Article
Chemistry, Multidisciplinary
Ke Guo, Jinyu Zheng, Jianchun Bao, Yafei Li, Dongdong Xu
Summary: Surface modification of electrocatalysts is a key strategy for designing advanced nanocatalysts with improved electrocatalytic performance. This study develops highly dispersed amorphous molybdenum trisulfide-anchored Platinum nanodendrites (Pt-a-MoS3 NDs) as efficient hydrogen evolution electrocatalysts. The enhanced electrocatalytic activity of Pt catalysts is attributed to the highly dispersed a-MoS3, which acts as a preferred adsorption site for the efficient conversion of H+ to H2. Furthermore, the anchoring of highly dispersed clusters to Pt substrate significantly enhances the electrocatalytic stability.
Article
Materials Science, Multidisciplinary
Yeqing Xu, Xingxing Jiang, Gonglei Shao, Haiyan Xiang, Sisi Si, Xing Li, Travis Shihao Hu, Guo Hong, Shengyi Dong, Huimin Li, Yexin Feng, Song Liu
Summary: By engineering the interface between MoS2-based materials and supported substrates, a hybrid Ru-doped MoS2 on carbonized lignin is designed as an efficient catalyst for the hydrogen evolution reaction. The interfacial interaction between MoS2 and CL promotes electron transfer and increases active sites greatly for HER, leading to a low onset overpotential and Tafel slope. The study presents a prototype application to design electrocatalysts with enhanced carrier mobility and high-density active sites based on interface effect.
ENERGY & ENVIRONMENTAL MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Samar Batool, Marcel Langer, Stephen Nagaraju Myakala, Magdalena Heiland, Dominik Eder, Carsten Streb, Alexey Cherevan
Summary: This review summarizes prominent examples of thiomolybdate-based electro- and photocatalysis and provides a comprehensive analysis of their reactivities under homogeneous and heterogenized conditions. The study examines the active sites of thiomolybdates relevant for the hydrogen evolution reaction and discusses the shift from solution-phase to surface-supported thiomolybdates with a focus on applications in electrocatalysis and photocatalysis.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Aruna K. Kunhiraman, M. Bradha, R. Ajay Rakkesh
Summary: Ni-doped MoS2 synthesized by a facile solvothermal method exhibited superior electrocatalytic performance, with Ni2xMo1-xS2 at x = 0.05 showing the best efficiency and highest number of active sites. This enhanced performance is attributed to the synergistic effect of MoS2, NiS, and Ni3S4 leading to increased electronic modulation and active sites.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Debarati Ghosh, Monojit Ghosal Chowdhury, Rathindranath Biswas, Krishna Kanta Haldar, Amitava Patra
Summary: In this study, a nanocomposite containing europium molybdate and molybdenum disulfide was synthesized in situ for enhanced electrochemical hydrogen evolution reaction (HER). The nanoflower architecture of MoS2 coupled with flakes of europium molybdate was observed, leading to an enhanced surface area and improved HER activity. The fabrication of lanthanide-containing MoS2 nanocomposites shows promise for efficient electrocatalytic hydrogen generation.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Yan Wen, Cun-xin Li, Jie Wang, Yin-yin Qian, Feng-cui Shen
Summary: Advancements in non-noble-metal electrocatalysts have significantly influenced the production of renewable clean energy through sustainable hydrogen evolution reactions (HERs). In this study, a controlled catalyst P-CoMoO4@Ni with a hierarchical structure and different morphologies on the surface of nickel foam (NF) was successfully synthesized. The optimized nanoflower oxide array electrode P-CoMoO4@Ni-1 exhibited excellent performance as the best catalyst for HER, delivering high current densities under low overpotentials. Moreover, this work demonstrated the potential of catalyst arrays using polyoxometalates (POMs) as precursors to enhance electrocatalytic performance and provide fundamental research in HER at low potentials.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Zhen-Wei Wei, Hong-Juan Wang, Chao Zhang, Kun Xu, Xiu-Li Lu, Tong-Bu Lu
Summary: The study demonstrates that Pt nanoclusters supported on porous TiO2 nanosheets with rich oxygen vacancies exhibit significantly higher catalytic activity for the HER compared to those supported on TiO2 with deficient oxygen vacancies. This is attributed to the ability of the TiO2 support with rich oxygen vacancies to facilitate reversed charge transfer and enhanced hydrogen spillover, promoting proton reduction and hydrogen desorption at Pt catalytic sites. This work provides a new strategy for the rational design of highly efficient HER catalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Amr Elgendy, Athanasios A. Papaderakis, Conor Byrne, Zhaozong Sun, Jeppe Lauritsen, Elliot P. C. Higgins, Andinet Ejigu, Robert Cernik, Alex S. Walton, David J. Lewis, Robert A. W. Dryfe
