**Nanomaterials for Improved Direct Electron Transfer-Type Bioelectrocatalysis of Redox Enzymes**

#### **Hongqi Xia 1,2 and Jiwu Zeng 1,2, \***


Received: 27 October 2020; Accepted: 4 December 2020; Published: 10 December 2020

**Abstract:** Interfacial electron transfer between redox enzymes and electrodes is a key step for enzymatic bioelectrocatalysis in various bioelectrochemical devices. Although the use of carbon nanomaterials enables an increasing number of redox enzymes to carry out bioelectrocatalysis involving direct electron transfer (DET), the role of carbon nanomaterials in interfacial electron transfer remains unclear. Based on the recent progress reported in the literature, in this mini review, the significance of carbon nanomaterials on DET-type bioelectrocatalysis is discussed. Strategies for the oriented immobilization of redox enzymes in rationally modified carbon nanomaterials are also summarized and discussed. Furthermore, techniques to probe redox enzymes in carbon nanomaterials are introduced.

**Keywords:** direct electron transfer; bioelectrocatalysis; orientation; carbon nanomaterials; surface modification
