Title

Amendment of palladium nanocubes with iron oxide nanowires for boosted formic acid electro−oxidation

Author's Department

Physics Department

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https://pdf.sciencedirectassets.com/278663/1-s2.0-S1878535222X00130/1-s2.0-S1878535222008401/main.pdf?X-Amz-Security-Token=IQoJb3JpZ2luX2VjEEkaCXVzLWVhc3QtMSJGMEQCIFmlJhKF5xdDTxYzmUO2AmwN%2F5XUgIDEZyuvrkqGYuI4AiAm1vthVGjjt1CI%2BjKP11AuKD3WDLgUE4F0Ci1Vq1vB%2Fiq8BQjy%2F%2F%2F%2F%2F%2F%2F%2F%2F%2F8BEAUaDDA1OTAwMzU0Njg2NSIMbRbkGmVWV5N9QJIsKpAFXDPz3Th24s%2B34jWQ%2BI%2FzYVxeGxiH7isJ%2F3zNfp8IqN1%2FVSs4ZfGDcPq7yWOGVXUSg3CGQLtYAyX%2BijoMFpXQirykPHmQNAA2DK3NkUf2qHDcogreBt7%2BhUPmzwYqtrc13Qlx%2BihepaAebbjP1VW9FJSPHFexrcyLdHqpJcCW96FeKLpwlMJP3AJ4RgBVFrY7XXZ27YVpUQIby7LkxsZ7uvHBgmjy4HiyS%2BR406tSv472A9hlXskhBT0WCzTesh9uWOQwrVKkIkFEdbP2ywvbsgs6eJ1QeobPrC2BmZRaS5yLxHWvUk8qQUHKBiJ10KbwaTszwrLAE%2BDf5FNwYHLuHfHLdsanJ6yImazrpDxThaJbqAweDFQ1miwCTEOYHaoqB0xLlSRIpb6RCUytoX5AYzy%2B21oCTaKETUuv0XtOhnf012oFBVlmMcrStfFmKXIlqAlk%2BvmvF208taDAm03SUDRz1Cv0SfjDvvQWtawUgdpJjS6iWHORtFTxZgF4FDqw424RC6yZpwN%2FlBjOhS1%2B5Ka%2FiWaoBYofThXqFmGQaRg%2BqZ8gMTwFVORrQ3RmvGRx9YdMTM7pliMtwgmq9xPhjoMpZw5CLE%2F3YNDO62HHeEtFZbe%2F8eKBUnFAKF2NOCsbQ%2FBVGHlLrg8e8JUes5w5uAM5XkVV%2Bwy3pmRcadYWru%2BTfYjYYHNRgqlgib6%2BdQ%2B25Bcd0U4Gf%2FD8tR1MbuIveYMBlhWCfDo1hTN7gwJ7qAKdPqXkSqk%2Fdq0RRJ0omZXn1I8iqnM2%2FK%2Fi1y2C0uEwsXAUALms6VQs6j5bxGwptXFKVzsmV6gzS8ReMAaTP7YCWbzh%2FLmUYRyGyU%2BBbkpAoVgRR1nJhYghAy2fTfm5ctww%2FI%2BToAY6sgFWsi39baeZGiDgyJiHlBuK%2F0ZV0CQQ69bkPQCThAW2OQ7Mss7DgCBKbHoegaBE5VBmzS%2B2lDhrhQaEv5jHYQcxkbEsSqm3VmPnLiFxfu%2FPdUQNQ2SiIooDtAhKXZt0cX2GcWy%2ByofhOBcu7jD8auIQfznpOMW4QxS9uFULCF%2FZwRbzz4u2di9qUUDCIF8p6wLIY0LZKPMK1b2vblSkntRTcrWRX7Yxikd8qi%2FhgLLQHvGt&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20230305T181309Z&X-Amz-SignedHeaders=host&X-Amz-Expires=300&X-Amz-Credential=ASIAQ3PHCVTYSEK427KA%2F20230305%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=696246d596f97310d6d509775606b874c595468b352773ea03c72980f5d5e98c&hash=61976e293eae75394e740f605cbe9687612347f85ee95751215a8648fa84f48b&host=68042c943591013ac2b2430a89b270f6af2c76d8dfd086a07176afe7c76c2c61&pii=S1878535222008401&tid=spdf-73450315-4f4b-4127-8b07-a7961a69d309&sid=219e86eb719d8541a08bf510df1f091efa42gxrqb&type=client&tsoh=d3d3LnNjaWVuY2VkaXJlY3QuY29t&ua=030258045d5650550500&rr=7a3454cd9f7e0c3e&cc=eg

All Authors

Heba H. Farrag , Islam M. Al-Akraa, Nageh K. Allam, Ahmad M. Mohammad

Document Type

Research Article

Publication Title

Arabian Journal of Chemistry

Publication Date

Spring 3-1-2023

doi

https://doi.org/10.1016/j.arabjc.2022.104524

Abstract

To quickly move the formic acid (FA) fuel cells closer to a real commercialization, an inexpensive, efficient, and durable electrocatalyst for the direct FA electro-oxidation (FAEO) was developed. This involved a sequential modification of a glassy carbon (GC) substrate with palladium nanocubes (ca. 70 nm, nano-Pd) and iron oxide nanowires (nano-FeOx, ca. 40 nm and 150 nm in average diameter and length, respectively). The deposition sequence and loading level of nano-FeOx in the catalyst were optimized to minimize the catalyst's poisoning with CO that might probably release from a parallel dehydration of FA or from CO2 reduction. Surprisingly, the FeOx/Pd/GC catalyst exhibited a high (21.6 mA cm−2) specific activity for FAEO, which denoted ca. 7 times that of the “pristine” Pd/GC catalyst. This was synchronized with a better (up to fivefold increase in turnover frequency) “long-termed” stability that extended for 90 min of continuous electrolysis at room temperature. A successful effort was dedicated to improving more the catalyst's stability by activating the catalyst electrochemically at –0.5 V vs Ag/AgCl/KCl (sat.) in 0.2 mol L−1 NaOH. The CO stripping agreed perfectly with the impedance analysis in appending the observed enhancement in the catalytic efficiency of FAEO to a favorable electronic modulation at the Pd surface that boosted the oxidative desorption of poisoning CO species at a lower potential.

First Page

1

Last Page

13

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