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PGM-Free Oxygen-Reduction Catalyst Development for Proton-Exchange Membrane Fuel Cells:Challenges,Solutions,and Promises

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Accounts of Materials Research 2022年第2期3卷 224-236页

作者： yanghua he Gang Wu Department of Chemical and Biological Engineering University at BuffaloThe State University of New YorkBuffaloNew York 14260United States

CONSPECTUS:Proton-exchange membrane fuel cells(PEMFCs)are efficient and clean hydrogen energy technologies for transportation and stationary *** active and durable low-cost cathode catalysts for the oxygen-reduction reaction(ORR)under challenging acidic environments are desperately needed to address the cost and durability issues of *** most promising platinum group metal(PGM)-free catalysts for the ORR in acidic media are atomically dispersed and nitrogencoordinated metal site catalysts denoted as M−N−C,M=Fe,Co,or *** to significant efforts in the past few decades,these catalysts have demonstrated much-improved ORR activity and promising initial fuel cell performance approaching traditional Pt/C ***,the insufficient long-term stability(up to 5000 h)under PEMFC operation represents a primary technical barrier to making current PGM-free catalysts less viable yet in *** this Account,we highlight recent advances in synthesizing efficient PGM-free catalysts for the ORR in PEMFCs,emphasizing effective strategies to improve mass and intrinsic activity and the possible degradation *** particular,a chemical doping method based on the zeolitic imidazolate framework(ZIF)-8 represents the key to developing efficient M−N−C catalysts containing atomically dispersed and nitrogen-coordinated single metal active sites(i.e.,MN_(4)).The newly acquired understanding of the formation mechanism of MN_(4)active sites during the thermal activation and its correlation to catalytic properties guide the rational catalyst design rather than relying on current trial-and-error *** efforts have further been invested in increasing the active site density and enhancing intrinsic activity by regulating carbon-phase structures and the local coordination *** highly active catalysts usually suffer from significant activity loss during the ***,breaking the activity−stability trade-off is the key to simul

关键词： catalyst Oxygen durability

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Diet induced the change of mtDNA copy number and metabolism in Angus cattle

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Journal of Animal Science and Biotechnology 2021年第1期12卷 172-184页

作者： Ying Bai José A.Carrillo Yaokun Li yanghua he Jiuzhou Song College of Life Sciences and Food Engineering Hebei University of EngineeringHandan 056038China .2Department of Animal&Avian Sciences University of MarylandCollege ParkMD 20742USA Council on Dairy Cattle Breeding BowieMD 20716USA .4Human Nutrition Food and Animal SciencesUniversity of Hawaii at ManoaHonoluluHI 96822USA.

Background: Grass-fed and grain-fed Angus cattle differ in the diet regimes. However, the intricate mechanisms of different beef quality and other phenotypes induced by diet differences are still unclear. Diet affects mitochondrial function and dynamic behavior in response to changes in energy demand and supply. In this study, we examined the mtDNA copy number, mitochondria-related genes expression, and metabolic biomarkers in grass-fed and grainfed Angus ***: We found that the grass-fed group had a higher mtDNA copy number than the grain-fed group. Among different tissues, the mtDNA copy number was the highest in the liver than muscle, rumen, and spleen. Based on the transcriptome of the four tissues, a lower expression of mtDNA-encoded genes in the grass-fed group compared to the grain-fed group was discovered. For the mitochondria-related nuclear genes, however, most of them were significantly down-regulated in the muscle of the grass-fed group and up-regulated in the other three tissues. In which, COX6 A2, POLG2, PPIF, DCN, and NDUFA12, involving in ATP synthesis, mitochondrial replication,transcription, and maintenance, might contribute to the alterations of mtDNA copy number and gene ***, 40 and 23 metabolic biomarkers were identified in the blood and muscle of the grain-fed group compared to a grass-fed group, respectively. Integrated analysis of the altered metabolites and gene expression revealed the high expression level of MDH1 in the grain-fed group might contribute to the mitochondrial NADH oxidation and spermidine metabolism for adapting the deletion mtDNA copy ***: Overall, the study may provide further deep insight into the adaptive and regulatory modulations of the mitochondrial function in response to different feeding systems in Angus cattle.

