Shewanella oneidensis MR-1 self-assembled Pd-cells-rGO conductive composite for enhancing electrocatalysis
文献类型：期刊论文
| 作者 | Hou, Ya-Nan; Sun, Su-Yun; Yang, Zhen-Ni; Yun, Hui; Zhu, Ting-ting ; Ma, Jin-Feng; Han, Jing-Long; Wang, Ai-Jie; Cheng, Hao-Yi
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| 刊名 | ENVIRONMENTAL RESEARCH
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| 出版日期 | 2020-05 |
| 卷号 | 184页码:1-8 |
| 关键词 | Shewanella oneidensis MR-1 Biogenic palladium Graphene composite Self-assembly Electrocatalytic activity |
| ISSN号 | 0013-9351 |
| 英文摘要 | Biosynthesized noble metal nanoparticles (NPs) as promising green catalysts for electrochemical application has invited a lot of attention. However, effective electron transfer between biosynthesized NPs and electrode remains a challenge due to the uncontrollable and poor conducive property of cell substrates. In this study, graphene oxide (GO) was introduced into a bio-Pd synthesis process governed by Shewanella oneidensis MR-1, which was demonstrated to be simultaneously reduced with Pd(II) and transformed to reduced GO (rGO), resulting in the formation of a Pd-cells-rGO composite. Compared to the control without rGO (Pd-cells), the electrochemical conductivity of Pd-cells-rGO composite increased from almost zero to 196 mu S cm(-1), indicating the rGO facilities the electron transport across the composite. Electrochemical characterizations revealed the electrochemical active surface area (ECSA) of Pd in Pd-cells-rGO was enlarged by increasing the amount of rGO in the composite, clearly indicating that the conducive network created by rGO enable the Pd NPs receive electrons from electrode and become electrochemical active. A considerable enhancement of electrocatalytic activity was further confirmed for Pd-cells-rGO as indicated by 36.7- and 17.2-fold increase (Pd-cells-rGO with Pd/GO ratio of 5/1 vs Pd-cells) of steady state current density toward hydrogen evolution and nitrobenzene reduction at -0.7 V and -0.55 V vs Ag/AgCl, respectively. We also compared the electrocatalytic performance with MWCNTs hybrids Pd-cells-CNTs. It was found that the association of Pd, cells and rGO creates an interactive and synergistic environment to allow higher conductivity and catalytic activity under the same amount of carbon nanomaterial. The strategy developed in this work activates a highly reactive NPs and proposed a designable protocol for enhancing electrocatalytic activity of biocatalysts. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45212]  |
| 专题 | 生态环境研究中心_中国科学院环境生物技术重点实验室 |
| 推荐引用方式 GB/T 7714 | Hou, Ya-Nan,Sun, Su-Yun,Yang, Zhen-Ni,et al. Shewanella oneidensis MR-1 self-assembled Pd-cells-rGO conductive composite for enhancing electrocatalysis[J]. ENVIRONMENTAL RESEARCH,2020,184:1-8. |
| APA | Hou, Ya-Nan.,Sun, Su-Yun.,Yang, Zhen-Ni.,Yun, Hui.,Zhu, Ting-ting.,...&Cheng, Hao-Yi.(2020).Shewanella oneidensis MR-1 self-assembled Pd-cells-rGO conductive composite for enhancing electrocatalysis.ENVIRONMENTAL RESEARCH,184,1-8. |
| MLA | Hou, Ya-Nan,et al."Shewanella oneidensis MR-1 self-assembled Pd-cells-rGO conductive composite for enhancing electrocatalysis".ENVIRONMENTAL RESEARCH 184(2020):1-8. |
入库方式： OAI收割
来源：生态环境研究中心
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