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Patowary S, Chetry R, Goswami C, Chutia B, Bharali P. Oxygen Reduction Reaction Catalyzed by Supported Nanoparticles: Advancements and Challenges. ChemCatChem 2021. [DOI: 10.1002/cctc.202101472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Suranjana Patowary
- Tezpur University Chemical Sciences Department of Chemical SciencesNapaamTezpur 784028 Tezpur INDIA
| | - Rashmi Chetry
- Tezpur University Chemical Sciences Department of Chemical SciencesTezpur UniversityNapaamSonitpur 784028 Sonitpur INDIA
| | - Chiranjita Goswami
- Tezpur University Chemical Sciences Department of Chemical SciencesNapaamTezpur 784028 Tezpur INDIA
| | - Bhugendra Chutia
- Tezpur University Chemical Sciences Department of Chemical SciencesTezpur UniversityNapaamSonitpur 784028 Sonitpur INDIA
| | - Pankaj Bharali
- Tezpur University Chemical Sciences NapaamIndia 784028 Tezpur INDIA
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Goswami C, Saikia H, Jyoti Borah B, Jyoti Kalita M, Tada K, Tanaka S, Bharali P. Boosting the electrocatalytic activity of Pd/C by Cu alloying: Insight on Pd/Cu composition and reaction pathway. J Colloid Interface Sci 2021; 587:446-456. [PMID: 33383434 DOI: 10.1016/j.jcis.2020.11.104] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 11/22/2020] [Accepted: 11/26/2020] [Indexed: 10/22/2022]
Abstract
Tuning composition of Pd-based bimetallic electrocatalysts of high stability and durability is of great importance in energy-related reactions. This study reports the remarkable electrocatalytic performance of carbon-supported bimetallic Pd-Cu alloy nanoparticles (NPs) towards formic acid oxidation (FAO) and oxygen reduction reaction (ORR). Among various bimetallic compositions, Pd3Cu/C alloy NPs exhibits the best FAO and ORR activity. During FAO reaction, Pd3Cu/C alloy NPs exhibits a peak with a current density of 28.33 mA cm-2 and a potential of 0.2 V (vs. Ag/AgCl) which is higher than that of the other PdCu compositions and standard 20 wt% Pd/C catalyst. Meanwhile, the onset potential (-0.09 V), half-wave potential (-0.18 V), limiting current density at 1600 rpm (-4.9 mA cm-2) and Tafel slope (64 mV dec-1) values of Pd3Cu/C alloy NPs validate its superiority over the conventional 20 wt% Pt/C catalyst for ORR. Experimental and DFT studies have confirmed that the enhanced activity can be attributed to the electronic effect that arises after Cu alloying which causes a downshift of Pd d-band center and structural effect that produces highly dispersed NPs over the carbon matrix with high electrochemically active surface area.
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Affiliation(s)
- Chiranjita Goswami
- Department of Chemical Sciences, Tezpur University, Tezpur, Napaam 784 028, Assam, India
| | - Himadri Saikia
- Department of Chemical Sciences, Tezpur University, Tezpur, Napaam 784 028, Assam, India; Materials Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat 785 006, Assam, India
| | - Biraj Jyoti Borah
- Department of Chemical Sciences, Tezpur University, Tezpur, Napaam 784 028, Assam, India
| | - Manash Jyoti Kalita
- Department of Chemical Sciences, Tezpur University, Tezpur, Napaam 784 028, Assam, India
| | - Kohei Tada
- Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Japan
| | - Shingo Tanaka
- Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Japan
| | - Pankaj Bharali
- Department of Chemical Sciences, Tezpur University, Tezpur, Napaam 784 028, Assam, India.
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Goswami C, Yamada Y, Matus EV, Ismagilov IZ, Kerzhentsev M, Bharali P. Elucidating the Role of Oxide-Oxide/Carbon Interfaces of CuO x-CeO 2/C in Boosting Electrocatalytic Performance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:15141-15152. [PMID: 33256414 DOI: 10.1021/acs.langmuir.0c02754] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Herein, we report the synthesis and bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities of a CuOx-CeO2/C electrocatalyst (EC) with rich oxide-oxide and oxide-carbon interfaces. It not only demonstrates a smaller Tafel slope (65 mV dec-1) and higher limiting current density (-5.03 mA cm-2) but also exhibits an onset potential (-0.10 V vs Ag/AgCl) comparable to that of benchmark Pt/C. Besides undergoing the favorable direct four-electron ORR pathway, it unveils a loss of 23% of its initial current after 6 h of a stability test and a negative shift of 4 mV in the half-wave potential after the accelerated durability test compared to the corresponding current loss of 28% and negative shift of 20 mV for Pt/C. It also reveals remarkable OER activity in an alkaline medium with a low onset potential (0.20 V) and a smaller Tafel slope (177 mV dec-1). The bifunctional ORR/OER activity of CuOx-CeO2/C EC can be ascribed to the synergistic effects, its unique structure with enriched oxygen vacancies owing to the presence of Ce4+/Ce3+, robust oxide-oxide and oxide-carbon heterointerfaces, and homogeneous dispersion of oxides over the carbon bed, which facilitates faster electronic conduction.
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Affiliation(s)
- Chiranjita Goswami
- Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784 028, Assam, India
| | - Yusuke Yamada
- Department of Applied Chemistry & Bioengineering, Graduate School of Engineering, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Ekaterina V Matus
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Ilyas Z Ismagilov
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Mikhail Kerzhentsev
- Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Pankaj Bharali
- Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784 028, Assam, India
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