Article
Chemistry, Multidisciplinary
June Sung Lim, Jae Hyung Kim, Jinwoo Woo, Du San Baek, Kyuwook Ihm, Tae Joo Shin, Young Jin Sa, Sang Hoon Joo
Summary: The study found that the carboxyl group at the edge sites of graphitic carbons is the primary active site for the 2e ORR, while the carbonyl group is a secondary active site. The nanoporous carbon catalyst with abundant active edge sites and optimized structure exhibited the highest H2O2 electrosynthesis activity and excellent long-term stability.
Article
Chemistry, Physical
Qingjia Sun, Guanxing Xu, Bingyan Xiong, Lisong Chen, Jianlin Shi
Summary: Electrocatalytic 2e(-) oxygen reduction reaction (2e(-) ORR) is a promising method for H2O2 production in acidic media. In this study, a novel and high-performance 2e(-) ORR electrocatalyst, NiSe2, was developed and the influence of different anion species on the catalyst performance was investigated. The synthesized NiSe2 exhibited outstanding 2e(-) ORR performance and long-term durability.
Article
Chemistry, Physical
Deiaa M. Harraz, Sophia Weng, Yogesh Surendranath
Summary: Studying the factors that affect the selectivity of the oxygen reduction reaction (ORR) in nonaqueous media is important, but the methods for quantifying ORR selectivity have not been systematically studied in nonaqueous electrolytes. In this study, we found that the conventional Pt ring electrodes and RRDE protocols for nonaqueous media do not result in mass-transport-limited H2O2 oxidation. Instead, H2O2 oxidation on Pt surfaces is strongly activation-controlled and depends on the electrolyte and solvent. We identified Au as a superior catalyst for nonaqueous H2O2 oxidation and developed a protocol for calibrating and correcting for sluggish H2O2 oxidation kinetics, which improves the estimation of H2O2 selectivity for ORR catalysis in certain nonaqueous electrolytes.
Article
Chemistry, Physical
Zunxing Liu, Dong Wang, Mengqiong Zhang, Hongchao Ma, Guowen Wang
Summary: We evaluated a facile and efficient approach of improving the activity and selectivity of Co-N-C catalysts by introducing O functional groups at different pyrolysis temperatures. H-cell test showed a H2O2 output of 2170 ppm within 6 hours, meeting the in-situ degradation of antibiotics (Ofloxacin) and offering a reliable on-site environmental treatment option.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Mengmeng Jin, Wei Liu, Jiaqiang Sun, Xinzhong Wang, Shusheng Zhang, Jun Luo, Xijun Liu
Summary: This study demonstrates an active and stable catalyst composed of highly dispersed Ag nanoclusters on N-doped hollow carbon spheres, which can effectively reduce O-2 molecules into H2O2 with high selectivity and durability in acidic media.
Article
Chemistry, Inorganic & Nuclear
Weining Zhang, Yuandong Yan, Jing Wang, Zhenhua Yang, Taozhu Li, Hu Li, Shicheng Yan, Tao Yu, Weiliu Fan, Zhigang Zou
Summary: In this study, ZnSn(OH)(6) and SrSn(OH)(6) were used as catalysts to investigate the effects of frustrated Lewis pairs (FLPs) on electrochemical CO2 reduction. The higher formate selectivity of ZnSn(OH)(6) can be attributed to the strong ability of FLPs to capture protons and activate CO2 through the electrostatic field, leading to improved electron transfer and strong orbital interactions. These findings provide guidance for the design of electrocatalysts with high catalytic performances for CO2 reduction.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Ao Yu, Guoming Ma, Longtao Zhu, Yajing Hu, Ruiling Zhang, Hsien-Yi Hsu, Ping Peng, Fang-Fang Li
Summary: Defects on carbon nanotubes can be used to promote catalytic reactions, and a method involving reduction of CO2 in Li2CO3-based molten salts has been developed to synthesize defect-rich CNTs in an eco-friendly and controllable manner. The degree of defects in CNTs can be adjusted by changing the applied electrolysis current, with lower current favoring the synthesis of CNTs with more defect sites. These defect-rich CNTs, particularly the ones synthesized under 300 mA cm(-2) electrolysis, exhibit superior performance in the oxygen reduction reaction compared to those synthesized under higher current densities.