关键词： Beef quality Different diet Gene expression Metabolism MtDNA

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Into the “secret” double layer: Alkali cation mediates the hydrogen evolution reaction in basic medium

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Journal of Energy Chemistry 2020年第12期29卷 101-104页

作者： Fanan Wang Gang Xu yanghua he Zhipeng Liu Zhigang Zhang Qing Mao Yanqiang Huang School of Ecological Environment and Urban Construction Fujian University of TechnologyFuzhou 350118FujianChina State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Fujian Key Laboratory of Polymer Materials College of Chemistry and Materials ScienceFujian Normal University.Fuzhou 350007FujianChina School of Chemical Engineering Dalian University of TechnologyDalian 116024LiaoningChina Fujian Eco-materials Engineering Research Center Fujian University of TechnologyFuzhou 350118FujianChina

The hydrogen evolution reaction(heR) – as an essential half reaction in water electrolysis and chlor-alkali process has been well studied in acidic electrolyte, but much less has been known in basic medium. In this study, by combining kinetic modeling and electrochemical measurements, we show that hydrated alkali cation clusters can adsorb on the surface of heR catalyst in basic electrolyte. The bound H2 O molecules in the "clusters" can thus be in-situ activated through the hydration effect, which dissociate on the catalyst surface as the reactant of heR. The effective concentration and hydration energy of alkali cation can influence the H2 O dissociation rate, and hence the kinetics of heR. Our work demonstrates a new understanding of the heR mechanism in basic reaction electrolyte.

关键词： heR Alkaline Mechanism Hydration Alkaline cation

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Revealing the dynamics of the alloying and segregation of Pt-Co nanoparticles via in-situ environmental transmission electron microscopy

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Nano Research 2023年第2期16卷 3055-3062页

作者： Xing Li Shaobo Cheng yanghua he Lixiang Qian Dmitri Zakharov Gang Wu Chongxin Shan Liang Zhang Dong Su henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNY 11973USA Department of Chemical and Biological Engineering University at BuffaloThe State University of New YorkBuffaloNY 14260USA Center for Combustion Energy School of Vehicle and MobilityTsinghua UniversityBeijing 100084China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Thermal treatment is a general and efficient way to synthesize intermetallic catalysts and may involve complicated physical *** far,the mechanisms leading to the size and composition heterogeneity,as well as the phase segregation behavior in Pt-Co nanoparticles(NPs)are still not well *** in-situ environmental transmission electron microscopy,the formation dynamics and segregation behaviors of Pt-Co alloyed NPs during the thermal treatment were *** is found that Pt-Co NPs on zeolitic imidazolate frameworks-67-derived nanocarbon(NC)are formed consecutively through both particle migration coalescence and the Ostwald ripening *** existence of Pt NPs is found to affect the movement of Co NPs during their *** the help of theoretical calculations,the correlations between the composition and migration of the Pt and Co during the ripening process were *** complex alloying processes are revealed as key factors leading to the heterogeneity of the synthesized Pt-Co alloyed *** oxidation environment,the Pt-Co NPs become surface faceted gradually,which can be attributed to the oxygen facilitated relatively higher segregation rate of Co from the(111)*** work advances the fundamental understanding of design,synthesis,and durability of the Pt-based nanocatalysts.

关键词： intermetallic catalyst alloying ripening segregation dynamics environmental transmission electron microscopy(ETEM)

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Novel SNPs in IL-17F and IL-17A genes associated with somatic cell count in Chinese Holstein and Inner-Mongolia Sanhe cattle

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Journal of Animal Science and Biotechnology 2017年第2期8卷 361-369页

作者： Tahir Usman Yachun Wang Chao Liu yanghua he Xiao Wang Yichun Dong Hongjun Wu Airong Liu Ying Yu Key Laboratory of Animal Genetics Breeding and Reproduction Ministry of Agriculture of China National Engineering Laboratory for Animal BreedingCollege of Animal Science and Technology China Agricultural UniversityBeijing 100193 People's Republic of China College of Veterinary Sciences and Animal Husbandry Abdul Wali Khan University MardanMardan 23200Pakistan. Xieerltala Breeding Farm Hailaer 021012 Inner Mongolia China. Agricultural and Animal Husbandry Administration Bureau Hailaer 021000Inner Mongolia China.

