General synthesis of single atom electrocatalysts: via a facile condensation-carbonization process

Chen, Weiming; Luo, Xuanli; Slater, Thomas J.A.; Ling, Sanliang; Zhou, Yongfang; Bao, Rui; Alves Fernandes, Jesum; Wang, Jianshe; Shen, Yi

Abstract

The general and cost-effective synthesis of single atom electrocatalysts (SAECs) still remains a great challenge. Herein, we report a general synthetic protocol for the synthesis of SAECs via a simple condensation-carbonization process, in which furfural and cyanamide were condensation polymerized in the presence of polystyrene nanospheres and metal ions, followed by a pyrolysis to N-doped carbon nanosheet (NCNS) supported SAECs. Six types of SAECs containing platinum, palladium, gold, nickel, cobalt and iron were synthesized to demonstrate the generality of the synthesis protocol. This methodology affords a facile solution to the trade-off between support conductivity and metal loading of SAECs by optimizing the ratio of carbon/nitrogen precursors, i.e., furfural and cyanamide. The presence of single metal atoms was confirmed by high-angle annular dark field scanning transmission electron microscopy and X-ray absorption fine structure measurements. The three-dimensional distribution of single platinum atoms was vividly revealed by depth profile analysis using a scanning transmission electron microscope. The resulting SAECs showed excellent performance for glycerol electro-oxidation and water splitting in alkaline solutions. Notably, Pt/NCNSs possessed an unprecedent mass-normalized current density of 5.3 A per milligram of platinum, which is 32 times that of the commercial Pt/C catalyst. Density functional theory calculations were conducted to reveal the adsorption behavior of glycerol over the SAECs. Using Ni/NCNSs and Co/NCNSs as anodic and cathodic electrocatalysts, we constructed a solar panel powered electrolytic cell for overall water splitting, leading to an overall energy efficiency of 8.8%, which is among the largest solar-to-hydrogen conversion efficiencies reported in the literature. This journal is

Citation

Chen, W., Luo, X., Slater, T. . J., Ling, S., Zhou, Y., Bao, R., …Shen, Y. (2020). General synthesis of single atom electrocatalysts: via a facile condensation-carbonization process. Journal of Materials Chemistry A, 8(48), 25959-25969. https://doi.org/10.1039/d0ta08115a

• Journal Article Type: Article
• Acceptance Date: Nov 19, 2020
• Online Publication Date: Nov 20, 2020
• Publication Date: Dec 28, 2020
• Deposit Date: Nov 25, 2020
• Publicly Available Date: Nov 21, 2021
• Journal: Journal of Materials Chemistry A
• Print ISSN: 2050-7488
• Electronic ISSN: 2050-7496
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 48
• Pages: 25959-25969
• DOI: https://doi.org/10.1039/d0ta08115a
• Keywords: Renewable Energy, Sustainability and the Environment; General Materials Science; General Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/5069366
• Publisher URL: https://pubs.rsc.org/en/Content/ArticleLanding/2020/TA/D0TA08115A#!divAbstract
• Additional Information: : This document is Similarity Check deposited; : Supplementary Information; : Single-blind; : Received 18 August 2020; Accepted 19 November 2020; Accepted Manuscript published 20 November 2020