Article
Electrochemistry
Ming Cheng, Zongge Li, Tongxin Xu, Yuxin Mao, Ying Zhang, Guoxin Zhang, Zifeng Yan
Summary: The ability to efficiently promote the 2e- O2 reduction and 2e- H2O oxidation reactions on CeO2 (100) facets is reported for the first time. CeO2 nanocubes demonstrate high selectivity and faradic efficiency, outperforming facet-unspecified CeO2 nanodots and many previous noble metal or carbon-based electro-catalysts.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Shin-ichi Naya, Haruya Suzuki, Hisayoshi Kobayashi, Hiroaki Tada
Summary: This study demonstrates that antimony-doped tin oxide (ATO) is a robust renewable catalyst for electrochemical synthesis of hydrogen peroxide (H2O2) from water and oxygen. Antimony doping into SnO2 significantly enhances the electrocatalytic activity for two-electron oxygen reduction reaction (2e--ORR) with a volcano-type relation between activity and doping levels (xSb). Density functional theory simulations indicate that the isolated Sb atom in ATO plays a crucial role in inducing high activity and selectivity for 2e--ORR by enhancing O2 adsorption, reducing activation energy, and lowering H2O2 adsorption. Electrolysis using ATO (xSb=10.2 mol %) in a normal three-electrode cell at -0.22 V continuously produces H2O2 with a turnover frequency of 6.6 s-1, and this remarkable activity can be maintained even after removing the surface layer of ATO.
Article
Chemistry, Physical
Zhaolei Wang, Xinxuan Duan, Marshet Getaye Sendeku, Wenwen Xu, ShiYao Chen, Benqiang Tian, Wenqin Gao, Fengmei Wang, Yun Kuang, Xiaoming Sun
Summary: This study presents an atomic Ni-doped TiO2 electrocatalyst for efficient synthesis of H2O2 through 2e- water oxidation. By combining with the 2e- oxygen reduction reaction using an oxidized carbon nanotube cathode, a high Faradaic efficiency of 146% for H2O2 is achieved. This work demonstrates the potential of atomically controlled metal oxide electrocatalyst for on-site H2O2 production.
Article
Chemistry, Physical
Ayeong Byeon, Jae Won Choi, Hong Woo Lee, Won Chan Yun, Wenjun Zhang, Chang-Kyu Hwang, Seung Yong Lee, Sang Soo Han, Jong Min Kim, Jae W. Lee
Summary: This study demonstrates that CO2-derived edge-B-doped porous carbon is an effective catalyst for electrochemical H2O2 production, with high activity and stability. The catalyst shows outstanding mass activity and the highest production rate among reported studies, with a faradaic efficiency maintained for over 100 hours.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Yunjin Yao, Hongda Zheng, Zhongming Tao, Yaoyao Wang, Zhenshan Ma, Yongjie Qiu, Shaobin Wang
Summary: The rational design of low-cost and high-efficient non-precious-metal based Fenton-like catalysts, such as mesoporous graphitic carbon nitride (m-CN) supported copper phosphide (Cu3P@m-CN) catalysts, has gained significant attention. Cu3P@m-CN demonstrated excellent stability and high activities in organic oxidation using H2O2 as the oxidizing reagent, showing effectiveness over a wide pH range. The removal efficiency of pollutants is influenced by various factors, including catalyst type and loading, main operating parameters, and different water matrices. The combination of Cu3P and m-CN proved to be a feasible strategy in preparing effective catalysts for the mineralization of organic pollutants.
APPLIED SURFACE SCIENCE
(2023)
Article
Environmental Sciences
Yue Cao, Wei Zhang, Yegeng Sun, Yuhang Jiang, Ning Han, Jiexin Zou, Weimeng Si, Fagang Wang, Avelino Nunez-Delgado, Shaomin Liu
Summary: A Fe-N-B-C bifunctional electrocatalyst was prepared by hydrothermal reduction of graphene oxide, showing enhanced response in potential for reduction of H2O2 and O-2. The material exhibited promising properties for commercial and environmental applications, such as a low detection limit for H2O2 and high selectivity and resistance to methanol crossover in O-2 reduction.
ENVIRONMENTAL RESEARCH
(2021)
Article
Chemistry, Physical
Chenxi Xu, Liang Chen, Yongliang Wen, Shifeng Qin, Huanxin Li, Zhaohui Hou, Zhongyuan Huang, Haihui Zhou, Yafei Kuang
Summary: In this study, a cooperative protection strategy was proposed to fabricate Fe-N-x/Fe3C@NC with abundant Fe-N-x moieties and highly dispersed Fe3C nanodots, displaying high activity and robust durability towards oxygen reduction reaction. This strategy offers guidance for the preparation of high-performance transition metal-N-C-based catalysts for energy storage and conversion systems.
MATERIALS TODAY ENERGY
(2021)
Article
Chemistry, Physical
Malarkodi Duraivel, Saravanan Nagappan, Kang Hyun Park, Kandasamy Prabakar
Summary: Halloysite nanotubes (HNT) are naturally occurring one-dimensional porous clay minerals with hydroxyl functional groups suitable for O2 evolution reaction. Coating HNT-based electrocatalyst on Ni foam substrate shows excellent water oxidation activity and stability in alkaline electrolyte solution.
APPLIED CLAY SCIENCE
(2022)