Summary: This study presents a simple and efficient method for synthesizing nanoparticulate ternary Chevrel phases without using hydrogen gas as a reducing agent. The successful formation of Cu2Mo6S8 CP with homogeneous nanoscale structure was confirmed through various analyses. The synthesized CP exhibited promising electrocatalytic activity for hydrogen evolution reaction in acidic media, showing potential for applications in electrocatalysis.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Engineering, Environmental
Chen Li, Ruizhi Xu, Shuangxiu Ma, Yuhua Xie, Konggang Qu, Haifeng Bao, Weiwei Cai, Zehui Yang
Summary: This study achieved boosted NRR catalytic activity by creating sulfur vacancies in cobalt sulfide nanoflowers, which effectively suppressed competitive reactions such as HER and provided more active sites for nitrogen chemisorption, resulting in a higher ammonia yield rate.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Jiaxin Zhang, Sisi Li, Xiaohan Liu, Haoquan Zheng, Wei Zhang, Rui Cao
Summary: Interface engineering is used to improve the activity of catalysts in electrocatalytic oxygen evolution reaction (OER). In this study, Co3O4 supported on β-Mo2C with different interfaces were investigated. The strong interaction between Co3O4 nanoparticles and β-Mo2C nanobelts led to a compact interface, which enhanced the conductivity and promoted the charge transfer process during OER. The surface loading of Co3O4 improved the hydrophilicity of the material, while β-Mo2C had the capability to dissociate H2O molecules. This study demonstrates an example of interface engineering in electrocatalytic OER.
Article
Chemistry, Physical
Mengmeng Lao, Peng Li, Yinzhu Jiang, Hongge Pan, Shi Xue Dou, Wenping Sun
Summary: This article provides an in-depth review of the mechanism and theoretical understanding of alkaline hydrogen evolution reaction (HER), focusing on the role of interface chemistry in tailoring the intrinsic activity of electrocatalysts. The aim is to provide solid guidance for the rational design of advanced alkaline HER electrocatalysts for Anion Exchange Membrane Water Electrolyzers (AEMWEs).
Article
Chemistry, Physical
Jing Jiang, Xinzhi Wang, Xin Liang, Jiayi Zhang, Lunhong Ai
Summary: We report a robust multi-functional MoS2-MoP2 heterostructure formed on nickel foam (Mo-S-P/NF) to boost both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) in alkaline medium. The optimal Mo-S-P/NF exhibits excellent electrocatalytic performances with ultralow overpotentials of 202 mV for OER, 50 mV for HER as well as a low cell voltage of 1.56 V for overall water splitting at a current density of 10 mA cm(-2), along with outstanding long-term durability, owing to prominent superwetttability, abundant defective surface and unique heterointerface. Remarkably, the successful implementation of solar thermoelectricity-driven water electrolysis self-powered by the Mo-S-P/NF inspires its practical application in sustainable hydrogen production.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Lipipuspa Sahoo, Aarti Devi, Amitava Patra
Summary: The generation of green hydrogen through electrocatalytic water splitting is a promising approach for future energy devices. In this study, a water-soluble, atomically precise Ni nanocluster (NC)-modified MoSe2 nanosheet (NS) catalyst was developed to enhance the hydrogen evolution reaction (HER) performance. The Ni/MoSe2 nanocomposite exhibited significantly improved HER efficiency, with an overpotential of 170 mV @ 10 mA/cm2, compared to bare MoSe2 NSs (350 mV). The incorporation of Ni NCs accelerated the HER kinetics of MoSe2, as indicated by the lower Tafel slope and reduced charge-transfer resistance in the nanocomposite. This work highlights the potential of combining non-precious metal NCs and transition-metal dichalcogenides to design efficient and cost-effective electrocatalysts for HER.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Engineering, Environmental
Huili Zheng, Baoxin Ma, Yesi Shi, Qixuan Dai, Dongsheng Li, En Ren, Jing Zhu, Jianming Liu, Hu Chen, Zhenyu Yin, Chengchao Chu, Xiaomin Wang, Gang Liu
Summary: In this study, MoS2@GA-Fe nanosheets with high Fe(III) loading were prepared and demonstrated to function as a Fenton Nanoreactor in the tumor microenvironment. The reactive hydroxyl radicals were generated during the Fenton reaction, leading to enhanced antitumor efficiency and biosafety, showing promising potential for tumor therapy.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Yichao Huang, Wenbo Zhou, Weichao Kong, Lulu Chen, Xiaolong Lu, Hanqing Cai, Yongrui Yuan, Lianming Zhao, Yangyang Jiang, Haitao Li, Limin Wang, Lin Wang, Hang Wang, Jiangwei Zhang, Jing Gu, Zhuangjun Fan
Summary: A study reports an interfacial engineering strategy that regulates the nanostructure, electronic structure, and interfacial structure of Mo2N quantum dots on N-doped graphene via codoping with Al and O. This strategy enhances hydrophilicity, lowers energy barriers, and achieves remarkable alkaline hydrogen evolution reaction performance.
