TY - JOUR
T1 - MOF-derived 3D MnO2@graphene/CNT and Ag@graphene/CNT hybrid electrode materials for dual-ion selective pseudocapacitive deionization
AU - Rangaraj, Vengatesan M.
AU - Yoo, Jae In
AU - Song, Jang Kun
AU - Mittal, Vikas
N1 - Funding Information:
Dr. V.M.R. and Dr. V.M. sincerely thank Khalifa University for the financial support through the Internal research grant ( FSU-2020-34 ). Prof. J-K.S thanks the financial support by the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT, and Future Planning ( NRF-2022R1A4A1028702 , and IITP-2020-0-01821 ). The authors thank Mr. Rajavel and Dr. Dennyson (Sunchon National University, South Korea) for the fruitful discussion of this work. Also, the authors acknowledge Dr. Suresh Kumar Reddy and Dr. Thanigaivelan (Khalifa University, Abu Dhabi,UAE) for the analytical support of this work.
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/3/15
Y1 - 2023/3/15
N2 - In the present study, an asymmetric pseudocapacitive deionization (PCDI) system was fabricated using redox-active electrode materials of three-dimensional (3D) MnO2@graphene/CNT (MGC) and Ag@graphene/CNT (AGC) as cathode and anode, respectively. The asymmetric PCDI system owns a dual-ion capture mechanism, resulting in a high desalination capacity. The 3D MGC and AGC active electrode materials have been derived through a facile two-step method. Initially, the Mn-BTC and Ag-BTC were in situ grown on the 3D r-GO/CNT structure through a hydrothermal process, yielding Mn-BTC@r-GO/CNT and Ag-BTC@r-GO/CNT hybrids. Subsequently, high-temperature annealing of these hybrids leads to respective MGC and AGC hybrid nanocomposites. Powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analysis facilities were used to investigate the structure and morphology of the as-prepared hybrid nanocomposites. The as-derived 3D MGC and AGC electrode materials exhibit the high specific capacitance of 496.4 and 206.6 F g−1, respectively, at 1 A g−1 using a 1 M NaCl solution. Furthermore, the MGC (cathode)//AGC (anode) electrode pairs-based PCDI system exhibits remarkable desalination performance with a high salt adsorption capacity of 62.4 mg g−1 and a charge efficiency of 95 % in 1000 ppm NaCl solution at 1.2 V.
AB - In the present study, an asymmetric pseudocapacitive deionization (PCDI) system was fabricated using redox-active electrode materials of three-dimensional (3D) MnO2@graphene/CNT (MGC) and Ag@graphene/CNT (AGC) as cathode and anode, respectively. The asymmetric PCDI system owns a dual-ion capture mechanism, resulting in a high desalination capacity. The 3D MGC and AGC active electrode materials have been derived through a facile two-step method. Initially, the Mn-BTC and Ag-BTC were in situ grown on the 3D r-GO/CNT structure through a hydrothermal process, yielding Mn-BTC@r-GO/CNT and Ag-BTC@r-GO/CNT hybrids. Subsequently, high-temperature annealing of these hybrids leads to respective MGC and AGC hybrid nanocomposites. Powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analysis facilities were used to investigate the structure and morphology of the as-prepared hybrid nanocomposites. The as-derived 3D MGC and AGC electrode materials exhibit the high specific capacitance of 496.4 and 206.6 F g−1, respectively, at 1 A g−1 using a 1 M NaCl solution. Furthermore, the MGC (cathode)//AGC (anode) electrode pairs-based PCDI system exhibits remarkable desalination performance with a high salt adsorption capacity of 62.4 mg g−1 and a charge efficiency of 95 % in 1000 ppm NaCl solution at 1.2 V.
KW - Capacitive deionization
KW - Dual-ions adsorption
KW - Graphene/CNT structure
KW - Pseudocapacitance
KW - Redox-active materials
UR - http://www.scopus.com/inward/record.url?scp=85146066995&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2023.116369
DO - 10.1016/j.desal.2023.116369
M3 - Article
AN - SCOPUS:85146066995
SN - 0011-9164
VL - 550
JO - Desalination
JF - Desalination
M1 - 116369
ER -