Facile, Room Temperature, Electroless Deposited (Fe1−x, Mnx)OOH Nanosheets as Advanced Catalysts: The Role of Mn Incorporation. Issue 30 (2nd July 2018)

• Record Type: Journal Article
• Authors: Suryawanshi, Mahesh P.; Ghorpade, Uma V.; Shin, Seung Wook; Suryawanshi, Umesh P.; Shim, Hong Jae; Kang, Soon Hyung; Kim, Jin Hyeok
• Is Part Of: Small. Volume 14:Issue 30(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-07-02
• Subjects: facile room temperature electroless deposition -- (Fe1−x, Mnx)OOH (FeMnOOH) -- nanosheets -- oxygen evolution catalysts -- photo‐electrochemical water splitting; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201801226
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Herein, bimetallic iron (Fe)–manganese (Mn) oxyhydroxide ((Fe1− x, Mn x )OOH, FeMnOOH) nanosheets on fluorine‐doped tin oxide conducting substrates and on semiconductor photoanodes are synthesized by a facile, room temperature, electroless deposition method as catalysts for both electrochemical and photo‐electrochemical (PEC) water splitting, respectively. Surprisingly, Mn‐doped FeOOH can significantly modulate the nanosheet morphology to increase the active surface area, boost more active sites, and augment the intrinsic activity by tuning the electronic structure of FeOOH. Due to the 2D nanosheet architecture, the optimized FeMnOOH exhibits superior electrochemical activity and outstanding durability for the oxygen evolution reaction with a low overpotential of 246 mV at 10 mA cm −2 and 414 mV at 100 mA cm −2, and long‐term stability for 40 h without decay, which is comparable to the best electrocatalysts for water oxidation reported in the literature. By integrating with semiconductor photoanodes (such as α‐Fe2 O3 nanorod (NR) arrays), bimetallic FeMnOOH catalysts achieve solar‐driven water splitting with a significantly enhanced PEC performance (3.36 mA cm −2 at 1.23 V vs reversible hydrogen electrode (RHE)) with outstanding long‐term stability (≈8 h) compared to that of the bare Fe2 O3 NR (0.92 mA cm −2 at 1.23 V vs RHE). Abstract : An advanced (Fe1− x, Mn x )OOH nanosheet electrocatalyst : facile, room‐temperature, electroless deposited (Fe1− x, Mn x )OOH nanosheets are demonstrated as promising catalysts toward efficient and durable water oxidation. The significantly lower overpotential of 246 mV at 10 mA cm −2 and durability over 40 h for FeMnOOH oxygen evolution catalyst and a photocurrent density of 3.36 mA cm −2 at 1.23 V (vs RHE) for Fe2 O3 /FeMnOOH are remarkable.