Article
Chemistry, Multidisciplinary
Dipankar Bain, Aarti Devi, Sikta Chakraborty, Amitava Patra
Summary: We designed a fluorescent probe, poly(allylamine) hydrochloride (PAH) functionalized copper nanocluster (Cu NC@PAH), for the selective detection of sulfide (S2-) ions in water. The probe showed a significant enhancement in photoluminescence (PL) intensity and quantum yield (QY) after functionalizing with the cationic polymer PAH. The probe also exhibited excellent selectivity and a reasonable quenching response for S2- ions, with a detection limit of 2.39 μM.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Raj Sekhar Roy, Sanjit Mondal, Samita Mishra, Maqsuma Banoo, Lipipuspa Sahoo, Amit Kumar, C. P. Vinod, Arijit K. De, Ujjal K. Gautam
Summary: A strategy for covalently linking adjacent layers of g-C3N4 using diethylene glycol as a precursor is introduced to achieve a high surface area in a one-step process. The introduced linkers provide mechanical stability and increase the efficiency of photocatalytic water-splitting.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Srijon Ghosh, Kritiman Marjit, Goutam Ghosh, Debarati Ghosh, Amitava Patra
Summary: This study investigates the photoinduced energy and electron transfer processes between quaterthiophene (QTH) and squaraine (SQR) dye in hybrid aggregates. The results show that energy transfer from QTH aggregates to SQR aggregates occurs within 120 fs, while electron transfer occurs at timescales of 131.5 ps and 3.3 ns, leading to the formation of a long-lived charge-separated state for more than 8 ns.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Goutam Ghosh, Kritiman Marjit, Srijon Ghosh, Amitava Patra
Summary: We investigate the fast hot-carrier (HC) relaxation and Auger recombination (AR) rates in hexapod CsPbBr3 NCs using ultrafast transient absorption (TA) spectroscopy. Our results show that hexapod CsPbBr3 has a prolonged HC cooling time and bi-exciton lifetime compared to cubic CsPbBr3. By employing the electron-phonon coupling model, we confirm the slower HC relaxation rate in hexapod CsPbBr3, suggesting a delayed decay of longitudinal optical (LO) phonons. We demonstrate that delocalization of charge carriers in shallow trap states leads to reduced overlap of electron and hole wave functions and suppresses the bi-exciton AR rate.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Sarita Kolay, Subarna Maity, Sikta Chakraborty, Srijon Ghosh, Amitava Patra
Summary: This work investigates the impact of substituent groups on the relaxation dynamics of atomically precise Ag44(SR)304- nanoclusters. The electronegativity and polarization of the surface ligands are found to control the electron-phonon interaction, affecting the population transfer within the nanoclusters upon photoexcitation. Transient absorption spectroscopic data analysis reveals a slower relaxation process from the core state to the surface state, depending on the electronegativity. The ligand-protected Ag44 nanoclusters exhibit fast internal conversion, core-to-surface relaxation, and slower electron-hole recombination.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Lipipuspa Sahoo, Aarti Devi, Amitava Patra
Summary: The generation of green hydrogen through electrocatalytic water splitting is a promising approach for future energy devices. In this study, a water-soluble, atomically precise Ni nanocluster (NC)-modified MoSe2 nanosheet (NS) catalyst was developed to enhance the hydrogen evolution reaction (HER) performance. The Ni/MoSe2 nanocomposite exhibited significantly improved HER efficiency, with an overpotential of 170 mV @ 10 mA/cm2, compared to bare MoSe2 NSs (350 mV). The incorporation of Ni NCs accelerated the HER kinetics of MoSe2, as indicated by the lower Tafel slope and reduced charge-transfer resistance in the nanocomposite. This work highlights the potential of combining non-precious metal NCs and transition-metal dichalcogenides to design efficient and cost-effective electrocatalysts for HER.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Kritiman Marjit, Goutam Ghosh, Srijon Ghosh, Debarati Ghosh, Anusri Medda, Amitava Patra
Summary: In this study, the electron transfer dynamics in the CsPbBr3-Au-144 cluster hybrid system were investigated using ultrafast transient absorption spectroscopy. The results showed faster hot carrier cooling time and a significant drop in hot carrier temperature, indicating hot electron transfer from CsPbBr3 nanocrystals to Au nanoclusters. Furthermore, a much faster hot electron transfer compared to band-edge electron transfer was observed, and a 45% hot-electron transfer efficiency was achieved at energy above the band-edge excitation. The significant enhancement of the photocurrent to the dark current ratio confirmed the charge separation via electron transfer in this hybrid system.
