Article
Chemistry, Physical
Shuiyun Shen, Junren Chen, Xiaohui Yan, Xiaojing Cheng, Lutian Zhao, Ziwen Ren, Lin Li, Junliang Zhang
Summary: The study reveals that the performance of non-precious metal catalysts needs to find a balance between oxygen reduction activity, proton conduction resistance, and oxygen transport resistance, requiring careful and deliberate designs for MEAs based on NPMCs.
JOURNAL OF POWER SOURCES
(2021)
Review
Chemistry, Physical
Liang Ding, Tang Tang, Jin-Song Hu
Summary: In this review, the recent progress in understanding the active sites of M-N-C catalysts and the relationships between the structures of catalysts/catalyst layers and device performances are summarized. Delicately designed synthetic strategies at the catalyst level suggest that attractive device performances can be achieved by tailoring the intrinsic activity and density of the catalyst active sites while engineering the porosity of catalysts. Integrating catalyst ink into cathode catalyst layers in PGM-free PEMFCs is crucial for translating the impressive ORR performance of catalysts in RDE tests to fuel cell performance.
ACTA PHYSICO-CHIMICA SINICA
(2021)
Review
Chemistry, Physical
Ave Sarapuu, Jaana Lilloja, Srinu Akula, Jose H. Zagal, Stefania Specchia, Kaido Tammeveski
Summary: Fuel cells are a promising clean energy technology with potential in various sectors. The high cost and scarcity of noble metals used in fuel cell catalysts have hindered their commercialization. Non-precious metal electrocatalysts, particularly single-atom catalysts (SACs) with atomically dispersed active sites, have gained attention for their potential as alternatives. This review summarizes recent advancements in the utilization of transition metal-based SACs in fuel cells and highlights strategies to enhance their performance and durability. SACs show promise as cathode electrocatalysts in low-temperature fuel cells.
Article
Chemistry, Physical
Yuebing Wang, Guanghua Tan, Qingfeng Yi, Can Fang, Ruowei Yi
Summary: With the growth of the energy crisis, the proton-exchange membrane fuel cell (PEMFC) is gaining attention as a green energy source. Researchers have synthesized a low Pt-loading carbon-based catalyst (pCN@NHCS-Fe/Pt-280) with hollow carbon spheres (HCSs), metal-organic frameworks (MOFs), and carbon nanotubes (CNTs) structure. This catalyst shows comparable performance to the benchmark Pt/C catalyst, demonstrating its potential for the development of low-Pt-loaded oxygen reduction reaction (ORR) catalysts.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jianmin Yu, Chenliang Su, Lu Shang, Tierui Zhang
Summary: This perspective first reviews the recent progress of single-atom catalysts (SACs) with optimized oxygen reduction reaction (ORR) catalytic activity, then summarizes the possible degradation mechanisms of SACs in the ORR process and effective strategies for improving their durability, and finally proposes some challenges and opportunities for developing stable single-atom-based ORR electrocatalysts in the future.
Article
Chemistry, Physical
Ye Peng, Ja-Yeon Choi, Liliang Tian, Kyoung Bai, Yi Zhang, Dongchu Chen, Jianhuang Zeng, Dustin Banham
Summary: The distribution of platinum group metal (PGM) nanoparticle catalysts in the carbon support significantly affects the catalyst's performance. The placement of Pt either on the outer surface or within the pores of the carbon results in different activity and performance at high current densities. To gain further insight into the catalyst's properties, a relationship between Pt distribution and relative humidity (RH) tolerance is explored. This work provides valuable information for MEA designers in selecting catalysts for specific applications.
