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Ramulu, Bhimanaboina,Nagaraju, Goli,Chandra Sekhar, S.,Hussain, Sk. Khaja,Narsimulu, D.,Yu, Jae Su American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.44
<P>Designing binder-free and core-shell-like electrode materials with synergistic effects has attracted widespread attention for the development of high energy density hybrid supercapacitors (HSCs). Herein, binder-free cobalt molybdate nanosheet-laminated cobalt phosphate micropetals on nickel foam (CoM NS@CoP/NF) were facilely prepared for use as an effective battery-type electrode in HSCs. With the multifunctional features, the rationally combined core-shell-like CoM NS@CoP/NF electrode exhibited a maximum capacity of 886.8 μA h/cm<SUP>2</SUP> at a current density of 5 mA/cm<SUP>2</SUP> with a good rate capability of 64.2% and cycling stability of 87.4% (after 10 000 cycles). The high electrochemical performance of the hybrid composite could be attributed to the synergistic effects of hierarchical architectures and large accessible electroactive area, which facilitates the fast electron/transportation within the active material and accelerates the redox chemistry process. Utilizing the superior energy-storage properties, a pouch-type HSC was fabricated with core-shell-like CoM NS@CoP-6 h architectures as a battery-type electrode and activated carbon as a capacitive-type electrode in an aqueous alkaline electrolyte. The miniature hybrid device exhibited maximum energy and power densities of 0.44 mW h/cm<SUP>2</SUP> and 40.35 mW/cm<SUP>2</SUP>, respectively, with good cycling stability. Moreover, the HSCs can energize various portable electronic equipments, which demonstrates their suitability for real-time applications.</P> [FIG OMISSION]</BR>
( Seetha Ramulu J. ),( Raja Gopal Reddy C. ),( R. Ramanjaneyulu ) 한국잠사학회 2010 International Journal of Industrial Entomology Vol.20 No.1
The studies have been conducted to control the soil borne fungal pathogens viz, Fusarium solani (Mart) Sacc. and Alternaria tenuissima the incitants of root rot and die-back diseases on mulberry stem cuttings planted in the mulberry nurseries and also in established mulberry gardens ten plant extracts with 10% concentration except Lantana camara (undiluted) were tested through poisoned food technique and four biofungicides were also screened by dual culture method under in vitro conditions. Plant extract of Prosopis juliflora showed the maximum inhibition on the mycelial growth (81.2% over A. tenuissima and 80.0% over F. solani) and followed by L. camara (66.7% over A. tenuissima and 68.9% over F. solani). Among the antagonists Pseudomonas fluorescens and Trichoderma viride showed maximum inhibition on the mycelial growth of both pathogenic fungi. The promising plant extracts (P. juliflora and L. camara) and antagonists (P. fluorescens and T. viride) were tested against both the pathogenic fungi under in vivo conditions along with the existing popular chemical Mancozeb. All the tested plant products and bio-fungicides showed inhibitory effect on both fungi. But the maximum survival percentage of mulberry cuttings was recorded in the treatment with T. viride (95% against F. solani and 90% against A. tenuisssima) followed by P. fluorescens (90% against both fungi) and T. harzianum (80% against F. solani and 85% against A. tenuisssima). Incase of the treatments with plant extracts and chemical fungicide the P. juliflora (60% against F. solani and 55% against A. tenuisssima) showed higher survival percentage and followed by L. camara (55% against F. solani and 50% against A. tenuisssima) and Mancozeb (55% against both fungi). In case of control only 10% of survival was recorded in F. solani inoculated cuttings and 15% survival in A. tenuissima inoculated cuttings.