Background： Bovine mastitis is the most common and costly disease of lactating cattle worldwide. Apart from milk somatic cell count（SCC） and somatic cell score（SCS）, serum cytokines such as interleukin-17（IL-17） and interleukin-4（IL-4） may also be potential indicators for bovine mastitis. The present study was designed to investigate the effects of single nucleotide polymorphisms（SNPs） in bovine IL-17 F and IL-17 A genes on SCC, SCS and serum cytokines in Chinese Holstein and Inner-Mongolia Sanhe cattle, and to compare the m RNA expression variations of the cows with different ***： A total of 464 lactating cows（337 Holstein and 127 Inner-Mongolia Sanhe cattle） were screened for SNPs identification and the data were analyzed using fixed effects of herd, parity, season and year of calving by general linear model procedure. The results revealed that SNP g.24392436 C ＆gt; T in IL-17 F and SNP g.24345410 A ＆gt; G in IL-17 A showed significant effects on SCC and IL-4 in Holstein（n = 337） and on IL-17 and IL-4 in Sanhe cattle（n = 127）. The homozygous GG genotype of SNP g.24345410 A ＆gt; G had significantly higher m RNA expression compared with the heterozygous AG ***： The results indicate that IL-17 F and IL-17 A could be powerful candidate genes of mastitis resistance and the significant SNPs might be useful genetic markers against mastitis in both dairy and dual purpose cattle.

关键词： Chinese Holstein Inner Mongolia Sanhe cattle Interleukin 17A Interleukin 17F Mastitis susceptibility

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Genetic assessment of inbred chicken lines indicates genomic signatures of resistance to Marek's disease

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Journal of Animal Science and Biotechnology 2018年第4期9卷 803-812页

作者： Lingyang Xu yanghua he Yi Ding George E.Liu Huanmin Zhang Hans H.Cheng Robert L.Taylor Jr. Jiuzhou Song Department of Animal & Avian Sciences University of Maryland Animal Genomics and Improvement Laboratory U.S. Department of Agriculture-Agricultural Research Services Laboratory of Molecular Biology and Bovine Breeding Institute of Animal Science Chinese Academy of Agricultural Sciences United States Department of Agriculture-Agriculture Research Service (ARS) Avian Disease and Oncology Laboratory Animal and Nutritional Sciences Davis College of Agriculture West Virginia University

Background: Marek’s disease(MD) is a highly contagious pathogenic and oncogenic disease primarily affecting chickens. However, the mechanisms of genetic resistance for MD are complex and not fully understood. MD-resistant line 63and MD-susceptible line 72are two highly inbred progenitor lines of White Leghorn. Recombinant Congenic Strains(RCS) were developed from these two lines, which show varied susceptibility to ***: We investigated genetic structure and genomic signatures across the genome, including the line 63and line72, six RCSs, and two reciprocally crossed flocks between the lines 63and 72(F1 63× 72and F1 72× 63) using Affymetrix~? Axiom~? HD 600 K genotyping array. We observed 18 chickens from RCS lines were specifically clustered into resistance sub-groups distributed around line 63. Additionally, homozygosity analysis was employed to explore potential genetic components related to MD resistance, while runs of homozygosity(ROH) are regions of the genome where the identical haplotypes are inherited from each parent. We found several genes including SIK, SOX1, LIG4, SIK1 and TNFSF13B were contained in ROH region identified in resistant group(line 63and RCS), and these genes have been reported that are contribute to immunology and survival. Based on FSTbased population differential analysis, we also identified important genes related to cell death and anti-apoptosis, including AKT1, API5, CDH13, CFDP and USP15,which could be involved in divergent selection during inbreeding ***: Our findings offer valuable insights for understanding the genetic mechanism of resistance to MD and the identified genes could be considered as candidate biomarkers in further evaluation.

关键词： Genetic structure Genomic signature Homozygosity Marek's disease Recombinant Congenic Strains(RCS)

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In-situ carbonization approach for the binder-free Ir-dispersed ordered mesoporous carbon hydrogen evolution electrode

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Journal of Energy Chemistry 2017年第6期26卷 1140-1146页

作者： yanghua he Jinming Xu Fanan Wang Xiaochen Zhao Guangzhao Yin Qing Mao Yanqiang Huang Tao Zhang State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences School of Chemical Engineering Dalian University of Technology

A binder-free Ir-dispersed ordered mesoporous carbon（Ir-OMC） catalytic electrode has been prepared through a designed in-situ carbonization method, which involves coating resorcinol and formaldehyde mixtures with iridium precursors onto the three-dimensional nickel foam framework, followed by insitu calcination in Natmosphere at 800 ℃ for 3 h. This electrode shows a large surface area, ordered mesoporous structure and homogeneous distribution of metal nanoparticles. It presents good activity and stability towards hydrogen evolution reaction, which is attributed to the efficient mass and electron transport from the intimate contact among Ir nanoparticles, ordered mesoporous carbon matrix and 3 D conductive substrate. We hope that this in-situ carbonization synthetic route can also be applied to design more high-performance catalysts for water splitting, fuel cells and other clean energy devices.