JOURNAL OF POWER SOURCES
(2022)
Review
Chemistry, Applied
Yanqiu Wang, Jiayu Hao, Yang Liu, Min Liu, Kuang Sheng, Yue Wang, Jun Yang, Jie Li, Wenzhang Li
Summary: Developing high performance and low-cost catalysts for oxygen reduction reaction (ORR) in challenging acid condition is vital for proton-exchange-membrane fuel cells (PEMFCs). Carbon-supported non-precious metal single atom catalysts (SACs) have been identified as potential catalysts in the field. However, the ORR performance of SACs is still unsatisfactory. Importantly, microenvironment adjustment of SACs offers the chance to promote the performance of acid ORR.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Review
Chemistry, Multidisciplinary
Zhuo Hao, Yangyang Ma, Yisong Chen, Pei Fu, Pengyu Wang
Summary: This paper systematically reviews the recent advances of single-atom catalysts (SACs) and double-atom catalysts (DACs) in the cathode ORR of PEMFCs, with emphasis on the synthesis methods and ORR performance of the catalysts. Challenges and prospects for further advancing non-noble metal catalysts in PEMFCs are provided.
Article
Chemistry, Physical
Quentin Meyer, Shiyang Liu, Yibing Li, Chuan Zhao
Summary: This study reveals that high-performance Fe-N-C catalysts have slower proton transport and oxygen reduction reaction kinetics compared to commercial Pt catalysts in hydrogen fuel cells. This is due to the limited active site accessibility caused by the Fe-N-C nanoporous carbon matrix. Moreover, increasing the mass loading of Fe-N-C catalysts enhances the power density in hydrogen fuel cells but slows down proton transport and oxygen reduction reaction kinetics by lengthening the pathways to the active sites.
JOURNAL OF POWER SOURCES
(2022)
Review
Chemistry, Physical
Shuang Cao, Tong Sun, Jin-Rong Li, Qin-Zhu Li, Chun-Chao Hou, Qi Sun
Summary: This review highlights the recent development of ORR catalysts in proton exchange membrane fuel cells (PEMFCs) and emphasizes the importance of designing efficient catalysts at the membrane electrode assembly (MEA) and full-cell levels.
Article
Biochemistry & Molecular Biology
Su-Jeong Bak, Sun- Kim, Su-yeong Lim, Taehyo Kim, Se-Hun Kwon, Duck Hyun Lee
Summary: The study demonstrated highly efficient oxygen reduction catalysts composed of uniform Pt nanoparticles on small, reduced graphene oxides (srGO). The catalysts exhibited efficient surface reactions, large surface areas, high metal dispersions, and excellent oxygen reduction performance. Detailed investigations suggested that the chemical functionality and electrical conductivity greatly influenced the enhanced oxygen reduction efficiency of the catalysts.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Physical
Zijun Hu, Song Lu, Fumin Tang, Daijun Yang, Cunman Zhang, Qiangfeng Xiao, Pingwen Ming
Summary: Anion exchange membrane-based direct ammonia fuel cells (AEM-DAFCs) have attracted attention due to the advantages of ammonia. However, high Pt loading in the anode limits their practical implementation. In this study, Ni4Cu1Cox (x = 0, 0.5, 1.0, 1.5 and 2.0)-BP catalysts were prepared and the best ammonia oxidation reaction (AOR) performance was achieved at x = 1.5. The AEM-DAFC based on Ni4Cu1Co1.5-BP anode showed the highest peak power density (PPD) among precious metal-free electrodes-based AEM-DAFCs, making it a promising candidate for anode catalyst in AEM-DAFCs.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Kang Hua, Zhiyan Rui, Tianren Zhang, Yinliang Cao, Xinlong Shen, Shengping Wang, Ping He, Jia Li, Jianguo Liu
Summary: The three main problems related to JM-Pt/C catalysts for proton exchange membrane fuel cells are lack of catalytic performance, short life, and high cost. This study reports the synthesis of Pt3Co/NC alloy catalysts, which exhibit excellent ORR catalytic performance and structural stability with negligible performance loss. The introduction of cheap transition metals improves catalytic performance while significantly reducing the cost of the catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Chun Ouyang, Damao Xun, Gang Jian
Summary: N-doping and sulfonation were used to prepare PtNi nanoparticles supported on reduced graphene oxide (rGO) through hydrothermal synthesis and thermal decomposition. The specific surface area and catalytic stability of the PtNi/S-(N)rGO catalyst were improved by the anchoring effect of sulfonated groups and evenly distribution of nanoparticles, respectively. The synergistic effect of N-doping and sulfonation led to an increase in catalytic efficiency through an increase in the number of electron transfer.