슈퍼커패시터 전극을 위한 니켈-몰리브덴 황화물 나노구조의 합성 및 전기화학적 특성 분석
Bhimanaboina Ramulu,S. Chandra Sekhar,Shaik Junied Arbaz,유재수 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
최근 빠른 충방전 능력, 긴 사이클링 안정성 등의 우수한 특성을 갖는 슈퍼커패시터에 대한 관심이 증가하고 있다. 본 발표에서는 화학적 안정성, 저비용 및 향상된 전기화학적 성능을 가지는 니켈 몰리브데이트를 효율적인 전극제작을 위해 연구하였다. 인, 질소, 붕소 및 황과 같은 이종원자를 사용한 도핑공정은 호스트 물질의 전자상태를 효율적으로 조정하고 표면 wettability를 개선하며 활성결함을 생성할 수 있다. 여기서 수열합성법으로 니켈-몰리브덴 옥시-인화물과 옥시-황화물을 합성한 후 음이온 교환공정을 진행하여 전하수송을 촉진하는 나노구조를 형성하여 슈퍼커패시트 전극 제작을 통해 전기화학적 특성을 조사하였다.
금속몰리브데이트 초박형 나노시트기반 에너지 저장소자 제작 연구
Bhimanaboina Ramulu,S. Chandra Sekhar,Shaik Junied Arbaz,유재수 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 발표에서 자립형 나노구조 전극재료의 합리적인 설계는 높은 전력밀도를 가진 에너지 저장소자인 슈퍼커패시터의 전기화학적 성능을 향상시키는 효과적인 접근 방식이다. 여기에서는 단일 단계 용매 열공정을 통해 구리 폼에서 직접 성장한 금속몰리브데이트 초박형 나노시트의 손쉬운 합성을 설명한다. 제작된 샘플의 전기화학적 특성이 분석되었다.
Protein immobilization onto electrochemically synthesized CoFe nanowires
Torati, Sri Ramulu,Reddy, Venu,Yoon, Seok Soo,Kim, CheolGi Dove Medical Press 2015 INTERNATIONAL JOURNAL OF NANOMEDICINE Vol.10 No.-
<P>CoFe nanowires have been synthesized by the electrodeposition technique into the pores of a polycarbonate membrane with a nominal pore diameter of 50 nm, and the composition of CoFe nanowires varying by changing the source concentration of iron. The synthesized nanowire surfaces were functionalized with amine groups by treatment with aminopropyltriethoxysilane (APTES) linker, and then conjugated with streptavidin-Cy3 protein via ethyl (dimethylaminopropyl) carbodiimide and <I>N</I>-hydroxysuccinimide coupling chemistry. The oxide surface of CoFe nanowire is easily modified with aminopropyltriethoxysilane to form an amine terminating group, which is covalently bonded to streptavidin-Cy3 protein. The physicochemical properties of the nanowires were analyzed through different characterization techniques such as scanning electron microscope, energy dispersive spectroscopy, and vibrating sample magnetometer. Fluorescence microscopic studies and Fourier transform infrared studies confirmed the immobilization of protein on the nanowire surface. In addition, the transmission electron microscope analysis reveals the thin protein layer which is around 12–15 nm on the nanowire surfaces.</P>
Bhagwan, Jai,Nagaraju, Goli,Ramulu, Bhimanaboina,Yu, Jae Su Electrochemical Society 2019 Journal of the Electrochemical Society Vol.166 No.2
<P>ZnCo<SUB>2</SUB>O<SUB>4</SUB> (ZCO) hexagonal nanoplates were synthesized by a facile, robust and cost-effective co-precipitation method. The as-synthesized nanoplates were utilized as an electrode material and their electrochemical properties were investigated in three-electrode and two-electrode configurations with aqueous electrolyte of 1 M KOH. The fabricated ZCO electrode materials exhibited a specific capacity of 37 mAh g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP>. The capacity of the pristine ZCO nanoplates was further improved by incorporating multiwall carbon nanotubes (MWCNTs). The MWCNT@ZCO showed a specific capacity of 64 mAh g<SUP>−1</SUP> at 1 A g<SUP>−1</SUP>. To examine practical performances, asymmetric supercapacitor (ASC) was also fabricated using MWCNT@ZCO as a positive electrode and activated carbon as a negative electrode. The specific capacity of the ASC was found to be 17 mAh g<SUP>−1</SUP> at 0.38 A g<SUP>−1</SUP>. ASC could store sufficient energy to power a parallel combination of two red color light-emitting diodes. These findings may open new opportunities for the design of effective, stable, and easily recyclable ZCO electrode material for energy storage devices.</P>