A Comprehensive Guide to the Differences and Uses of Graphite Oxide and Graphene Oxide

Experienced graphite processors know that while the names graphite oxide and graphene oxide sound similar, they are vastly different. You might order graphene oxide, only to receive a pile of yellow powder – it's indistinguishable from other materials, yet the test report lists it as GO (Good Oxide). Even more absurdly, some factories use the two names interchangeably, specifying graphite oxide in contracts but accepting work according to graphene oxide standards, leading to endless disputes. Today, we'll clarify this distinction, so you won't be confused about procurement, production, or accounting anymore.

A Single Sentence to Understand the Essential Difference.

Start with the core point: graphite oxide is a "stack of paper," while graphene oxide is a "single sheet pulled from that stack." Graphite oxide is a product of graphite treated with strong acids and oxidizing agents. Its carbon-to-oxygen ratio is approximately 2.1 to 2.9, retaining its layered structure, but the interlayer spacing expands from the original 0.335 nanometers to about 0.7 nanometers. The layers are filled with oxygen-containing functional groups such as hydroxyl, epoxy, and carboxyl groups. It appears as yellow or brown powdery particles, stacked in multiple layers.

Graphene oxide, on the other hand, is produced by scattering this stack of paper in water and tearing it apart using ultrasound or high-shear stirring into single-layer or multi-layer thin sheets. Each layer is approximately 1.1 nanometers thick, with functional groups coated on both sides, allowing it to disperse stably in water, forming a colloidal solution. Therefore, essentially, graphite oxide is a raw material, while graphene oxide is a processed product; they are not substitutes but rather upstream and downstream products.

How are they produced, and what are the differences?

There are three main methods for preparing graphite oxide. The Brodie process, using potassium chlorate and concentrated nitric acid, dates back to 1859, but the reaction takes 50-60 hours and produces chlorine gas, posing significant environmental risks, and is now largely obsolete. The Staudenmaier process adds concentrated sulfuric acid, resulting in stronger oxidation, but it also has a long reaction cycle and produces more toxic gases, typically requiring over 56 hours to remove the characteristic peaks of graphite. Currently, the mainstream method is the Hummers process, using concentrated sulfuric acid and potassium permanganate. Later, an improved version was developed, achieving a one-step reaction at medium temperature, resulting in faster reaction, higher oxidation levels, and fewer product defects.

However, a crucial parameter must be closely monitored: the temperature when adding potassium permanganate must not exceed 65 degrees Celsius. Exceeding this limit directly breaks down the carbon skeleton, resulting in numerous defects in the subsequently reduced graphene, with the ID/IG ratio soaring above 0.75, essentially rendering the material unusable. Zhengzhou Jingguo Graphite Co., Ltd. has also entered the graphite-related product market. In actual production, they select processes based on downstream demand. For battery materials, they tend to modify the Hummers process, while for desalination membranes, which require high purity, they may add several washing processes to remove manganese ions.

Each material does its own job, with completely different applications.

These two materials are not substitutes for each other; they each serve different purposes. Graphite oxide has relatively traditional uses: as a depolarizer in dry-cell batteries, added to expanded graphite to reduce cracking in thick products, and used to prepare graphite interlayer compounds. However, its largest application is in wastewater treatment. The oxygen-containing functional groups on the sheets have a strong adsorption capacity for heavy metal ions and organic dyes. Data shows that aluminum-based graphite oxide composites can adsorb up to 400 mg/g of methyl orange, even more potent than activated carbon, and it can even be used in acidic wastewater with a pH less than 2—a feat that bentonite and activated carbon cannot match.

The applications of graphene oxide are much broader: in composite materials, adding it to polymers can improve mechanical and electrical properties; in sensors, its large surface area and unique electronic structure alter conductivity upon adsorption of gas molecules; in hydrogen storage materials, theoretical calculations show that a single layer of graphene can adsorb up to 717% of its molecular weight; and it can be used as a transparent electrode to replace ITO, and as an electrode in supercapacitors. The latest development in 2026 is that a team has already produced graphene oxide films that can be programmed to fold into shapes, like moving origami, paving the way for flexible robots and smart wearables.

How to choose when purchasing: Remember these points

Finally, some practical purchasing tips. When buying graphene oxide, focus on the carbon-to-oxygen ratio, generally between 2.1 and 2.9. Also test its dispersibility; take a small amount, put it in water, stir, and only those that form a uniform brownish-yellow colloid and do not quickly settle upon standing are considered合格 (qualified). When buying graphene oxide, besides looking at the carbon-to-oxygen ratio, you also need to ask about the peeling rate. Not all graphene oxide can be peeled into single layers; those with too low an oxidation level are simply impossible to tear, and sheets from improperly dried graphene are welded together, no matter how much ultrasonic treatment is used. Furthermore, while graphene oxide itself is an insulator, the conductivity of graphene oxide changes due to its layered structure. This parameter is crucial for electronic device manufacturing. Remember this: graphene oxide is the raw material, while graphene oxide is a processed product. Understanding this chain will help you navigate procurement more effectively and avoid pitfalls in production.