Article
Chemistry, Physical
Jaana Lilloja, Elo Kibena-Poldsepp, Ave Sarapuu, Maike Kaarik, Jekaterina Kozlova, Paarn Paiste, Arvo Kikas, Alexey Treshchalov, Jaan Leis, Aile Tamm, Vambola Kisand, Steven Holdcroft, Kaido Tammeveski
Summary: Transition metal-and nitrogen-doped mesoporous carbons were prepared, characterised, and utilized as ORR electrocatalysts in an AEMFC. Fe-N-MPC, CoFe-N-MPC and FeMn-N-MPC showed the best performance and excellent stability in alkaline solution, with Fe-N-MPC and FeMn-N-MPC exhibiting the lowest HO2- yield. FeMn-N-MPC and Fe-N-MPC reached power densities of 474 and 473 mW cm-2 in the AEMFC.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Materials Science, Multidisciplinary
Hengbo Xiao, Kai Chi, Hongxia Yin, Xiangji Zhou, Pengxiang Lei, Peizhi Liu, Jiakun Fang, Xiuhong Li, Songliu Yuan, Zhen Zhang, Yaqiong Su, Junjie Guo, Lihua Qian
Summary: Oxygen vacancies in transition metal oxides can be used to modulate surface reconstruction for enhancing the oxygen evolution reaction (OER). In this study, oxygen vacancies were specifically localized within MoO4 tetrahedrons rather than CoO6 octahedrons in the CoMoO4 catalyst, resulting in the coherent reconstruction of CoO6 octahedrons into pure CoOOH with tunable OER activities. The manipulated distorted polyhedrons facilitated the complete transformation of CoO6 octahedrons into pure CoOOH at lower potentials, leading to a significantly improved intrinsic activity for OER.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Qian Yan, Jiakui Yan, Jinhao Zhou, Bo Zhao, Junjie Guo, Fei Chen, Jie Li, Hua Wang
Summary: Fine tuning the energy gaps and enhancing the fluorescence efficiencies of red emitters are highly desired. By changing the molecular symmetry from D-A-D to D-A structures, red fluorescent emitters with TPA donor and DCPP acceptor exhibited increased fluorescence quantum yield. The emitting color could also be precisely controlled depending on the aggregation state.
Article
Chemistry, Physical
Zhen Zhang, Zhiqiang Wang, Hang Zhang, Zikuan Zhang, Jingwei Zhou, Ying Hou, Peizhi Liu, Bingshe Xu, Haixia Zhang, Junjie Guo
Summary: Transition metal hydroxide heterostructures, such as the Co(OH)(2)/La(OH)(3)@Cu NWs, have been developed as efficient catalysts for electrocatalytic water splitting with low overpotentials and good stability. These heterostructure catalysts exhibit outstanding hydrogen evolution reaction (HER) activities with an ultralow overpotential of 36 mV at 10 mA cm(-2) and excellent alkaline oxygen evolution reaction (OER) performance with an overpotential of 273 mV at 100 mA cm(-2). The electrolytic cell using the CH/LH@Cu NW catalyst as the anode and cathode requires only 1.56 V to achieve a current density of 20 mA cm(-2) and demonstrates preferable long-term stability.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Jing Wang, Bingxin Guo, Junting Sun, Yingshuang Zhou, Chengfei Zhao, Zhongzhe Wei, Junjie Guo