关键词： In-situ carbonization Ordered mesoporous carbon heR

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Ni-Fe基析氧阳极材料的研究进展

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化工进展 2016年第7期35卷 2057-2062页

作者：何杨华徐金铭王发楠毛庆黄延强中国科学院大连化学物理研究所航天催化与新材料研究室辽宁大连116023 大连理工大学化工学院辽宁大连116024

寻找一种高效、稳定和低成本的析氧阳极材料对于在碱性环境中电解水的研究具有非常重要的实际意义。近年来,Ni-Fe基材料以其低成本及在碱性条件下具有高催化活性的特点成为析氧反应电极材料的研究热点。本文概述了近几年国内外学者对不... 详细信息

寻找一种高效、稳定和低成本的析氧阳极材料对于在碱性环境中电解水的研究具有非常重要的实际意义。近年来,Ni-Fe基材料以其低成本及在碱性条件下具有高催化活性的特点成为析氧反应电极材料的研究热点。本文概述了近几年国内外学者对不同的Ni-Fe基析氧材料(包括Ni-Fe合金、Ni-Fe氧化物、Ni-Fe层状双金属氢氧化物及Ni-Fe基复合材料等)在合成方法、物理形态、化学结构和催化性能等方面所进行的研究,介绍了Ni-Fe基材料的析氧反应机理的进展,探究了析氧反应活性相以及Fe的掺入对Ni基氢氧化物的结构和活性的影响,最后指出了合成方法的改进及详细反应机理的探究将会成为未来Ni-Fe基析氧阳极材料的重点研究方向。

关键词： Ni-Fe基材料催化剂电解析氧反应反应动力学

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新型陶瓷基片材料的研制

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中国陶瓷工业 2000年第1期7卷 1-8页

作者：顾幸勇吴中庆何样花景德镇陶瓷学院材料工程系 333001

本文用煅烧云南高岭土与碳酸钙 ,在加入合适的添加剂和在合理的烧成制度条件下 ,用一步法制备出性能优异的新型钙长石质陶瓷基片 ;在满足使用强度的条件下 ,与常用的氧化铝质陶瓷基片相比 ,钙长石质陶瓷基片的介电常数小 ,电绝缘性能好 ... 详细信息

本文用煅烧云南高岭土与碳酸钙 ,在加入合适的添加剂和在合理的烧成制度条件下 ,用一步法制备出性能优异的新型钙长石质陶瓷基片 ;在满足使用强度的条件下 ,与常用的氧化铝质陶瓷基片相比 ,钙长石质陶瓷基片的介电常数小 ,电绝缘性能好 ;热膨胀系数与集成电路中的硅元件的热膨胀系数相差小 ;体积密度轻 ,对减轻电器设备的质量有利 ;烧成温度比较低 ,原料价格低 ,有很好的经济效益。

关键词：钙长石陶瓷基片介电常数烧成电子陶瓷

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“双碳”背景下我国碳普惠发展历程与展望

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市场周刊 2023年第11期36卷 23-26页

作者：王文杰何杨华郝皓上海第二工业大学上海201209

中国自2020年提出“双碳”目标后,绿色与低碳便成了未来经济发展与生态建设的导向。作为重要的碳排放源之一,居民消费领域有着巨大的减排潜力。碳普惠是我国面向个人的自愿减排机制,为我国减碳提供了新思路。通过梳理我国碳普惠的发展现... 详细信息

中国自2020年提出“双碳”目标后,绿色与低碳便成了未来经济发展与生态建设的导向。作为重要的碳排放源之一,居民消费领域有着巨大的减排潜力。碳普惠是我国面向个人的自愿减排机制,为我国减碳提供了新思路。通过梳理我国碳普惠的发展现状,提出相关建议,以期碳普惠能更好地提升公众参与度,助力我国“双碳”目标的实现。

关键词：碳普惠自愿减排低碳

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