Reversely trapping atoms from a perovskite surface for high-performance and durable fuel cell cathodes

Zhuang

Advanced Energy Materials

et al. 2022

Self Cite

107

overcome the thermodynamic and kinetic stability of CO 2 molecules. [9][10][11] Various products, including CO, formic acid, and C 2+ products, have been achieved. [12][13][14] However, their catalytic efficiency and product selectivity for practical application are still limited by the large overpotential and undesirable competition of the hydrogen evolution reaction (HER). [15][16][17][18] Therefore, it is urgent to accurately control electrocatalysts at the atomic scale to break the inherent scaling relationship for the CO 2 RR.Recently, transition metal single-atom catalysts (SACs) have attracted tremendous attention for the CO 2 RR due to their sufficient atom utilization efficiency and desirable electronic states. [19][20][21] Ni single atom (SA) supported on graphene demonstrates good performance for CO 2 reduction to CO; however, it also suffers from a high onset potential due to the weak binding strengths of the intermediates at the Ni-N-C sites, leading to a high energy barrier to form *COOH intermediates. [22,23] Fe SA exhibits a low onset potential for the CO 2 RR, but unfortunately, the strong binding of *CO at the Fe sites seriously lowers the Faraday efficiency (FE) and stability. [24][25][26][27] Therefore, balancing the adsorption strength for both *COOH and *CO intermediates on only one kind of single metal site is a great challenge. It has been reported that dual-single-atom (DSA) catalysts with substantially different coordination environments and quantum size effects have the potential to surpass the well-established SACs for the CO 2 RR. [28][29][30][31][32] However, insufficient theory-designed DSA catalysts impede the development of DSA catalysts with specific catalytic activity. [31] Furthermore, the understanding regarding the mechanism for the enhanced catalytic process lacks in-depth research both experimentally and theoretically. [32] Most of the reported DACs have primarily focused on the thermodynamic pathway, for example, the Gibbs free energy, while the electron interactions between dual atoms and the kinetic pathway are equally indispensable for obtaining a thorough comprehension of this enhanced CO 2 RR process. [33][34][35][36][37] Therefore, the rational design of high-performance DSA remains conceptually challenging, and the electronic variation of each metal site during the CO 2 RR process has yet to be explored.Herein, we design a DSA catalyst consisting of atomically dispersed Cu and Ni bimetal sites, and the electronegativity offset between the Cu and neighboring Ni atoms significantly Achieving efficient efficiency and selectivity for the electroreduction of CO 2 to value-added feedstocks has been challenging, due to the thermodynamic stability of CO 2 molecules and the competing hydrogen evolution reaction. Herein, a dual-single-atom catalyst consisting of atomically dispersed CuN 4 and NiN 4 bimetal sites is synthesized with electrospun carbon nanofibers (CuNi-DSA/CNFs). Theoretical and experimental studies reveal the strong electron interactions induced by the electro...

mentioning

confidence: 99%

Interatomic Electronegativity Offset Dictates Selectivity When Catalyzing the CO₂ Reduction Reaction

Zhuang

Advanced Energy Materials

et al. 2022

Self Cite

107

“…At a potential of U = 0 V, the four continuous steps are all downhill, meaning that the reaction is spontaneous. The rate-determining step is usually accompanied by a small free energy drop [78]. According to the free energy diagram, the third step (O* → OH*) is the main obstacle to the ORR activity for pure NC, as it shows the smallest free energy drop.…”

Section: Resultsmentioning

confidence: 99%

Improving the electrophilicity of nitrogen on nitrogen-doped carbon triggers oxygen reduction by introducing covalent vanadium nitride

Zhuang

Xia

et al. 2022

Sci. China Mater.

Self Cite

Nitrogen-doped carbon (NC) demonstrates great promise as an alternative electrocatalyst for the oxygen reduction reaction (ORR). The C atoms next to the N dopant have been identified as the exact active sites, and optimizing the electronic structure of N has a great effect on the activity. In this study, a novel VN@NC nanocomposite consisting of a vanadium nitride (VN) nanoparticle core and chainmail-like NC shell has been constructed via a simple physical mixing and annealing process. Benefiting from the unique core@shell nanowire structure and modulated electronic structure, the asprepared VN@NC manifests an obviously promoted ORR activity (onset potential: 0.93 V) compared with pure NC and bulk VN. Specifically, incorporating VN induces charge transfer from N on NC to V in VN and increases the electrophilicity of N on NC, resulting in optimized adsorption to Ocontaining intermediates. VN@NC also manifests decent long-term stability (89% current density retention after a 40,000-s test). This finding highlights the significance of regulating the electronic structure of N in NC and provides a reliable strategy for constructing NC-based hybrid electrocatalysts.

Front. Bioeng. Biotechnol.

“…Recently, nanomaterials have been extensively applied in life science, energy science and other fields (Xu et al, 2019;Zhuang et al, 2019;Kuang et al, 2020;Wen et al, 2020;Chen et al, 2021;He et al, 2021;Liu et al, 2021;Savchenko et al, 2021;Schultz et al, 2021;Wu et al, 2021;Xu and Liu, 2021;He et al, 2022;Yi et al, 2022;Zhuang et al, 2022). At present, nanomaterials in electrochemical biosensors have also been broadly concerned for gauging SARS-COV-2.…”

Section: Specific Detection Of Sars-cov-2 Nucleic Acidmentioning

confidence: 99%

Recent Progresses in Electrochemical DNA Biosensors for SARS-CoV-2 Detection

Mei

Lin

et al. 2022

Coronavirus disease 19 (COVID-19) is still a major public health concern in many nations today. COVID-19 transmission is now controlled mostly through early discovery, isolation, and therapy. Because of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the contributing factor to COVID-19, establishing timely, sensitive, accurate, simple, and budget detection technologies for the SARS-CoV-2 is urgent for epidemic prevention. Recently, several electrochemical DNA biosensors have been developed for the rapid monitoring and detection of SARS-CoV-2. This mini-review examines the latest improvements in the detection of SARS-COV-2 utilizing electrochemical DNA biosensors. Meanwhile, this mini-review summarizes the problems faced by the existing assays and puts an outlook on future trends in the development of new assays for SARS-CoV-2, to provide researchers with a borrowing role in the generation of different assays.