Summary: The design and construction of electrocatalysts with multiple components is an effective strategy to achieve Pt-like activity for hydrogen generation. In this study, a novel CuRu-based electrocatalyst (RuCuOx/NC) is established using dual-templates assembling and pyrolysis protocol, followed by hot-alkali corrosion. The RuCuOx/NC shows excellent activity and stability under alkaline conditions, providing Pt-like activity with an overpotential of around 29 mV to reach 10 mA cm(-2) in 1 M KOH. The synergistic effect of Cu2+1O (with copper excess defects) and Ru accelerates H2O dissociation and optimizes hydrogen adsorption. This work proposes a promising methodology to construct multi-components electrocatalysts for renewable energy systems.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Guangda Zhou, Xiaoli Yan, Tianyu Zhang, Kui Wang, Jingtao Zhang, Junjie Guo
Summary: In this study, a novel nanocapsules with cobalt core and nitrogen-doped carbon shells (Co@NC) supported on MOFs-derived hierarchical porous carbon framework was reported. The hierarchical porous carbon framework with controllable size and micropore/mesoporous ratio was achieved by one-step pyrolysis. The 0.4Co@NC-900 electrocatalyst shows excellent oxygen reduction reaction (ORR) activity in the pH-universal range.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Jingwei Zhou, Zhen Zhang, Qiheng Wang, Mao Mao, Haixia Zhang, Ying Hou, Junjie Guo
Summary: Constructing heterostructured electrode materials is a promising strategy for improving the performance of supercapacitors. In this study, novel nanoarrays with Cu(OH)2 nanorod cores and nickel oxalate shells were grown on copper foam as electrode materials for boosting the performance of supercapacitors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Junting Sun, Qindong Zhang, Yatao Chang, Jing Wang, Bin Lu, Junjie Guo
Summary: A facile strategy to enhance the performance of porous carbon based hybrid electrocatalysts is proposed, by extracting cobalt within the carbon layers through catalyzing the growth of nitrogen-doped carbon nanotubes (NCNTs). The obtained Co-catalyzed NCNTs possess enhanced stability and optimized catalytic activity, making them applicable for oxygen reduction reaction (ORR) and zinc-air batteries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Huifeng Tian, Yinhang Ma, Zhenjiang Li, Mouyang Cheng, Shoucong Ning, Erxun Han, Mingquan Xu, Peng-Fei Zhang, Kexiang Zhao, Ruijie Li, Yuting Zou, PeiChi Liao, Shulei Yu, Xiaomei Li, Jianlin Wang, Shizhuo Liu, Yifei Li, Xinyu Huang, Zhixin Yao, Dongdong Ding, Junjie Guo, Yuan Huang, Jianming Lu, Yuyan Han, Zhaosheng Wang, Zhi Gang Cheng, Junjiang Liu, Zhi Xu, Kaihui Liu, Peng Gao, Ying Jiang, Li Lin, Xiaoxu Zhao, Lifen Wang, Xuedong Bai, Wangyang Fu, Jie-Yu Wang, Maozhi Li, Ting Lei, Yanfeng Zhang, Yanglong Hou, Jian Pei, Stephen J. Pennycook, Enge Wang, Ji Chen, Wu Zhou, Lei Liu
Summary: By varying the growth temperatures, the degree of disorder and electrical conductivity of amorphous carbon films can be tuned, revealing the causal link between microstructures and macroscopic properties of amorphous materials.
Article
Chemistry, Physical
Bingxin Guo, Chengfei Zhao, Yingshuang Zhou, Junjie Guo, Zhongzhe Wei, Jing Wang
Summary: Alkali metals are used to control the valence, size, and dispersion of Ru NPs in a pH-universal hydrogen evolution catalyst. The alkali metal additives contribute to the dispersion and stabilization of metallic Ru, and the interaction between Na and Ru regulates the distribution of Ru valence states. Additionally, NaCl acts as a template to promote mass transfer and expose more active sites, further enhancing the catalytic performance of Ru.