ACS PHYSICAL CHEMISTRY AU
(2023)
Article
Chemistry, Multidisciplinary
Anusri Medda, Soubhik Ghosh, Amitava Patra
Summary: Transition metal-doped two-dimensional semiconductor nanoplatelets (NPLs) have been synthesized and investigated, showing improved charge carrier separation and efficient performance as photodetectors.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Igor M. Goncalves, Anusri Medda, Alyson J. A. Carvalho, Ceciilia L. A. V. Campos, Soubhik Ghosh, Anderson S. L. Gomes, Amitava Patra
Summary: The nonlinear optical response of CdSe and CdSe/CdS core/shell nanoplatelets in toluene suspension was studied using Z-scan and optical Kerr gate techniques. The Z-scan analysis yielded nonlinear coefficients of n(2) = 1.4 x 10(-16) cm(2)/W and n(2) = 1.3 x 10(-16) cm(2)/W for CdSe and CdSe/CdS NPLs, respectively. The dominant behavior was fifth-order nonlinear absorption, with alpha(4) = 4.0 x 10(-2) cm/GW for CdSe NPLs and alpha(4) = 9.0 x 10(-3) cm/GW for CdSe/CdS NPLs. The results from Z-scan and optical Kerr gate were in good agreement, and the response time from OKG was less than 1 ps for all materials. NLA was observed for CdSe and CdSe/CdS NPLs but not for toluene, indicating that the presence of NPLs reduces the threshold of absorptive nonlinearity. The electronic structure of the materials was discussed to explain the results.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Antika Das, Kritiman Marjit, Srijon Ghosh, Debarati Ghosh, Amitava Patra
Summary: Lead halide perovskite nanocrystals (NCs) are advanced semiconductor materials for optoelectronic device development. Delaying the relaxation time of hot carriers (HCs) can enhance solar conversion efficiency. In this study, the surface of CsPbX3 (X = Br/Cl) NCs was treated with hexadecylamine (HDA) molecules, and femtosecond transient absorption spectroscopy was used to analyze the HC relaxation dynamics and ultrafast carrier dynamics. The results show faster ultrafast carrier relaxation with increasing Cl content in CsPbX3 NCs (X = Br/Cl). HDA-passivated CsPbX3 (X = Br/Cl) NCs exhibit slower ultrafast carrier relaxation and longer HC relaxation time compared to pristine NCs. Understanding the charge-carrier relaxation dynamics in CsPbX3 (X = Br/Cl) NCs can aid in the design of efficient optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Aarti Devi, Harshita Seksaria, Dipankar Bain, Sarita Kolay, Rashi, Abir De Sarkar, Amitava Patra
Summary: In this study, gold-copper bimetallic nanoclusters (AuCu NCs) were synthesized using a one-step co-reduction method. The emission wavelength of the NCs was tuned from 520 nm to 620 nm by changing the [Cu2+]/[Au3+] molar ratio. The quantum yield increased from 6% to 13% upon incorporation of Cu atoms. The composition of the Au NCs was determined to be Au-6(MPA)(5), while the bimetallic nanocluster was Au4Cu2(MPA)(5).
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Sarita Kolay, Subarna Maity, Sikta Chakraborty, Srijon Ghosh, Amitava Patra
Summary: This study reveals the influence of substituent groups on the relaxation dynamics of atomically precise Ag-44(SR)(30)(4-) nanoclusters. It shows that the electronegativity and polarization of surface ligands control the electron-phonon interaction and the population transfer from the core state to the surface state. The analysis of transient absorption spectroscopic data reveals the slower relaxation from the core state to the surface state depending on electronegativity and provides insights into the excited-state decay times of Ag-44 nanoclusters.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Kritiman Marjit, Anita Gemmy Francis, Swapan K. Pati, Amitava Patra
Summary: This study investigates the significance of dielectric confinements and exciton binding energy in controlling the carrier relaxation dynamics of hybrid layered perovskites (LPs). It is found that LPs with larger dielectric confinement and higher exciton binding energy exhibit faster carrier relaxation dynamics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
