

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Enhancement voltage stability of wind farm access to power grid by novel SVC

Junjie Zhang Zhongdong Yin Xiangning Xiao Yajing Di

This paper studies the voltage stability problems of wind farm access to electric grid. Based on the equivalent circuit of asynchronous machine, it deduces the relationship of wind turbine angular velocity rotation with the induction generator terminal voltage. Aiming at wind power for 10 kV distribution grid, a novel SVC is proposed to replace the fixed capacitors compensating devices. The reactive power can be detected based on the instantaneous reactive power theory and with this method the reactive power compensation is fast and continuous. The voltage level of wind farm access system is stable with a voltage feedback control strategy. The new SVC winding structure can achieve a multi-pulse, injecting the system small harmonic current component. Research results show that a corresponding control strategy of the novel SVC compensation device can be very good to improve voltage stability of wind farm access to the grid.

10.1109/iciea.2009.5138602

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Multi objectives operation of cascade inverter-based voltage quality compensator with PWM rectifier supply

Renzhong Shan Zhongdong Yin Xiangning Xiao Yajing Di Ke Li

A novel main circuit topology of voltage quality compensator (VQC) is proposed in this paper, composed of PWM rectifier and cascade H-bridges inverter. The three phase inverter is decoupling controlled. PWM rectifier is adopted to maintain the dc-bus voltage stably and provide or absorb real power. The inverter is controlled by carrier phase shifting with FPGA. The simulation model is set up on the platform of PSCAD/EMTDC, the voltage sag, swell and harmonic compensation is researched by theoretical and simulation. Finally, the simulation results show that the proposed main circuit topology and control strategy is feasible and efficient for multi objectives voltage quality compensation.

PWM rectifier

Voltage Sag

Decoupling (probability)

Rectifier (neural networks)

10.1109/peds.2009.5385751

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Study on Improvement Measures for Lightning Stroke Breaking of 10kV Overhead Insulated Conductor in Distribution Network

2022 4th International Conference on Electrical Engineering and Control Technologies (CEECT) (2022)

Hong Qiu Chen Yuting Yajing Di Tao Huang Sa Congmin

In 10kV distribution lines in China, the use of overhead insulated conductors is common. However, the probability of lightning striking the insulated conductor is also high. This paper analyzes the situation of line tripping caused by a lightning stroke, starting from the installation process and the use of binding materials, analyze the electromagnetic induction, find out the cause of wire breakage caused by lightning stroke, the improvement measures are proposed. Verified by operation in actual operation, it proves the feasibility and correctness of the method proposed in this paper.

Tripping

Lightning

Overhead line

10.1109/ceect55960.2022.10030652

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Multi-level voltage quality adjustment device based on FPGA control

Hong Qiu Zhongdong Yin Chengxin Dai Yajing Di

This paper studies the FPGA-based control 4 H-bridge cascaded 9-level structure of voltage quality adjustment device, for the variety of voltage quality issues appears in electric power system, providing a comprehensive solution. With the voltage swell, voltage sag, voltage harmonics, voltage fluctuations which occurs in the power system, it can give out the complex compensation, so as to ensure the system voltage quality, 0.1MVA/400V Low-voltage prototype was designed and developed for validating the variety of experiments. Experimental results show that the design of this device is feasibility and effectiveness.

Voltage Sag

Disturbance voltage

Swell

CPU core voltage

10.1109/iciea.2010.5515742

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Simulation Research on the Multiple Objective Voltage Quality Regulator

Yajing Di Zhongdong Yin Xiangning Xiao Zhi Zhang

Due to the complexity of power systems combined with other factors such as increasing susceptibility of equipment, power quality (PQ) is apt to waver. With electricity in growing demand, low PQ is on the rise, the method of resolve those problem about power quality must be considered. In accordance with the familiar PQ problem, such as voltage sag, voltage swell, short interruption of supply voltage, harmonic suppression and short circuit fault. Basing on the H bridge cascade connection method, this paper design a new type regulator for the multiple objective control. Through the simulation software of PSCAD/EMTDC, the device can resume the voltage and restrain the harmonic dynamically and effectively, when there are voltage disturbances in the power system side. This device also could confine the short circuit current to a supportable level, when there is short circuit fault in the load side.

Voltage Sag

Harmonic

Swell

10.1109/appeec.2009.4918764

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Carbonyl-linked cobalt polyphthalocyanines as high-selectivity catalyst for electrochemical CO₂ reduction

Chemical Communications (2024)

Haisen Jin Yajing Di Yueang Gu Yu Chen Meiling Dou

One type of carbonyl-linked cobalt polyphthalocyanine (CL-CoPPc) is synthesised as catalysts for use in electrochemical carbon dioxide (CO

10.1039/d3cc05844a

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