Article
Chemistry, Physical
Tianyu Zhang, Xiaoli Yan, Guangda Zhou, Kui Wang, Jingtao Zhang, Hua Zhang, Junjie Guo
Summary: Optimizing the electronic structure of Pt-Fe alloys supported on carbon onions is important for improving hydrogen evolution reaction (HER) activity in pH-universal electrolytes. The Pt0.5Fe0.5@CNOs catalyst exhibits outstanding HER performance and enduring stability in various pH electrolytes, due to its suitable proton adsorption and water dissociation processes. The optimal electronic structure and improved wettability offer new insights for developing pH-universal Pt-based HER catalysts.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Qiheng Wang, Haojie Liang, Jingwei Zhou, Jingkun Wang, Zhuang Ye, Min Zhao, Huimin Yang, Yanhui Song, Junjie Guo
Summary: Introducing heterometals into Pt/C catalyst to construct multi-metal catalyst is a rational strategy that can optimize the over-strong *O adsorption of Pt nanoparticles for oxygen reduction reaction (ORR). The constructed Pt-Fe-NG structure by atomic layer deposition shows outstanding ORR performance, with a half-wave potential of 0.948 V, a total four-electron pathway, and superior durability over 10,000 cycles. The Fe bridging atoms in the structure play a crucial role in enhancing the interaction between Pt nanoparticles and carbon support.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Hang Zhang, Zikuan Zhang, Zhen Zhang, Yongfeng Li, Ying Hou, Peizhi Liu, Bingshe Xu, Haixia Zhang, Yanzhen Liu, Junjie Guo
Summary: We have successfully synthesized a novel hybrid catalyst (FePc-NHCS-500) by coupling dispersed FePc molecule clusters into defect-rich nitrogen-doped hollow porous carbon spheres (NHCS). The well dispersed ultrasmall FePc molecule clusters exhibit excellent ORR performance due to the confining effect of mesopores in the NHCS. Moreover, the assembled Zn-air battery using FePc-NHCS-500 as air electrode shows excellent performance with an open circuit voltage (OCV) of 1.524 V, peak-power density of 230 mW cm-2, and specific capacity of 808.7 mAh g-1.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Qian Yan, Runhua Yao, Guozheng Li, Junjie Guo, Bo Zhao, Jie Li, Ruiqiang Hang, Hua Wang
Summary: In this study, two red emitters TPA-QxPy and Cz-Ph-QxPy with aggregation-induced emission characteristics were designed and synthesized. TPA-QxPy showed a strong charge transfer state, while Cz-Ph-QxPy had intramolecular hydrogen bonds to form hybridized local and charge-transfer state. Cz-Ph-QxPy-based organic light-emitting diode achieved highly efficient red emission with external quantum efficiency of 7.56% at 580 nm.
Article
Energy & Fuels
Mao Mao, Qing Chen, Haixia Zhang, Ying Hou, Junjie Guo
Summary: In the field of energy storage systems, hybrid supercapacitors show great potential in bridging the performance gap between traditional capacitors and lithium ion batteries. A novel composite material based on Nickel oxalate (NiC2O4), reduced graphene oxide (rGO), and nickel foam (NF) has been developed for battery-type supercapacitors, which exhibits significantly improved electrochemical properties.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Multidisciplinary
Xudong Jin, Yanqin Miao, Jianhua Dong, Jingkun Wang, Qiqing Lu, Min Zhao, Bingshe Xu, Junjie Guo
Summary: This study demonstrates that using 4-dodecylbenzene sulfonic acid (DBSA) as a surface ligand for CsPbBr3 perovskite nanocrystals (PeNCs) can reduce the trap state density, improve the photoluminescence quantum yield, increase the yield production, and enhance the stability compared to conventional octanoic acid (OTAc) capped PeNCs. PeLEDs based on DBSA-PeNCs achieve a higher external quantum efficiency (EQE) and maximum luminance compared to OTAc-PeNCs based PeLEDs. Therefore, introducing DBSA as a surface ligand is an effective way to realize highly efficient PeLEDs.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
